[Elecraft] ESSB and FM Filter

[Joe Subich, W4TV]

 > 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
>>
>>
>
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