[Elecraft] K2 Roofing Filter?

[N2TK, Tony]

Don,
Wasn't there talk a while back about someone replacing the Noise Blanker
with another crystal filter? If it was switchable, like switching in and out
the Noise Blanker,  would that add to the shape of the skirts in the present
crystal filter? Not sure about making up for any loss in the added filter
though. Maybe set up this added filter for CW (400-600HZ) ?

I still haul the K2 down to WP2Z.
73,
N2TK, Tony

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net]On Behalf Of Don Wilhelm
Sent: Wednesday, November 08, 2006 10:15 AM
To: Joe-aa4nn; elecraft at mailman.qth.net
Subject: RE: [Elecraft] K2 Roofing Filter?

Joe,

To generalize - 'roofing filter' would be placed right after the first mixer
for best effectiveness to strip off extraneous mixing products.

The K2 is a single conversion design and the IF filter is placed right after
the first mixer (there is a post-mixer amp there for good dynamic range) -
so it serves both as the IF filter and the 'roofing filter'.

In other words, yes a roofing filter 'does not compute' for a single
conversion design.

73,
Don W3FPR

> -----Original Message-----
>
> In view of this, and excuse me for not being an engineer in
> receiver design,
> why is there not a roofing filter option for the K2.  Is it just not
> possible in
> a single conversion rig?
> de Joe, aa4nn
>

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