Tom, VK2OE wrote:
I wonder if someone was trying to use a very high stability external
oscillator with the K3, for example a HP Z3801A. Or maybe another GPS
disciplined high accuracy oscillator.Another interesting field for
experimenting..... Tom, VK2OE
If you download the K3 Schematics file from the Elecraft website, the
page for the KREF3 shows an 8-pin header (J4) ready for an "Ext Sync
Module". This has connections for:
* 49.380MHz output from the existing XO module
* XO frequency control voltage
* External Reference input from the rear panel
* 5V
* 100Hz [1].
Draw your own conclusions. It seems that the Ext Sync module will
contain a PLL chip to lock the existing XO to an external reference
(most likely 10MHz).
The True Faithful will then be able to connect a GPS disciplined
external reference, leaving no further doubt that the K3 was designed
with a direct link to Heaven.
[1] The 100MHz bus wanders around various parts of the K3, terminating
at the main controller. Has anyone worked out what it's used for?
--
73 from Ian GM3SEK
http://www.ifwtech.co.uk/g3sek
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