Elecraft

re bandwidth select on am mode re K3

Classic

List

Threaded

16 messages Options

Dave, G4AON

re bandwidth select on am mode re K3

It's been noted previously, with the excuse that 3 KHz is the upper
audio limit. I also think it's confusing and should show the overall
bandwidth, i.e. 6 KHz like it does on SSB when you have the AM filter
available.

73 Dave, G4AON
K3/100 #80
-------------------
On my K3, on ssb mode, I can select the wide am filter position but if I
go to the AM mode, the widest bandwidth shown on the display is 3 khz!
Should it not go to 6 khz as I do have that filter installed and it
works on the ssb and other modes except for the AM mode. Any
clarification or help with this would be greatly appreciated.
Thanks from Fern
_______________________________________________
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

Joe Subich, W4TV-3

RE: re bandwidth select on am mode re K3

> I also think it's confusing and should show the overall
> bandwidth, i.e. 6 KHz like it does on SSB when you have the AM filter
> available.

As Wayne has repeatedly stated, the K3 shows the audio bandwidth -
not the RF bandwidth. Since the AM mode does not support VSB
(vestigial side band) or ISB (independent side band) the reporting
is consistent.

I would very much like to see the K3 support VSB-U and VSB-L (offset
the display/carrier to the lower/upper -6dB points of the filter
respectively and demodulate only the one sideband). That provide
enhanced fidelity and the opportunity to eliminate QRM from one
side or the other. With DSP demodulation it should be relatively
easy to implement.

73,

... Joe, W4TV

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Dave G4AON
> Sent: Wednesday, March 26, 2008 1:35 PM
> To: [hidden email]
> Subject: [Elecraft] re bandwidth select on am mode re K3
>
>
> It's been noted previously, with the excuse that 3 KHz is the upper
> audio limit. I also think it's confusing and should show the overall
> bandwidth, i.e. 6 KHz like it does on SSB when you have the AM filter
> available.
>
> 73 Dave, G4AON
> K3/100 #80
> -------------------
> On my K3, on ssb mode, I can select the wide am filter
> position but if I
> go to the AM mode, the widest bandwidth shown on the display
> is 3 khz!
> Should it not go to 6 khz as I do have that filter installed and it
> works on the ssb and other modes except for the AM mode. Any
> clarification or help with this would be greatly appreciated.
> Thanks from Fern
> _______________________________________________
> 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

Jim-168

RE: re bandwidth select on am mode re K3

So to make everyone happy a simple way to explain is 3.00 = 6.00

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Joe Subich, W4TV
Sent: Wednesday, March 26, 2008 3:00 PM
To: 'Dave G4AON'; [hidden email]
Subject: RE: [Elecraft] re bandwidth select on am mode re K3

> I also think it's confusing and should show the overall
> bandwidth, i.e. 6 KHz like it does on SSB when you have the AM filter
> available.

As Wayne has repeatedly stated, the K3 shows the audio bandwidth -
not the RF bandwidth. Since the AM mode does not support VSB
(vestigial side band) or ISB (independent side band) the reporting
is consistent.

I would very much like to see the K3 support VSB-U and VSB-L (offset
the display/carrier to the lower/upper -6dB points of the filter
respectively and demodulate only the one sideband). That provide
enhanced fidelity and the opportunity to eliminate QRM from one
side or the other. With DSP demodulation it should be relatively
easy to implement.

73,

... Joe, W4TV

Fern Rivard

Re: re bandwidth select on am mode re K3

Well, it would have made things a lot simpler had them made the display show 6 khz rather than 3 khz. Fern

----- Original Message -----
From: "Jim" <[hidden email]>
To: <[hidden email]>
Sent: Wednesday, March 26, 2008 1:04 PM
Subject: RE: [Elecraft] re bandwidth select on am mode re K3

So to make everyone happy a simple way to explain is 3.00 = 6.00

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Joe Subich, W4TV
Sent: Wednesday, March 26, 2008 3:00 PM
To: 'Dave G4AON'; [hidden email]
Subject: RE: [Elecraft] re bandwidth select on am mode re K3

> I also think it's confusing and should show the overall
> bandwidth, i.e. 6 KHz like it does on SSB when you have the AM filter
> available.

