[RTTY] (no subject)

[Joe Subich, W4TV]

1) too many people do not know how to build and adjust a *clean* AFSK
    interface.  They overdrive the mic preamp in the rig and generate
    multiple "ghost" signals up/down the band.  They connect the AFSK
    interface to the same power supply as the rig and get RF feedback
    into the mic input.  They leave the SSB processor engaged and
    generate IMD (yes, even with RTTY) with broad/unstable signals.

2) too many rigs do not allow narrow IF filtering with AFSK (USB)
    which leaves the second IF, detector, AGC and sound card exposed
    to strong adjacent channel signals which causes all manner of
    degradation to the received signal.

73,

    ... Joe, W4TV



On 8/23/2011 12:46 PM, Gedking at aol.com wrote:
> Why is everybody hung up on FSK when The  AFSK signal  leaving  the Ant is
> the same and the  receiving end don't know the difference???
>
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