[Elecraft] Alignment and Test Part II

[Brian Denley]

Don:
I used a separate frequency counter but I did struggle with finding a 
suitable probe.  Direct connection seemed to load down the circuit and 
change the frquency slightly.  I ended up using a 10X scope probe.  That 
seemed to work OK.  I have read you writeup of the N6KR procedure and I will 
give bit a try and report back.  Just in case a spent some time calibrating 
a couple of my receivers within a few Hz in case I needed to use that 
method.  It's been  a while since my Tek counter has been calibrated.
Brian
http://home.comcast.net/~b.denley/index.html


----- Original Message ----- 
From: "Don Wilhelm" <w3fpr at embarqmail.com>
To: "Brian Denley" <b.denley at comcast.net>
Cc: "Elecraft Reflector" <elecraft at mailman.qth.net>
Sent: Sunday, August 01, 2010 9:37 AM
Subject: Re: [Elecraft] Alignment and Test Part II


> Brian,
>
> That is entirely normal.  Which one of the 3 methods mentioned are you 
> using to calibrate the 4 MHz reference?
> 1) Measure the TP3 frequency with an accurate external counter - adjust 
> C22 until the K2 display matches the external counter.
> 2) Listen to the 4 MHz signal with another receiver - tune C22 until right 
> on 4 MHz.
> 3) Just set the C22 trimmer slot to the midpoint.
>
> Actually a better method (greater accuracy) exists - wait until you have 
> completed the K2 and you can receive 10 MHz ((or 15 MHz) WWV, then use the 
> N6KR method.  You can find the "How-To" on my website www.w3fpr.com 
> article on K2 Dial Calibration.
>
> 73,
> Don W3FPR
>
> Brian Denley wrote:
>> While doing the 4 MHz Oscillator calibration, CAL FCTR shows 12100.10 
>> which seem nominal.  But adjusting C22 doesn't allow me to change it very 
>> much at all, maybe a few hundred Hz.  It this normal?
>> Thanks for any help.
>>
>>