AFSK sends diddles , as in MIXW. Nice sounding? well..................
JOhn
VE5MU
----- Original Message -----
From: Andrew O'Brien
To: digitalradio@yahoogroups.com
Sent: Sunday, February 25, 2007 10:19 AM
Subject: Re: [digitalradio] That pesky FSK RTTY
Thanks Danny and Rick. So, before sound cards, I used an old fashioned TNC
and a rig that would only do AFSK not FSK. How did that work ? One thing I
did not like about the TNC days was that when sending RTTY it did not generate
any of that nice sounding RTTY diddles. Will that now be the case again, when
I start using FSK ? I like soome tines when i am transmitting, not silence.
Andy.
On 2/25/07, KV9U <[EMAIL PROTECTED]> wrote:
In the "old days" the VFO was shifted by mechanically switching a
smaller capacitor in and out across the VFO tuning capacitor. This is
probably why mark high was the standard, since adding capacitance would
pull the frequency lower for the space tone.
Today we are mostly using synthesized VFO's, and apparently all that
most rigs do is insert the tones internally instead of you having to do
this with outside tones from a sound card or other interface device. The
advantage is that you do not have to adjust anything, assuming the
internal tones are set correctly.
73,
Rick, KV9U
Andrew O'Brien wrote:
>OK, I think I get it but..
>
>
>
>> With FSK, there is no setting up of the drive levels from the sound card
>> since you are basically switching the frequencies from inside the rig.
>>
>>
>>
>
>
>tell me more about the above. How does the switching of frequencies
>generate tones heard at the other end.
>
>
>
>
--
Andy K3UK
Skype Me : callto://andyobrien73
www.obriensweb.com
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