开云体育

Mike, It will not disappear, R43 should be 120K which feeds into about 50 ohms very significantly reducing the signal. You will not see it on a scope because it is so low, just as you will not see

Anyone using Linux apps to key the QRPLabs transceiver? Linux Mint here.? I see several Linux apps for a laptop to generate code requiring a USB to DB9? converter cable + a simple isolating

I use DuPont cable wires wrapped in copper foil. Works for me.

I may be covering obvious territory, but is the resistor good? Continuity between IC3c pin 8 and the resistor? Continuity between resistor and BNC center pin? --Al WD4AH

Ive been using unshielded 6 inch dupont cables. I must not have read the instructions. No issues so far on U3S with 5w amp nor QCX.

I had a fairly lengthy post typed up and the forum ate it so I'll condense it down to: I traced the signal form the Si5351A pin 8 to IC3C pin 10 to IC3C pin 8. At each point I get about a 7V p/p ugly

Thanks, came off no problem, & looks better without it.

Keith, you might find swapping the kit 27 MHz crystal with a lower drift one might help. They are generally smt. I think Farnell stock Epson ones for a couple of quid. It’s worth searching .

All, This is now sold. 73 Keith.

Hi Keith again, Ah OK I will have a read of the manual tomorrow myself. Sorry if I have caused confusion. Good luck with it anyway. 73 Roger G4IUP

Hi Roger, The ProgRock is GPS disciplined. The QCX isn’t. Even running in WSPR mode, the QCX only calibrates once per frame whereas I believe the ProgRock is continually calibrating. At least,

Hi Keith, Just a thought, but why are you expecting the drift from ProgRock to be any different from QCX as it is basically the same circuit as far as the frequency generation is concerned. What about

Keith, Thank you for the reply. So it's not such a obvious choice as I had in mind... regards Alan

Hi gang, Mea Culpa! Mea Culpa! Mea Culpa! I believe I destroyed a perfectly fine Synth module... Question remains exactly how it happened???... Here is the story: As part of my multi-band 5W CW

Hi Alan, It’s the very very slight frequency drift that’s done it for me. For normal use, it won’t be even noticeable but when running as a QRSS grabber, a shift of up to 25Hz over the course of

A vaccum desoldering station helps..... I have one, many do not.

Ofcourse you can modify it, it just means unsoldering the band filters and capacitors And that fiddly T1 Transformer? as it requires more turns on all taps. But it can be done. If you are good at pcb

Seconded on the DuPont connectors - they came in handy when I kept taking my board in and out of the box for repairs and upgrades - I broke a volume pot, and later retrofitted the box with a MicroUSB

Hi Keith, Out of interest what limitations did you find with the QCX as an RX only? Back of the fag packet jottings were pushing me towards a QCX rather than the RX kit & VFO or ProgRock. (as long as

Hi The plastic tape is merely a packaging item designed to help avoid damage during transit. It is applied by the factory. You can just remove it. 73 Hans G0UPL http://qrp-labs.com