[amsat-bb] Re: ISS 9K6 with ICOM 910
ka3hsw at att.net
Sat Dec 13 08:04:30 PST 2008
A plain mobile FM rig probably will NOT work for 9k6... you need
unprocessed (no de-emphasis) discriminator output to your sound card for
receive, and direct (no pre-emphasis) FM modulation for TX. Any
pre-emphasis/de-emphasis cuts off the high audio frequencies necessary for
9k6, as will the hysteresis of any isolation transformers in your interface.
The 910H, and any other "9600-ready" rig with a data jack that provides
those 2 connections directly to your soundcard, will work.
----- Original Message -----
From: "Curt Nixon" <cptcurt at flash.net>
To: "Alan" <ve4yz at mts.net>
Cc: "'AMSAT-BB'" <amsat-bb at amsat.org>
Sent: Friday, December 12, 2008 8:07 PM
Subject: [amsat-bb] Re: ISS 9K6 with ICOM 910
> Hi Alan:
> Yep..I do alot of digital site recording of classical music using
> off-board A/D boxes. I can tell you that, even great laptops have
> really BAD sound handling ability. The stock AC97 system can be very
> noisy and I'm sure that would play havoc with 9K6. An option for
> getting the sound card to work is to let 2 computers talk to one another
> via their sound cards. I did this early on learning the 1200 baud
> system and it at least verifies most of the system without using up
> prime "pass" time.
> You at least have the data ports on your radio--mine are just plain old
> mobil FM rigs so they might never work.
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