Hello Matt 

There were a lot of converted MMDS converted downconverters from the the AO-40 
(sobsob) days.  I have a couple I dearly cling to, with hopes of a future HEO.  
There are some commercial ones from Keps, SSB http://www.ssbusa.com/modes.html 
.  and few others. These can be a bit pricey.  Try to find a AIDC 3731 
downconverter by Transystems.  These were converted and sold by K5GNA again 
back in the AO-40 (sobsob) days.  They were an excellent dc and reasonably 
priced.  Once a dc is procured a tv type 18 inch dish with a 5 turn helix feed 
in front of it makes a super antenna.  A simple 8-16 turn helix is another 
option as well as yagi antennas used for wifi are effective.  There a many ways 
to work this problem.  If we had a HEO in the works this bb would be flooded 
with information, with lots of deals.  Good luck with your efforts.  Mode S on 
AO-51 is fun to experiment with. 

73 Bob W7LRD 

Seattle 
----- Original Message ----- 
From: "Matt Patterson" <[email protected]> 
To: [email protected] 
Sent: Thursday, September 9, 2010 8:19:22 AM 
Subject: [amsat-bb]  AO-51 mode V/S 

I'm wanting to try this mode but haven't had much luck finding a 
downconverter.  What does everyone use?  Any leads as to where a 
downconverter can be purchased would be much appreciated. 

73 Matt 
W5LL 

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