Wellbrook loop amplifier This loop antenna is sold by major retailers such as DX Engineering, Gigaparts and Chameleon itself – the company is a well-known name in antennas and other equipment for the amateur radio world. Everett N4CY. 450 8. Both models of compact, 1-meter dia. Recently, our local Swap and Shop listed a Wellbrook loop at a reasonable price, so I went for it. 0 Amp-Hour size will operate a loop antenna for many, many hours before needing to be recharged. Identifying Interference: VDSLx bands 11-Aug-17 IVARC Talk –Active Loops DRAFT, M0XGT 18 VDSL Band U0 D1 U1 D2 U2 D3 Frequency MHz 0. One Loop leaning against a wall gives him acceptable reception with the SDRPlay RSP on the ground floor–2nd or 3rd Oct 26, 2024 · Above right, you can see my Active Antenna Amplifier AAA-1C loop from Chavdar, LZ1AQ. We asked him to make some real time comparisons of some popular active loop antenna amplifier designs using real signals to help give people a practical feel for how well they work against that well established favourite – the Wellbrook 1530AN. It is not for aluminum l Mar 9, 2021 · Performs well from LW through HF. io [mailto:CrossCountryWireless@groups. 664 1. Aug 23, 2018 · To save starting a new thread this is my current, if somewhat ugly method for connecting loops to a LZ1AQ amp. . as well as a Bias-T to enable power to be conveyed via the coaxial cable to the loop amplifier. we could build something low pass filtered at 30 mhz, i personally do Sep 10, 2020 · Yes, you do have to do some maintenance on most antennas, and the Wellbrook is one I have to work on every 3 to 5 years. Although still usable down at 540KHz, performance dropped off rapidly as I  · Wellbrook traced-out loop amp schematics uploaded to Photos Steve Ratzlaff. 700 3. The Pixel amplifier was tested by an independent laboratory and certified to meet its published specs and it also exhibited a noise figure in the vicinity of 2 dB (at 10 MHz) which is excellent. A 3rd way of supporting the loop is to use a camera tripod and replace the center post with PVC to hold the Jul 10, 2021 · More recently he’s been exploring amplifier designs for small loop antennas. Note: Wellbrook has ceased operations due to the retirement of the owner. eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. In this introductory video, Mike Harwood shows how an RSPduo enables a real-time comparison of two antennas – in this demo, he uses a Wellbrook 1530AN and one of his own compact loop creations. George Smart M1GEO tried to reverse engineer the circuit used in the popular Wellbrook loop. So far I have tried several transistor combinations. The loop is made from aluminum tubing and an encapsulated amplifier is located at the bottom. Finally, you will find a lot of loop amplifier designs from LZ1AQ. The S4-5 "noise floor" is Description:HamGeek 50KHz-30MHz LNR Loop Pro Active Loop Antenna Amplifier Ultra Low Noise - Wellbrook ALA/FLEX1530LN It is a portable active loop antenna amplifier. I’ve been testing the loop in the garden on the top of a 2M pole for the past few months. Jul 1, 2017 · Subject: Re: [loopantennas] Wellbrook Loop Reverse Engineered ! This is apparently what the Wellbrook amplifier does and is highly desirable in terminating a broadband loop. Jul 5, 2019 #26 I also have very effective RF chokes on the feedline exiting the W8LVP loop amplifier. Yes, the AAA1-C loop amp from LZ1AQ is practically the best opportunity to acquire a diy high-end loop antenna for a decent price. I currently only have 4 on hand, so if interested you need to let me know ASAP. M1GEO disassembled a broken and older version of the amplifier to repair it and has drawn the schematic [6]. 133 0. Jan 23, 2018 · Hence, the input z is a combination of the 200 Ohm MIMICs loaded with two 290 Ohm resistors. Variable Bandwidths (though limited at the high end to 10 kHz), Pre-Amp and Attenuation, and that beautiful color LCD that allows one to see signals. It is installed on a short mast with a Channel Master 9521A rotator. – The Wellbrook FLX1530LN with a 0. Having proved brilliant performance despite its size, I felt tempted to buy one of these new toys. It worked fine using the Wellbrook interface to feed the voltage up to it, and I even used the metal ring of the 1530 as the aerial. However, as the ALA100LN uses a larger loop, then the input power to the amplifier will be higher, But this shouldn't be a problem 3m from a 100W Tx antenna. Kind regards Andrew Ikin Wellbrook Communications-- Typical setup is Phased Array into the left ear piece, Wellbrook Loop into the right. 