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

Mike Seguin n1jez at burlingtontelecom.net
Mon Apr 11 10:00:05 UTC 2016


This has been tested already. A fellow ham has done it and shared 
findings with me. The 600 mW drive is with a pad still inline on the 
input. If you bypass it, drive drops to 10-12 dBm range.

The devices used are from Skyworks. SE5004L. There are two in push/pull.

We have been discussing this amp on the phase4ground list for use as a 
test bed.

Ed, this would make a very nice amp for portable 5760 use.


On 4/10/2016 5:43 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
> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership.
> Opinions expressed
> are solely those of the author, and do not reflect the official views of
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb


Mike, N1JEZ
"A closed mouth gathers no feet"

More information about the AMSAT-BB mailing list