Peter
As far as I know they just use a USB to COM port adapter probably a chip
from FTDI. But why spend money on a box when you can just use AFSK for a
very small sum in making your own sound card to rig lead. You need such a
lead anyway for PSK, FT8, etc. The timing from audio is set by the crystal
on the sound card and will have no timing jitter.
73 David G3YYD
-----Original Message-----
From: RTTY [mailto:rtty-bounces@contesting.com] On Behalf Of Peter Laws
Sent: 26 October 2017 19:06
To: RTTY contest group
Subject: Re: [RTTY] Intel NUC, anyone?
On Thu, Oct 26, 2017 at 4:20 AM, David G3YYD <g3yyd@btinternet.com> wrote:
> Using EXTFSK(64) or for that matter 2Tone FSK using bit diddling of a
> COM port control line is one way of making sure you get extra errors
> on the far ends decode and being asked to repeat.
No RS-232 headers, either, in a NUC, which I was secretly hoping for.
I did also look at the jitter info Oba-san has on his site referring to
EXTFSK64. So USB -> RS-232 -> FSK radio port isn't the best way to do this
(even though it's done all the time).
So my next question is, how to the commercial USB interfaces that support
FSK actually do it? Are they skipping the RS-232 part and just wiggling (at
45.45 bauds) some wire that connects to the radio's FSK port?
--
Peter Laws | N5UWY | plaws plaws net | Travel by Train!
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