[Elecraft] K3 Filter Switching Problem?

[Ad Spaninks (PE1FTV)]

Just set FL1 to "OFF" in the config menu Henry. That will stop the strange
behaviour. BTW: FL1 should be the highest bandwidth and FL5 the most narrow
IIRC.

73,  Ad (pe1ftv)

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of k4tmc at aol.com
Sent: Tuesday, December 11, 2007 12:07 AM
To: elecraft at mailman.qth.net
Subject: [Elecraft] K3 Filter Switching Problem?


Warning! K3 filter use item follows.

Currently, I only have the standard 2.7 KHz filter in the FL3 slot on 
the RF board.  I chose this location due to potential future additions 
of the 2.1 and 1.8 KHz filters, in slots FL2 and FL1 respectively.

Here is what I observe: With FL3 manually selected via the XFIL button; 
when I try to rotate the Width control below a value of 2.7 KHz, the 
rig automatically switches to the FL1 position, which is empty.  The 
receiver goes dead.  When I quickly reverse the Width adjustment, FL3 
is not switched back.  I have to manually select FL3 again with the 
XFIL button.  Once back in FL3, I can adjust the Width control to 
higher values above 2.7 KHz with no problem and the passband gets wider.

Is this normal?  I thought the DSP circuit would continue to narrow the 
passband even though the roofing filter is broader.  But, why does it 
switch to an empty filter slot?  Did I do something wrong during the 
Configuration setup?

Is this a firmware issue?  I have not downloaded the latest updates yet.

If I had narrower filters in the FL1 and FL2 slots, then I would expect 
the circuit to auto-switch to those as I narrowed the passband via the 
Width control.  And, they should switch back in reverse order as I 
widen the passband.  Right?

73,
Henry - K4TMC
K3 #98