Re: [amsat-bb] Minimalist equipment

[Achim Vollhardt <avollhar@xxxxxxxxxxxxxxx>]

Hi Sat-Folks,
this is it!! 100W EIRP on U.. when I watch the AGC-Readings, which
sometime say something over 20 dB(!!) I can't help to feel sorry for the
guys pumping 100W into 10el yagi or even more.. so much wasted energy.

Keep your signal 10dB below the MB and everyone can sell his PA..
Sad, that it seems we have to wait for LEILA.. we should be able to do
this by ourselves.

73s Achim, DH2VA



G0MRF@aol.com wrote:
> 
> Hi  Ed / All.
> 
> After reading about the 18dB of AGC I decided to get up at 02.00 local and
> see how sensitive the transponder is when there's only a few users. (mid
> atlantic to Japan in the footprint)
> 
> TX:  9 element Yagi (Tonna) on 435 with a Bird 43 Wattmeter at the antenna.
> RX:  26 turn helix and Drake 2.5dB noise figure + FT290
> 
> With the antennas in the shack pointing out of the correct window and aligned
> with the satellite I reduced power.  With only two other stations on AO-40 at
> the time the minimum power for 100% copy was 6 Watts RF out.
> The Yagi was quoted as 13dBi by Tonna so I guess that's about 73 W  ERP
> referenced to a dipole.  Pretty good...
> 
> AO-40 was 39,000km range with an excellent squint angle at the time.
> This is exceptional. Under normal conditions I really need a small dish for
> anything beyond 40,000km.
> 
> As a bonus I managed to work JA6BX and 4X1AS later in the orbit. Great fun!
> 
> 73
> 
> David  G0MRF
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-- 

----------------------------------------------
    Achim Vollhardt
    Universitaet Zuerich
    Physik Institut, 36J36
    Winterthurerstrasse 190
    CH-8057 Zuerich
 
    tel: 0041-1-6355742
	 0041-1-6355704 (fax)
 
    email: avollhar@physik.unizh.ch
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