[Elecraft] K3 SSB Possible Filter Set XFIL option

[Joe Subich, W4TV]

> 	The other (and maybe easier for me) alternative is
> software macros which I have not looked into yet. I don't 
> think any control program at the moment will directly set 
> the DSP filters.

Unfortunately, the command set does not (yet) implement the 
Kenwood SL/SH (low cut and high cut) commands or provide a 
way to set the filter center frequency (e.g., FCxxxx;) ... if 
there is a way, I can't find it.  SL/SH or FW/FC are needed to 
properly adjust SSB filtering.  FW alone works reasonably well 
for CW since it uses the existing center frequency but in SSB 
the "center frequency" needs decrease with the bandwidth - most 
of the benefit from narrow SSB filtering is in getting rig of 
extra high frequency noise. 

73, 

   ... Joe, W4TV 
   


> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Tony 
> Fegan VE3QF
> Sent: Monday, September 15, 2008 11:17 PM
> To: microham at microham-usa.com
> Cc: '[Elecraft]'
> Subject: Re: [Elecraft] K3 SSB Possible Filter Set XFIL option
> 
> 
> Hi Lyle, Joe,
> 
> 	Yes I have used Norm 1 and Norm 2. It works fairly well
> but it's not 
> easy for me as sometimes I hold on too long and usually end 
> up with both 
> set the same. Others have reported the same problem. A longer 
> hold for 
> save might help here.
> 	I have 13KHz (not used on SSB) , 2.7KHz, 2.1KHz, 1.8KHz 
> and 400Hz (not 
> for SSB) filters installed. The centre frequency is not 
> positioned for 
> clearest audio on the narrower filters. This means juggling 
> with shift 
> and high cut which is not easy for me. This is what I want to 
> get away from.
> 	I assume that Norm 0 is the same setting as using XFIL 
> button for 
> 2.7/2.8KHz and is not a problem.
> 	My best way of getting 3 preset filters is to use Norm 
> 0, Norm 1 and 
> Norm 2. For SSB dx working I can put a narrower Norm 1 and 
> Norm 2 into 
> I/II and switch with one push of the I/II knob. I operate the 
> Norm 1/2 
> button with the flat of my thumb and lift my arm up and down 
> to rotate. 
> Not easy but it usually works. I would like to try bigger and longer 
> knobs but am not sure of the shaft size. 1, 2 or 3 taps on a button 
> (XFIL) would be much easier and quicker.
> 	The other (and maybe easier for me) alternative is 
> software macros 
> which I have not looked into yet. I don't think any control 
> program at 
> the moment will directly set the DSP filters.
> 
> 	Hope this makes sense.
> 
> 73
> 	Tony VE3QF
> 
> Joe Subich, W4TV wrote:
> >> 	The “XFIL” button is not useful on SSB.
> > 
> > The XFIL button is usable on SSB if you have installed multiple SSB 
> > bandwidth "roofing" filters (e.g. 2.8, 2.4 and 1.8 KHz).
> > 
> >> Could this button be used to recall a number of user settable DSP 
> >> bandwidths and offsets?  Tap to recall, 3sec hold to store
> and 8sec
> >> hold to clear or set/assign/name via config.
> > 
> > This function is already available via the shift/Lo encoder - Norm, 
> > Norm 1 and Norm 2.  Separate values of Norm 1 and Norm 2 can be 
> > saved for each mode. It would be handy to be able to customize the 
> > "Norm 0" values as well and perhaps be able to define PF1/PF2 to 
> > recall Norm1/Norm2 without going through the hold/twist routine.
> >