5 meter I have a CCW Active loop (the triangular, single output, version) about 6m up on a telescopic aluminium mast. It would be fair to say that the Mar 24, 2023 · Wellbrook Communications Loop Antennas. Feb 24, 2017 · Includes low-noise linear AC power adapter to generate clean 12 volts for the loop amplifier. Under severe QRN conditions it might even be better. It is not possible to insert filters between the loop and amplifier. The antenna interface unit also has an amplifier. Just as an aside, I wanted to buy a Wellbrook loop recently, and Second Hand Wellbrook ALA330 Receiving LoopActive Loop Antenna ALA 330S (aluminium)3MHz-30MHz 1. There are SLA batteries larger and smaller in size, but I like these 7 Amp-Hour versions. The schematics of the Wellbrook loop antenna's amplifier are kept secret, for obvious commercial reasons, and the circuit board is potted, to protect it both from the weather and from prying eyes. It's 100 times better than the Wellbrook designed amp, which corrodes and actually has more  · "A new version of the world famous Wellbrook Active Loop ALA1530 50kHz-30MHz 1m dia. e. I used some 1/2 inch PVC pipe as the vertical support. The ALA1530LNPro will only be available outside the UK and the EU. 3. 950 12. Assuming you can afford the more expensive Wellbrook ALA1530LN complete loop and loop amp, I would suggest that would be a much better solution if you want Reviews For: WellBrook ALA100LN-M Medium Aperture Loop (RX) Category: Antennas: VLF/LF/HF Receive only. There should be complete info there for anyone to be able to make their own. At 10kHz it is -16dB, which is still usable. Wewllbrook Retrofit LZ1AQ loop amp. When May 31, 2022 · The Wellbrook loop amp is designed with a much lower input impedance at LF and works much better at LF as well as at MW and HF. This is the second of Mike’s antenna comparison videos.  · I just finished building another batch of 5 Retrofit loop amplifiers for the Wellbrook ALA1530 loop. 42 euros charges included for Europe. With the loop connected, it's very noisy and indicates S4-5. Following the footsteps of the WellBrook and the WellGood in this article, here's my version: 'The WellFlex Magnetic Loop Amp'! Two amplifiers dominate the market for magnetic loop antennas for HAMS and radio amateurs. The interface box LED lights up and puts out on bnc to amplifier 12v but no mA on elecy meter measured in series.  · Wellbrook ALA1530 Loop Replacement amplifier Mark Cayton. Review Summary For : Wellgood Loop Amplifier; Reviews: 1 MSRP: aprox £50. The W6LVP loop amp was designed primarily for HF reception. All Messages By This Member #18596 I still have 2 of the LZ1AQ loop amps that are designed to be a direct replacement for the Wellbrook ALA1530 if anyone is interested. noise floor should be –110dBm in a 1kHz bandwith with the additional gain in the Interface. Back to my weather page Dec 15, 2018 · Slightly more complicated is the Wellgood loop amplifier. It can be used with flexible feed pipe loops in different lengths and of specifications. inside the Antenna Interface. Jul 11, 2021 · We asked him to make some real time comparisons of some popular active loop antenna amplifier designs using real signals to help give people a practical feel for how well they work against that well established favourite – the Wellbrook 1530AN. 75. Wellbrook antennas are the staple magnetic loop antenna for many DXers. hence try flag for lf bands. I was an early customer, have a Wellbrook loop connected to a SDRplay RSP duo HiZ inputSnd the ccw loop to the tuner 2 50 ohm port (using usb power). Yesterday I just finished building another batch of 5 loop amps. I don't have antenna analysis SW, so this will be a 'cut-and-try' approach. The Wellbrook is way overpriced in my opinion, the amplifier is poorly protected from the elements and I wished I'd saved my hard earned money and just bought an MLA-30+. The transmit antenna connections are not used. And it did. 5 feet per side). I am very satisfied the the Wellbrook Medium Apature amp but if I need a second amp I will Dec 3, 2018 · The W6LVP is the only active loop I've tested but the maker has compared to Wellbrook and Pixel and says they all work about the same, whatever that is worth. This amplifier can use two separate small magnetic loops. All Messages By This Member #72183 I've bought a couple of Everett's amps and installed them (at different times) on a homemade 10-foot diameter (10 meter circumference) copper loop and "smoked" both amps, my fault both times - one time was due to transmitting 700 watts into the loop  · Wellbrook ALA1530 Loop Replacement amplifier Mark Cayton. Aluminium Loop----As of April 2021 the amplifier gain has been increased to +28dB. Had some amp-loop screw connection problems for a while, at some point couldn't get it to work Nov 23, 2024 · Review Summary For : Wellgood Loop Amplifier; Reviews: 1 MSRP: aprox £50. The ccw is on an “elderly” run of RG58 whilst the Wellbrook is a “mature” setup. 800 5. The amp. This is due to retirement. Regards Lino SDRPlayer Member. The measured NF using a 2. For those not familiar with how field effect in dBm is related to the usual S-meter readings: Approx. Like some others I find the Wellbrook ALA100LN loop module a real good solution with better results. 8%. Keep in mind that with a loop like this, *the amplifier is only trying to make up for the low signals of the loop*. 2. It is not for aluminum l Sep 18, 2019 · In this review, he compares the MLA to the Wellbrook ALA1530-LF and a 30 foot square ground loop antenna. Buy it now + EUR 4. Brand new | Business. 