[RTTY] Bandwidth of a RTTY signal (was:SO2R RTTY Radio)

[Jay]

At 10:17 PM 8/28/01 +0200, Ekki wrote:
>> If possible, use a 250 Hz filter for RTTY.  500 Hz is ok for Pactor but
>> unnecessarily wide for RTTY.
>
>I beg to differ :-)

Well I beg to differ )!

I have used 250 Hz filters in my final IF for RTTY operation since 1985 or
so in contests. I have used them with Icom 751, Icom 761, Icom 765, Kenwood
850, Yaesu FT-1000, Icom 706, Kenwood 940, Kenwood 930, Yaesu 990.  All
stock manuf. filters.

All stock manufacturer filters at 250 Hz in no way, shape, or form actually
pass only 250 Hz you need to note that most are 250 Hz at 6 Db.  

Actually use what ever you like. But here's what others have said about
this subject:

Walter, DL4RCK - I am running a TS850SAT and it work very well with RTTY
with a 500Hz and 270Hz filter. 

Bruce, WT4I - Used on FSK, 250 and 500 Hz filters

Roy, N8YYS - Have 500 Hz and 250 Hz IF filters (INRAD).

Jan, SM5FUG - Filter:  270 Hz (in 8.83 MHz IF) and 500 Hz (in 455 kHz IF). 

Don, AA5AU - I use either the 500 hz or 250 hz filters.  

Hal, WA7EGA 250 Hz lets me operate in a crowded band.