[Top] [All Lists]


Subject: Re: [Amps] השב: LDMOS HEAT SPREADERS
From: Clark Turner <>
Date: Wed, 31 Aug 2016 09:19:57 -0700
List-post: <">>
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.


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 
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 <> </div><div>תאריך:26/08/2016  10:44  (GMT+02:00) </div><div>אל: </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,

Of course, getting the RF into and out off the device with this cooler
in the way is tricky.

Date: Mon, 22 Aug 2016 07:44:16 +0100
From: Steve Thompson <>

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.

Amps mailing list
Amps mailing list

Amps mailing list
<Prev in Thread] Current Thread [Next in Thread>