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Filter not sticking

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The Wizard

Filter not sticking

Please excuse me people because I am very new to the Elecraft world. Just got my K3 7890 on the air and love it so far with the following except. Yes there is always an except.

I have the following filter in my rig. 6kHz, 2.7kHz and 400 Hz for CW. I am one of the ESSB guys but I am also a DXer. I have worked them all on the number 1 ARRL DX Honor roll so I don’t want my rig to just do ESSB audio. I enjoy CW as well. SOOOO here is my problem and it is probably my fault because I don’t understand the K3 architecture yet.

When I have my 6kHz filter in line, all is well. Band width is 4K top at 4K bottom at 0.00 center frequency is 2.00. As long as I stay there all is well. I can narrow down my receive and transmit band width by turning the HI/Width knob counter clockwise and narrow it down that way.

But if I want to use the XFIL to select my second filter the 2.8kHz filter it will go down to a band width as it should and all is well. Here is the problem. When I do an XFIL back to the 6kHz filter it has now a center frequency of 1.5 and the band with is now about 3.5K. It does not remember how I had it set up and I have to manually reconfigure the filter back to how I want it.

It would be nice if I could be talking to my friends at maybe 4K and if some

DX comes on the band I would like to pop to my 2.8kHz filter, work the station, the go back to my normal chat setup without having to reconfigure it.

Now have any of you who have a 6kHz filter in position 1 and a 2.8kHz filter in position 2 test and see if your rig stays at 4K with a center frequency staying where you put it as you go back and forth? If yours does and mine does not, maybe there is something wrong with my rig or firmware.

Any help here? Thanks

From:
Larry Martus Wassmann
Non omnis moriar
(Not all of me will die) - - - The good I do will live forever.

www.w3oz.com
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Don Wilhelm-4

Re: Filter not sticking

Larry,

If I may suggest --
Stop using the XFIL button. For voice modes, set the filter control
knobs to LO Cut/Hi Cut.
Use Hi Cut to set the upper end of the audio bandpass and Lo Cut to set
the low end. The filter center will then be automatic and the filters
will switch in and out automatically following the filter width.

You will find that you can only cut the low end by up to 300 Hz or so
and maintain intelligibility. With the HI CUT, you can cut a lot and
still maintain an intelligible signal, even though it will loose its
individuality.

You may find it easier to use a macro to change the ESSB menu entry ON
and OFF, then you could manage the same thing using the PF1 or PF2
button -- I do not have a macro to do that so you would have to study
the Programmer's Reference to accomplish that.

BTW, the transmit will be full width through the chosen filter - the
filter knobs control only the received width.

73,
Don W3FPR

On 1/11/2014 7:39 AM, Larry Wassmann wrote:

> Please excuse me people because I am very new to the Elecraft world. Just got my K3 7890 on the air and love it so far with the following except. Yes there is always an except.
>
>
>
> I have the following filter in my rig. 6kHz, 2.7kHz and 400 Hz for CW. I am one of the ESSB guys but I am also a DXer. I have worked them all on the number 1 ARRL DX Honor roll so I don’t want my rig to just do ESSB audio. I enjoy CW as well. SOOOO here is my problem and it is probably my fault because I don’t understand the K3 architecture yet.
>
>
>
> When I have my 6kHz filter in line, all is well. Band width is 4K top at 4K bottom at 0.00 center frequency is 2.00. As long as I stay there all is well. I can narrow down my receive and transmit band width by turning the HI/Width knob counter clockwise and narrow it down that way.
>
>
>
> But if I want to use the XFIL to select my second filter the 2.8kHz filter it will go down to a band width as it should and all is well. Here is the problem. When I do an XFIL back to the 6kHz filter it has now a center frequency of 1.5 and the band with is now about 3.5K. It does not remember how I had it set up and I have to manually reconfigure the filter back to how I want it.
>
>
>
> It would be nice if I could be talking to my friends at maybe 4K and if some
>
> DX comes on the band I would like to pop to my 2.8kHz filter, work the station, the go back to my normal chat setup without having to reconfigure it.
>
>
>
> Now have any of you who have a 6kHz filter in position 1 and a 2.8kHz filter in position 2 test and see if your rig stays at 4K with a center frequency staying where you put it as you go back and forth? If yours does and mine does not, maybe there is something wrong with my rig or firmware.
>
>
>
> Any help here? Thanks
>
>

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Matt Zilmer-3

Re: Filter not sticking

In reply to this post by The Wizard

Hi Larry,

The XFIL control rotates through the roofing filters. When you
manually select a filter, its default center and passband are used.
This is described on p5 of the Owner's Manual.

Try reading the section "Filter Presets (I/II)", to understand the I
and II filter presets, and how they operate. You can also use NORM 1
and NORM 2, desribed in the "Filter Normalization" section. Any of
these methods allow customization on a per-mode bases while you're
operating.

In a way, XFIL is a holdover from the K2. It does allow changing the
filter in use, but it just changes to the default center and passband
for that filter.

73,
matt

Matt Zilmer, W6NIA
www.elecraft.com
831-763-4211 x129
Skype: matt.zilmer

On Sat, 11 Jan 2014 12:39:57 +0000, you wrote:

>
>Please excuse me people because I am very new to the Elecraft world. Just got my K3 7890 on the air and love it so far with the following except. Yes there is always an except.
>
>
>
>I have the following filter in my rig. 6kHz, 2.7kHz and 400 Hz for CW. I am one of the ESSB guys but I am also a DXer. I have worked them all on the number 1 ARRL DX Honor roll so I dont want my rig to just do ESSB audio. I enjoy CW as well. SOOOO here is my problem and it is probably my fault because I dont understand the K3 architecture yet.
>
>
>
>When I have my 6kHz filter in line, all is well. Band width is 4K top at 4K bottom at 0.00 center frequency is 2.00. As long as I stay there all is well. I can narrow down my receive and transmit band width by turning the HI/Width knob counter clockwise and narrow it down that way.
>
>
>
>But if I want to use the XFIL to select my second filter the 2.8kHz filter it will go down to a band width as it should and all is well. Here is the problem. When I do an XFIL back to the 6kHz filter it has now a center frequency of 1.5 and the band with is now about 3.5K. It does not remember how I had it set up and I have to manually reconfigure the filter back to how I want it.
>
>
>
>It would be nice if I could be talking to my friends at maybe 4K and if some
>
>DX comes on the band I would like to pop to my 2.8kHz filter, work the station, the go back to my normal chat setup without having to reconfigure it.
>
>
>
>Now have any of you who have a 6kHz filter in position 1 and a 2.8kHz filter in position 2 test and see if your rig stays at 4K with a center frequency staying where you put it as you go back and forth? If yours does and mine does not, maybe there is something wrong with my rig or firmware.
>
>
>
>Any help here? Thanks
>
>
>
>
>
>
>From:
> Larry Martus Wassmann
> Non omnis moriar
> (Not all of me will die) - - - The good I do will live forever.
>
>www.w3oz.com
>______________________________________________________________
>Elecraft mailing list
>Home: http://mailman.qth.net/mailman/listinfo/elecraft
>Help: http://mailman.qth.net/mmfaq.htm
>Post: mailto:[hidden email]
>
>This list hosted by: http://www.qsl.net
>Please help support this email list: http://www.qsl.net/donate.html