开云体育

My QMX went deaf yesterday after working for about 4 months. Found some questionable solder joints on T2 (QDX number). Fixed them and it came back to life so check them over. 73, Cliff, AE5ZA

On 27/09/2023 10:27, Nick Norman wrote: > Good morning all, > Here is the tale: > At 09:15:45 on the 19th Sept my QDX went deaf - and subsequently shown to be mute as well (<0.6W all bands) > The

After thinking about your coments about the "new" winding method for the output transformer, the transformer should not increase in temperature. As you were having a reduced output power and the

I fixed a QMX once that had a similar problem. ?I was stumped for a while. ?Then I removed L509 and replaced it with a new one. ?That fixed it for me. ?I think these inductors are pretty sensitive

I went on 20m with my QCX mini for the 1300z session and worked OK2BQN, DD6DO (both QCX) and OK/SO6A/P (rig not stated). No response to CQs around 14060 despite reasonable coverage on RBN. Chris

Good morning all, Here is the tale: At 09:15:45 on the 19th Sept my QDX went deaf - and subsequently shown to be mute as well (<0.6W all bands) The sweeps look horrendous! i.e. random noise

'if it ain't broke, dont fix it' applies !! I rebuilt my output transformer in my QDX as mine was originally wound for 9v, then modified, in circuit, for 12v and was a bit of a mess. I was also

Cliff, you work very nicely. The winding is precise, the component position is clear and transparent. I hope the sockets don't block the heat dissipation. I congratulate you. -- Gyula HA3HZ

What is the command dmesg showing when this happens? Rebooting a Linux system often isn't needed. Just re-plugging in the device is good enough in most cases. -- 73 Lex

Hi Cliff, It's good to read that you have it working again.? You are correct that T401 issues should show up in the Audio Sweeps in the sideband rejection and opposite image rejection.? Hans does

Alex, 175 ma seems high. ?I would remove the 5BS270d and see if the current drops. ?An alternative would be to disconnect one of the two leads of L14. ?Also check if IC2 is hot. ?That is a

Nevermind! I found that I can order it from you, which I just did. Thanks. …doug Doug Kaye, K6DRK DMR ID: 3196950 doug@... 415.846.0940

JZ, I already discussed that topic. If what you quoted is true and that’s what I think, the receiver performance is no worse than predicted from the RF sweep trace. How big is the benefit? I don’t

Hi Evan, Thanks for responding. I may have found the problem. I thought of looking at the sweeps an hour ago while looking at the schematic, but thought it was time to check soldering once again for

It was showing 170 to 180 ma current before it went out. It used to be 150 to 160 before this episode. It still reads 170 now without computer interaction when powered on. My meter doesn't show the

Is the FT8 software showing an audio connection for both input and output.? Try switching between left. right and mono. I I imagine you've already done this) I would try reinstalling the

...when we listen at 14 MHz.

Hi John, I have to disagree with the invalidity of the BPF sweep.? Granted that it might measure total response as the receiver's sensitivity could change, the receiver is being adjusted to the

Since the input impedance response and bandpass properties of the Tayloe circuit change and slide along with the clock frequency, the self-test BPF plots we make with these radios are somewhat

Hi Cliff, Have you run any of the sweeps that verify the receiver is working? What about the receiver on CW?? Can you detect stations through the earphones? 73 Evan AC9TU