ESSB and FM Filter selection for AM Transmit

[N2ZDB-2]

Wayne,
 
When I enable the FM filter for AM Transmit I get a "ERR TXF" indication  
when trying to transmit on SSB with ESSB enabled.  Will there be a fix for  
this?
 
Thank you,
 
Michael
n2zdb
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[wayne burdick]

Michael,

We allow the FM filter to be use for AM transmit, now, but not for  
ESSB transmit. The filter is too wide for this purpose.

73,
Wayne
N6KR

> Wayne,
>
> When I enable the FM filter for AM Transmit I get a "ERR TXF"  
> indication
> when trying to transmit on SSB with ESSB enabled.  Will there be a  
> fix for
> this?
>
> Thank you,
>
> Michael
> n2zdb

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[Thomas Horsten]

Wayne,

Have you actually measured the output when using the FM filter for ESSB
transmit? I'd have thought with the excellent design of the K3, the DSP
should provide enough bounding.

73, Thomas M0TRN

On 15 November 2012 18:57, Wayne Burdick <[hidden email]> wrote:

> Michael,
>
> We allow the FM filter to be use for AM transmit, now, but not for
> ESSB transmit. The filter is too wide for this purpose.
>
> 73,
> Wayne
> N6KR
>
> > Wayne,
> >
> > When I enable the FM filter for AM Transmit I get a "ERR TXF"
> > indication
> > when trying to transmit on SSB with ESSB enabled.  Will there be a
> > fix for
> > this?
> >
> > Thank you,
> >
> > Michael
> > n2zdb
>
>
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[Scott Manthe-2]

Wayne is right to restrict the use of the FM filter to non-ESSB
transmit. Too many "hi-fi" operators on 20 meters will be tempted to
transmit 13 kHz wide signals. No "fix" is necessary, in my opinion.

73,
Scott, N9AA

On 11/15/12 10:00 PM, Thomas Horsten wrote:
> Wayne,
>
> Have you actually measured the output when using the FM filter for ESSB
> transmit? I'd have thought with the excellent design of the K3, the DSP
> should provide enough bounding.
>
> 73, Thomas M0TRN
>
>

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[Joe Subich, W4TV-4]

 > Too many "hi-fi" operators on 20 meters will be tempted to
 > transmit 13 kHz wide signals.

It is not possible to transmit a 13 KHz wide signal as the DSP
will not generate ESSB more than 4 KHz wide (CONFIG:TX ESSB).

 > No "fix" is necessary, in my opinion.

The phase noise "pedestal" with the 13 KHz filter in ESSB (define
the filter as 6 KHz) is no worse than the typical upconversion rig.
Opposite sideband suppression is provided in the modulation process
(DSP) so there is no need to restrict ESSB to the 6 KHz filter

73,

    ... Joe, W4TV


On 11/15/2012 10:45 PM, Scott Manthe wrote:

> Wayne is right to restrict the use of the FM filter to non-ESSB
> transmit. Too many "hi-fi" operators on 20 meters will be tempted to
> transmit 13 kHz wide signals. No "fix" is necessary, in my opinion.
>
> 73,
> Scott, N9AA
>
> On 11/15/12 10:00 PM, Thomas Horsten wrote:
>> Wayne,
>>
>> Have you actually measured the output when using the FM filter for ESSB
>> transmit? I'd have thought with the excellent design of the K3, the DSP
>> should provide enough bounding.
>>
>> 73, Thomas M0TRN
>>
>>
>
> ______________________________________________________________
> Elecraft mailing list
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>
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> Please help support this email list: http://www.qsl.net/donate.html
>

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