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Sverre, here is a photo of how I modified the 80M winding to a 26MHz winding. Look closely and you may see I cut the tap at the end of the 40m winding on L12 (at 36 turn point), removed the last 5

Hi Sverre, remember this is work in progress.... I chose the values from ELSIE to give a 5 order elliptical LPF. You will see I have attempted to cut off the third harmonics on Tx from 18mhz to 30mhz,

Hi Ken That’s interesting! I got my own QDX last week, and am halfways through the build now. I’m leaving the 80 m filters out for the moment, getting ready first for the input BP filter. it would

Will, I am sorry to hear that PA is dead. The PA bias is needed to be adjusted as per assembly manual, so just a bit back from the finals to conduct.? To be class C amplifier.? No matter what the RF

Hi Adam, re tx testing… I did not mention it but I was using Putty on the raspi to enter terminal mode in the first place. I have just found out that you can’t do continuous key press over VNC.

Bill, My comment on using a dummy load reduces the chance of RFI causing the QDX to cause the drop out of the transmission.? The dummy load is not an issue; it is a way to help isolate the problem.

Wilson Little <wilsonlittle66@...> wrote: Hmm, then you're right -- it shouldn't happen. At least not if the load was properly matched (but I was running this PA with a severely mismatched

?The amp was previously adjusted for the correct bias and was in use with a QCX radio. I don’t believe it should have needed adjusting just to use a different radio source, the QDX. Maybe I am

Turns out my 67 year old self isn't much better with decals than my 11 year old self! I think I need to not move them as much? and trust the force. I'm trying a bit more acrylic spray as well.

KEN G4APB <lfoofui.nbz42@...> wrote: If you're connecting via VNC to raspi and can't just press and hold p or t, try this: 1. Use PuTTY on the local machine to connect to the raspi via ssh

Ronald Taylor <wa7gil@...> wrote: I agree. Looking at the schematic of the PA, I'd check Q5. It might have a short-circuit (or near short-circuit) between it's gate and source.

Wilson Little <wilsonlittle66@...> wrote: Did you adjust the bias voltage (R5)? Amp shouldn't be keyed without setting it to minimum (counter-clockwise) first. Fortunately most probably nothing

Were you aware that you can get waterslide decal paper that's printable with an inkjet printer? There's both white background and clear background available. So you can roll your own. 73 Jim N6OTQ

I'm having terrible luck with the waterslide decals, but I've squeezed the tuner into a smaller box.

Ronald, Thank you very much for this communication. Unfortunately, I rush to the next step before receiving. You can see the results…. No so good. But, on a positive note, more things to play with

Good News / Bad News Good news was I found a 100 ohm resistor to tack in parallel with the QDX R10 resistor, and it enabled the QRP Labs’ 50w Amp to turn on. The red TX led might be a little less

Will, your measurements were very thorough. Thank you for those. Those measurements are pointing to some other issue that we aren't yet seeing. You are showing almost the entire 5 volts dropped across

Oh, _that_ kind of dummy load, that everyone else in the known universe calls an attentuator. Makes me wonder if there's some other miscommunication going on here. Which one of those 'dummy loads' do

Please explain about the dummy load being an issue. BTW, this dummy load requires no interconnecting coax- has bnc male on one end, female on the other. My combination dummy load / attenuators consist

The answer is yes. Because you said that with QCX the PTT switching works and because your measurements show that the voltage drop over the 470R in QDX is too much. 73 Bojan S53DZ