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Hello all,
I have a 40m qcx+ and a qlg1, both working great together on wspr for several years now. Well, that until I went ahead and put my qlg1 in a new enclosure, on top of that I removed the 3mm LEDs (attached to the board) and replaced them with 5mm LEDs attached to longer wires so they would attach to the enclosure. On first test the qcx+ and qlg1 talk to each other fine, the qlg1 locked on satellites and all, but I noticed that the qcx was not outputting any power. The qcx+ transmits perfectly fine without the qlg1 attached. I obviously broke something, however I am not sure if I broke the qlg1 or the qcx, do you guys have any clues? Thanks

On Sat, Sep 2, 2023 at 05:18 PM, Fend Ercin wrote:

Hello all,
I have a 40m qcx+ and a qlg1, both working great together on wspr for several years now. Well, that until I went ahead and put my qlg1 in a new enclosure, on top of that I removed the 3mm LEDs (attached to the board) and replaced them with 5mm LEDs attached to longer wires so they would attach to the enclosure. On first test the qcx+ and qlg1 talk to each other fine, the qlg1 locked on satellites and all, but I noticed that the qcx was not outputting any power. The qcx+ transmits perfectly fine without the qlg1 attached. I obviously broke something, however I am not sure if I broke the qlg1 or the qcx, do you guys have any clues? Thanks

Fend Ercin: If both units work fine by themselves, it would seem that the problem is with how you connect them together.? Check that the 1 pulse per second (PPS) and Receive Data (RXD) from the GPS receiver are working.? The PPS is a 100mS positive going pulse each second.? You should see a brief "flick" if using a DMM or similar each second, at the same time as the green LED on the QLG1 flashes.? ?The RXD input to the QCX is a TTL level serial data stream that will show a varying voltage of around 2.5V when data is being sent.? It may be that if the PPS/RXD data is not changing state correctly and so holding the QCX processor in an invalid state and not going to transmit properly.? There cannot be too much wrong if the units work fine by themselves!

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Peter Lee
G3SPL

As the GPS inputs on the QCX are re used paddle inputs (IIRC) pumping the data stream in there in normal TX/RX mode will lock the CPU up if it doesn't enter Practice (TX disable) mode first

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The Only times GPS input is really 'welcome' are calibration menu (oscillators) and WSPR etc beacon modes where Paddle etc. are disabled

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This is well covered in the manual ?

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If you aim for a 1 box unit add a double-pole gold contact (ultra low current) toggle switch that interrupts the PPS and GPS data lines whne they are not required

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Thank you Peter and Bruce for the replies. I double checked my connections and cables going to/from paddle and PTT, they looked fine. Then when I got rid of the 5mm leds (went back to 3mm) everything went back to normal. I noticed that with the 5mm leds the combination of QCX+ and QLG1 were drawing twice as much current as with 3mm leds. I am guessing maybe the QCX or QLG were going crazy with the extra current draw from the PTT port. Thanks again for your input, I am happy to be back in the air.

On Fri, Sep 8, 2023 at 02:24 PM, Fend Ercin wrote:

Thank you Peter and Bruce for the replies. I double checked my connections and cables going to/from paddle and PTT, they looked fine. Then when I got rid of the 5mm leds (went back to 3mm) everything went back to normal. I noticed that with the 5mm leds the combination of QCX+ and QLG1 were drawing twice as much current as with 3mm leds. I am guessing maybe the QCX or QLG were going crazy with the extra current draw from the PTT port. Thanks again for your input, I am happy to be back in the air.

Fend.? That was very strange.? I cannot see how usingn 5mm LEDs can cause such a massive increase in current consumption!? After all, LED current is decided by the series resistors regardless of size of LED.? You must have had some sort of wiring error, I think.? Anyway, I am glad you fixed it now!
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Peter Lee
G3SPL