Hans, A little off topic here but what power out can you expect with 3x BS170 on 50MHz? I know QDX is not a 6M rig ( yet ). Would 1X BS170 be better than 3 (at 50Mhz) to lower gate capacitance? TNX! B

I found: https://hackaday.com/2017/04/28/low-cost-drift-buoy-plies-the-atlantic-for-nearly-a-year/ Also just googled ham radio drift buoy got numerous hits.... Bob WA1EDJ

Just starting my rev 2 QDX. In the past I think I remember some talk about some of the coils needing more or less turns than specified by Hans to be optimal. Did this ever get proven or should I just

An update on my experiences with the PLJ-8LED ebay freq counters. The first one was a blue LED. Only one available at the time on Amazon. As I mentioned earlier, it appears the VCTCXO is NOT a VC type

I got the PLJ-8LED freq counter recently. I started testing with a known accurate source and found the TCXO adjustment pot has no effect on the displayed frequency. Stop to stop - nothing. I measured

After reading the thread, I ordered one of these just to check it out: https://www.amazon.com/PLJ-8LED-H-0-1-1000MHz-Accessories-Laboratory-Industrial/dp/B08N46QHJM/ref=sr_1_5?dchild=1&keywords=plj-8l

Thanks Rob! I got a set of 5 from another guy. Appreciate your getting back to me. Bob WA1EDJ

I'm looking for some QRPLabs BPF's. Prefer unbuilt 20M but just about any will do, providing no trace or pad damage. All can be rebuilt to desired band. Bob WA1EDJ

Thanks Johan. I was thinking it was not as simple as just changing the menu frequencies and readjusting. I have 2 QCX's I've widened the filter on and while they do appear to have a flatter response,

After reading a few threads on widening the CW filter on the QCX, I've come up with some R and C values to try for an SSB bandwidth. What I'm not sure of is what frequencies the alignment menu items:

Dave, What board are you trying to place the TCXO on? I've added a few on: QRPLabs 5351A synth boards, QCX transceiver boards and the Adafruit and clone synth boards. It is a tricky operation that I u

Is the QCX+ TCXO only kit shipping from the US? I need only the TCXO kit, not the QCX+. TNX! Bob WA1EDJ

Applied 9.5V to my U3S. Killed the micro. That seems to be normal. This time the synth board got hit. Get error message. Since the synth has a LM317 to feed the 5351a, I'd think that would survive. Th

Is there a DigiKey PN for this TCXO?. I'd add one to my QCX too. Bob WA1EDJ

I use a TCXO on my QCX. I started with the supplied xtal and after all working I installed at TCXO from DigiKey. Off hand I don't have the PN but could get it if needed. It is a 3 X 2 mm SMD and a rea

Looking for a dead or damaged QCX for RX only purposes. Anyone have one they'd part with? TNX! Bob WA1EDJ

Graham, Well I found one problem with my test. I picked a synth board with no IC2 reg on it! I have quite a few of them in various configurations. No 3.3v to the 5351a. That would explain a lot. Does

That's basically the same sketch I used and it worked for the RTC's. What I'd like to know is will NOT having a xtal on the 5351A STOP I2C operation?

On the 5351a synth module, will the I2C operate with NO 27 MHz xtal? I'm thinking no but can't find an answer in the data sheets. I'm trying an I2C address scanner on my Arduino Uno connected to a 535

Alan, I'm only running at 13,555400 MHz. I use ARGO at the 20 sec mode for really high resolution measurements. I've compared to my quality HP counter and don't see the drift that ARGO show. Maybe onl

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