M0ayf loop amplifier. If interested please contact me off list at everettsharp@.

M0ayf loop amplifier . Currently there are no commercial manufactures of Norton amplifiers, so I deceived to design a printed circuit board for the Norton amplifier. I have a modest hobbyist test bench and am fortunate to have a Two-Tone IMD test set for doing Intercept Point tests. Io <gareywittich2000=yahoo. Because they are typically constructed with coaxial cable, the loop inductance, being proportional to the square of the diameter, resonates with the distributed capacitance of the cable at a surprisingly low frequency. The Push Pull Norton amplifiers are low noise, have very good IMD properties and have a high tolerance to overloading. #50996 I just finished building and testing 3 M0AYF Loop Amps, 1 LZ1AQ Loop amp and 1 Norton amp, Jan 3, 2018 · I listen the HAM bands from 160m to 10m, especially the FT8 mode. Apr 15, 2020 · Hi Everett Whats the difference between the M0AYF and LZ1AQ, I have used a couple LZ1AQ but they have both suffered water damage and I need just a simple amplifier without all the switching etc I'm only interested in 160m - 40m here Do you have a circuit diagram of a suitable amplifier, I have 2 loops x connected at the center similar to yours but made from the PEX-A-PEX and have been using Jul 20, 2019 · The Circuit uses Steve Ratzlaff modified M0AYF loop amplifier design and I designed the PCBs. However, tests after dark revealed overloading of the loop amplifier from powerful SW broadcast stations. The simple active receive loop used was found on the internet (link = broken). Initial daytime tests with a 1 Metre diameter loop proved the loops ability to receive signals over several octaves and with much reduced local QRM levels. My intention was to see if I could easily filter out the FM BC interference that Carlos was experiencing. It comes with its own Bias Tee injector that I'll also be setting up. The circuit board is 2” X 2 3/8”, with a copper ground plane on each side of the circuit board. As a Radio-Amateur his main focus is on the classical HAM-Radio bands. Its called the LAMB-1A from www. Feb 26, 2013 · Loop antennas (magnetic) are known to accomplish this. s monthly publication) with full permission of the RSGB subject to the inclusion of the f ollowing copyright statement: Aug 8, 2020 · Modified_M0AYF_Loop_Amplifier. Jul 21, 2019 · Bottom line - The improved M0AYF" loop amp can provide reasonable results, and is fine for something like an RTL dongle and possibly an SDR Play, but if you are using a better performing receive such as the Airspy HF+ (or similar) then the LZ1AQ is a better choice. com. 5K Ohm to a few hundred Ohms, as the load the response curve is all over the place. Modified_M0AYF_Loop_Amplifier - Free download as PDF File (. 360 ohm input impedance!The Wellbrook ALA1530LN loopamp as well as the N4CY version LZ1AQ loop amp (using 2SC5551 transistors) both easily hear this NDB (using the new CHA RXL loop and CHA RXL bias tee). You could add a 20dB pre-amplifier, but to be honest IMHO the Youloop is a good example of marketing hype rather than sound technical performance. Nov 16, 2019 · I also converted the Modified M0AYF loop amplifier boards over to the BFQ18 and have 3 of them built that are for sale and I still have 3 of them with the 2N5109 for sale. When the supply is present at the pre-amp the loop is connected to the pre-amp input. 61 MB, MIME type: application/pdf) Summary This is an article describing the modified M0AYF loop amp by Steve Ratzlaff AA7U Jan 20, 2021 · The sheilded loop antenna , because it is so good, must preforce come with some caveats ! The main limitation is the upper frequency limmit. pdf), Text File (. There's no circuit on the site, but as it's a SMD-based product it's easy to deduce a lot from the photo of the PCB. Jul 23, 2018 · On Mon, Jul 23, 2018 at 5:04 PM, gareywittich2000 via Groups. The noise has reduced a lot and listening to the low bands is not annoying anymore. If anyone is interested in any of the above built and tested boards please contact me off list at everettsharp@ Nov 9, 2021 · The Youloop by itself is not suitable for use with a KiWi SDR, as it does not have sufficient gain. If interested please contact me off list at everettsharp@ Everett N4CY Nov 17, 2024 · Cross Country Hi Z Amplifier; Cross Country Wireless Loop Amplifier; Loop Amp for Hula Loop SW Radio; LZ1AQ Active Antenna Amplfier; MiniKits Loop Antenna Module; Modified M0AYF Amplifier (PDF) RF Preamp Kit; Wellbrook LA100LN-M (NA version) W6LVP Experimenter's Kit; 2x J310 Push-Pull Low-noise HF pre-Amplifier (30 KHZ - 30 MHZ) HF Wire Loops M0AYF (QRSS Knight) Contents of this website. Everett Sharp N4CY is who put this all together. The loop amplifier draws about 60mA at 12VDC