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Hello group, i have completed the kit with the 5w HF PA all working ok. I have done the mod to be able to switch of the Amp off from the left top front switch. On power up with amp on all is ok but if

Hi Andy, I just finished assembling an OCXO kit and now testing and calibrating. ?Like others, I'm finding the heater is pulling WAY too much current when started cold so I need to swap out the stock

I would have thought the frequency counter would use the 20MHz crystal, so it would not be affected by changes to the 8.5 setting. Rich

Hello, I use solder Pb38 / Sn60 / Cu2, 0.56mm (0.23i), a 50W soldering station with 330 ° C (625 ° F). With that you can solder everything on the QCX. At higher temperatures, the tin will flow a bit

Chris let me know if and when you TX on 136khz again...will listen Vernon - VE1VDM Sent from my Samsung Galaxy smartphone.

Chris Wilson 10 September 2018 If an exciter transmits on 275.1kHz into a Class D amp where the frequency is halved, but WSPR-X is NOT set to use the new X2 function what frequency will result with

The temperature will depend on whether the solder is lead-free or not. Lead-free needs a higher temperature. -- 73 Richard G4TGJ

My iron should be around 370C but I don’t panic about the exact number. What matters is the iron’s ability to stay at the necessary temperature and deliver the power to the joint. Don’t be

I think the AUDIO2 path to the microcontroller is used to measure the signal level for the 8.7 adjustment. From looking at the schematic, AUDIO2?is going to read the signal at the wiper of R27 and

I've done that but I'll try it again. Thanks

With the power off use an ohm meter and check all the windings on T1.? Be sure to measure from solder pad to solder pad and not the wire ends.? What you are seeing is what happens when on of the

Just for full picture - having Clock kit, FW ver 1.01, delivered week ago... Maybe I will try to go to some other "border" of LOC to see if calculation will be wrong also or I will try to find

Alan, W3AL The main part of that Wall Wart Tamer is the large capacitors. I have had good luck taming old PC power supplies by removing the 4700 MFD caps from a dead power supply and adding them to

Ted, You might want to consider this kit: https://www.qrpkits.com/wallwarttamer.html I built one and use it with an old computer power supply and it provides clean stable DC output. I even put it in a

Probably the best place to start is a thorough and close up examination of the PC board looking for cold solder joints or bridges between traces. Reheating any questionable solder connections

That is interesting as I was about to build a dedicated variable PSU for the QCX I am building using an old Dell laptop 19v SM PSU. I was going to use one of those cheap DC - DC converters with an LED

Hi Al :), Glad to be helpful. It took me a bit to figure out what was really happening.... Scope, filter caps, filter on audio output, etc. Later I realized that I have a spectrum analyser which also

I have an idea that there was a problem with calculating the locator in some circumstances but I thought that it had been fixed in a firmware update, although there's nothing to indicate this on the

I agree. Get the genuine Kester solder - the Chinese solder is junk and should not be used for PCB work. -- 73, Bernie, VE3FWF

Review the solder joints again with a magnifier or eye loop and touch up any suspect solder joints.? -- 73, Bernie, VE3FWF