[TenTec] INRAD First IF Filters

[David Drake]

To all that have responded to my quest for knowledge regarding the INRAD 
filters:

I had some time on Friday PM to really get into a good A-B comparison 
with the first IF filters.  (Not much other time over the weekend since 
#1 son became a proud father of his first child early Sunday AM)

1) When filters were reversed, i.e., Stock TT 2.4 in main slot and INRAD 
in narrow, I noticed an increase in S meter sensitivity by about 1-2 s 
units when narrow button depressed.  What!!  Was the TT filter that 
lossey?  No, read on.
2)Decided to get the xyl's ears to help in doing A/B test.  Had the rig 
on its side and started substituting both stock TT 2.4 and INRAD 2.8 in 
the main slot and noting the S-meter and audio quality.  Well, after 
several swaps, (and pins were self-cleaned a little........??!!!....Ah 
Hah!) I can say 3 things.  one, rig is quieter with the INRAD; two, 
receive audio is more pleasant, but not by much and three, S-meter reads 
about 1 S-unit better with the INRAD in the main slot.  It would appear 
it is a more efficient/effective filter.
3) Now for the narrow position.  I remembered another list member who 
commented that his radio came alive when he deoxited and cleaned a 
number of contacts on various boards.  I noticed that when the TT 2.4 
was inserted and re-inserted several times and the narrow button was 
depressed, it started working better(i.e., improved S-meter readings in 
narrow, or, just starting to work as it should).  I then got the deoxit 
dropper out and commenced cleaning contacts.  (That was my problem in 
the first place!!)

I now can say without a doubt the INRAD 2.8 in the main first IF slot 
does in fact improve the receive audio, reduces noise and is more 
selective/sensitive in my TT OMNI V.  It is a KEEPER.  I also can 
strongly recommend to all that after a rig like these older TT's gets a 
little age on it, get out your deoxit dropper and clean all the 
contacts, especially the filters.

A few of you have suggested running the second IF wide open for 
additional improvement.  Well, I may try that later, but now I am 
thinking about ordering another INRAD 2.8 for the second IF to do the 
same kind of listening test.

Thanks to all for your comments and support.  I believe anyone out there 
with a corsair or corsair II should also consider these filters.  If I 
still had my corsair, I know what I would do!!

Best wishes to all,
David Drake, Wd9cmd