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I am going to start building a QMX+. I was wondering if removing flux with a chemical is necessary? ?In all the builds I have done before I never bothered to try to remove the flux after finishing.

Just be aware that iFTX (at least as of 4 to 5 months ago) does not work quite like the FT8 developers designed WSJT. You may like it, I found it frustrating operationally. 73, Kevin K3OX

Hi Bill, The original post had a PDF attachment describing the experiment. I am re-attaching the original PDF to this post. Max-heatsink refers to the original post where the transistors were wrapped

Tony, Can you explain the meaning of these numbers? Does a lower number mean the hardware is better able to dissipate heat or simply has more thermal mass for the active device to heat? Any idea

Alf, Not much required to do the Si5351 https://sites.google.com/site/g4zfqradio/qrplabs_replace_si5351 Others have cut the IC pins with a Dremel-type tool or even with a scalpel. It is worth trying

Hi The si5351 is the faulty unit, tcxo is ok all the time, but Lo disappear when the fault occurs. By cooling down the si5351 it is ok again. This smd is too small for me to replace, I have no tools

Sorry, I just noticed you are talking about the plus, So it won't be the encoder body causing a short. -- 73, Dan - W2DLC

Hi Michael. When I had a blown PA output transistor, my 12v QMX was drawing a little over 200mA on receive/idle mode. So yours is behaving a little differently at 125mA receive current draw. In my

Great, thank you all!

Yes !!!! yahoo.com@groups.io> escribió:

Here?IVSHOWCO USB Camera Adapter for iPhone, iPad to USB OTG Cable Adapter, iPhone USB Adapter Supports USB Flash Drive, Card Reader, Mouse, Keyboard, MIDI...? | | | | | | |

Hello ! It doesn't work for me from ligthing to USB C, I would have to buy an OTG adapter if I understand correctly yahoo.com@groups.io> escribió:

I received an email from Hans (! Amazing customer service) that the online file was a zip file and that the QMX file was the uncompressed file - so my Mac had already decompressed the file for me.

Thank you, Greg, this helps a lot! Cheers, John VA7JBE

So, I put it on a buck-boost that could give me a better readout than the power bank on amperage draw. At idle, it's drawing 0.125A; transmitting on 20m, it's drawing 1.25A. At this scale, I'm

John, Just saw your 2nd post. I'm not an expert, but what you describe is exactly what happened to me on a first batch QMX+. Along with a few others I believe. I had mine checked and repaired by Jeff

There is no separate rev4 schematic - the rev3 is accurate, only one minor change on the ptt out jack for rev4. All of the terminals of L405a/b should show DC continuity to ground and the other few

I had a chance to open the enclosure and check the continuity on T401 and everything seems to be well connected.? All tests are still as before.? I'm running out of ideas on what could be

or bad coax and or connectors.

Damon, to do some investigation without damage of the BS170 you may feed the PA from a little AA cell in series with a 10 ohm resistor (see this thread (