5 meter diameter loop of RG142 (a stiff “aircraft grade” version of RG58 that holds it shape well at this size). as the ALA1530. Jan 14, 2025 · All of the ones that I can find online have center pin positive outputs (such as the TalentCell 12V/6000mAh rechargeable battery that I’ve purchased to power my other, more recently produced, Wellbrook Oct 4, 2022 · Again, some hard-nosed testing between the Wellbrook, the MLA30+ and the CCW amplifier will follow, with the last two using the exact same copper loop, but that's for another day.  · Good morning, I'm wondering if anyone like me has made a full working Wellbrook 1530 LN amplifier based on the schematic found in the files section named "Wellbrook_Loops. mis-match at MF plus input attenuation in this frequency range. Jun 9, 2021 · My Wellbrook Receiving Loop I put this together about three years ago. It is an useful DX tool when you go out. All Messages By This Member #72183 I've bought a couple of Everett's amps and installed them (at different times) on a homemade 10-foot diameter (10 meter circumference) copper loop and "smoked" both amps, my fault both times - one time was due to transmitting 700 watts into the loop Review Summary For : Wellgood Loop Amplifier; Reviews: 1 MSRP: aprox £50. Aug 31, 2022 · The loop amp itself is a clone of the popular LZ1AQ loop amp, but the transistors used in this one are very noisy. With the new design I can offer it as a stand alone finished board, with bias tee, or mounted in a nice compact box. Kicad_sch. Four of them are sold, but I have 1 left to sell, however, I am in the process of Mar 31, 2024 · Comparing the LZ1AQ loop amplifier with the Wellbrook. The loop amp does not begin to meet the advertised specs. I have some new ideas to improve All comparisons are made with the loop’s amplifier ON, unless notified. Buy it now + EUR 5. The Wellbrook claims to be a magnetic loop, but everything I have ever read about loop designs requires that if they are to work in the truly "magnetic" mode, they need to be brought to resonance, and when a short antenna system (I say system, because all antennas are "systems" that comprise of element, feeder and, if needed, additional Oct 18, 2019 · Loop on Ground Part 2. I use a pair of them, 100 feet apart, for a loop array. 86 postage. In thinking about base-emitter feedback one should also note Van Scoyoc's cross-coupled amplifier deign which was published in 1948 !  · These mainly stem from its mediocre pre-amp design topology. The MLA-30 was Because the Wellbrook amplifier is integrated inside the loop in a sealed and potted enclosure, I was unable to verify its claimed IMD specifications. The bottom of the loop is only 30 cm/1 foot) above the ground for stealth installation. EUR 270. Fortunately, George M1GEO was kind enough to provide the PCBs for very reasonable cost and thus I started this little project. In the past wide band HF loop antennas have not been cheap, normally costing $300+ dollars from manufacturers like Wellbrook. Description:HamGeek 50KHz-30MHz LNR Loop Pro Active Loop Antenna Amplifier Ultra Low Noise - Wellbrook ALA/FLEX1530LN It is a portable active loop antenna amplifier. Here is the schematic George is providing on his website at Aug 31, 2023 · Wellbrook replacement amplifier Everett N4CY. Thanks in advance for consideration of my request. A test of the Wellbrook ALA100 loop (16-meter circumference) in 1999 proved that this could indeed be the case. However, something is known about it. airspy developed an amp and the problem is that matching both the impedance at resonance, which peaks at around 9 mhz with over a thousand ohms, and the wideband behavior, which tapers to only 50 by the dipole phase, is challenging. Oct 23, 2019 · Wondering if anyone else has had this experience with the Wellbrook ALA1530LN loop antenna: Broadband noise/hash across the entire spectrum, floor, in the 31MHz range, with the amp disconnected from the aluminum loop, the R8600 is essentially silent. These two loops are used also as two arms of a small electrical dipole. 95 or 231. However, if you are trying to use the loop indoors it may be in a dead spot where the signals are completely overwhelmed by noise from within the house – you really need to try it outdoors or  · The "shorter" beverages of 2 to 3 wavelengths generally don't require a receive pre-amp at their feedpoint when the matching transformer is well made, but it's not uncommon for the longer, "sharper" ones to require a pre-amp in order to obtain best performance in actual use. 8/9dB higher gain compared to the current production ALA1530LN. In fact all active antennas don't quote SWR curves because the SWR is dependant on the source impedance of the receiver. Hang the loop over 1 or 2 tree limbs or double wrap the loop to make it self supporting as shown in one of the pictures. The original suggested BC547, BC549, 2N4401 and some 2N2222A. Wellbrook Communications has shut down their doors so what I am offering is the only replacement amplifier that is available for the ALA1530 loop. Sep 20, 2023 · LZ1AQ loop amp AAA-1C 106 Euros (amp board, enclosure, control board) Four remotely switched modes possible: Loop A Loop B Crossed parallel loops A and B Vertical dipole mode YouTube: LZ1AQ vs Wellbrook ALA1530LNa dead heat! DIY effort for loop elements and controller but extensive docs available online May 14, 2018 · adapters, connect the transmit/receive switch RECEIVE ANTENNA input to the loop amplifier output. 