The ISS is between 250-300 miles away in this picture, traveling so fast that a drop of sweat has the kinetic energy of a 44 magnum. And yet the short antenna and circuitry on that little $50 radio can see what amounts to a microwave lightbulb hanging off the ISS well enough to extract a one part in a million fluctuations in power four hundred and thirty seven million times a second.
Even if they didn’t show the invite would be a keepsake.
AFAICT it's around this point that you can't tell whether there is a transmission, unless you know what it looks like; tuning requires decoding and/or fancy math, not a spectrometer; communication works just fine (with proper transmission modes), but there are nontrivial practical consequences as you approach or go below the noise floor.
I wouldn't expect to see analog equipment operating below the noise floor.
And yes, it baffles me as well.
I couldn't believe my eyes when I actually saw a signal pop up as it passed: https://imgur.com/a/jCOaFSk. It's apparently closer tonight, so I'm going up on my roof to see if I can get audio!
I grabbed the radio and ran outside to try and get a contact on the repeater myself, but no luck. :-(
Still, just hearing it was kinda cool in its own right.
Edit: as luck would have it, the ISS just passed over about 5 minutes ago. I went outside ahead of time to wait for it, and I caught a bit of audio, but wasn't able to make any contact myself. I think I waited a little to long to try, out of fear of walking on somebody else (per the earlier discussion, I don't have a radio with cross-band full duplex capability). Oh well... live and learn. And I'll buy a better radio at some point.
There are also occasional opportunities to speak directly with people on the ISS (or more commonly, receive telemetry or slow-scan TV images).
he replied with this link https://ve3cnu.blogspot.com/2012/03/this-ham-shack-is-crazy....
Unfortunately looking at his logs I fear he may be a silent key. No contacts in a year.
> By now you've probably guessed that George isn't exactly a spring chicken, and that he's getting up in years. This is very true and it is one of his great wishes that his collection find a permanent home after he's gone so that future generations can enjoy and appreciate the hobby for many years to come.
I wonder if anyone was able to make that happen.
And nice marketing for Kenwood!
I’d probably get a D710G if I had a more suitable vehicle for it, like a space station (or truck I guess).
I have the D72A which is the handheld equivalent (fewer features of course, but has APRS/packet radio TNC built in) and it’s great.