As Wayne has repeatedly stated, the K3 shows the audio bandwidth -
not the RF bandwidth. Since the AM mode does not support VSB
(vestigial side band) or ISB (independent side band) the reporting
is consistent.

I would very much like to see the K3 support VSB-U and VSB-L (offset
the display/carrier to the lower/upper -6dB points of the filter
respectively and demodulate only the one sideband). That provide
enhanced fidelity and the opportunity to eliminate QRM from one
side or the other. With DSP demodulation it should be relatively
easy to implement.

73,

... Joe, W4TV

_______________________________________________
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

_______________________________________________
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

--
No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.5.516 / Virus Database: 269.22.0/1344 - Release Date: 3/26/2008 8:52 AM

_______________________________________________
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

Joe Subich, W4TV-3

RE: re bandwidth select on am mode re K3

> Well, it would have made things a lot simpler had them
> made the display show 6 khz rather than 3 khz.

But it's not 6 KHz ... it's 3 KHz audio bandwidth and that is
what is shown on the display. The DSP bandwidth is not the
same as the RF/roofing filter bandwidth.

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Fern Rivard
> Sent: Wednesday, March 26, 2008 4:03 PM
> To: Jim; [hidden email]
> Subject: Re: [Elecraft] re bandwidth select on am mode re K3
>
>
> Well, it would have made things a lot simpler had them
> made the display show 6 khz rather than 3 khz. Fern
>
>
> ----- Original Message -----
> From: "Jim" <[hidden email]>
> To: <[hidden email]>
> Sent: Wednesday, March 26, 2008 1:04 PM
> Subject: RE: [Elecraft] re bandwidth select on am mode re K3
>
>
> So to make everyone happy a simple way to explain is 3.00 = 6.00
>
> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Joe
> Subich, W4TV
> Sent: Wednesday, March 26, 2008 3:00 PM
> To: 'Dave G4AON'; [hidden email]
> Subject: RE: [Elecraft] re bandwidth select on am mode re K3
>
>
> > I also think it's confusing and should show the overall
> > bandwidth, i.e. 6 KHz like it does on SSB when you have the
> AM filter
> > available.
>
> As Wayne has repeatedly stated, the K3 shows the audio bandwidth -
> not the RF bandwidth. Since the AM mode does not support VSB
> (vestigial side band) or ISB (independent side band) the reporting
> is consistent.
>
> I would very much like to see the K3 support VSB-U and VSB-L (offset
> the display/carrier to the lower/upper -6dB points of the filter
> respectively and demodulate only the one sideband). That provide
> enhanced fidelity and the opportunity to eliminate QRM from one
> side or the other. With DSP demodulation it should be relatively
> easy to implement.
>
> 73,
>
> ... Joe, W4TV
>
>
>
> > -----Original Message-----
> > From: [hidden email]
> > [mailto:[hidden email]] On Behalf Of Dave G4AON
> > Sent: Wednesday, March 26, 2008 1:35 PM
> > To: [hidden email]
> > Subject: [Elecraft] re bandwidth select on am mode re K3
> >
> >
> > It's been noted previously, with the excuse that 3 KHz is the upper
> > audio limit. I also think it's confusing and should show
> the overall
> > bandwidth, i.e. 6 KHz like it does on SSB when you have the
> AM filter
> > available.
> >
> > 73 Dave, G4AON
> > K3/100 #80
> > -------------------
> > On my K3, on ssb mode, I can select the wide am filter
> > position but if I
> > go to the AM mode, the widest bandwidth shown on the display
> > is 3 khz!
> > Should it not go to 6 khz as I do have that filter installed and it
> > works on the ssb and other modes except for the AM mode. Any
> > clarification or help with this would be greatly appreciated.
> > Thanks from Fern
> > _______________________________________________
> > 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
>
> _______________________________________________
> 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
>
> _______________________________________________
> 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
>
>
> --
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.516 / Virus Database: 269.22.0/1344 - Release
> Date: 3/26/2008 8:52 AM
>
>
> _______________________________________________
> 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

