[Elecraft] Remove the Heat Sink or Go to the Dentist?

[Don Brown]

Hi

I have R&R the heat sink on several K2's several times adding options for=
 people. I remove the back hardware and the screws and nuts from the bott=
om. With the radio on its side carefully push the PA mounting screws just=
 a little past flush with the bottom cover. Then remove the cover. As soo=
n as the cover is clear push the screws back in from the top so the hardw=
are does not fall off. Check the insulators for damage and make sure they=
 are still on the transistors and not the heat sink. Thread the nuts on t=
he mounting screws loosely without lock washers and do what ever you need=
 to do under the cover. The insulators and hardware is held in place by t=
he nuts so there is no worry about loosing anything. =20

To reinstall the heat sink remove the nuts and with the radio on it's sid=
e push the screws flush with the transistors and slip the heat sink over =
the BNC connector and key jack. When the holes line up push the screws in=
 from the top and install the lock washers and nuts. Then install the res=
t of the hardware. Check the collectors to ground for shorts with a DVM b=
efore powering up again.

BYW while you are under the cover if you have installed the aux RF and au=
x DC in connectors it is a good idea to install the DC blocking capacitor=
 modification on the aux RF connector. This will prevent damage to the ou=
tput stage if the battery or aux power connector is plugged in to the RF =
connector by mistake. The mod is - cut the run close to the aux RF connec=
tor and install a .047 (473) capacitor in series with the hot side of the=
 connector. This mod is described in the KPA100 manual and is a good idea=
 to install on all K2's

Don Brown
KD5NDB

----- Original Message -----
From: Tom
Sent: Sunday, June 16, 2002 1:35 PM
To: Elecraft@mailman.qth.net
Subject: [Elecraft] Remove the Heat Sink or Go to the Dentist?

Hi gang,
  OK, given the choice, I suppose I'd rather take off the K-2's heat sink
than have oral surgery, but sometimes I feel like it's a tough decision.

I guess to be more precise, its re-installing the heat sink that I dislik=
e
so much.  Does anyone have a solution to getting the thing back on withou=
t
shorting either of the 2 power transistors to the casing?

Any ideas would be appreciated, because I really enjoying looking at the
inside of my K-2 :)

Thanks
Tom
WB2QDG
K2 s/n 1103


Friend of Bill W.
   ---  If you are too, drop me a line.

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