开云体育

Image Sweeps

Audio Filter Sweeps

Thanks, Cliff. You've been a tremendous help on this. Where did you find the heat sink you have on top of the finals? Wayne KB4DSF

Hans, The sweeps were terrible. And I have no audio out of the 1st QMX. I worked with John Zbrozek a good bit with the 1st unit and we got it that far and we decided that the PCM1804 was likely bad.

Have you tried the power boards one at a time from the old unit that does power up in the new QMX? 73, Cliff, AE5ZA

Wayne, There is just a hole through the plate to hold it in place and a foot that you can't see almost at the left hand edge under the plate the same as the one that is visible on the right hand

The BS170 (finals) are low power devices with a thermal impedance of 150C/W.? Trying to reduce the internal chip temperature by lowering the already low external thermal impedance is pretty

Hello Devan There's only one ADC on the main board which is the PCM1804. But I'd suggest first checking what you see on the RF sweeps (apologies if you've already posted that here, too many topics to

So I think the discussion about pin headers for the PA transistors is adventurous. The most important point with all devices QCX, QDX and now QMX is absolutely the use of a tuner. The antenna needs to

Good morning, I have received and built my second QMX according to the current build guide, and cannot get it to power on. I built it for 12v operation and I tried starting at 7v and then up to 10v

Adam via groups.io <qrp-labs@...> wrote: Nevermind. I had short on an RF port.

Hi Bojan Awesome Well it was all about romance. Marriage. Of QDX and QCX-mini. For whatever reason, I was determined to make it all fit in the same enclosure as QCX-mini. And use through-hole

Hey, Cliff. How did you mount the plate under your finals? Wayne KB4DSF

Hi Kees Hi hi, bandwidth and expertise? You should ask my family, how often I showered, shaved, even SPOKE to them in the last few months! It's by far the biggest project I've ever done. So yeah I

Hans, What a complete detailed response and education for everyone. I am impressed with your bandwidth and expertise relative to this wonderful QMX product. 73 Kees K5BCQ

Hey, Cliff. How did you mount that plate under the finals? Wayne KB4DSF

Putty can be configured to wait for carriage return to send message.? Just set "local line editing" and "local echo" to "force on"?in the terminal options. -- Cheers, Chuck

Hans, ok, I understand your point of view. By win-win I meant a better and less risky MC supply. A bit more mAmps doesn't hurt much either. GL with your upcomming new challenges. 73 Bojan S53DZ

Thank you, Hans, for your detailed reply. For my own part, I've been reassured as I measured my 9V QMX build. ?I posted the scope screenshots in the hope of sharing that reassurance with others and

TNX Ross! That would be really helpful. I have an unbuilt QDX R2 that I can build up as an M. Just leave out the multiband stuff and go for 6M I'm trying to get on 6M now with a TenTec 1208