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Greetings from Budapest, l am planning to do some portable operation this year with my QCX. I want to put it in a case together with some batteries, my thoughts are to buy 3 of those mobile phone

Pat, You may search the past posts on this subject. Apparently care must be taken when plugging in the GPS unit as it will trigger the transmitter and since you had no antenna or dummy load connected

attached Pat, Another who has been caught out by what seems to be something that is not emphasised sufficiently. This is the last of many posts about the problem.

Jose, Love your version of this design. Will you consider sharing the design files? I will be ordering a printer end of the month. Just got my 20M kit so I have time before a case will be needed.

Hi Bill I think that your estimates are in the right ballpark EXCEPT for the LCD backlight - the current consumption of this backlight should be around 30mA (NOT 150mA).

Good afternoon all, I could use some suggestions on what might have happened that caused Q3 (and probably others) to let smoke out.? The build process on this 40 Meter unit is a longer story, but I

Ted, Sounds like a setting condition with the tone on receive. Check to see if you programmed both receive and transmits tones. ?In most cases you just use the transmit tone. ?If you had a tone on

Check your power supply and also SWR into the antenna. Try low power if it is acailable.? 73LarryKB3CUF.

I know this is the Qrp labs group, but I am hoping to draw on your knowledge with an issue I’m having with my new rig, I’m totally lost I just got my FT991A, working fine except for use with FM

Hi Alan, I get 0v at the other end of R42, which is the drain of Q4, with 5v on the gate with Key Down Tx mode.? I have checked connections in this area and all seem to be good.? ? Please note the

Hi Mike Sounds like a fault somewhere... see the trouble-shooting guide http://qrp-labs.com/qcx/qcxtrouble for signal tracing description. The QCX has a low noise front end and plenty of gain (perhaps

The receiver appears to be insensitive, taking some measurements, a signal of -70dBm produced 10dB signal to noise, the signal generator is a R&S CRTU-RU a Wandle & Goltemann SPM31 monitored the AF

I do have 5v at the base of Q4, and at the Kent Q6 is not being turned on by Q4. There may be a bad connection on Q4 or R42. One end of R42 is at the base of Q6 11.4V, what is the voltage at the other

Hans, You get a Hi-Five for the Hi-Resolution image you posted, And my eyes, say aye, aye! --Al

Thanks again Alan G4ZFQ.? I do have 5v at the base of Q4, and at the drain I have 0v both on key down.? However, I do not have voltage at? the collector of Q6 (voltage is 0v).? ?The base is 11.4v

Hi Hans, Thanks for that info. I’m in Budapest for another couple of weeks before returning to the U.K. it would be nice to meet up with fellow QCX builders here if only to take some pictures and

Ok, made some more progress. Fed the receiver with a 40m signal from a VFO I have, and changed the LO to suit. Got super audio tone that varied with the VFO!. BUT. The level on IC4 pin 1 is much lower

Mine does the same - Even giving it 11.5V from a good PSU, I get the three flashes. I’m able to program it successfully with the four flashes after each button press so I’m not too worried. 73

And I should have said, I'm attaching the antenna so that it bypasses the bpf and tx/rx switch. Roger --- ** Roger Hill **

Ok, here is where I've got to, trying to debug my receiver. On IC2, pins5,6,8,9 I see the 10.138 MHz signal. So that's good. I have not yet tried injecting a strong signal at the antenna input, but