Are you using FSK or AFSK? For AFSK, using high tones (2125/2295)
places the tones such that any harmonics are eliminated by the
transmitter IF filter. With low tones, harmonics caused by over-
driving the microphone circuits are within the transmit audio
passband and will be transmitted along with the desired tones.
Many of the older transceivers were also limited to high tones
for narrow filters to work on receive.
73,
... Joe, W4TV
> -----Original Message-----
> From: rtty-bounces@contesting.com
> [mailto:rtty-bounces@contesting.com] On Behalf Of wb5tuf@earthlink.net
> Sent: Monday, March 01, 2010 2:53 PM
> To: rtty@contesting.com
> Subject: [RTTY] Low Tones
>
>
> Other that operator preference, is there any advantage to
> using high or low tones?
>
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