[RTTY] Guess I have been away longer than I thought. +the Signalink USB

[David G3YYD]

Thom

Bad idea to use a USB serial port to generate FSK the reason being that
Windows is not a real time operating system so there is substantial amount
of timing jitter such as it can and does cause errors at the decoding end of
the link.

Using radio based FSK is a bad idea with many radios as they generate a very
wide signal causing a lot of QRM on the adjacent channels. The K3 with
current firmware is an exception to this but they may now be others. See
http://www.frontiernet.net/~aflowers/k3rtty/k3rtty.html 

If you have to use FSK then as Chen W7AY says the TinyFSK is the way to go
as that has virtually no timing jitter. If you want to be friendly to your
adjacent frequency RTTY enthusiast the narrowest on air signal then Fldigi
AFSK or 2Tone DOOK is the way to go.

73 David G3YYD

-----Original Message-----
From: RTTY [mailto:rtty-bounces at contesting.com] On Behalf Of Thom Durfee
Sent: 30 September 2016 17:09
To: rtty at contesting.com
Subject: Re: [RTTY] Guess I have been away longer than I thought. +the
Signalink USB

Tigertronics makes the Signalink USB and their documentation states their
interface does not support true FSK keying otherwise I would use it.

I may experiment sometime with a direct FSK keying using a USB port if I can
figure out how to do that.  I am so used to having serial com ports but I
have not owned a computer that has them for many years.  USB still baffles
me somewhat.

Thanks for all the comments.

Got my antenna mast up between the rain drops.

73

Thom Ki8W


On 9/30/2016 12:31 PM, Kok Chen wrote:
>> On Sep 30, 2016, at 8:20 AM, Joe Subich, W4TV <lists at subich.com> wrote:
>>
>>
>> The TS-480 has an RTTY mode but it is FSK and the Signalink does not 
>> support FSK generation (it's an expensive cheap sound card).
> The SignaLink is more than just a sound card -- it is one of the few
interfaces that has a built-in VOX-based PTT,  something that is missing in
interfaces many times even more expensive.
>
> For folks with older rigs that don't support VOX in digital modes, it is a
convenient way to get plug-and-play operation.
>
> 73
> Chen, W7AY
>
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> RTTY at contesting.com
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