[RTTY] INRAD filter question

[Joe Subich, W4TV]

 >  Prior to this I have been able to do AFSK RTTY lots of DX, some
 > contests, and some fun ragchews on RTTY........so the system works
 > (MMTTY into a SignaLink USB)

This indicates you are probably using AFSK in USB.  The narrow filters
are aligned for RTTY (FSK) mode which is in LSB using "high tones" -
2125 Hz Mark, 2295 Hz Space (TS-450/690 Instruction Manual, pg. 35).
You may be able to use the narrow filters with AFSK if you use the
2125/2295 Hz tone pair in LSB but I don't have access to a TS-450 to
confirm that.

73,

    ... Joe, W4TV


On 9/25/2010 8:40 PM, David VE3VID wrote:
>
> Last spring I got some good info and help from RTTY hams here about
> loading a set of INRAD filters into my Kenwood TS-450s.   I chose 2 x
> 400hz filters for the 8.83 and 455 IF stages.  The units went into
> the radio slick, and the Kenwood menu options to activate the new
> filters went without incident.  (INRAD No.s 103&  104)  Prior to this
> I have been able to do AFSK RTTY lots of DX, some contests, and some
> fun ragchews on RTTY........so the system works (MMTTY into a
> SignaLink USB)
>
>
>
> I am trying out the filters for the first time this weekend during
> the CQWW RTTY contest.  I have a problem.  If I click both filters on
> and tune across the band I hear nothing.  If I leave my IF stages
> wide and tune a RTTY station, as soon as I click in either of the new
> filters the RTTY station is gone and my S-meter drops way down.  Its
> like an attenuator was suddenly clicked in, sometimes my meter goes
> to S-zero, the volume out of the radio drops significantly and
> MMTTY's tuning indicators go blank.
>
>
>
> What am I missing,  what did I forget............??  Must be
> something, these are popular filters.  Any help
> appreciated.............
>
>
>
> David
>
>
>
>
>
> VE3VID          Located in rural Canada Solar power.  Wood heat.
> Mosley tribander @ 22m 2element delta-quad on 40m Lots of space for
> dipoles, bears and wolves......73
>
> http://www.ve3vid.webs.com/
>
>
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