and 70mA at 13. io> wrote: Greetings: I have some soft aluminum ( 3003 ) tubing and will be connecting it, as a Loop, to my Balanced M0AYF Loop RF Amp Input. com, the US e-bay platform. pdf ‎ (0 × 0 pixels, file size: 1. My current attic loop is 1 meter in diameter hung from trusses in the attic, in a symmetric loop with the amplifier at the bottom, figure 6. M0AYF, LZ1AQ and Norton AMP Everett N4CY. casarain. Modified M0AYF Loop Amplifier design by Steve Ratzlaff AA7U PCB designed by Everett Sharp N4CY The loop amplifier draws about 65mA at 12VDC and 75mA at 13. Sep 28, 2019 · So if you are interested in coverage from 200kHz to above 20MHz then the Modified M0AYF loop amplifier would be the best choice and I was quite impress at how well it worked. *** Most Popular Page! Wide Bandwidth Active Loop HF Antenna *** What is QRSS? Receiving QRSS. However I'm somewhat concerned that the amplifier input impedance looks to be less than ideal, and on the MF bands may actually work just as well as a short 'active dipole'. S. His aim was to achieve best result with as few components as possible. 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. The M0AYF loop amplifier does have a lot of gain at the LF end and the input impedance does fall as the frequency increases, so the setup does work. Many THANKS for your answers, Jun 29, 2021 · Anyway, a 2. I was able to use my Clifton Labs Z1501D Active Whip Antenna to compare with the loops, which is on a A/B switch. I was also the one who introduced the use of the trifilar transformer in this circuit some years back. 2 Mc ) using my M0AYF "Modified" RF Loop Amplifier with the Loop Element being - approx 1 Meter Diameter / using "Utility Grade" copper Tubing of 0. Yesterday I decided to build the M0AYF loop amplifier (improved version of G8CQX design) that can be found in the files section of this group. 4 mm; Inductance 4uH . 8VDC. Jul 21, 2019 · The Circuit uses Steve Ratzlaff modified M0AYF loop amplifier design and I designed the PCBs. Reproduced here from the " Technical Topics" column of the June 1986 edition of "RadCom" (The R. The transistors are a matched pair of SMD 2SC551s. Besides low noise, CMR, IP2 and IP3 are the figures of merit for an active antenna loop amplifier. Loop antenna A schematic of the pre-amp and its associated power-over-coax unit is shown below: The power-over-coax unit uses PTT to gate the supply voltage to the pre-amp. The LZ1AQ is designed to work with a loop of 1m diameter made of aluminium pipe of 3. As I suspected, the badly mismatched 30MHz input low pass filter messes up the frequency response. G. txt) or read online for free. Transmitting QRSS. B. This provides some protection from the transmit antenna. Oct 5, 2018 · General Info: I have a Windom Antenna up about 25 feet and I get "about the same " Signal Strength on 40 Meters ( 7. Oct 17, 2019 · I am selling a version of Dallas Lankford’s Push Pull Norton amplifier. I will not build anymore with the 2N5109 transistors. Here is what I found: Jun 12, 2021 · There is another inexpensive loop amp kit which appears on ebay. Nov 7, 2024 · PA0FRI and some friends have made a lot of effort to build various variants of this loop amplifier type to get the best out of it. Mobius loop gave a little higher S meter readings then did the conventional shielded loop and had a lower noise floor on LW and MW. com@ groups. John's (now G8CQX, previously G4UAZ) original active loop antenna design upon which the M0AYF version is based. 9 ohms at 136 kHz--an extremely severe mismatch to the loop amp's approx. I built the "Improved M0AYF Loop Amp" today and tested it on the bench. Figure 4 If anyone is interested in a Modified M0AYF loop amplifier board built and tested, I just got a fresh batch of boards in. (5) I replaced the M0AYF amp on the wire loop and tried a Kits and Parts preamp in its place, using a 1:2 matching transformer, and noticed a big improvement on LW with lower noise and stronger signals. 5" OD . So I build this simple active receive loop antenna to see if they work… and they do. (2) Both the shielded and Mobius loops using the Kits and Parts preamp, did a much better job of reducing most electrical noise, than did the active wire loop using the M0AYF amplifier. Aug 4, 2020 · Ordered a Modified M0AYF amp as a replacement for the Pixel RF Pro-1B amp that keeps going deaf at times. The Mobius loop had a very Jul 1, 2024 · M0AYF Improved: Input Z is more HF-friendly for a 1m loop without the need for a matching network, but CMR, IP2, and IP3 seem to be a bit worse than the LZ1AQ. At any rate I believe this to be an easy kit building block for a simple phantom powered broadband loop antenna. 22 uH loop has a reactance of 1. pcu zaldm tpvwf nwxfvl wfmr htl mmdxera fbb ruyy gfgaap bfs atja ttwsr tkkrl xvb