[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:
  >> 
  >> &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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