Hello DK7FC, I did the decoding tests successfully, whilst I would like to try it I am up to my eyes with work at the moment, and I also have to ascertain if the local noise I now suffer on 136khz is
Hello LF'ers, 24 May 2017 If I run the combiner on my 2 amps the LPF centre toroid heats up. I made a silly mistake with setting my U3S driver the other night and instead of TX'ing every 30 minutes i
Hello Stefan, Thanks for the reply. The filter is shown here: http://www.w1vd.com/LPF.html and the schematic here: http://www.w1vd.com/LPF.pdf Jay (W1VD) did say it was critical. This is on the amp p
Hello Clemens, 25 May 2017 I would have done that straight away but I stripped the burnt wire and Kaptan tape off the middle core yesterday ready to rewind it. I made a reply a few minutes ago to Ste
Hello Clemens, So in simple terms, does this mean that it is to be expected that the G3YXM LPF will NOT work correctly on the W1VD amp? If so, again in simple terms please ;) , why? http://www.wirele
Hello Marco, My loading coil drifts as it warms up, but that's only when a kW or so is run, not at low power. But I think you are testing into a dummy load? I also had a poor drain waveform on one si
Hello LF'ers, 04 June 2017 Marco, do you have the means of posting screen shots of the gare and drain wave forms? I am always keen to see just what people consider good and bad ones and a capture spe
Hello Alan, No, what he needs is a video camera, and the courage to post the result here for scrutiny, we need a bit of fun now and again ;) Good luck Marco, what's the worst that can happen.... :) -
Hello LF'ers, I have had a few issues with my lovely old Farnell H60/50 linear bench power supply. It'll do 60V @ 50A but I suspect it's last couple of uncontrolled output voltage failures may have b
Hello Mal, Is this what you need "Antenna Coupling Unit" near the end? From 2E0ILY https://groups.yahoo.com/neo/groups/SkantiRadio/files/TRP6000/ -- Best regards, Chris mailto:[email protected]
Hello Lawrence, Sorry for late reply, work and a dodgy e-mail service from something gone wrong at my ISP. I haven't as yet tried any caps on the LV output terminals, would 1uF ceramics be appropriat
Hello Stefan, Thanks for the reply, with regard to the current transformer, where does the 1 Ohm resistot go?? In your drawing of the chokes can I assume the six turns each you drew is accurate and y
Hello LF'ers, My scopemeter shows current and voltage waveforms of course, but what relationship does the current waveform have to the actual antenna current? I am sad to say I haven't yet built a tr
Hello Nick, Sorry, for some reason I always call it a scopeMETER wheras I really mean a Scopematch, and I too have built it to give equal height traces. the traces are perfect sine waves and near as
Hello DK7FC, Hi Stefan, I replied in depth as to what I really mean above. I mix Scope meter and scopematch up sometimes ;) I have never tried JT9, and am not sure if my U3S exciter runs that mode. H
Hello DK7FC, I have never tried JT9, but it appears my U3S exciter covers that mode. What time span (there's JT9-2 upwards it seems), and what frequency is appropriate? I am happy to give it a shot!
Hello Chris, Is anything else picking up RF? I had a sort of similar issue ages ago whereby using an autotransformer to impedance match to the loading coil RF seemed to abound everywhere it shouldn't
Hello Stefan, Just seen this, sorry. I am happy to try and retune the loading coil to 137.4, my only issue is I have no quick and easy way to change between TX and RX as I am sing the same antenna fo
Hello Chris, Is anything else picking up RF? I had a sort of similar issue ages ago whereby using an autotransformer to impedance match to the loading coil RF seemed to abound everywhere it shouldn't
