[1000mp] SUB RECEIVER FILTER WANTED

[Joe Subich, K4IK]

> Should i be looking for a YF-115c filter.?
> and if so can someone share with me if its really worth the 
> time and money.

I would not use the Yaesu (or INRAD) 500 Hz Collins 
filter.  While it is better than the ceramic SSB filter, 
it is much too sloppy - nearly 600 Hz with a shape factor 
of 2.6:1. 
 
> As at present the lack of filter in the sub receiver leaves 
> it as wide as a barn door

My preference would be the INRAD 721-C a 500 Hz crystal 
filter with a shape factor about 1.7:1.  Some folks are 
using the INRAD 703-C 400 Hz crystal filter but I think 
it's a bit narrow for the subreceiver. 

73, 

   ... Joe, K4IK