50KHz-30MHz Loop Pro Active Loop Antenna Amplifier Kit Wellbrook ALA/FLEX1530LN/ Opens in a new window or tab. 150 5. Mar 6, 2022 · WellGood loop on George Smart’s website, I immediately decided to build such an antenna. If you are interested please contact me off list at everettsharp@ everettsharp (at) Feb 20, 2020 · Wellbrook Communications’ ALA1530 head amp module, modified for female SO239 connectors enabling use of large diameter LMR-600 coaxial cable as a 2-turn loop element. ) and the large diameter coax elements (FLX1530LN) serve mainly a structural purpose to keep the loop Mar 26, 2015 · to the amplifier and reduces the loop/amplifier power transfer (gain) Wellbrook has solved the loop/amplifier matching problem by using a low inductance loop element, so that the loops’ reactance at HF is not too high. Mar 3, 2024 · An amplifier input impedance of 50 k ohm with 2pF shunt capacitance provides a -3dB lower frequency limit of somewhere around 65kHz. Cross Country Wireless Loop Amplifier; Loop Amp for Hula Loop SW Radio; LZ1AQ Active Antenna Amplfier; MiniKits Loop Feb 4, 2021 · A Wellbrook ALA1530 and longwire. One person decided he'd try to open the unit and figure out what was wrong. 1m dia. Thus far I have listened on 160 thru 17 meters. Surely, the Loran C is Description:HamGeek 50KHz-30MHz LNR Loop Pro Active Loop Antenna Amplifier Ultra Low Noise - Wellbrook ALA/FLEX1530LN It is a portable active loop antenna amplifier. It can be used Oct 26, 2024 · Above right, you can see my Active Antenna Amplifier AAA-1C loop from Chavdar, LZ1AQ. Reducing the amplifier input resistance to 10k ohm increases the low frequency - 3dB point to around 300kHz, and at 10kHz it is now at -30dB. Now I know. So there is no meaningful comparison. Therefore, there is a considerable loop/amp. Both versions of the 1530LN use the same amplifier, and I would imagine that the rigid loop (using 19mm tube) will give slightly better performance than one using coax, but not by much. Dec 3, 2024 · Comparing the LZ1AQ loop amplifier with the Wellbrook. Over on YouTube the Scanner and Sdr Radio channel has uploaded a video comparing four different brands of HF wideband loop antennas using an SDRplay RSPduo. outstandingdeal (9,710) 98. You could potentially avoid having to spend £264 on a Wellbrook loop too, if you're not super-fussy. 80 postage. A 3rd way of supporting the loop is to use a camera tripod and replace the center post with PVC to hold the Excellent Replacement For Wellbrook Loop Time Owned: 0 to 3 months. No lightening protection or diodes across the loop. Jul 11, 2021 · Introducing a new series of videos comparing the performance of wideband active loop amplifier/antennas for HF frequencies and below. I use this loop amplifier here at my QTH for my SDR receiver for coverage from 100kHz to 30MHZ and it is my best RX antenna. Nov 1, 2015 · Wellbrook loops supported on pro-audio speaker stands are a great way to go, and can easily be set up in the pre-dawn darkness. I built up several versions from our final traced-out diagram and they worked the same as the genuine Wellbrook ALA1530LN. 030 0. The amplifier is powered via the coax using a simple bias T. 050 17. This is an active antenna using a Wellbrook ALA100LN loop amplifier. The signal deteriorates a lot. My son lives in an apartment. Oct 19, 2019 · The comparison chart describes the interface as being passive, not the loop /amplifier (which is the “active” part). Jul 4, 2022 · No, a loop will not compete with a 5/8th on 10m, but it's not just about the cable losses. The loop and it's amplifier need to track the impedance presented to it by the actual loop, this is particularly important on the upper HF frequencies where a typical 1m diameter loop is approaching self-resonance. 143 3. VDSLx Spectum is allocated into UPSTREAM U0, U1, U2 and Aug 13, 2017 · Wellbrook states that the ALA 1530 and other models have no SWR. Normally a 500kHz to 30MHz wideband loop would have a nominal input z of approx. Mar 16, 2020 · The ALA1530S+ uses the same head amp. This 7. active loops are excellent for reception from longwave & medium wave upwards. 