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

[Thomas Bingenheimer]

This is what has disturbed me - I have turned on ESSB (set to 4 khz), and I have selected the 6 khz filter, but in no case do I get 4 khz in any mode. specifically, in Data A with DSP set wide open at 4 khz, the waterfall always cuts off at 3500 hz in any software I use. I do not understand why I cannot get the full 4 khz bandwidth. The firmware is at 2.67, DSP at 1.96. Does anyone see 4khz in the waterfall, and with the ability to xmit across the range? 


--- On Wed, 1/7/09, Joe Subich, W4TV <lists at subich.com> wrote:

> From: Joe Subich, W4TV <lists at subich.com>
> Subject: RE: [Elecraft] Mildly confused - Assumed filter width and what I see in waterfall do not match
> To: w7gj at q.com, tpbx at yahoo.com
> Cc: elecraft at mailman.qth.net
> Date: Wednesday, January 7, 2009, 12:59 AM
> > 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!
> > > 
> > > 
> > > 
> > > _______________________________________________
> Elecraft 
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> Elecraft web page: 
> > > http://www.elecraft.com
> > > 
> > > 
> > 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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