K3 Filter Switching Problem?

[k4tmc]

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
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[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: [hidden email]
[mailto:[hidden email]] On Behalf Of [hidden email]
Sent: Tuesday, December 11, 2007 12:07 AM
To: [hidden email]
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

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[k4tmc]

You K3 guys are great!  Thanks for the quick responses.

I had not set all of the FL1 positions to OFF during the filter setup
activity.

It pays to read carefully, and then re-read, some of those instructions.

The Width function now operates as I was expecting.

73,
Henry - K4TMC
K3 #98

-----Original Message-----
From: [hidden email]
To: [hidden email]
Sent: Mon, 10 Dec 2007 6:06 pm
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

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[Craig Rairdin]

> BTW: FL1 should be the highest bandwidth and FL5 the most narrow

Other way around, but it actually doesn't matter. Any filter can be in any
slot and the DSP will select the right one as you crank the bandwidth down.
The reason for keeping them in some order is so that when you rotate through
them with XFIL they'll make sense (i.e. they get narrower and narrower each
time you press, then when you're at your narrowest the next press takes you
to your widest).

Craig
NZ0R
K3/100 #25


-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Ad Spaninks (PE1FTV)
Sent: Monday, December 10, 2007 5:30 PM
To: [hidden email]; [hidden email]
Subject: RE: [Elecraft] K3 Filter Switching Problem?


 
Just set FL1 to "OFF" in the config menu Henry. That will stop the strange
behaviour.

73,  Ad (pe1ftv)


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[Matt Zilmer]

I suggest you submit this directly to [hidden email].   It
sounds like a bug.  Or perhaps an omission from the Owner's Manual.

73,

matt - WA6EGJ
K3 # 24

>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
>________________________________________________________________________
>More new features than ever.  Check out the new AOL Mail ! -
>http://o.aolcdn.com/cdn.webmail.aol.com/mailtour/aol/en-us/text.htm?ncid=aolcmp00050000000003
>_______________________________________________
>Elecraft mailing list
>Post to: [hidden email]
>You must be a subscriber to post to the list.
>Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft   
>
>Help: http://mailman.qth.net/subscribers.htm
>Elecraft web page: http://www.elecraft.com

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