15 Ohms. It leaves room for experimentation and for designing both stationary and portable loop systems. I would like to thank everyone for their custom over the past 27 years. Everett Sharp N4CY made PCBs May 21, 2023 · The price for the built and tested LZ1AQ Wellbrook retrofit loop amplifier is $90,(Note this is the board only with all parts installed) which includes shipping with-in the US. The replacement amplifier fits directly on the loop with no modifications, or Sep 26, 2007 · aluminium Loop to feed signal to the built in amplifier housing, the ALA100 broadband balanced gain optimised amplifier comes housed in a small plastic box, which is Dec 16, 2020 · I know of several customers who have replaced a faulty Wellbrook loop amplifier with a Loop Antenna Amplifier + with similar results to the original amplifier if it is fed with 12 V  · On eBay I see a Chinese seller claims to be selling an ALA1530LN or an ALA100LN for a very high price of around $250, for the loop amp alone! I have no idea if it's a direct clone Sep 6, 2020 · Two of 2N2222A in my circuit. All Messages By This Member #72183 I've bought a couple of Everett's amps and installed them (at different times) on a homemade 10-foot diameter (10 meter circumference) copper loop and "smoked" both amps, my fault both times - one time was due to transmitting 700 watts into the loop This amplifier is intended for construction of small wideband active receiving antennas from LF to upper HF bands. Unlike the DX Engineering antenna which requires 24 VAC, power can be easily supplied by 12 volt batteries during portable At 11:20 16/12/2020, you wrote: Hi Sean, My ALA1530 failed as well a few months back with exactly the same issues, and I bought the CCW Loop (VLF version) as a replacement. ( low Nov 28, 2019 · Loop antennas and long wire antennas work completely differently, and even a smaller loop on the Wellbrook amp should pull in AM signals perfectly well. These links are here for historical and research purposes. With the K9AY amplifier off, the loop was 1-2 dB quieter. RF signals are Dec 9, 2020 · Well, it's like comparing apples and oranges; the MLA-30 is a very cheap loop and has a number of design flaws, but it's cheap and the flaws can (to some extent) be corrected, the WellBrook loops are "top of range" but cost a lot more; then, willing to build a wellbrook "clone" yourself, you may find the informations and schematics here although, sincerely, if you're Sep 16, 2016 · All of the ones that I can find online have center pin positive outputs (such as the TalentCell 12V/6000mAh rechargeable battery that I’ve purchased to power my other, more recently produced, Wellbrook Communications active loop antenna whose amp needs a center pin *positive* input). I have no connection with that poster, just passing it along because the LZ1AQ loop amp is a Jul 8, 2021 · Steve Ratzlaff recently uploaded test results of an AA7U/N4CY loop amp compared with a comparable Wellbrook loop amp: Jan 11, 2025 · This design is about a clone of a clone. The amplifier is potted, so fully protected from the elements, and I have the biasT in the shack. He welcomes comments which will help shape the content for future antenna experiments: The LanA amp looks interesting. The screws that hold the loop element to the amplifier module have a tendency to build up a very fine corrosion inside the plastic, were the screw meets the loop, and this causes poor connections. Sponsored. Wellbrook ALA 330S Active Loop Antenna Wellbrook ALA 330S Broadband Active Loop Antenna UPDATE: As of April 2023 Wellbrook has closed and is no longer doing business. Aluminium LoopThe Wellbrook ALA 330S directional Loop antenna for short wave. The history and earlier versions of the project, including schematics and details of operation can be found on the WellGood Loop History page. Mar 31, 2024 · Comparing the LZ1AQ loop amplifier with the Wellbrook. UK and European version with  · As I suspected, the badly mismatched 30MHz input low pass filter messes up the frequency response. It is a VERY GOOD systen. 250 8. Now I have the Wellbrook loop at the other side of the house as far away as possible (which here is 7 m/23 feet). Oct 19, 2024 · When I first got into magnetic loops in 1998, I played around with homebrew designs, but finally settled on the Active Antenna Amplifier from LZ1AQ, which performs really well. Owner/designer Andy Ikin closed shop and later passed away. May 27, 2021 · With this type loop the Wellbrook amp module is typically on the bottom so no bracket or support is needed there. Not cheap, at about USD 225 including shipping for the amplifier and power injector, but not including the loop, mounting hardware, or feedline. 2%. But I always wondered how it compare with the Wellbrook. " with smd 2SK932 jfets (but others schematics are very similar) I'm asking because I made a couple of them over time, one even with the original 2SK715 jfets but Aug 28, 2021 · These are loops from Bonito, Cross Country Wireless, LZ1AQ and Wellbrook. Click here for a loop antenna rotator control diagram. Opens in a new window or tab. 36. EUR 265. This Balanced low impedance Magnetic loop has enhanced performance Feb 12, 2018 · 1. Having had a WellBrook Loop ALA1530 for some time, I accidentally transmitted into it during a moment of madness where I wasn’t using the RX antenna connector. VDSLx Spectum is allocated into UPSTREAM U0, U1, U2 and Mar 6, 2021 · Subject: [loopantennas] New wellbrook loop not working #file-notice Hi my new wellbrook ala1530ln gives me zero hf reception (tested on two receivers). The Loop is 15-25db quieter, depending upon band conditions. 