[RTTY] Dealing with High-Pitched Background Noise?

[Jeff Stai]

Using lower tone freqs like Bill suggests is one answer, but I usually just
turn down the volume to just the threshold where I can hear to tune. That
may sound flip but I used to keep the volume a lot higher than I needed to.
Once I started experimenting with how low I could go with it I found I
could use a lot lower volume than I thought after some practice. You may
also find after lowering the tone freqs lets you choose a lower volume than
at a higher freq.

One caveat is that the reason 2125/2295 became a "standard" is that any
mixing artifacts are outside the passband of a typical SSB transmitter.
When you go lower those artifacts start to come into the passband.
Something to check on.

Have fun! jeff wk6i



On Fri, Jul 25, 2014 at 10:11 AM, Bill Turner <dezrat at outlook.com> wrote:

> ORIGINAL MESSAGE:          (may be snipped)
>
> > However, I noticed an annoying disadvantage when I did this.  With the
> > narrow filter engaged, the background noise becomes much higher in pitch,
> > to the point that I find it quite uncomfortable to listen to.
>
> REPLY:
>
> Perfectly normal. The default tones for RTTY in most transceivers and
> software are 2125 and 2295 Hz. When you narrow down the receiver's filters,
> the white noise falls into that range and that's what you are hearing -
> high pitched white noise.
>
> One alternative is to use lower frequencies if your transceiver and RTTY
> software support them. Many hams use tones in the range of just above 1 kHz
> which may be easier to listen to over a long period of time.
>
> Consult your owner's manual to see if it possible with your present rig.
>
> 73, Bill W6WRT
>
>
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-- 
Jeff Stai ~ wk6i.jeff at gmail.com
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