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Hello Mark Fixing the accuracy of the RTC is again something on my to-do list. The RTC runs from the 32.768 kHz crystal and like any uncompensated uncalibrated crystal they can be off. I will include

I'm using a QMX+ with the CR2032 installed and "QMX+ RTC" selected. The problem is with the accuracy of the clock when the unit isn't switched on. AFAICT, it's pretty accurate when the radio is

James, there are pros and cons for both. Searching through the forum you will find some discussion. I wish you success for your work and hope to read good news from you. 73, Ludwig

To be clear, it looks like Q507 is ok but I'm not sure because So Q507 maybe not ok or something around Q507 is wrong. If voltage at G and at S are the same, across a well working Q507 no current is

I use 99.9%? IPA (not the beer!) and an old medium toothbrush to dissolve the flux away. While the area is still wet I lay two layers of kitchen roll over it and rub over the top of that with the

Hi Paul, I initially built the 9V version of the QMX. All my power sources are either 13.8V or 12.8V. My thoughts were building the 9V version with a voltage regulator inline of a dedicated power

Hi I have used this but CW only, The KX3 has superb power control 73 Andrew

Just curious, why would you replace it with a smaller one? Are you trying to make space for something else by shrinking the LCD?

Hi Amazon do leaded capacitor kits, build up some stocks. 73 Andrew

It’s all interesting The trouble with assuming temperature = heat flow is that actually temperature is just heat and without knowing the magnitude of the flow is a bit of a dead end There is a

I agree with Stan's assessment. When I had a blown PA transistor in my QMX, the rig (12v) was drawing over 200mA during receive. I didn't have to remove the Heat-sink washer to find the bad one. It

Based on the post’s you referenced, I’m going to perform a “sanity check” on the LPF considering that L507 was found open. I can now invision a path through Q507 and the BS170’s with there

You will need a high band QMX+ with 6m to do transverting up to 2m and 70cm.? Failing that 10m had been popular in the past. There are many reasons you won't want yo go lower. When I played with them

Hi Greg et al John VA7JBE's description is also what is happening with the QMX+ I have just completed.? This is my second QMX+ as the first one didn't work due to faulty ic's in both the tx and rx

I think it mainly depends on what you want to use for a power source. 9V will use ~1.3A in transmit, 12V will be under an amp (working from memory here!) 12V is tempting to use a nominal 12V source,

Well I'm back; Ludwig, since we determined that Q507 was good (until I broke the legs off), is there anything else that I need to pay particular attention to, to determine why there is no output

Tony, I wasn't sure if you were measuring the a ctive device, so higher temps meant poorer transfer *to* the heatsink, or measuring the heatsink meaning higher temps might mean better heat transfer

This looks like the one, Nate -- thank you ! Bill? W3WJ

Mine looked like that too. ?I couldn’t get a reliable connection to my pc until I resoldered those pads. ?Just used a fine tip iron and took my time.

There's no free lunch. Power out < Power in V*I out < V*I in The 12V battery would need to sustain high current for the buck converter to achieve 20V at the current required to amplify the signal to