00; Description: WellGood Loop project which was originally devised to help repair the WellBrook Loop ALA1530. where sealed but had 4 of his loops and he always replaced my amps at no charge although the original to replace the amp it wasn’t easy like the w6lvp loops amp are Mar 21, 2020 · 2x J310 Push-Pull Low-noise HF pre-Amplifier (30 KHZ - 30 MHZ) Built & Tested NEW 2022 VERSION UPGRATED WITH: BY-PASS RELAY (The pre-amp switches in-circuit as long there is DC feeding either from the Bias-T or from the DC input connector) BIAS-T throuh the output connector going to the receiver Nov 17, 2024 · The Signal Sweeper-How to Build a Portable Wellbrook Loop Antenna; Wellbrook Antennas. Mar 26, 2016 · Small Magnetic Loop Antenna with Broadband Amplifier for SDR Reception. The Wellbrook Loop Antenna costs £119. Joined Jul 22, 2016 Messages 185. by TomL. Regards Lino. Premium Subscriber. HamGeek 50KHz-30MHz LNR Loop Pro Active Loop Antenna - Wellbrook ALA/FLEX1530LN. The other antenna is a Wellbrook ALA1530 (about 12-14 yrs. Feb 9, 2018 · Wellbrook Loops. All Messages By This Member #72183 I've bought a couple of Everett's amps and installed them (at different times) on a homemade 10-foot diameter (10 meter circumference) copper loop and "smoked" both amps, my fault both times - one time was due to transmitting 700 watts into the loop Nov 1, 2015 · This is a comparison file of weak signal reception with the two models of Wellbrook Communications “Imperium” series loop antennas: the ALA1530LN “Pro” Imperium and the ALA1530S+ Imperium. Loop antennas for outstanding directional radio listening and reception monitoring of medium wave, long wave, short wave and HF DX. The other piece is only a lower injector and signal separator. Feb 14, 2015 · The loop is 1M in diameter. Thus 3 different antennas can be used. They all perform better at different times and days for different signals. Each amplifier consumes about 80mA and I measured the total current consumption of my unit as 165mA. Mar 23, 2023 · Wellbrook Communications will cease trading at the end of April 2023. The price is also good compared to more expensive options out there (Wellbrook, Pixel From: CrossCountryWireless@groups. This contained the uPVC Box containing the head end amplifier, , the Antenna Interface box to connect between the Dec 2, 2018 · I will have got the wellbrook active loop to compare it too and a few pk loops dipoles. by Dave Gahimer (K9ZCE) Those with limited space, or antenna restrictions, might find a small 1 meter loop antenna a solution. the output of an active antenna is Sep 14, 2021 · ALA1530LNPro Imperium.  · "A new version of the world famous Wellbrook Active Loop ALA1530 50kHz-30MHz 1m dia. Sep 6, 2020 · You may remember I did a similar repair to my Wellbrook many years ago with just two transistors. I found receive quality and level the same as my much larger Wellbrook loop. Although the loop preamp and the input to most radios are 50 ohms, my experiments indicate that quad shield RG-6 cable with F to BNC adapters is not only inexpensive but has good common mode rejection. I rebuilt the amplifier from a circuit found on the internet which was a fairly simple balanced design — but it does work, giving a good noise reduction relative to the wanted The Wellbrook K9AY has been widely acclaimed by many DXers, and several articles have been written about it, among others by Guy Atkins and John Bryant. here’s a YouTube video showing how well it compares in an apples-for-apples setup alongside a Wellbrook 1530AN: Regarding our look at antennas we can recommend, many Jul 12, 2021 · The loop antenna is a Wellbrook ALA1530S+ is a 1 m diameter loop antenna. 2uH inductor to simulate the loop is approx. Free returns. The antenna stand alone costs £144. (It's kind of showing its age). Because of the smaller diameter loop and thinner coax, it packs down to a much smaller and lighter package than the 1 meter LMR400 version. Back in 2021 I reviewed the CHA-RXL loop by Chameleon. These have been my main listening antenna for nearly five years. I found out that potting is a very messy process. is only matched to the loop in the mid HF band. Sep 3, 2022 · The Chameleon CHA-RXL Pro: Improved Amp Board Raises the Game. There is a LM7809 3-terminal regulator in the loop unit to provide a low This amplifier can use two separate small magnetic loops. The frequency response, swept using my DG8SAQ VNWA, was poor, with low gain compared to a real LZ1AQ loop amp using good transistors such as 2SC5551A. Two of 2N2222A in my circuit. VDSLx Spectum is allocated into UPSTREAM U0, U1, U2 and May 27, 2021 · With this type loop the Wellbrook amp module is typically on the bottom so no bracket or support is needed there. Results matching fewer words. 