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The Backlight only need '12v' power applied to come on. Most of the set runs on 5v via a regulator - but not the final few Audio OP amps which will generate some hiss.. Perhaps you ruined the first

Next you should probably check for continuity on all pins between IC2 and the LCD. Those are : IC2 LCD 2 11 3 12 4 13 5 14 6 6 27

Tiny SA also has a 20db LNA. If you accidentally leave it it on then you'd exceed the input spec, so -25dbm should be your final target just in case. -- - 73 de Andy -

Questions / statements on this design. First one is how the? drafter of the schematic - not the original designer came to? his Av? results For instance the? input transformer has a voltage gain

Hi William, The RF sweeps combine the LPF and the BPF (L12 and one of the selected capacitors).? The most impact is from the BPF.? If the LPF is correctly built, it will be significantly above the

Thanks to Jeff, W1NC for the great job repairing my builds of both kits.? I didn't believe the quick turnaround and how reasonable the cost was.? He will even throw in a tactful appraisal of your

OK, there is more to this story.? This was a functioning QCX,? but it had firmware version 1.00g.? I in my infinite wisdom decided to upgrade the firmware my self rather than just buy the

Hi! Apologies for inexperience and eye sight too bad to read all these messages... Brainstorms-- 1. Optocoupler with a long USB cable? [image.png] 2. Smoke alarm? <grin> 73 Paul KY4XJ

I am researching a low-power-on-one-band symptom on my High Band QDX, Succinctly, the power out was measured into a dummy load via a WM-2 and the rig was powered with a 5AH SLA bucked down to 12.0

Hi, yesterday I ordered a keyer kit from HamGadgets. They actually had reasonable shipping, $17 compared to $30 to send only the chips. Everything seems to be included in the kit and it should

Attiny85 chip very affordable anywhere and you can get the software from github. https://youtu.be/iYSalPFrX8k?si=kV4VxUCQ5FK1BPJ0 -- __________________________ .----------------. .----------------.

It's been mentioned many times in this group. I have a power cord with a buck converter to keep my 12V QMX fed with 11.5V. Brian n1bs wrote:

I’m surprised more people haven’t mentioned this… But if your QMX is built for 12 V you should never apply more than 12 V. If your QMX was built for 9 V you should never apply more than 9

OK! That's great news, Jason! Congrats on the repair and VY 73 OM. JZ KJ4A

Lo and behold, of course the back cover didn't fit thanks to the diode, I knew that but didn't remember when tacking it on.? So I took that off and put another on closer down at board level.? Since

John, got some ICs in and did the fix tonight.? If you wouldn't mind glancing over this and giving me some experienced feedback before I power it on again it'd be much appreciated. Masked it off

Hans Hi Using 5 Volts (you can not blow anything :) ) from an USB and no LPFs no BPFs (bypass 7805) I tested 2200m, 630m, 160m, 80m, 60m, 40m, 30m, 20m, 17m, 15m, 12m, 11m, 10m and 6m on transmit

--Ooops, the power meter was between the QMX and the Tuner Chuck, W5USJ EM22cv, Rains Co., Texas

Evan, I had Vcc at 9V this last time. I think the power with WM-2 and dummy load was about 1.2W Next I switched to antenna with tuner in adjust mode. The bridge is about 1.5:1 SWR. The failure

Thanks, Evan, I do have two dummy loads, the larger of which can handle up to 150W.? So I'll plan to build either the Salas or Hayward 40dB pickoff and follow it with a step attenuator. Eric