Julian, G4ILO

RE: re bandwidth select on am mode re K3

Joe Subich, W4TV-3 wrote

But it's not 6 KHz ... it's 3 KHz audio bandwidth and that is
what is shown on the display. The DSP bandwidth is not the
same as the RF/roofing filter bandwidth.

But it's 6KHz of RF that the signal is decoded from. 6KHz worth of band noise and QRM will be present.

I'm not even sure you're correct in saying the DSP bandwidth is 3KHz. This is IF DSP, isn't it, not AF DSP as in the K2?

Julian, G4ILO. K2 #392 K3 #222 KX3 #110
* G4ILO's Shack - http://www.g4ilo.com
* KComm - http://www.g4ilo.com/kcomm.html
* KTune - http://www.g4ilo.com/ktune.html

Joe Subich, W4TV-3

RE: re bandwidth select on am mode re K3

> I'm not even sure you're correct in saying the DSP bandwidth
> is 3KHz. This is IF DSP, isn't it, not AF DSP as in the K2?

As Wayne has repeatedly stated here the bandwidth display is
AUDIO bandwidth i.e., the output of the DSP. If you get it
through your head that the bandwidth display shows the audio
bandwidth, the current display is correct in all modes without
any change. I do not know if/how that will change when FM is
enabled.

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of G4ILO
> Sent: Thursday, March 27, 2008 6:20 AM
> To: [hidden email]
> Subject: RE: re [Elecraft] bandwidth select on am mode re K3
>
>
>
>
> Joe Subich, W4TV-3 wrote:
> >
> > But it's not 6 KHz ... it's 3 KHz audio bandwidth and that is
> > what is shown on the display. The DSP bandwidth is not the
> > same as the RF/roofing filter bandwidth.
> >
> But it's 6KHz of RF that the signal is decoded from. 6KHz
> worth of band noise and QRM will be present.
>
> I'm not even sure you're correct in saying the DSP bandwidth
> is 3KHz. This is IF DSP, isn't it, not AF DSP as in the K2?
>
> -----
> Julian, G4ILO K3 s/n: 222 K2 s/n: 392
> G4ILO's Shack: www.g4ilo.com
> Zerobeat Ham Forums: www.zerobeat.net/smf
> --
> View this message in context:
> http://www.nabble.com/re-bandwidth-select-on-am-mode-re-K3-tp1

6310886p16323716.html
Sent from the Elecraft mailing list archive at Nabble.com.

_______________________________________________
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

_______________________________________________
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

Eric Swartz - WA6HHQ

RE: re bandwidth select on am mode re K3

Administrator

In reply to this post by Julian, G4ILO

We actually have -both- IF and AF DSP filtering in tandem in the K3 for best performance. The confusion came about because we chose to display the audio b/w, which is 1/2 of the IF b/w for AM. (2 identical sidebands in AM.) Of course in SSB the IF b/w and the Audio b/w are the same since SSB only has one sideband, so there was no confusion there.

In response to popular demand, we're going to increase the AM b/w display 2X to match the IF b/w in the next K3 s/w release. :-) So for the 6 kHz AM filter it will display 6 kHz max instead of 3 kHz.

73, Eric WA6HHQ
----

G4ILO wrote

Joe Subich, W4TV-3 wrote

But it's not 6 KHz ... it's 3 KHz audio bandwidth and that is
what is shown on the display. The DSP bandwidth is not the
same as the RF/roofing filter bandwidth.

But it's 6KHz of RF that the signal is decoded from. 6KHz worth of band noise and QRM will be present.

