Re: {Collins} Crystal or ceramic replacements for mechanical filters


For the S-Line, International Radio (InRad) carries drop-in replacements for
Collins Plug-in Filters using new Collins Mechanical Filters.  I believe the
narrow CW Filters (like Collins) are probably Crystal Filters as well.  

I've used their Roofing Filters with good results, but obviously the new
Collins Filters should be just fine as InRad simply built a PCB that mounts
the new filter with pins for plug-in.  Since the AM filters and narrow CW
filters are hard to come by these days, I expect I'll use them in the 75S-3B
one day.

I suspect they have appropriate filters for the non-plug-in filters, but
check out their web site at 

73 Dave WI6R

-----Original Message-----
From: Richard Knoppow [mailto:dickburk@xxxxxxxxxxxxx] 
Sent: Saturday, January 21, 2012 11:35 AM
To: collins@xxxxxxxxxxxxx
Subject: {Collins} Crystal or ceramic replacements for mechanical filters

     There seem to be a number of companies making crystal 
or ceramic lattice filters. Some of these might be 
replacements for Collins mechanical filters, perhaps with 
better characteristics (skirt steepness or lower ripple, 
etc). Has anyone had experience with any of these? Are there 
any that are recommended?  If so what is the cost relative 
to the genuine article?  I have no immediate need for these 
but a recent question made me think of it.

Richard Knoppow
Los Angeles


 NETS: Tues & Thur: 3.805 MHz-2000 Central + Fri: 3.895 MHz-2000 Pacific
  SUNDAYS: 14.263 MHz-2000 UTC  +  AM Net: 29.050 MHz-1200 Central
  1st Wednesday AM Net 3.880 MHz-2000 local (ET, CT, MT, PT)

The Collins Reflector reserves the right to refuse access to anyone.

LIST HELP?  ADMIN EMAIL:  collins-owner@xxxxxxxxxxxxx
This ONLY goes to the list admins and does not post to the group!

This archive was generated by a fusion of Pipermail (Mailman edition) and MHonArc.