[amsat-bb] Link budgets for upcoming HEO/GEO sats

Jim Barbre jbarbre at xmission.com
Sun Apr 10 23:30:46 UTC 2016

Hello all,

     Has anyone considered this? It is a bit more expensive, but it 
looks like it will deliver 4W (36dBm) with 100mW (20dBm) input.

Jim Barbre

On 4/10/2016 2:43 PM, Edward R Cole wrote:
> John, etal:
> Hope someone tests this and gives a report.  Cost is quite reasonable 
> for this kind of power at 5-GHz.  Note that the DEMI 5670-144 
> transverter output is +16 dBm (200mw) so one could obtain 2w with 
> drive from one.  ERA-5 was common mmic used for this level.  Getting 
> 600mw is a bit harder.
> Most of these run class-A so do dissipate a lot of heat; most of the 
> power becomes heat and not RF. 10-dB RF gain is respectable at microwave.
> Comment on az-el suitable for 1m dishes at 5 and 10-GHz.  The Yaesu 
> satellite rotators do not resolve pointing angle less than 7-1/2 
> degree so probably not adequate.  There are some inexpensive telescope 
> drives that might work at reasonable prices.
> 73, Ed - KL7UW
> Date: Sun, 10 Apr 2016 13:24:40 -0500
> From: John Toscano <tosca005 at umn.edu>
> To: n1jez at burlingtontelecom.net
> Cc: AMSAT BB <amsat-bb at amsat.org>
> Subject: Re: [amsat-bb] Link budgets for upcoming HEO/GEO sats
> Looking forward to testing mine too. I found another web site that claims
> that 600mW of input drive would give nearly 5W of output.
> http://www.aliexpress.com/item/Free-Shipping-Power-Microwave-TXPA58002W5-5-8GHz-5-8G-AV-Wireless-Transmitter-Tx-Signal-Booster/32231215867.html?spm=2114.40010208.4.133.5VRg7W 
> He has a few pictures showing him taking power measurements himself, 
> making
> this a bit more believable. Would have to watch the heat dissipation
> closely, since they quote 20 watts of supply power (so 15 or more 
> watts of
> heat).
> John
> 73, Ed - KL7UW
> http://www.kl7uw.com
>     "Kits made by KL7UW"
> Dubus Mag business:
>     dubususa at gmail.com
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