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

[Mike Seguin]

Quick correction, the devices are 'combined' not push/pull. They use a 
Wilkinson.

That's what I get for posting before i had my morning coffee....

---
73,
Mike, N1JEZ
"A closed mouth gathers no feet"

On 2016-04-11 06:00, Mike Seguin wrote:
> Everyone,
> 
> 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.
> 
> Mike
> 
> 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
>> 
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