Excellent ! This reminds me of a story told by Bob Gobrick, WA6ERB/VO1ERB(sk), who was a well know QRPer and one of the original organizers of Four Days in May. At the first FDIM back in ~1996, he sho

#qcx

Ted : The simple approach that I have used to deal with these massive WSPR .csv files is to pre-process the file on a Linux machine to extract the relevant data into a new file, discarding all of the

#qcx40 #wspr

i have created a new group on Groups.io dedicated to Amateur Radio Pico-Ballooning. https://groups.io/g/picoballoon Hans has been extremely gracious in allowing a lot of off-topic pico-ballooning disc

Scotty : One option would be to install a 33 pF cap at C17 and then tack-solder a 4.7 nF across it on the bottom of the board. That should be close enough. Michael VE3WMB P.S. If you have the means to

Yes that would work nicely. That would be a simple way to get both inside and outside temps. As I previously noted, the precise timing of WSPR makes it easy to multiplex telemetry within the time doma

Hans : That is excellent ! Does your telemetry protocol have any spare bits for encoding additional telemetry ? If not, then because the timing of WSPR transmissions are so precise you could possibly

It has been interesting to monitor the progress of U3B-25, since its launch on February 28th (yup that is when it was launched, seriously ! ). I have been amazed at how the path of the jetstream has c

That's funny. When I read the title of the posting I was expecting it be a Turkish language newspaper. I wasn't expecting Chinese so I did a double-take when I saw the attached photo ;-) I can actuall

I did a bit of experimentation and it seems that WSJT-X will actually decode WSPR signals that are within 10Hz of the stated top and bottom of the 200 Hz WSPR transmission window, so in practice the w

On Tue, Jun 4, 2019 at 04:15 PM, Alan de G1FXB wrote: Geoff

John et al : In the "letters from our members" section of the April 2019 QST there is a suggestion for PC clock synchronization when you don't have Internet connectivity and NTP to keep your clock upd

Wow ... U3B-25 completed its 3rd lap of the globe ! This thing is the Energizer-Bunny of pico-Balloons ! Congratulations Dave. Cheers Michael VE3WMB

And I just found the following : https://www.active123.com/419D340G-Premium-Acrylic-Conformal-Coating-Prodview.html which is probably an even better choice as it can easily be sprayed on. Cheers Micha

Related to this topic, I just by chance found something from MG Chemicals that might fit the bill. It is called Super Corona Dope. See attached file. Cheers Michael VE3WMB P.S. I would be tempted to t

Halden et al : On the topic of 30m + 20m antennas, one thought that I had was to use two separate antennas. This would of course add weight and may not prove worth it in the end (VE3KCLs setup works,

At the risk of prolonging this thread, I will reluctantly add in my $0.02. For those of you involved in pico-ballooning who are concerned about the generation of garbage, I offer up the following sugg

Dave et al : I have a separate browser window that I keep open with both WSPRNET and APRS.fi tabs so I can quickly check to see what U3B-25 is up to on a daily basis. As Jack, W8TEE said, it has been

Folks : FWIW the Etherkit Si5351 Library by NT7S has proven to be quite reliable for HF WSPR, IMHO. As Graham mentioned, I started up this project (which are calling Aries) back in November and I have

Martin : By "minimal PA configuration" do you mean the Si5351a + BS170 or do you mean Si5351a+BS170+5W PA? If it is the former then maybe you could figure out a way to switch out the BS170, remove or

Mikael : I suspected that those resistors were acting as pullups and that explained why there were no instructions to remove them. Thanks for confirming that. Cheers Michael VE3WMB P.S. I am enjoying

#si5351a #synth