[Elecraft] Is this normal behavior (CW filter or BFO setup)

[Dave Gingrich K9DC]

On Wednesday, Jan 22, 2003, at 23:06 America/Indianapolis, Andreas 
Hofmann wrote:

> Hi,
>
> I just finished the A2B mods and don't recall this happening before. A
> CW signal (CW normal, FL1, AF OFF, AGC ON, PRE ON) seems to come back
> after I tune the VFO into its 0 Hz tone...  Example:
>
> Tuning down...
> 1. 7,061.28 CW signal appears, very high AF frequency
> 2. 7,060.12 signal is in middle of passband (used SPOT to zero beat)
> 3. 7,059.50 audio signal is at 0 Hz
> 4. 7,059.39 audio signal starts to be readable again
> 5. 7,058.95 audio signal disappears
>
> On frequency 4 and 5, I did not expect the signal to be audible.  This
> makes it very difficult to tune into the right frequency. Something's
> gotta be wrong here...  I did the filter setup using spectrogram.
>
> Only FL1 without AF seems to be wide enough to make this issue appear.

Sounds pretty normal to me, particularly if you have chosen a low 
offset (sidetone pitch).  That is one of the reasons I chose 800 Hz 
offset. I actually wouldn't mind at all, if it could be higher, but 800 
is okay.  But to avoid hearing any signal on the opposite side of 
correct, you will have to slide the passband up the good side a bit.  
The other solution (which you have already observed) is to not use FL1. 
For casual tuning around, I generally use the CW filter set to 1.5 KHz.

===========================
Dave Gingrich, K9DC
Indianapolis, Indiana USA
===========================