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Only reason for a voltage reducer is based on what Hans has said in the build manual regarding nominal voltage: "Operation at more than 12V will reduce the protection safety margin available in the

This from AliExpress et al. $16 and is fully assembled, adjustable, and feels superb.

No extra bits like voltage reducers or resistive bridges needed!

There's a good solution hidden in the menu. First, set Protection:Tune % to something like 30% or 40%. Exit. When you need to tune, go to Hardware Tests:Tune SWR. Press once more and you will have a

Thank you all for your kind help and inputs. A good friend happened to see my post here and offered to send me a piece of that exact wire that is supplied with the kit. Hopefully, I will share here in

I have two of those SS paddles. Really nice for portable operation. There is a newer version with knurled adjustments. I Have since bought a pair of

By fixing the VCC issue do you mean so it's totally normal, no variation with the good PC#1? I was hoping the replacing of the IC might help that. 73, Cliff, AE5ZA

That should be qth.com

Posted on qrp.com

Hi Corbin, except from the controls board I know two parts are involved in turn on and off: Plug-in PCB#1 (schematics page 1) and the mainboard (schematics page 2, around JP101/JP102 and JP201 and

I have a QMX that I built from kit and it has a tendency to turn itself on and off (and anything else that S304 can do like switch modes or bands). The important piece of information here is that it

I own a QDX Mosfet PA mod kit for my QDX and have not used it yet since I have never burnt my PA. Do you think this more sturdy PA could be used with the

Cliff, replacing the IC without fixing the VCC issue before is a bit dangerous.

Cliff, You should put the radio into IQ mode and let Audacity process the incoming I and Q channels off of USB. From what you said about your sweeps, you may already have the answer, though ;-( The

Try running the LPF sweeps for the two bands that are giving you problems, and see if they correspond to those in the Operating Manual. Having said that, many have noted that the SWR sweeps aren't

Mitch, did you read this ( /g/QRPLabs/wiki/36874 ) and this ( /g/QRPLabs/wiki/36857 ) ? It looks like the PA is working. Here (

Thanks all for your help and information. FYI:? I received the above listed reducer from Amaz## and it allows you to lock the max voltage.? I experimented with my variable power supply and for

John, RF Sweeps and AF sweeps are pure garbage. No scope here. Using Raspberry Pi for testing. Regarding using Audacity just run audio output from the QMX into Audacity? I thinking I'll just

Excellent Ludwig, I was looking for this diagram but couldn’t find it. Thank you. Tony wrote:

Sorry, I made two posts and with this three in a row.