[RTTY] FSK Readouts vs AFSK

[Jerry Flanders]

Just a FIY: Flex radios allow easy adjustment of the tx bandpass. I 
routinely use a narrow tx bandpass with AFSK just to avoid problems 
such as Joe describes below. It is a click/drag adjustment, with 
visual feedback on the bandpass adjustments.

Jerry W4UK

At 05:03 PM 2/6/2012, Joe Subich, W4TV wrote:

>  > Someone sent me this comment when the subject of FSK readouts came up.
>  > Any thoughts on his plan?
>
>The only problem with using 915/1015 (1 KHz) or any other "low" audio
>tones with AFSK is the chance that over driving the microphone input
>of the transceiver will produce harmonics that will get transmitted.
>The problem is particularly a problem with tones 1 KHz and below since
>the 3 KHz harmonic content *will* make it through the IF filter in most
>rigs.  3 KHz is right on the "knee" of the response of most modern
>rigs.
>
>73,
>
>     ... Joe, W4TV