I'm not even sure you're correct in saying the DSP bandwidth is 3KHz. This is IF DSP, isn't it, not AF DSP as in the K2?

Joe Subich, W4TV-3

RE: re bandwidth select on am mode re K3

> In response to popular demand, we're going to increase the AM
> b/w display 2X to match the IF b/w in the next K3 s/w
> release. :-) So for the 6 kHz AM filter it will display 6
> kHz max instead of 3 kHz.

Of course, the next set of complaints will be "My filter display
says 6 KHz, why is my AM audio response so narrow? On every other
mode it shows me the high/low cut frequencies."

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of ERic - WA6HHQ
> Sent: Thursday, March 27, 2008 1:57 PM
> To: [hidden email]
> Subject: RE: re [Elecraft] bandwidth select on am mode re K3
>
>
>
> We actually have -both- IF and AF DSP filtering in tandem in
> the K3 for best performance. The confusion came about because
> we chose to display the audio b/w, which is 1/2 of the IF b/w
> for AM. (2 identical sidebands in AM.) Of course in SSB the
> IF b/w and the Audio b/w are the same since SSB only has one
> sideband, so there was no confusion there.
>
> In response to popular demand, we're going to increase the AM
> b/w display 2X to match the IF b/w in the next K3 s/w
> release. :-) So for the 6 kHz AM filter it will display 6
> kHz max instead of 3 kHz.
>
> 73, Eric WA6HHQ
> ----
>
>
> G4ILO wrote:
> >
> >
> > Joe Subich, W4TV-3 wrote:
> >>
> >> But it's not 6 KHz ... it's 3 KHz audio bandwidth and that is
> >> what is shown on the display. The DSP bandwidth is not the
> >> same as the RF/roofing filter bandwidth.
> >>
> > But it's 6KHz of RF that the signal is decoded from. 6KHz worth of
> > band noise and QRM will be present.
> >
> > I'm not even sure you're correct in saying the DSP
> bandwidth is 3KHz.
> > This is IF DSP, isn't it, not AF DSP as in the K2?
> >
>
> --
> View this message in context:
> http://www.nabble.com/re-bandwidth-select-on-am-mode-re-K3-tp1

6310886p16329491.html
Sent from the Elecraft mailing list archive at Nabble.com.

_______________________________________________
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

_______________________________________________
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

AD6XY

RE: re bandwidth select on am mode re K3

In reply to this post by Eric Swartz - WA6HHQ

Great - But why only 6kHz and why can't one use the FM filter? It should still be as good if not better than a normal communications receiver.

While I am at it - I want 10kHz audio bandwidth on SSB. This is for decoding DRM.

Mike

Eric - WA6HHQ wrote

In response to popular demand, we're going to increase the AM b/w display 2X to match the IF b/w in the next K3 s/w release. :-) So for the 6 kHz AM filter it will display 6 kHz max instead of 3 kHz.

73, Eric WA6HHQ
----

KK7P

Re: re bandwidth select on am mode re K3

> Great - But why only 6kHz

The example was using the 6 kHz AM filter.

> and why can't one use the FM filter?

One can. My K3 is tuned to AM broadcast right now with more than 10 kHz
of IF and more than 5 kHz of AF bandwidth, using the FM filter and
MCU+DSP firmware that is currently in field test.

