Very nice. Reminded me of Christmas Eve 2020 when I built mine. Sadly, that particular radio is presently broken after a short circuit was created between the drain and gate of one of the PA fets....

On the little Settings gear you can slow down the video. Look on the bottom edge of the window, near the right hand side.

QDX is built. Rx /Tx working. RF output slightly low: 9V supply, no reverse polarity protection diode (yet): 20m 4.5W Est. Efficiency 66% 30m 4.5W Est. Efficiency 54% 40m 4.4W Est. Efficiency 63% 80m

But this video has wiring and some impressive repair technique, when there are not a lot parts in your junk box. It is mostly wordless workshop, but you can turn on English subtitles

If it's legal in your country to work certain countries then by all means do so. If have your own reservations then spin the dial. Simple !

Hello Martin, I had ordered 2 chips with firmware. That was actually unnecessary because you can access the latest firmware and program the Atmel. The chips together cost $17.58 = €16.27. FedEX

Just a bit off my own Topic Have a look at your QSL cards especially the older ones and try to find out about the reason for many special callsigns nowadays and then rethink if our hobby really is off

Hi, Martin, The third invoice arrived yesterday. It follows the same scheme as the two previous orders I placed at QRP-Labs. In that respect, there is no irregularity. :-) All three went through

Hi Jörg, when did you get the invoice ? I got my parcel without any TNT invoice in the end. For the high transport fee TNT should be able to indicate to the customs how much was paid as they are the

Excellent, so the test technique is working - at least for the high level signal at IC10. The 10-15mV is the noise floor - not a problem of course - but the 20-35 is your crash! Can you see it on IC10

Large cap...thanks for that great idea, Jim. Yeah, a 10uF can be pretty brutal, but it will do the job! I've often wondered if a quick "slap upside the head" would shock a cap into good behavior; I've

Yes! I was wondering whether I should introduce that idea. It's really good, because you get the actual sound, and the high impedance input doesn't quench the signal. I chose not to mention it only

I agree with everything said about Siglent 1000 series scopes. I purchased a SDS1202X-E to serve as a replacement for my antique but still going after 30 years or so Tek 465. Gave the Tec to a

Gary K3WK, Thank you for the explanation. The fact that it is voltage and not power quantized and that power is voltage squared does explain some of the difference. I looked up reducing quantization

On Thu, Mar 17, 2022 at 05:07 PM, Dan W6AZI wrote: voltage dynamic range of 100:1I believe Dan W6AZI is correct. Recall that power is proportional to the square of the voltage. Evan AC9TU stated

Evan and Dan: I sensed that this would work, so I got out my Rigol 1202Z-E 200 MHz scope and connected it to my TinySA low frequency output. I set the TinySA to result in a full screen waveform and

After writing my last reply, I realized that I did not explain the rationale. The requirement is that if the carrier is right at the maximum value (256 for an 8 bit ADC), then the smallest signal

Dan, I believe that the math is: db=10log(po/pi) For 8 bits the maximum value is 256 so it would be 10*log(256) = 10 * 2.408 = 24.1 DB For 40db = 10log(PO/PI) or 4 = log(po/pi) po/pi = 10^4 =

David, Had a connection problem with groups.io so my answer may not have posted. No, grounding the cap to another point made no change, so the connection to ground plane is good. Will try battery test

I joke that I'm counting on that ;-) I work in IT with a lot of UNIX background; my pension matures in 2037, just in time for post retirement contract gigs... If I make it that long...