[Elecraft] FM Filter for AM?

[Joe Subich, W4TV]

 > Similarly, I assume a 6 kHz filter for TX in AM and ESSB modes.

That's a problematic assumption.  If one has 2.7 or 2.8 plus a
narrow SSB filter (1.5/1.8) a normal CW/RTTY filter and a narrow
CW filter there is simply no way to support both FM (4.5 KHz DSB
AM RX) and normal AM filters.  Since the combination of the FM
filter and DSP is more than satisfactory for reduced bandwidth
AM, the FM filter should be supported for AM/ESSB transmit when
the available filter slots are otherwise occupied.

73,

    ... Joe, W4TV

On 10/8/2010 12:56 PM, Wayne Burdick wrote:
> Bob,
>
> I could change all of the transmit filter bandwidth restrictions in
> firmware, and this is on my list. But it would be a complex change, and
> I have to weigh it against many competing firmware change requests. I
> assume the presence of a 2.7 or 2.8 kHz filter in all of the
> frequency-setting algorithms for SSB, CW, and DATA modes. Similarly, I
> assume a 6 kHz filter for TX in AM and ESSB modes.
>
> 73,
> Wayne
> N6KR
>
> Bob Naumann wrote:
>
>> Can someone explain why this restriction exists?
>>
>> *Why* can't you transmit through a 2.1 filter for example. *Why* is it
>> precluded?
>
>
>
>