开云体育

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

Hello Bojan Operation of the volume control is a known firmware issue I need to address. Yes one could have designed it with a single SMPS regulator, at the expense of higher supply current. Though

?I use two rows of 6 machine pin sockets on all my QDX and QMX and 4 pairs for the BPF caps. See attached HB QMX prototype. 73 Ross

Not to mention that TRUE RS232 levels swing + and - at those higher voltages.? So your 6V RS232 logic is very likely switching between +6V and -6V. There is a good explanation here:

Have you tried *Termite* ?? Current version is rather old and may even I have is 3.4: https://www.compuphase.com/software_termite.htm Very simple terminal program with a separate "line input with

Hi Hans, I see my QMX as a very well thought out rig. Works nice. FT8 and CW. I built it for +12V. But the "too" small PCB means there is no place for an additional dedicated GPS connector for

Question answered.? Per Hans, pretty much any SMD 10k resistor as long as it is 0603 size.