[Elecraft] FM Filter for AM?

[Bob Naumann]

Wayne,

Am I correct in my understanding that the reason the 2.1 is not currently
allowed is simply a firmware issue?

If it is indeed technically OK to use the 2.1 instead of the 2.7 or 2.8, yes
- I would like that option to be available. 

I was surprised that after removing the 2.7 and installing the 2.1 that its
selection as a transmit filter was precluded.

The 2.1 is much better than the 2.7 for SSB reception, and if it is OK to
transmit through, I would not need to waste a filter slot on the 2.7.

73,

Bob W5OV






-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Wayne Burdick
Sent: Friday, October 08, 2010 11:56 AM
To: Bob Naumann
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] FM Filter for AM?

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?



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