[Elecraft] New K144XV firmware released: reduces 2-meterspurious receive signals
Jeff Cochrane - VK4BOF
vk4bof.elecraft at gmail.com
Tue Mar 22 18:18:33 EDT 2011
Hi Wayne and all,
I have just installed the latest production firmware (4.30) and my 2M S meter readings have reverted back to the old (pre beta 4.29) behaviour. (ie: the S meter reads S 4 for a S 9 repeater signal.)
Can anyone else confirm this?
TIA
Jeff Cochrane - VK4BOF
Elecraft K3 # 4257
----- Original Message -----
From: Wayne Burdick
To: Jan Holmer SM6TUW
Cc: elecraft at mailman.qth.net
Sent: Wednesday, March 23, 2011 12:11 AM
Subject: Re: [Elecraft] New K144XV firmware released: reduces 2-meterspurious receive signals
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:
>>
>> > Wayne, David, my question was unclear: I was referring to the
>> > optional PCB to
>> > be installed inside the K144XV on top of the tranverter PCB.
>> > The K144XV I already have. I am looking forward to the PLL function
>> > for
>> > locking the 116 MHz VCXO to the 49.380MHz. Is that project ongoing?
>>
>> In progress.
>>
>> Wayne
>> N6KR
>>
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