Since I operate very little on HF, then why did I buy the 8-pole filters?
Because:
1. I figured they had steeper skirts for extreme operating
conditions where adjacent strong signals were encountered. (very
rarely happens in my neighborhood though a multi- super contesting
station lies 10mi north of me). But someday I may be operating
portable/mobile in the lower-48 where it will be appreciated.
2. I bought the KRX3 sub-receiver; matched filters were recommended.
3. I figured it would help re-sale value, someday.
I bought:
13-KHz for FM (on VHF)
2.8-KHz (K3 required either 5 or 8-pole SSB filter)
400-Hz CW
2.8-KHz for KRX3.
I wrongly bought an extra 13-KHz filter for the KRX3, not thinking
clearly that the KRX3 would not be used for FM - I sold it here on
the reflector after realizing my error.
In practise I mostly use the 2.8-KHz roofing filter and set bw with
the DSP, even on CW, which is mainly used for VHF or eme. The 400-Hz
filter does appear to improve the sensitivity when running 200-Hz on
CW-eme. Probably knocks down the noise bw of the receiver before the
A/D converters.
I avoid the HF contests and only participate in the Elecraft
Net. Occasional psk-31 on 14.070, and very occasional general
chatting on (mostly 20m). 99% activity is eme oriented which is 90%
building/fixing and 10% operating. QRV on 17-bands 600m/3cm.
73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
dubus...@gmail.com
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