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In the QMX+ I just mount them face up with the washer as usual. In my QDXs I have experimented extensively with heat sinks and I found that heat was never an issue. I do not run WSPR, mainly

Are you using VOX? I had the same issue until I upgraded to latest firmware and back to cat PTT control. Chris, w0anm

I loaded 1.01.003 last night and ran the calibration routine. I thought everything went ok. I cycled power and started tuning around the bands. The first band I tried was 40 meters. I heard a group

KJ7RBS (I think) did yeoman's work in getting the QDX to work with VARA.? He suggested setting: Rise Threshold to 65 (default 80) Fall Threshold to 45 (default 60) Min. Samples to 120 (default

Darrell, Did it only happen this one session or does it happen every time you use your QMX in SSB? 73, BrianB N6CVO

Congratulations! -- 73, de BD8BTE op: Lun Yang

The bandwidth of an AM receiver might be 10khz, the QMX strips out all but 3.2khz of that AM signal. While it is harder to tune in with the QMX, if there are interfering signals within the 10khz AM

Nate, When Allison says a max of 16 volts, she means the power supply into the rig. Transmitting on 80m with the QMX from a 12v supply into a 50 ohm dummy load can cause peak voltages of more than 60

Paul, Okay thanks! Dave W6MQI

I'd appreciate some pointers to guidance on RF circuit design, especially power amplifiers.? Some sort of text book maybe. Chris, G5CTH

Dave, I have an old set of Radio Shack communications headphones that are mono. I use a mono to stereo adapter plug on it and it works fine. It's similar to this

WSJT-X has moved on to 2.8.0 now.? The 'improved' versions are 'authorised' as they are made by one of the developers as a way to trial additional features, some of which are useful.? That one was

Thanks again Hans for the great work on this radio and firmware! in addition to many US and CA contacts from my QTH in Minnesota, I’ve made my first ever QRP DX contacts. Madeira island on the first

Ahhh, so thus 50v divided by 3 or 4.... Giving 12.5-16.6V. Got it. So it would be OK for 20v IF you had a perfect output load matched to the transistor? Makes sense. Thanks, Gary! -Nate N8BTR

Martin, It is a modified version, (improved in some ways?). Try it if you wish although I would think it best to use the 2.7.0 version if it does what you want. Hamlib is here

Richard, I did this in QDXs with a Wakefield heatsink I drilled and tapped. https://imgur.com/a/Nq4dUIN -Nate N8BTR

The RF voltage swing on the drain of the part is nominally twice the DC supply voltage but could go higher with higher load impedances. 3-4 times the DC voltage for the drain breakdown rating is a

I’m using this mic and can confirm the wire color mapping is the same as in the video. Same jack configuration as the (tr)uSDX which I have used too. The speaker is loud but emphasizes the high

I did an outdoor test of the portable setup today with the aim of going up a local hill later.? As I chased an Italian POTA and 2E0XGO/P on G/LD-036, Melbreak, without much effort on my part spending

Can someone explain this? I'm trying to understand maximum values of RF transistors...and the RD16HHF1 datasheets I see don't say 16v anywhere. I see 20v and 50v ratings...and I see things about rules