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Re: Ham shack satellite communications

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>Gerhard Hoffmann <dk4xp@arcor.de>wrote:
>>Am 16.09.26 um 16:25 schrieb Jan Panteltje:
>
>> 
>> I have this for 2.4 GHz:
>>   https://panteltje.nl/pub/spectrian_2.4-GHz_linear_top_view_IMG_4576.JPG
>
>Do you have any info on that Spectrian stuff?
>
>Methinks I have the same but can't find the info anymore.
>
>https://www.flickr.com/photos/137684711@N07/53498717513/in/datetaken/lightbox/

I bought it on ebay, March 2019 says the time of this file.
Time flies :-)

Below is what I have saved from the seller,
the ebay link below no longer works, seller is still on ebay (google KI4NPV)?


From:
 https://www.ebay.com/itm/75W-Spectrian-Linear-RF-Amplifier-Board-2-3-2-35-GHz-18dBg-24-26V-/223448095832?oid=221556214361

ebay.com/itm/221556214361

Picture Information
75W-Spectrian-Linear-RF-Amplifier-Board-2-3-2-35-GHz-18dBg-24-26V

Details about  75W Spectrian Linear RF Amplifier Board 2.3-2.35 GHz 18dBg 24/26V

This is a 75W linear amplifier board as removed from a new Spectrian power amplifier which is optimized for 2.30-2.35GHz but is also useful up to 2.45GHz at reduced power an gain.
This amplifier board does not require any tuning for use on the ham band! Required supply voltage is 24-26Vdc at about 17A.
Input drive required for 75W output power is 1.25W.
Power gain is 18dB.
Saturated power is 80W+.
This is the final Rev.
for this board design (Rev A)which has larger plated through holes and the holes have been sealed so the silicon grease does not come through the top side when bolting the board down to the heat-sink.
The earlier rev.
were all number revs with open vias.
I sell the older "number rev boards" at a lower price on other auctions.
The sweep photo shows one of these amps putting out 80W with about one watt input at 2304GHz.
The output (CH1) reference is set for 100W (50dBm)with a scale factor of 5dBm/division.
Channel 2 is the input power with it's reference set for 10W (40dBm)with 5dBm/division.
Sweep is from 2.2-2.6GHz with 50MHz/ division.
Looking at the output plot you will see the level 1dB down from 50dBm or 80 Watts and the input 9.4dBm down 40 = 30.6dBm, slightly over one watt.
Looking at 2450 MHz you can see the output is down 4dB form 50 - 46dBm = 40W.
Note the preamp I am driving this PA with is not linear with frequency over this full range as indicated by channel 2.
Circuit board is on an integral .062" solid copper heat spreader.
Both the board upper surface and the heat spreader surface are heavy gold plated.
Board needs to be mounted on heat-sink using Silicon grease and 7ea.
4-40 screws in existing holes.
RF input and outputs are 50 ohm strip-line and will butt up to a standard SMA or N launch connector.
Good quality SMA connectors are rated to 400W at 2GHz and work very well for this amp.
The XRF286 Lateral Mosfets used on this board can handle a 10:1 VSWR at full power so isolators are not required.
Board dimensions are 2.25" x 5.9".   57.15 x 149.86 mm
Weight is 6 ounces.
DC connector pin-out.
1, Temperature output = 10MV/ degree F.
2, PTT = +12V To enable all 3 power FETs.
3, Drain current monitor for Q1.
1 volt out/amp of drain current.
4, Drain current monitor for Q2.
1 volt out/amp of drain current.
5, Ground.
6-10 are no connection.
(I also have some of the complete 180W Spectrian amplifiers available and will
start a fixed price auction for you by request.
Please call [phone removed by eBay] to request an auction if you don't see one
currently running.)

Florida buyers must add 7% (or actual amount for your county) sales tax or mail me a signed photocopy of your Florida Resale Certificate with your payment! I do combine auction winnings when ever possible to save buyers money.
I do ask that buyers help keep track of any auction shipments they want to combine and email me for a total when they are ready.
Fixed Priority S&H quoted prices are for 50 USA states.
International Bidders pay actual S&H.
Good luck bidding! KI4NPV [phone removed by eBay]

Power consumption 17 x 25 = 425 W
heat 425 - 75 =  (17 * 25) - 75  = 350 W
Junction temp is 100? C ?
Rth = 100 / 350 = .285714 C/w

That leads to this for heatsink:
https://www.conrad.nl/p/profielkoellichaam-03-kw-l-x-b-x-h-150-x-75-x-62-mm-fischer-elektronik-la-6-150-al-166111
 Profielkoellichaam 0.3 K/W (l x b x h) 150 x 75 x 62 mm Fischer Elektronik LA 6 150 AL
 Koellichaam met hoog vermogen
  Artikelnummer: 166111
  Fabrikantnummer: 10015838
  EAN: 4016138077872

Met een bijzonder effectieve warmteafvoer door de geoptimaliseerde holle ribben.
Translated from Dutch:
 Very effective heat transfer because of hollow ribs.
    Garantee: minimaal 2 jaar
    Make: Fischer Elektronik
--------------------------

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Thread

Ham shack satellite communications "Don" <g@crcomp.net> - 2026-09-14 15:14 +0000
  Re: Ham shack satellite communications Cóilín Nioclásín Glostéir <thanks-to@Taf.com> - 2026-09-15 20:13 +0000
    Re: Ham shack satellite communications "Don" <g@crcomp.net> - 2026-09-15 21:40 +0000
      Re: Ham shack satellite communications Jan Panteltje <alien@comet.invalid> - 2026-09-16 07:45 +0000
        Re: Ham shack satellite communications "Don" <g@crcomp.net> - 2026-09-16 11:56 +0000
  Re: Ham shack satellite communications Don Y <blockedofcourse@foo.invalid> - 2026-09-16 05:54 -0700
  Re: Ham shack satellite communications Gerhard Hoffmann <dk4xp@arcor.de> - 2026-09-16 15:37 +0200
    Re: Ham shack satellite communications Gerhard Hoffmann <dk4xp@arcor.de> - 2026-09-16 15:42 +0200
    Re: Ham shack satellite communications Jan Panteltje <alien@comet.invalid> - 2026-09-16 14:25 +0000
      Re: Ham shack satellite communications Gerhard Hoffmann <dk4xp@arcor.de> - 2026-09-16 16:56 +0200
        Re: Ham shack satellite communications Jan Panteltje <alien@comet.invalid> - 2026-09-16 17:59 +0000
          Re: Ham shack satellite communications Gerhard Hoffmann <dk4xp@arcor.de> - 2026-09-16 20:17 +0200
      Re: Ham shack satellite communications john larkin <jl@htigct.com> - 2026-09-16 11:31 -0700
        Re: Ham shack satellite communications Gerhard Hoffmann <dk4xp@arcor.de> - 2026-09-16 21:28 +0200
          Re: Ham shack satellite communications "Don" <g@crcomp.net> - 2026-09-16 19:57 +0000
          Re: Ham shack satellite communications john larkin <jl@htigct.com> - 2026-09-16 13:18 -0700
            Re: Ham shack satellite communications Gerhard Hoffmann <dk4xp@arcor.de> - 2026-09-17 00:22 +0200
          Re: Ham shack satellite communications Jan Panteltje <alien@comet.invalid> - 2026-09-17 06:12 +0000
    Re: Ham shack satellite communications "Don" <g@crcomp.net> - 2026-09-16 14:54 +0000

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