[RTTY] Novice question, re TS-850 filtering & FSK

[John L Merrill]

As I recall you have to adjust the slope tuning to bring in the tones.

John N1JM



On Sep 10, 2011, at 5:11 PM, wyc wrote:

>> From AA5AU's page http://www.aa5au.com/rtty_radios.html#TS-850 I see several
> people have used a narrow (250 or 270 Hz)  CW filter on RTTY.  (I understand
> there are drawbacks in hearing off-frequency signals...)
> 
> I can't seem to get it to work.  (I've got a Kenwood YG-455CN1 250 hz filter
> installed in the 455 Khz IF).  When I switch that filter in, the noise
> spectrum drops way down for the right-most marker in the MMTTY UI.  (I can
> send screen shots if it'd help.)
> 
> I've tried both high tones and low tones, with the same result.
> 
> I'm using the rig's true FSK - not AFSK.
> 
> I wonder if I'm missing something - why are the RTTY tones not equally
> spaced within the filter passband?
> 
> (I've also got a 400 Hz filter.  It's broad enough to pass both tones.  But
> for it, too, the tones don't seem to be centered in the passband.
> 
> Any help would be welcome.
> 
> tnx/73,
> 
> Bill, K2PO
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