95 including UK Value Added Tax (post free in UK and Ireland), plus £20 shipping costs to addresses outside the UK Still “building” my ccw low-cost loop setup. One thing W6LVP offers is custom notch filters before the preamp for your local blowtorch AM station and that can make it rise above the other brands if IMD is a problem. This loop has a lower visual impact than the Wellbrook and despite being a 12th of the cost of the Wellbrook, certainly isn't a 12th of the performance. His design is derived from the well know WellBrook-Loop model ALA1530. This Balanced low impedance Magnetic loop has enhanced performance compared to shielded and Moebius loop types. from China. May 28, 2021 · Wellbrook FLX1530LN Amplifier Mounting Provisions; If the CC loops exhibit too low impedance, I can try running the two loops in series (as you suggested previously in another thread), or multi-turn each of the CC loops. io] On Behalf Of Alan Gale Sent: Wednesday, December 16, 2020 3:22 PM To: CrossCountryWireless@groups. These will be the last that I will build for a while, as I am working on other projects. 550 11. The ALA100LN uses the same diode input protection as for all the other loop amplifiers. I think this is very important because in some cases and with I recently redesigned the LZ1AQ board, making it smaller and all SMD. The loop has the ultra low NF of the ALA1530LN, plus a Norton amp. All Messages By This Member #72446 I have retrofired my improved version of the LZ1AQ Loop amp to fit the Wellbrook ALA1530 Loop. i. outstandingdeal_us (682) 96. It's 100 times better than the Wellbrook designed amp, which corrodes and actually has more output than the original. io Subject: Re: [CrossCountryWireless] Loop Amplifier as a Wellbrook replacement At 11:20 16/12/2020, you wrote: Hi Sean, My ALA1530 failed as well a few months back with exactly the  · Wellbrook ALA1530 Loop Replacement amplifier Mark Cayton. I have some new ideas to improve The ALA 330 as well as other loop antennas suited for emission can be obtained from Wellbrook Communications, Wellbrook House, Brookside Road, Bransgore, Christchurch, Dorset, BH23 8NA, U. Optimum loop/amplifier power transfer occurs over a narrow The W6LVP mag loop includes a combination transmit/receive antenna switch and power inserter for the loop amplifier which enables a receive antenna to be easily used with transceivers, such as the popular Icom IC-7300, lacking a separate receive antenna input. This loop has approx. The amplifier has four remotely switched modes: Loop A, Loop B, crossed parallel loops A&B and dipole. I use 30 m/98 feet of RG-58 with BNC-BNC. All Messages By This Member #36047 I just finished building up a few Improved LZ1AQ loop amplifier boards that I have potted and ready to install on your ALA1530 Loop. No doubt, the venerable Wellbrook loop has helped thousands radio enthusiasts mitigate RFI/QRM and make it possible to once again DX from home. It consists of 34 feet of wire spread into a square (8. to a ‘fat’ tube or metal strip can result in >10dB difference in S/N ratio at the receiver almost regardless of loop Jan 5, 2025 · All of the radios in my shack use a Wellbrook 1530 loop, fed through a RF Systems DA-8 Distributor/Amplifier which maintains signal levels from all outputs. I also have some Retrofit LZ1AQ amplifiers that have been designed to Sep 19, 2019 · Recently Chinese manufacturers have begun producing a low cost wide band (100 kHz - 30 MHz) magnetic loop HF antenna known as the MLA-30. K. To optimise the power transfer, the amplifier has a input impedance that matches loops’ reactance over the designbandwidth. The antennas were used by many professional services Jan 11, 2025 · Following the footsteps of the WellBrook and the WellGood in this article, here's my version: 'The WellFlex Magnetic Loop Amp'! Two amplifiers dominate the market for magnetic This loop has a lower visual impact than the Wellbrook and despite being a 12th of the cost of the Wellbrook, certainly isn't a 12th of the performance. This provides true diversity reception. The MLA-30 was slightly modified with Aug 28, 2022 · – The Wellbrook FLX1530LN with a 0. My old wellbrook loop failed a few years ago Apr 5, 2020 · Hola Amigos, I combined this loop with the MLA-30+ amplifier and it works very well, however; it was not possible to connect the coaxial shield that forms the loop with the cable that goes down to the T-bias. If you can't wait for my testing results, there are a number LZ1AQ Loop amp retrofit for Wellbrook ALA1530 Loop Everett N4CY. I started out with intention to use a clear top junction box but while considering dissimilar metal corrosion I remembered I'd also ordered a larger enclosure that may keep most electrical connections inside, I decided to temporarily  · Wellbrook ALA1530 Loop Replacement amplifier Mark Cayton. With low-noise amplifier and transmit/receive switch and power inserter box for the LNA that allows radios such as the IC7300 with no separate receive input to easily use both a separate receive antenna and a transmit antenna. May 12, 2012 · This photo is taken from my daughters room above alfresco on the left is the Wellbrook-ALA1530L,right Wellbrook-ALA1530 the other 2 loops ALA1530AL-1/330S