Hi Dave Another matter to consider: When the U3S starts transmitting, its finals warm up and the heat dissipation of other components in the circuit changes, too. The TCXO will adjust itself to hold i

Hi Dave Search this forum for "tcxo"; you'll find plenty of discussion about this. When I installed a Taitien TCXO, my U3S's drift performance improved so much that it even worked well on 2m. TXETBLSA

Hi Steve, I also used 4 18650 cells for my QCX. They're mounted to a piece of acrylic under the QCX, making a compact assembly. I also included a tiny voltmeter along with a toggle switch so that it i

I made and used one like Braden's for a while until I borrowed my friend's pneumatic launcher. I'm too weak to shoot an antenna higher than 15 meters with my slingshot. Building my pneumatic launcher

It's heading home! Will it cross the 79.4 W longitude line any closer to its launch site than U3B-14 did? I noticed that this one lingered around Hawai'i during laps 4 and 5...is it trying to suggest

#wspr

Hi Mikael, It went right over me early in the morning and I didn't hear it as it drifted further eastward. It's going really fast! Did I neglect to adjust my VFO to compensate for doppler shift? Now I

Hello Mikael, Your BSS20 is headed my way! I'm very pleased that my radio picked it up today. Can you tell us anything about the payload and balloon? Does it have a QRP-Labs product on board? When was

Way to go, Dave! Your many studies, experiments, engineering, and skill have generated quite an achievement! I missed it this time around because I was fussing around with the next version of my beam.

Hi Dave, I was concerned that using a DC-DC converter in my QCX power circuit might generate an EMI headache, so I built a setup to run my QCX on battery power. I use 4 18650 Li-ion cells. This is a r

Hi Dave, I fully agree with you that the meteorological radiosonde balloons and payloads are a vastly larger contribution to the planet's pollution load than the balloons we're discussing here. In add

Hi Joe, I also don't wish to impose my personal balance point (I like the way you articulate this) regarding littering on others in this forum. I appreciate having this discussion about where we perso

Hi Dave, Thanks for the mass data on the tripole vs trap dipole options. If the 7.5m element had a trap in it, it would get a little shorter for resonance because of the inductance of the LC trap that

John, This is a hobby. We're here to support each other in our shared interests. We're here to have fun. Your sarcasm and twisted, false characterizations of some of my prior posts do not serve that m

Thanks, Dave, for the comments on the possibilities around what could be causing this. On one occasion when I picked up the second line I was in my radio room and examined the waterfall display in the

Hi Joe and others I am pleased to read that other hams are concerned, as I am, about the garbage problem to which disposable radio balloons contribute. Thank you, Joe, for raising the issue. Yes, it's

Hi Dave, My homebrew 20m Bird Yagi Uda points where-ever I think a balloon with a 20m transmitter is, and it's very exciting when I see a spot. I was very pleased when it picked up your balloon on its

Has anyone tried the QRPLabs dummy load http://qrp-labs.com/dummy.html on VHF? Does it work well? I don't expect it to work well on UHF; it just looks like it has a bit too much inductance. And it's p

#vhf

Hi Mikael, I pointed my Bird-Yagi-Uda west this morning to have the best chance of receiving this balloon. I'm happy to see that I'm picking it up! I tuned my VFO up 150 Hz so that SA6BSS would be at

Hi Bob, (re. using a Weak Signal app with an Analog-tuned receiver. The thread topic has changed, but I'm afraid this will be lost if I change the subject line) Yes, you can! But it ain't easy. I used

I'm eager to watch these flights as I have done for so many others. Hans' Flights website has been a great way to follow the fun. I presume these two are not listed there because the telemetry recepti