[Elecraft] K2 Filter settings

[Matt Maguire]

Unfortunately the shift in dial calibration between filter settings is due to the limited resolution of the DAC converters that control the BFO. It is a design compromise, not much you can do about it.

If you adjust the reference oscillator, eg. by using Wayne’s procedure, then you need to run the CAL PLL and CAL FIL procedures again to update the firmware parameters. So, if you modify the filter settings such as the skirt positions, don’t run Wayne’s process again, or you’ll need to repeat the CAL PLL/CAL FIL procedures.

-- 
73 de Matt VK2RQ

On 3 March 2015 at 3:11:58 am, Gareth - M5KVK (m5kvk at m5kvk.org) wrote:

I realise this is close to becoming an obsession, but I really want to  
understand what's going on.  

Once I'd gone through my modified version of Wayne's process for adjusting  
the VCO (i.e. adjusting the VFO to have the WWV 100Hz sub-carrier on  
100Hz), I realised that this applied only to LSB FIL1. As soon as I  
switched to FIL2, the sub-carrier moved and I needed to use CAL FIL to  
adjust it back.  

Also, if you want to move the position of the filter in the audio spectrum  
(e.g. to change where the skirts are), and thus change the BFO; you need to  
run Wayne's process again.  

Is that right?  

73, Gareth - M5KVK  
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