[Elecraft] K3 freq. stability question?

[Edward R. Cole]

Wayne,

Thank you for resolving an old issue that arose when I first 
explained my dual-polarity diversity receiver for eme.  Critical for 
this is that the two K3 receivers are freq. locked (have zero 
offset).  I am modifying my two LP-Pan to run off a single xtal 
oscillator so they will be phase-locked, as well.  The LP-Pan xosc 
runs at 32.836 MHz (4x the K3 IF) as sampling clock for the LP-Pan 
SDR.  I will run 96-KHz bw for diversity reception on 144-MHz.
Full details: http://www.kl7uw.com/LINRAD.htm

I have been informed that my new dual-receive 2m transverter was 
shipped, yesterday from DEMI.  That was the last remaining piece of 
the system.  I will still have a lot of testing and sw settings to 
work out for the system to be QRV, but getting closer.

Eventually, the DEMI transverter will have a PLL using an ext. 
reference like the K3.

73, Ed - KL7UW

------------------------------

Message: 33
Date: Tue, 22 Mar 2011 19:37:54 -0700
From: Wayne Burdick <n6kr at elecraft.com>
Subject: Re: [Elecraft] K3 freq. stability question?
To: ac5p at sbcglobal.net
Cc: elecraft at mailman.qth.net
Message-ID: <8DB5E0F7-6FAA-47D9-ADCD-D000B2BC7903 at elecraft.com>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes

All signal sources are phase locked to this reference, Mike.

The other factor is synth DDS resolution, which is about 1/5th Hz, and
can lead to about a +/- 1 Hz error, worst case, during operation.
However, in diversity mode, both synths are set to the same DDS
digital word, so there's zero offset. (This is not true of some other
radios claiming to do diversity.)

73,
Wayne
N6KR



73, Ed - KL7UW, WD2XSH/45
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