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The main question Allison is do you agree with the splitting of the second feedback resistor as I did to do the maths.? ? Indeed for the? AD 8009 the datasheet? recommends? about a? 50R resistor

Thanks Dean ! OK, it sounds like a linear supply is the way to go.? I have the parts to build one with the possible exception of high capacitance filter caps.? ?How large should the filter caps be

Hi Baab, Firmware 017 works fine for me on FT8CN 0.92. I'm using it right now and it has transmitted just fine many times in a row. I don't recall Hans mentioning fixing anything related to this in

Thanks Dan, I will double check those things.Doug. WX7J?Sent from my T-Mobile 5G Device

how many amps should the diode be able to handle? My regulated power supply shows about 0,8A during transmit on 40m. Is a diode with 1A rating sufficient? 73 OE6HKE

There are some good quiet switchers out there, but there are a lot of noisy ones as well.? You'll never go wrong with a linear supply.? They are inherently quiet.? You won't need to mess with any

Doug, those pads are reserved for the TCXO board. The fact that the noise decreases when you touch them is an indication of something. Just not sure what. It could indicate a bad solder joint on a

Thanks for your reply Ron. It doesn't seem to make a difference.?Sent from my T-Mobile 5G Device

Doug, I see you installed the AGC option. If that is turned on, try turning it off and see if it makes any difference... Ron

Dan, I only notice it decreases when i touch the empty pads next to the 27mhz crystal.? Did i not install something i should have??DougSent from my T-Mobile 5G Device

Hi Steve - it was just powered from the PC via the USB port. Peter

Doug, do you notice any increase in volume of the noise when you touch the case or other object, like the key, that's attached to the QCX? -- 73, Dan - W2DLC

Burt: I had the same problem as yourself. Check the tab soldering on the large MOSFET Q507. That is a pre-installed unit and on my board the tab was sitting above the circuit board by about 1/2mm and

Hi Todd, Dave I will clarify on the web page. The assembly instructions for Rev 3 are the same as for Rev 2. It incorporates the changes made manually on Rev 2 PCB's and a couple of other changes to

Hey Dave, I just received my 2x QMX this AM, and had the same question. ?I assume we would use Rev 2 instructions but I’m waiting to see if someone answers here. Todd K4MSW

Not on a QMX, rather a QDX, I found a small bit of machining swarf (the "metal sawdust" from machining) jammed in the female slot where the top an bottom case join, preventing a fit.? The bit was

Good evening everyone, I have the same problem as Burt, but I bought the high band QMX already built, I did a few CW QSOs with friends nearby and everything was fine, then I transmitted for 10 hours

Might be a winding issue. I will perform the precious suggestions and if necessary , rewind the transformer and see what happens. ? Those transformers. What a blast! Thanks John, Burt K4SRQ

OK. Your screen shots all look good * except * for output power and SWR. Is there a chance you have swapped the primary and secondary windings on T507? That would block RF output and mess up

Hello to the group. I have a functional 20 Meter QCX mini, that seems to have a buzz sound on the input but seems to be present also on transmit. My other radios are quiet on 20 meters with the same