Ted,
If the people at Elecraft have done their job and mounted the transistor
properly with the correct torque on the mounting hardware procedure, no
additional maintainance is required. I have been in the industry for a LONG
time . Three things to remember in the mounting of any RF or high power
device. Flat surfaces, minimual mating gu, and required torque. Lack of any of
these will kill a device if not correct. I have never required retorqueing
parts, with one exception. In 000 copper wire terminals, the copper does
relax and needs to be retorqued to achieve a gas tight seal connection, but
that is in industrial application. Small RF devices only need the initial
torque to be correct.
Mel, K6KBE
From: Cameron Francey <[email protected]>
To: "Dauer, Edward" <[email protected]>; "[email protected]"
<[email protected]>
Sent: Saturday, October 28, 2017 12:10 PM
Subject: Re: [Elecraft] PA Transistors Maintenance in K2
A nice tip which I use when looking for anything in any sort of .pdf manual,
Elecraft included as I have accumulated quite a number of them over time is to
use the search feature on the .pdf reader. Ctrl+f on WIndows and cmd+f on Mac
and type what I'm looking for. The index and contents tables are good, but
obviously can't have everything in them, so I use the find feature a lot.
Hope this helps.
Regards, Cameron - AF7DK/GM7LQR
________________________________
From: [email protected] <[email protected]> on
behalf of Dauer, Edward <[email protected]>
Sent: Friday, October 27, 2017 8:15 PM
To: [email protected]
Subject: [Elecraft] PA Transistors Maintenance in K2
I vaguely remember reading somewhere that after some number of hours of
operation – maybe 50 – the hardware holding Q7 and Q8 onto the heat sink should
be tightened, I presume to maintain good heat conduction from the tabs to the
sink. But I can’t find that instruction in the manual now. Anyone know where
I might have gotten that notion, or did I just make it up?
Thanks,
Ted, KN1CBR
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