[Elecraft] Mildly confused - Assumed filter width and what I see in waterfall do not match

[Joe Subich, W4TV]

> I tried to set the USB filter bandwidth to 
> use the 6 KHz, but whenever I tried to XMIT I got an error.  
> Apparently the widest filter permitted for SSB XMIT is 2.7 
> KHz, and this setting also somehow restricts the 
> receive filter capability also.

The only filters permitted for SSB transmit are 2.7 or 2.8 Khz 
(unless you have enabled ESSB). 

> I had the same basic idea, but to use the 6 kHz wide flter 
> for receive in USB mode for use with the "wide" bandwidth 
> setting of WSJT, to be able to search a wider bandwidth for 
> callers on EME.

The maximum bandwidth permitted in data modes (or USB/LSB) 
is 4.0 KHz even with a 6 KHz filter.  The DSP is limited 
to a 4200 Hz high frequency cutoff in all modes except CW 
where the maximum frequency is about 2400 Hz. 

73, 

   ... Joe, W4TV 
 





> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Lance Collister
> Sent: Tuesday, January 06, 2009 10:22 AM
> To: tpbx at yahoo.com
> Cc: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] Mildly confused - Assumed filter 
> width and what I see in waterfall do not match
> 
> 
> Thomas Bingenheimer wrote:
> > I have been using several programs (Cocoamodem, mostly) to 
> do PSK31, 
> > via Data A. Instead of being able to use the full 4khz waterfall 
> > bandwidth available in, say, Cocoamodem, I have been limited to the 
> > available width in the only filter I had in the rig, the 2.7 khz 
> > 5-pole appeared to limit me to about 2.7 khz. So, I added the 6 khz 
> > filter, set it up for SSB (and enable ESSB, 4.0 khz). I now 
> show 3 khz 
> > (500 to 3500 hz) in the waterfall. I suspect I have overlooked 
> > something, but it is not clear to me what. Does anybody 
> have any idea? 
> > Thanks!
> > 
> > 
> > 
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> > 
> Hello Tom,
> 
> I had the same basic idea, but to use the 6 kHz wide flter 
> for receive in USB mode 
> for use with the "wide" bandwidth setting of WSJT, to be able 
> to search a wider 
> bandwidth for callers on EME.  I tried to set the USB filter 
> bandwidth to use the 
> 6 KHz, but whenever I tried to XMIT I got an error.  
> Apparently the widest filter 
> permitted for SSB XMIT is 2.7 KHz, and this setting also 
> somehow restricts the 
> receive filter capability also.
> 
> I have not figured it out yet for sure, but it seems that 
> there currently is no 
> way to open up the width of the receiver in USB past 4 kHz 
> :-(  It would sure be 
> more flexible  if there turns out to be some way to permit 
> wider filter 
> possibilities in receive!
> 
> Please let me know if you discover some way to do this - I am 
> sure there are 
> others besides us who also would be interested in this 
> option!  TNX and GL!  VY 
> 73, Lance
> 
> -- 
> Lance Collister, W7GJ (ex: WN3GPL, WA3GPL, WA1JXN, 
> WA1JXN/C6A, ZF2OC/ZF8) P.O. Box 73 Frenchtown, MT  59834  USA
> QTH: DN27UB
> TEL: (406) 626-5728   URL: http://www.bigskyspaces.com/w7gj
> 2m DXCC #11, 6m DXCC #815
> 
> 
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