73,

Lyle KK7P

_______________________________________________
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

Don Brown-4

Re: re bandwidth select on am mode re K3

In reply to this post by AD6XY

Hi

Well for now even with the FM filter you are limited to 6Khz on AM. But
there is a new version coming that will allow more bandwidth per an email
from Lyle

Don Brown
KD5NDB
K3 s/n 0575
with FM filter

--------------------------------------------------
From: "AD6XY - Mike" <[hidden email]>
Sent: Thursday, March 27, 2008 3:55 PM
To: <[hidden email]>
Subject: RE: re [Elecraft] bandwidth select on am mode re K3

>
> Great - But why only 6kHz and why can't one use the FM filter? It should
> still be as good if not better than a normal communications receiver.
>
> While I am at it - I want 10kHz audio bandwidth on SSB. This is for
> decoding
> DRM.
>
> Mike
>
>
> Eric - WA6HHQ wrote:
>>
>>
>> In response to popular demand, we're going to increase the AM b/w display
>> 2X to match the IF b/w in the next K3 s/w release. :-) So for the 6 kHz
>> AM filter it will display 6 kHz max instead of 3 kHz.
>>
>> 73, Eric WA6HHQ
>> ----
>>
>>
>
> --
> View this message in context:
> http://www.nabble.com/re-bandwidth-select-on-am-mode-re-K3-tp16310886p16334548.html
> Sent from the Elecraft mailing list archive at Nabble.com.
>
> _______________________________________________
> 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
>

Joe Subich, W4TV-3

RE: re bandwidth select on am mode re K3

In reply to this post by KK7P

Lyle,

> > and why can't one use the FM filter?

What deviation (bandwidth) is used for FM on 10 meters? Would
a 6 KHz filter work there or are the "channels" overlapping?

73,

... Joe, W4TV

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Lyle Johnson
> Sent: Thursday, March 27, 2008 5:06 PM
> To: AD6XY - Mike
> Cc: [hidden email]
> Subject: Re: re [Elecraft] bandwidth select on am mode re K3
>
>
> > Great - But why only 6kHz
>
> The example was using the 6 kHz AM filter.
>
> > and why can't one use the FM filter?
>
> One can. My K3 is tuned to AM broadcast right now with more
> than 10 kHz
> of IF and more than 5 kHz of AF bandwidth, using the FM filter and
> MCU+DSP firmware that is currently in field test.
>
> 73,
>
> Lyle KK7P
>
> _______________________________________________
> 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

Ken Kopp-3

10M FM bandwidth

The accepted FM deviation on 10M and up is +/- 5 kHz

73! Ken Kopp - K0PP
[hidden email]

_______________________________________________
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

KK7P

Re: re bandwidth select on am mode re K3

In reply to this post by Joe Subich, W4TV-3

> What deviation (bandwidth) is used for FM on 10 meters? Would
> a 6 KHz filter work there or are the "channels" overlapping?

For Amateur FM operation, the K3 FM filter is required. Occupied
bandwidth of the usual signal is nearly 13 kHz, the width of the K3 FM
filter. Use of a 6 kHz filter results in horrendous distortion on both
Tx and Rx.

73,

Lyle KK7P

_______________________________________________
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

Joe Subich, W4TV-3

RE: re bandwidth select on am mode re K3

> For Amateur FM operation, the K3 FM filter is required.
> Occupied bandwidth of the usual signal is nearly 13 kHz,
> the width of the K3 FM filter. Use of a 6 kHz filter
> results in horrendous distortion on both Tx and Rx.

OK, that makes "sense" in terms of old standards. It seems
strange not to use 2 KHz deviation (6 KHz bandwidth) to allow
better spectrum utilization but that's a subject for another
forum.

73,

... Joe, W4TV

> -----Original Message-----
> From: Lyle Johnson [mailto:[hidden email]]
> Sent: Thursday, March 27, 2008 6:53 PM
> To: Joe Subich, W4TV
> Cc: [hidden email]
> Subject: Re: re [Elecraft] bandwidth select on am mode re K3
>
>
> > What deviation (bandwidth) is used for FM on 10 meters? Would
> > a 6 KHz filter work there or are the "channels" overlapping?
>
> For Amateur FM operation, the K3 FM filter is required. Occupied
> bandwidth of the usual signal is nearly 13 kHz, the width of
> the K3 FM
> filter. Use of a 6 kHz filter results in horrendous
> distortion on both
> Tx and Rx.
>
> 73,
>
> Lyle KK7P
>