[RTTY] Kenwood IF filters ???

[K9OR]

David,

While I'm not as hard-core a RTTY'er as most are on this reflector, I have
had every permutation of Kenwood and Inrad filters in several 850's.

I prefer 400hz Inrad's cascaded for both CW and RTTY.
Or a 250 in first if, 400 in 2nd if. 
Pick & choose, or both, depending on conditions for both combos.
Cascading equal width filters makes the 850 slope-tune control symmetrical,
if that's important to you.

I have tried 250's in both if's, just a bit too narrow and lossy for me.
I don't have good enough antennas to be constantly bombarded by S9+40
signals (wish that I did), but I appreciate the arguments for dual 250hz
filters - and roofing filters - for those dealing with lots of close-in Big
Guns.

While I am a fan of Inrad filters, because I prefer the 400hz bandwidth, the
Kenwood filters I've had are pretty good and a pair of KW 500's or a
250/500hz combo might work OK for you unless a fellow RTTY contester lives
next door.

73 Randy K9OR


> -----Original Message-----
> From: rtty-bounces at contesting.com
> [mailto:rtty-bounces at contesting.com] On Behalf Of David VE3VID
> Sent: Thursday, February 18, 2010 4:30 PM


> Show of hands please from users with TS-850s & TS-450s - 2 x
> 400hz filters for both IF stages, or 2 x 250hz filters in
> both.  Is my logic correct?  RTTY signals are "supposed" to
> be 170hz wide, so a 250hz filter would be
> optimal......yes/no.......(circle one hihi)