[RTTY] Product Review: Computer Sound Cards for Amateur Radio

[John Parker]

Is there anyone one this list who uses a Teletype and is in need to a
testing unit?  I used to have three Model 28's and sold them.  I just found
my Teletype Corp. Testing unit.  It's FS if anyone needs one.

$40.00 + Shipping from 98072

-73 John KD7KFT




-----Original Message-----
From: rtty-bounces at contesting.com [mailto:rtty-bounces at contesting.com] On
Behalf Of Vladimir Sidorov
Sent: Tuesday, April 24, 2007 3:17 PM
To: rtty at contesting.com
Subject: Re: [RTTY] Product Review: Computer Sound Cards for Amateur Radio

This article turned to be of great interest to me, too, when I first found 
it in the the magazine. I hoped to find an answer to a question which is up 
for me for quite some time. My actual shack PC is the Toshiba SatellitePro 
laptop PIII/850 MHz. Although it's not quite an up-to-date machine, it is a 
perfectly built one and certainly outperforms the HP Pavillion Centrino 1.7 
GHz sitting next door in my home office. The matter is, when I run MMTTY, 
the program simply freezes every hour or so in the end of  transmission and 
I have to re-start it. In fact, it costed me quite some contacts. Another 
thing is, if I play with PSK (quite seldom, this mode is not for me really),

from time to time it also falls off ("This program performed...", and so 
on). My suggestion was, the built-in soundcard is too weak for digimodes. 
So, when I saw the article, I suggested to find a proof to my suggestion and

some solutions how to fight my problems. Actually I have found nothing... 
The way I read it, everything should be just fine. It is not.
Actually the article brought me more confusion that useful information.

73,
Vladimir VE3IAE

---



> There is a product review in May 2007 QST, "Computer Sound Cards for 
> Amateur
> Radio".  ARRL members can read the article at:
>
>    http://www.arrl.org/members-only/prodrev/pdf/pr0705.pdf
>
> Bottom Line
>
> "There are clear performance differences between inexpensive 16-bit sound 
> cards
> and the more expensive 24-bit models. For most digital mode users, any of 
> these
> cards will perform well. Software defined radios and other 
> high-performance
> applications will benefit from a high-end card."
>
> Conclusions
>
> "Most Amateur Radio sound card applications should work perfectly well 
> with the
> lower-end models. The 24-bit devices do have better specs, but very few
> digital-mode apps are designed to take advantage of the higher precision. 
> On
> the other hand, critical applications such as software-defined radios can
> definitely benefit from the superior noise, dynamic range, and distortion
> characteristics of the high-performance cards."
>
> If you can, I suggest you read the section, "A Real-World Test".
>
> 73 - Jim AD1C
>
>
> --
> Jim Reisert AD1C, 7 Charlemont Court, North Chelmsford, MA 01863
> USA +978-251-9933, <jjreisert at alum.mit.edu>, http://www.ad1c.us
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> 

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