Amps
[Top] [All Lists]

[Amps] Newbie RF amp construction question

To: <amps@contesting.com>
Subject: [Amps] Newbie RF amp construction question
From: stevek at jmr.com (Steve Katz)
Date: Wed Apr 16 10:55:04 2003


> I'm taking on my first home-built amp. It's the Granberg Motorola EB104 
> design (600W from four MRF150s; basic circuit looks like the Ameritron 
> ALS-600). I've assembled kits before but don't have a clue about building
> a 
> heat sink from scratch. How do I go about attaching the RF transistors to 
> the PCB, copper spreader and aluminum heat sink?
> 
> //Normally, the transistors attach directly to the heatsink, using their
> mounting screws, with thermal grease between the transisor and the sink.
> If you have a copper spreader, of course that gets securely sandwiched
> between the transistor bases and the aluminum heatsink, using thermal
> grease at all interfaces, and still gets all screwed together.  The PCB
> should have holes in it where each transistor mounts.  Only the transistor
> C-B-E tabs actually attach at all to the PCB -- the base of the transistor
> doesn't even touch the board.  Sounds like you don't have the board on
> hand to look at.....-WB2WIK/6
> 
> 
> Thanks. Don November-Alfa-Six-Zulu
> 
> --
> Don Putnick
> dputnick@alumni.caltech.edu 
> 
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
<Prev in Thread] Current Thread [Next in Thread>