> The TS-450 has a +/-2.2Khz IF shift. This may not be quite enough to
> get the RTTY signal inside the passband. The 450 also has a menu
> option to change the receiver tone from 2125 to 1275hz. This may be
> irrelevant though as it is for FSK mode.
If the narrow filter is centered at 600 Hz in LSB, a 2.2 KHz offset
should get you to 2800 Hz which should be more than enough. Check
it though.
> PLAN-B if this fails, is there a simple& inexpensive interface
> that I can use to do true FSK. USB to 13pin DIN...........??
See the information on AA5AU's web page:
http://www.aa5au.com/rtty.html.
You will need a pair of NPN transistors driven from the RTS/DTR
lines of a typical USB to serial converter with EXTFSK to generate
the FSK/PTT signal. You can continue to use the Signalink USB for
PSK31/other digital modes and for receiving RTTY.
73,
... Joe, W4TV
On 9/26/2010 11:11 AM, David VE3VID wrote:
>
> Confusion is clearing a bit, check my thinking on
> this.................. The 400hz filters are listening over a
> portion of the band away from the section where the mark and space
> tones will be heard. So the reason it sounds so beautifully quiet is
> because I'm listening to the null outside the filters bandpass.
> Yes?
>
> The TS-450 has a +/-2.2Khz IF shift. This may not be quite enough to
> get the RTTY signal inside the passband. The 450 also has a menu
> option to change the receiver tone from 2125 to 1275hz. This may be
> irrelevant though as it is for FSK mode.
>
>
>
> I'll be back in the op chair this afternoon and give these options a
> try then get back to the email thread. PLAN-B if this fails, is
> there a simple& inexpensive interface that I can use to do true FSK.
> USB to 13pin DIN...........??
>
>
>
> David
>
>
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