I'm working on a similar project, but in my case it's an old Motorola Compa-Station (Motrac-based) on 10m and it uses phase modulation after the crystal, so a ProgRock should be a good substitute for

Robin: Thanks for the filter recommendation. I would need two of them though, one for TX, one for RX, and the freqs are significantly far from the common ham bands that I'd need to fiddle with compone

I know the crystal signal isn't a nice sine wave, but it certainly isn't a square wave with very steep rise and fall times. Both have plenty of harmonic energy, which is why the multiplier stage can t

I think it has something to do with that old Beatles song: Eight Days a Week". Bob M.

And, if they're metal, you probably should solder the two ground pins on the BNC jack in the upper left corner of the photo.

#40m #qcx #qcx40

Yes, you should get 5V out of the regulator with no load. There are often small (less than 1uF) capacitors on the output of the 7805 regulators, sometimes tantalum. These have a nasty habit of shortin

Looks like a bunch of nice improvements. From reading lots of posts here, it does seem as if a lot of people had problems with the 5k volume control lugs either disconnecting from the phenolic or losi

I know a lot of QRP Labs products can be programmed with a TTL-level serial protocol. The USB to serial adapter products that use a genuine FTDI USB serial chip seem to be the most compatible and reli

Also remember that the Heath Cantenna had an air vent in the top lid. The mineral oil and air would expand slightly when it got real hot, and the pressure in the can had to go somewhere. You don't wan

Most modern PCs have an electronic on/off button rather than a switch that interrupts the primary power. The PS has a 5V supply that's always on as long as the PS is plugged into the wall. This voltag

When you installed the LEDs, did you orient them by the flat along one side, or the lengths of the leads? I've had some LEDs where the two orientations differed. The plastic molding was done incorrect

Can you disconnect the secondary of T1 to check that 2.5V bias voltage? I don't know if the IC it feeds is passing that bias voltage to the circuitry to its right (on the schematic) but I suspect ever

I live in Hamden CT, about 35 minutes from ARRL headquarters in Newington CT. Several years ago they sent me an order blank for their Travel-Plus repeater directory CD. I filled it all in, including m

It's only a simple two-sided board. You can add jumper wires to the FET as needed according to the schematic diagram in the manual.

Start at pin 14 and use an ohm-meter to trace the circuit per the schematic. Move past the FET and trace every component. There could be a broken trace when the board was etched. Hans may also have an

If you're going to be doing ANY SMD repair, definitely buy a Chip-Quik kit. It comes with liquid flux, which you apply before removing the IC, and before soldering on the new one. As the old IC is alr

It was my understanding that he needs an X-ray view or track image of the synthesizer board, the one with the Si5351 on it, not the ProgRock board that it plugs into. If in fact his problem is on the

Hans, could you either add the TCXO connections to the schematic or add my diagram to the synth manual? Also, a photo of the ProgRoc synth board with the TCXO instead of the crystal. I have bigger ima

So the bigger question: after the blue fire, was the heat shrink tubing shrunken like you wanted it to be?

Could that "grass" be when the actual NMEA data is being sent out of the QLG1? It seems to last about 0.5 to 0.6 seconds and might be present while the 1PPS signal is high, but we just can't see it. C

#progrock #qlg1