[amsat-bb] Re: ISS X Band - 17:05z EL96

n3tl@bellsouth.net n3tl at bellsouth.net
Fri Feb 20 10:44:42 PST 2009

David and all,

I'm confident someone will correct me if any of what follows is in error.

I believe two elements are at play during passes when the ISS repeater is active.

1 - Doppler-tuning on the transmit side is important. 

2 - I suspect the squelch is set somewhat on the radio up there; otherwise, I doubt anyone would get through at all.

My sense is that the "jamming" you alluded to has more to do with people who are transmitting with decent power levels who are hitting the repeater but are slightly off the uplink frequency. That, plus some whose signals barely break the squelch. 

And there I was ... out in the front yard with my VX-7R set at 50 mW out. Like THAT signal has a chance!

I'm gonna keep trying, though, whenever I use the HT for a pass.

73 to all,

Tim - N3TL
-------------- Original message from David - KG4ZLB/MØZLB <m0zlb at btinternet.com>: -------------- 

> Either someone doesn't know how to use their equipment or their 
> equipment is broken or it really was the most blatant attempt to 
> block/jam the signal from the ISS during the most recent pass (17.05utc). 
> My money is on the latter although I would hope for one of the former 
> excuses - either way it was a complete mess! 
> Many thanks to N5AFV, W5KUB and AA9LC who managed to get a workable 
> signal through! 
> David 
> www.kg4zlb.com 
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