[Elecraft] Frequency calibration - again

[Baker]

On Sun, 24 Aug 2003 08:38:03 -0500, Rich Lentz wrote:
>
>
>
>>The first thing I noticed is that it said my sidetone, set to=
 700Hz
>>
>>in my case, was at 710.3Hz, and a check with my counter=
 confirmed
>>this. What implications does this have in using the sidetone=
 beat
>>as
>>a guide for exact tuning, and is this a common problem?
>
>I have noted this on the reflector SEVERAL times, yet I=
 continually
>read
>posts to the effect that " after zero beating the signal he=
 came
>back off
>frequency," or " After zero beating WWV it was still off by +/-
>XX.X," etc.
>Bottom line is your calibration will be off by at least as much=
 as
>the side
>tone inaccuracy if it is used for calibration.
>
>The other phenomenon I have noted is that the "clock" must be
>slightly
>faster than 4.000000 MHZ to get the most accurate readings on=
 ALL
>bands.
>Mine is about 4,000.005 KHz to get readings for WWV at 10 and=
 20
>within 10
>Hz.  When set for 4,000.000 KHz WWV is off by more than 40 Hz at=
 20
>and 20
>Hz at 10. I think this is needed to allow for computer=
 overhead.
>
>Rich

>>I hope that this is not true or I will have wasted a lot of 
time/effort trying to get the 4MHz oscillator spot on !

73

Stewart G3RXQ
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-- baker@nildram.co.uk on 24/08/2003