[Amps] השב: LDMOS HEAT SPREADERS

[Clark Turner]

I have a dual BFR188 LDMOS HF amp I built with Water cooled heat sink. 
The Water block is 15 X8 inches at half inch thick. I have a 15 x 7 
copper spreader mounted on top. The moderator refused my post about it 
with pictures. You can use a Water tank/pump and radiator meant for a 
high power computer gaming system. Some of them are up to 960 watts rated.


C


On 8/28/2016 6:03 AM, alexeban wrote:
> I don't know about that, but you have liquid cooled heatsinks for high power processors capable of taking care of a few hundreds of watts. It's flat on top so it could take a flat package and still allow relatively convenient connections.
> I remmember a design l did at a company
> Producing high ppower jammers.
> That was an MRF151 putting out 350 watts  continuous opetsting st 38 VDC.
> Alex    4Z5KS
>
> נשלח מסמארטפון ה-Samsung Galaxsy שלי.
>
> <div>-------- הודעה מקורית --------</div><div>מאת: John Lyles <jtml at losalamos.com> </div><div>תאריך:26/08/2016  10:44  (GMT+02:00) </div><div>אל: amps at contesting.com </div><div>עותק:  </div><div>נושא: [Amps] LDMOS HEAT SPREADERS </div><div>
> </div>I wonder if a high power transistor could mount on a chill block sold
> for puck type very high power devices. For instance,
>
> http://catalog.chtechnology.com/viewitems/extruded-bonded-fin-heat-sinks/liquid-chill-block?&plpver=10&forward=1
>
>
> Of course, getting the RF into and out off the device with this cooler
> in the way is tricky.
> John
> K5PRO
>
>
>
>> Date: Mon, 22 Aug 2016 07:44:16 +0100
>> From: Steve Thompson <g8gsq72 at gmail.com>
>>
>> With water cooling, why not sit the transistor over a pocket and
>> run the coolant directly against the flange? That's a method I saw
>> in production test at the Philips (as it was) factory.
>>
>> NEC had an ill fated TV broadcast tx which cooled the transistors
>> with compressed air blown directly onto the flange. In terms of
>> cooling I was told it worked just fine, the problem came when the
>> nozzles blocked with dust.
>>
>> Steve
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