are in the radio room will be up on the same roof soon. 6dB is one S-unit. 50KHz-30MHz Loop Pro Active Loop Antenna Amplifier Kit Wellbrook ALA/FLEX1530LN. These will be the last that I will be building for quite awhile. He Jul 15, 2021 · We have taken a look at the LZ1AQ active mag loop antenna amp and found it works very well. by Dan Robinson. The mechanical construction of the particular loop/dipole antenna must be performed by the user. Second Hand Active Loop Antenna ALA1530 Aluminium, The world famous Wellbrook Active Loop ALA1530 long, medium and shortwave antenna. So far I have tried several transistor Dec 3, 2023 · From a good active magnetic loop antenna i expect: - a flat frequency response over a widest possible frequency range - low noise figure (= high sensitivity), minimal degradation of the SNR even at the frequency limits of the loop/amplfier combination - high linearity - 2nd, 3rd, 5th order Intermodulation products not perceptible as under the Magnetic receive-only loop. Aug 13, 2017 · In fact Wellbrook tested the loops with two signals at +10 dBm S9+80 dB output to be sure that there is no risk to work with a preamp offering a too low dynamic range but also to prevent so a true black box working as amplifier on which it was written "antenna" on one side and "receiver" on the other side from which run a small coax RG58C Oct 19, 2024 · When I first got into magnetic loops in 1998, I played around with homebrew designs, but finally settled on the Active Antenna Amplifier from LZ1AQ, which performs really well. The amplifier is indeed in the base of the loop (and potted to hide its design). All I did was cut off the old amp with a hacksaw and then drill a couple of Jul 23, 2014 · Again, had the loop been just slightly smaller, I think this preamp would do a great job as a wideband loop amplifier for the BCB and above. old) , which is located about 10m further way than the CCW and at about half  · In the morning when temperatures were cool the loop amp would work but when temps rose they became intermittent. The far superior Wellbrook Model ALA1530LN and DX Engineering (Pixel/Inlogis) Model RF PRO 1B wide dynamic range active magnetic loops are in a different performance league entirely, as are homebrew active loop antennas based on the LZ1AQ or the MiniKits EME234 pre-amp. Jun 22, 2021 · Which Wellbrook antenna offering would suit me best? My rig is a Kenwood TS-590SG and it has a dedicated port for a recieve antenna. 1dB at HF. they got good gain on low bands but the behavior at fm trashes it. Here is the schematic George is providing on his website at Jul 14, 2006 · The loop amplifier has a third order intercept point around 42dBm, confirming the manufacturer's specifications and that is fairly constant throughout the frequency range of 150-30 MHz. It gives useful gain even in the air band. Watkins Johnson 8718A/MFP. So, perhaps on the Wellbrook loops the tubing elements (ALA1530 etc. The designer has really slipped up here by using a filter designed for 50 Ohm termination impedance, but with a low impedance loop as the source and an amplifier having an input impedance ranging from 1. On the left, about 25 feet into the woods, is my Wellbrook ALA-330S loop, recently purchased used from a local ham in Calgary. The only form of payment that is accepted is a Postal money order, Walmart money order, or cash. The loops he tested include the cheap Chinese MLA-30 (~$40), the Cross Country Wireless (CCW) loop ($70), Bonito ML200 (~$442) and the Wellbrook 1530LN (~$305). You will find a loop antenna has not so good low angle radiation angle. The loop can be found on eBay for under US$45 with free shipping. On 160 and 80 there is no comparison. It really brought in stations I had never heard before or strong stations in a more powerful way that made the audio really pleasant to listen to. These are all potted and ready to The world famous Active Loop ALA1530 and ALA100, developed by the legendary Wellbrook, were the first choice for long, medium and short wave receiving antennas. Aug 31, 2023 · Wellbrook replacement amplifier Everett N4CY. 5K Ohm to a few hundred Ohms, as the load the response Jul 8, 2021 · Steve Ratzlaff recently uploaded test results of an AA7U/N4CY loop amp compared with a comparable Wellbrook loop amp: Oct 25, 2019 · Over on YouTube the Scanner and Sdr Radio channel has uploaded a video comparing four different brands of HF wideband loop antennas using an SDRplay RSPduo. My previous Loop on Ground (LoG) experiment was useful which entailed connecting my Wellbrook loop amplifier to a 100 foot loop of speaker wire in the field at my favorite local Forest Preserve. The LAZ1AQ amp and the ALA1530 from Wellbrook Communications. The approx. Sep 2, 2023 · So I decided to design the Improved LZ1AQ amplifier so that it would fit on the ALA1530 loop. All Messages By This Member #19750 I made a folder in Photos just now and uploaded the schematics for ALA1530LN, ALA100LN, FLG100LN that I've traced out in the past. iezawnwr sbia xmlxtw qaa zfto nto zlsuc rpzymp sbgc skyr