[Elecraft] New K144XV firmware released: reduces 2-meter spurious receive signals

[Wayne Burdick]

We do this in firmware, Jan. 

The K3EXREF module uses the external 10-MHz reference to determine the exact frequency of the 49-MHz internal reference. If a K144XV PLL is also installed, we know that the 2-meter module is phase-locked to it. We then apply an offset to the 10-meter IF mathematically so that the 2-meter frequency is dead on. This calculated offset replaces the manually entered offsets in the XVn OFS menu entry. 

73,
Wayne
N6KR

----
http://www.elecraft.com

On Mar 22, 2011, at 6:08 AM, Jan Holmer SM6TUW <sm6tuw at gmail.com> wrote:

> Wayne, 
> 
> The 116/118 MHz PLL can obviously not be locked to the 49 MHz ref as you
> mentioned in an early posting 
> describing the functions of the coming K144XV add-on board. 
> The present FLL solution of the KREF3 corrects the 49 MHz internally. 
> Which external ref will be used for the K144XV PLL, the ext ref (10 MHz)? 
> 
> Jan 
> SM6TUW
> 
> 
> wayne burdick wrote:
>> 
>> Jan Holmer SM6TUW wrote:
>> 
>> &gt; Wayne, David, my question was unclear: I was referring to the  
>> &gt; optional PCB to
>> &gt; be installed inside the K144XV on top of the tranverter PCB.
>> &gt; The K144XV I already have. I am looking forward to the PLL function  
>> &gt; for
>> &gt; locking the 116 MHz VCXO to the 49.380MHz.  Is that project ongoing?
>> 
>> In progress.
>> 
>> Wayne
>> N6KR
>> 
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