[amsat-bb] Re: ISS Crossband Repeater

n3tl@bellsouth.net n3tl at bellsouth.net
Sun Jan 11 19:39:53 PST 2009

Bill and all,

My experience in seven months of working the FM satellites and, more recently, the ISS, is to leave the transmit frequency alone. Period.

At AOS, I'm 10 kHz above the receive frequency, and tune in 5 kHz steps through the pass until I'm 10 kHz below the receive frequency at LOS. You'll hear the reception change, and will know when to tune the receive side for Doppler.

Congrats to you Andrew. From here, the ability to multitask during a pass is wonderful experience. It occurs to me (and has since I first started working the satellites) that in a real, true emergency situation, the more resourceful we are, the more effective our communications abilities can be. I continue to do everything here manually - hand-holding my antenna and manually tracking the satellites and manually Doppler tuning - for all of the satellites, not just the FM birds. I enjoy the challenge as much as it sounds like you did earlier this evening.  

73 to all,

Tim - N3TL
-------------- Original message from "Bill Booth" <ve3nxk at gmail.com>: -------------- 

> > Eventually I give up on programming it so it automatically does the split, 
> > so I program in 145.99/67hz tone on one channel, and then 437.805-437.790 
> > (in 5khz steps) in the other channels. Once I got it all programmed enough 
> > so it will work, the ISS is at the peak, and I was literally recieving it 
> > at 
> > full strength, where all of the bars in my HT are lit up. 
> I am trying to figure out the best method to get thru the repeater. From 
> the response above I am trying to decide if the uplink stays stable and the 
> downlink is tuneable, or is it best to tune both to keep on frequency. If 
> tuning for both is required which way is it normal or reverse. I have a 
> IC970 that I am using and can put it either way .... 
> At one point tonite I could hear my transmit get keyed but soon lost 
> it.......not sure if it was the pile up or my tuning... 
> Some tips would be nice ... 
> Bill Booth VE3NXK 
> Sundridge ON, Canada 
> 79.23.37 W x 45.46.18 N 
> FN05ns 
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