[Scan-DC] 137-138 MHz satellites?

[David I. Emery]

On Thu, Jun 11, 2009 at 08:40:33PM -0400, Andrew Clegg wrote:
> I've been recording some waterfall plots of the 137 - 138 MHz satellite 
> downlink band with my HP spectrum analyzer today. I looked back through the 
> data recorded while I was at work, and it appears I caught several 
> narrowband signals throughout the band, and one relatively strong broadband 
> signal near the top of the band. This is just with a discone, and without 
> any pre-amp, so the signals must be fairly strong (for satellites) to show 
> up directly on the specan, given the lousy noise figure. The signals come 
> and go consistent with the ~few minute pass of a LEO satellite, so I believe 
> they are real, although I can't yet be certain. They should be easily heard 
> on my receiver, or even a regular scanner with a decent antenna.

	You should also see doppler on any satellite based signals.
On a waterfall this will result in a tilt rather than straight line
plot.


-- 
  Dave Emery N1PRE/AE, die at dieconsulting.com  DIE Consulting, Weston, Mass 02493
"An empty zombie mind with a forlorn barely readable weatherbeaten
'For Rent' sign still vainly flapping outside on the weed encrusted pole - in 
celebration of what could have been, but wasn't and is not to be now either."