[amsat-bb] RE: Uplink requirements for AO-40

[Rod Smallwood <rod@xxxxxxxxxx>]

Hi!

	430Mhz 50Watts PEP (Adjust for correct level in relation to the
beacon)
	  -> Low loss coax -> 10+ Turn 430Mhz Helix 
	
	That ought to do it!

	Rod G8DGR


		



-----Original Message-----
From: Jonathan NAYLOR [mailto:Jonathan.Naylor@socgen.com]
Sent: 26 November 2001 13:31
To: amsat-bb
Subject: [amsat-bb] Uplink requirements for AO-40


Hi

I have seen lots of traffic on the AMSAT-BB archives about the receive side
of
operating AO-40, but relatively little about the uplink requirements.

Can people let me know what the required EIRPc is to have a moderate signal
via
AO-40. I am particularly interested in the 1269 MHz uplink, but I think my
first steps
will be with the 435 MHz uplink.

I am a veteran of AO-13 mode L and S, but I sold my equipment many years ago
:-(

I plan to use a 60cms prime focus dish for the downlink with a small helical
feed and
a G3WDG converter. The dish is currently in use on 6cms and 3cms but those
bands
are now hibernating for the winter.

In the past I used small helicals as feeds on mode L and mode S on AO-13
with a 1.4m
dish and had good success, the two feeds were mounted co-axially but in
those days
we didn't need to worry about cross coupling since only one was in use at a
time.

Thanks

Jonathan  HB9DRD/G4KLX
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