Elecraft › [K3]

K3: FM filter bandwidth in other modes

Classic

List

Threaded

4 messages Options

Stephen Prior

K3: FM filter bandwidth in other modes

I have just fitted the FM filter to finish off my complement (now 13, 6,
2.7, 0.5 and 0.25). I used the K3 utility to set the bandwidth (13kHz) and
I have all the square boxes ticked (checked) so that, in my understanding I
should be able to go up to the full bandwidth of the filter in all my other
modes should I wish.

However, whether I use the width control or the xfil button, the FM filter
(in FL1 of course) cannot be brought into play, the width simply stops at
the width it did prior to fitting the FM filter.

It's no big deal, I bought the FM filter to play on the top end of 10m from
time-to-time, not to use enormous receive bandwidths in other modes, however
I was of the belief that the full width should be usable in every mode so
long as it is enabled on a per mode basis.

I am wondering if there is something I have overlooked, and 'yes', I've read
the manual! I am on the latest beta firmware.

73 Stephen

G4SJP K3#980.

______________________________________________________________
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

Joe Subich, W4TV-4

Re: K3: FM filter bandwidth in other modes

The K3 DSP maxes out at 4 KHz on SSB and 2.8 KHz on CW.
With those limitations, the widest roofing filters that
will be selected are 2.8 KHz on CW and 6 KHz on SSB.

The FM filter can be selected in AM (BW > 3 KHz audio).

73,

... Joe, W4TV

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Stephen Prior
> Sent: Friday, October 16, 2009 1:10 PM
> To: elecraft
> Subject: [Elecraft] K3: FM filter bandwidth in other modes
>
>
> I have just fitted the FM filter to finish off my complement
> (now 13, 6, 2.7, 0.5 and 0.25). I used the K3 utility to set
> the bandwidth (13kHz) and I have all the square boxes ticked
> (checked) so that, in my understanding I should be able to go
> up to the full bandwidth of the filter in all my other modes
> should I wish.
>
> However, whether I use the width control or the xfil button,
> the FM filter (in FL1 of course) cannot be brought into play,
> the width simply stops at the width it did prior to fitting
> the FM filter.
>
> It's no big deal, I bought the FM filter to play on the top
> end of 10m from time-to-time, not to use enormous receive
> bandwidths in other modes, however I was of the belief that
> the full width should be usable in every mode so long as it
> is enabled on a per mode basis.
>
> I am wondering if there is something I have overlooked, and
> 'yes', I've read the manual! I am on the latest beta firmware.
>
> 73 Stephen
>
> G4SJP K3#980.
>
>
>
>
> ______________________________________________________________
> 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

______________________________________________________________
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

Stephen Prior

Re: K3: FM filter bandwidth in other modes

In reply to this post by Stephen Prior

I have just realised my mistake. I can find no reference to it in the
manual but in searching the archives (again) I found a posting which
mentioned the 4.2kHz (AFAIR) bandwidth limit imposed by the DSP. So, it
would seem that things are working as they should- I was confused by the
filter setup which apparently allows the setting of bandwidths higher than
this on all modes.

Have I got this right?

73 Stephen G4SJP

On 16/10/2009 18:10, "Stephen Prior" <[hidden email]> wrote:

>
> I have just fitted the FM filter to finish off my complement (now 13, 6,
> 2.7, 0.5 and 0.25). I used the K3 utility to set the bandwidth (13kHz) and
> I have all the square boxes ticked (checked) so that, in my understanding I
> should be able to go up to the full bandwidth of the filter in all my other
> modes should I wish.
>
> However, whether I use the width control or the xfil button, the FM filter
> (in FL1 of course) cannot be brought into play, the width simply stops at
> the width it did prior to fitting the FM filter.
>
> It's no big deal, I bought the FM filter to play on the top end of 10m from
> time-to-time, not to use enormous receive bandwidths in other modes, however
> I was of the belief that the full width should be usable in every mode so
> long as it is enabled on a per mode basis.
>
> I am wondering if there is something I have overlooked, and 'yes', I've read
> the manual! I am on the latest beta firmware.
>
> 73 Stephen
>
> G4SJP K3#980.
>
>
>
>
> ______________________________________________________________
> 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
>

Stephen Prior

Re: K3: FM filter bandwidth in other modes

In reply to this post by Joe Subich, W4TV-4

Thanks Joe,

Your reply arrived as I was typing my reply to my own original posting,
after having found the information in the archive!

Many thanks, it's clear in my mind now.

73 Stephen

On 16/10/2009 22:16, "Joe Subich, W4TV" <[hidden email]> wrote:

>
>
> The K3 DSP maxes out at 4 KHz on SSB and 2.8 KHz on CW.
> With those limitations, the widest roofing filters that
> will be selected are 2.8 KHz on CW and 6 KHz on SSB.
>
> The FM filter can be selected in AM (BW > 3 KHz audio).
>
> 73,
>
> ... Joe, W4TV