[Elecraft] Proper K3 filter/options selection?

[Joe Subich, W4TV]

I agree with Jim that you are over ordering the filters.

That said, I would stick with the stock 2.7 KHz in both main and sub
RX.  Quite simply, there isn't enough difference in selectivity or
IMD performance to justify the cost of the change.

Add the 1.8 KHz for "narrow SSB" in the Main RX (you certainly don't
need both 2.1 KHz and 1.8 KHz).  I would also go with either the 
Elecraft 500 Hz or INRAD 400 HZ CW filter in both receivers (400 Hz
to be wide enough for RTTY) and add the 200 Hz for "narrow" CW.

There simply is not enough difference between the 500/400 Hz filters
and the 250 Hz (340 - 370 Hz nominal) to justify both 400 and 250 in
the same receiver.

I also recommend the KXV-3 for support of separate receive antennas
and the IF output.

73,

    ... Joe, W4TV


On 8/15/2011 1:11 PM, Jim Brown wrote:
> On 8/15/2011 9:33 AM, paule408 at yahoo.com wrote:
>> Can you experts check this configuration and tell me if it will be ideal for CW/SSB/RTTY?
>
> You're ordering more filters than you need.  I would go with 2.8 kHz,
> 1.8kHz and 250 Hz in the main RX, 2.7 kHz and 250 Hz in the second RX.
> You're only likely to use diversity with CW on the lower bands. The
> 2.8kHz filter is flatter in the passband, so reduces incidental AM with
> RTTY, which might help in a multi-station environment.
>
> And unless you're a total mechanical clutz or too busy to build, I
> strongly recommend buying the kit. It's screw-together, takes about 10
> hours with one RX, another 2-3 hrs for 2nd RX.  Big cost savings, all
> the modules are pre-tested, and you'll know how to pull it apart to work
> on it or trade modules when things go wrong.
>
> 73, Jim K9YC
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