[TenTec] Next filter?

[ditzian@alltel.net]

I have followed the thread about narrow filters with interest, but I 
note that no one has mentioned using very narrow filters on 
PSK31.  The theoretical bandwidth of this slow mode is 50 Hz., 
and I do not know if the ringing would bother PSK decoding.  I 
would love to try 100 Hz. filters in my Omni VI, or even the 250 Hz. 
filters, except I am too cheap to purchase them.  I expect that the 
effectiveness of this combination will be evaluated by someone 
using IF DSP, when a manufacturer finally includes extremely 
narrow filters.

There is the question of whether there is a meaningful increase in 
S/N using extremely narrow filters.  Of course, there may be a 
problem with drift and losing the other guy, unless both stations are 
using extremely stable VFOs, and I do not know if the Omni VI 
would suffice here.


73,
Jan Ditzian
KX2A
kx2a@arrl.net