[Elecraft] Subject: Re: K3EXREF question

[Edward R Cole]

Lyle,

Thanks.  I learned something.

That does make sense as the synth are under MCU control so that would 
be the easy way to compensate TCXO drift.  REF CAL display then 
merely displays the TCXO frequency as measured against the external 
10-MHz reference.  Actual frequency is compensated by the synth.

One can measure the TEST mode output directly into a frequency 
counter (BUT DO NOT transmit full power).  I can measure the K3 10w 
signal by using a 2m rubber ducky connected to my counter and held 
next to the K3 chassis.  Running higher power is even easier to 
monitor on a counter.  Transmit in CW mode.

73, Ed - KL7UW

Date: Tue, 8 Mar 2016 05:23:46 -0700
From: Lyle Johnson <kk7p4dsp at gmail.com>
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3EXREF question
Message-ID: <56DEC452.70205 at gmail.com>
Content-Type: text/plain; charset=windows-1252; format=flowed

Almost.

The TCXO has no control input and is not tuned; it is only measured.

The measurement information is passed to the radio's MCU which then uses
the data to determine the correct value to command the synthesizer(s),
drive the REF CAL display, and so forth.

73,

Lyle KK7P



73, Ed - KL7UW
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