[Elecraft] K3S & 2m Internal Transverter Calibration ProblemUsing External Reference

[w4sc]

Are you seeing the 800Hz error in both band segments (144 and 146)?

Looking at the schematics, there is an adjustment for each LO, but this must be a factory adjustment as there is no mention of them in manuals.  

Good to contact support.  All would be interested in the resolution.

73 de Ben W4SC

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From: John Stengrevics
Sent: Tuesday, August 11, 2020 21:54
To: w4sc
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3S & 2m Internal Transverter Calibration ProblemUsing External Reference

Ben,

The K144XV & Phase lock calibration steps have already been performed.  The problem arises when using an external reference oscillator.  

Elecraft support emailed.

Thanks,

John
WA1EAZ


On Aug 11, 2020, at 7:14 PM, w4sc <w4sc at windstream.net> wrote:

Read the following: 
 
1. K144XV manual pp20
2. K144XV Reference Oscillator Phase Lock Option Manual. Pp 11
 
Once the K3S 49MHz oscillator is calibrated, leave alone.
 
The LOs (plural,,,116MHz and 118MHz) are locked to the 10MHz reference (which, depending where you are in the 2M band).  If there is no 10MHz reference applied, keeping the desired accuracy may be impossible over a range of temperature.
 
You should be able to attain +- 10Hx accuracy according to the K144XV manuals.  If the 800Hz error cannot be corrected by the procedure outlined, I suggest contact Elecraft support.
 
Ben W4SC
 
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