[Elecraft] K3 filters

[Vic K2VCO]

Scott McDowell wrote:
> I have a k3/100 ordered and am trying to decide on filters. I would
> like the 250 hz 8 pole filter for cw. Should I also get the 400 hz
> filter for ssb.

It's important to remember that the selectivity is dependent on the DSP 
setting and the filter is just a backup for very strong nearby signals. 
For CW the 400 or 500 Hz. filter will be fine; you can adjust the 
bandwidth down to 50 Hz. with the DSP controls.

The 250 Hz. filter is probably narrower than you will need for CW 99% of 
the time. It is useful for RTTY or PSK, however.

For SSB the stock 2.7 kHz. filter will do a good job. Some contesters 
like the 1.8 kHz. filter so they can operate closer to very strong 
signals. 400 Hz. would be way too narrow for SSB.

So if you are a CW/SSB operator I would recommend the 2.7 kHz. filter 
(for ssb) plus the 500 or 400 Hz. filter (for CW). If you are especially 
interested in digital modes, then maybe the 250 could be useful -- but 
it isn't necessary.
-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco