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Jeff, I would do one test before ordering the power supply replacements. Verify that you do not have a short to ground on the 3.3-volt and 5-volt rails with the converters removed. If there is a

Hi Jon, As Tisha suggests, the 9-volt battery will limit the current to about 1.5 amps.? That would be OK for transmitter tests, but a lower current limit is better for the initial power-up. I use

If you’re going for the 12V build, get one of these: https://a.co/d/feyYo9I

Thanks Evan. I see the issue now - I’ve had a failure in the 5V converter board. time to go to the parts page and get some replacements. Thanks Jeff

Get well Hans and take care of your family! Best 73's JR

You could also just use a 9 volt transistor radio battery. -- Tisha, AA4HA

Hi Jeff, Here is the QRP-Labs guide: https://qrp-labs.com/qmx/qmxtrouble.html 73 Evan AC9TU

Thanks Adam I'll fix it 73 Hans G0UPL http://qrp-labs.com https://buymeacoffee.com/g0upl [email protected]> wrote:

??????????????????????????????????!!!!!!!!!!!! Roy, could you tell the parameters? Is there the type on the case? 73, Ludwig

Hi All. After 8+ months, and 2500+ QSOs, a sad day here today as my QMX will not power up. Pressing the left encoder doesn't turn the rig on. I have taken it apart, and not seeing anything obvious,

Hi Evan, A few months ago you had observed that the BS170 failure rate on QMX was far less than that on QDX, and had suggested that it was testimony to the efficacy of wave shaping on QMX preventing

Hello, I recently ordered what would be my first kit and have read some on making sure I use a current limiting power supply when testing.? I was wondering if others could recommend a supply.? I

All, The issue with the QDX is it does not have a key shaping function.? Because of that, there is a very large voltage spike at the abrupt end of the transmission cycle due to the magnetic field

Okay, what do I put in the "saved sessions" box to get the QLG2 to work on PuTTY? -- 73 Karl KI4ZUQ

Hi Roy The photos are on here: https://qrp-labs.com/qmx/qmxtrouble.html Note that Rev 2 and above boards already have the 5.1k resistors. 73 Hans

I'd like to add the 5.1k resistors to my V1 QMX, but for some reason the "attached photos" of mods that folks have done in this thread are not visible to me. Can someone post a photo of their

I bought the TN0110s from Mouser. TN0110N3-G-P002 IIRC there was no real difference in the suffixes that mattered. Same leads, etc. I've never seen anything official on putting Zeners on the finals

Roy, Neither Ludwig nor I can figure out where enough power was coming from to heat your BS170. You saw approximately 100mA excess current in RX. Your diagnostic screen showed 0.6V applied to the

Just tested and no, with firmware 017 RTTY still does not work. Also Olivia and Contestia do not work either. Back in firmware 006 they all worked. 73, Cliff, AE5ZA

Was this issue with RTTY in fldigi not working on QMX ever fixed? I was playing around with it appears to transmit for a little bit then stops. I have tried with and without the TXid.