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Hi 1- don't use termal paste, your QMX won't work 2- use termal paste, it will improve heat transfer drastically both are wrong 73 & HNY DE muhsin TA1MHS

That sounds like it could work as well as anything else. Someone here, which link I couldn't find, did some tests that showed the leads dissipate a lot of the heat, so I always add more solder to the

My assumption is that the Chinese manufacturer does not install original chips, but copies that in many cases do not work well. 73, Zrinko Ivan, 9A7AM

Given the excess solder in my QMX+ heatsink area, does anyone have suggestions on improving the heat transfer?? My best guess is to use thermal paste. 73 Evan AC9TU

Sorry if it has been said but how much is it per person? - Nico [email protected]> wrote:

Hi Halil. Did you remember to install the jumper behind the BNC? See page 37 of the assembly manual. It is easy to miss. 73 Roger 8P6RX ?Get BlueMail for Android ?

Hi Daniel; I shared the measurements again by providing Dummy Load. Thank you for your support.

It's remarkable that you have had three PCM1804 failures even while using antistatic procedures. I built a QMX and a QMX+ without using any precautions, and did not have a chip failure. The PCM1804

Halil, You need a dummy load to properly begin analyzing the problem. Your SWR protection has been triggered, so the radio won't transmit until that is reset. -- 73, Dan - W2DLC

I have assembled my QMX + device, all visual functions are working. but SWR is almost above 10 on all bands. I can not listen at all. There is no dummy load at the moment, it is only connected to the

just extending the courtesy of 'closing the loop' on this little misadventure... With a multi meter i was seeing 43 ohms on pin 3 (output) of the 7805... tried lifting the cbt3253 Vcc--no change. I

Scott VY1CO via groups.io <scott.vy1co@...> wrote: Copying the advice I received in another thread (same thing happened to my QMX) -- see the resistance between the 5V line and

Shirley Dulcey KE1L <mark@...> wrote: Thanks, Shirley. Digikey's shipping cost to Poland ($30 USD) is crazy, so I'd want to avoid that if possible :( Mouser doesn't look much better (20

Too much current is being drawn through the 5V supply, indicating some component is partially shorting, possibly internally - most of the receive ICs can do this, and they run off the 5V supply.? The

Well you know there is too much current draw on that 7805. Real hot, look for a short you created. Start with DC power off, and check things with your dvm. I remember damaging one project late at

Don’t feel like the Lone Ranger. I just fixed my QCX that had a broken solder joint. Later that night I decided to see what it could do. Late at night bad. The coax I connected didn’t connect to

I would like to be included as well. Rhett -KB4HG [email protected]> wrote:

While waiting for some more qrp parts to arrive for another QMX presently in dry dock, I thought I would build the original QCX I received from Japan some time ago...I had a few puzzling moments in

Colin, thank you.? I quickly got it up to 5w on a 13.8vdc supply.? I think I'll stop adjusting it there.? I don't want to "work" the windings too much to the point of breaking them.? Howard,

Count me in! John Higgins. KQ4FT [email protected]> wrote: