[prev in list] [next in list] [prev in thread] [next in thread] 

List:       elecraft
Subject:    RE: [Elecraft] KAT2 alignment question
From:       "Don Wilhelm" <w3fpr () earthlink ! net>
Date:       2006-11-30 22:08:07
Message-ID: NGEDLJLDCGJIHEGPMIJPIEKGFMAA.w3fpr () earthlink ! net
[Download RAW message or body]

Richard,

Those numbers are in the ballpark - the exact voltage at U4 pin 1 will
depend on the power output as well as the position of trimmer R1 - if your
R1 is not quite to the center position, that would explain having less than
3 volts.  The bridge null is sharp, and if you have a DMM that responds
faster than the K2 display or an analog DC voltmeter you may be able to
achieve a better null by monitoring the voltage at the junction of R2 and
the cathode of D2.  Be certain to use an insulated tool when adjusting C55
because both sides of it are above ground. Tune C55 very slowly once near
the null point.

73,
Don W3FPR

> -----Original Message-----
>
> I have a question about the KAT2. I just finished building one and am
> testing it. The voltage at U4 pin 1 is 2.74 at 5 watts 1.04 at 1 watt and
> 3.95 at 10 watts. The null dips to a count of 5. Are these numbers good
> enough? Or do I need to rewind T1?? I have not installed R6 yet,
> I was going
> to wait untill I am satisfied this is ok first.
>
>
--
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.430 / Virus Database: 268.15.2/559 - Release Date: 11/30/2006
5:07 AM

_______________________________________________
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft    

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
[prev in list] [next in list] [prev in thread] [next in thread]