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I also applied the KD1JV diode mod and VOX resistor mod...

I think probably it is a good time to join the Black Friday Sale: HT-1A kit or assembled kit 10% off by manual partial refund This Friday to Sunday only Ship in 3 days Thanks, Adam

Thank you Adam. Keep bringing us kits!

| | | | Thank you Adam.And happy thanksgiving to the group.BOB? AF2DX

Thanks for all your support. Happy thanksgiving to USA and the rest of the world. Thanks, Adam, BD6CR CRKITS.COM

I applied the following changes...Changed C5 to 105 and C6 to 103 (capacitive vs resistive divider) and applied audio drive just above the threshold for reliable VOX PTT...My DSB output went down to

Around 7V? Is 78L05 in the right place? Thanks, Adam

In my case I had an issue with the solder joints for the coils: the enamel wasn't properly removed. TX would trigger but my signal was not spotted anywhere. I would recommend checking these joints,

Interesting so I just called cq on my other radio while monitoring the audio out put of the DSB and I can hear the signal but its really crappy. I.e I dont think it would successfully decode in

Ok so looks like pin 8 has around 7v and I am trying to work out how to test the crystal oscillation

Daniel, Start checking in RX the voltage on pin 8 of NE602, and then check the oscillating of the crystal. Based on your description, I suspect your NE602 is not working properly. Thanks, Adam

Hi I have completed my DSB 40m build but cannot get any audio out of it have tried connection to usb sound card, pc, external Speaker and headphones Vox triggers tx but I dont see any signal being

re? ?FT8 / FT4? TIME? plus/minus? one second When Internet not available ... WWV? Colorado?? 5, 10, 15 mHz? ? ?two thumbs up CHU?? Ottawa???? 3.33, 7.85, 14.67 mHz? ? gets the

Any crystal will oscillate in overtone mode. All crystals can oscillate in series and parallel resonance modes at fundamental and overtones. The only way the swr would be high with the D4D and not

Bill, The crystal is not overtone type. Also the LPF should do the job to filter the 3rd harmonic products if any. Thanks, Adam

Can you receive 20 Meter signals on the D4D? If not it is possible that the crystal is oscillating at the 3 overtone. This could produce a VHF signal that would be way off frequency and produce a

Kurt, I saw the same. Nothing is wrong at your side. I believe the main problem is the wide spectrum caused by IMD. The IMD modification should help, but I will not expect it will be gone. The D4D

Kurt, I am having almost exactly the same experience; with the 20 meter D4D as well as with the QRPGuys DSB TRXCVR. I am inclined to believe that double side band is not a good way to go. I suspect

Hello All, I have a 20M D4D, and I think I may have a problem with it. I have been a bit mystified that I have so far only had 1 contact on this thing even though I've been on the air with in for

Hi John, For what it's worth, I built two D4D kits and did effectively no real testing (my bad!): but in both cases the kits worked out perfectly. I just followed the instructions carefully and made