[Elecraft] K3 AM vs FM filter

[Greg]

Hi Bjorn,

The 6 kHz filter "is" required for AM Transmit.  The FM filter will not
work.

The FM filter will work on RX, but will not be as good with image rejection
as the 6 kHz filter.

I would suggest starting with just the 6 kHz filter.  Then if you feel like
you want/need the FM filter for AM receive, go for it.

73
Greg
AB7R


-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net]On Behalf Of Björn Mohr
Sent: Sunday, February 17, 2008 3:17 AM
To: elecraft at mailman.qth.net
Subject: [Elecraft] K3 AM vs FM filter


Hi gang,

As I understand it the FM filter would be best for AM BC with its wider
bandwidth. Not perfect, but certainly better than the "AM filter" that I
guess is aimed towards voice AM communications.

Has anyone tested the FM filter for AM broadcast reception? If so, what is
your comments and advice? Is it suitable for this purpose, or are there a
better solutions out there.

Regarding AM voice operation, I do one AM contest per year. I guess it would
be possible to use the FM filter also for AM TX and restrict the bandwidth
on a DSP/audio level, or is this a bad idea?


73 de Björn /SM0MDG




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