[aprssig] DV on analog repeaters
ik7565 at verizon.net
Sun Jul 6 11:11:43 CDT 2008
I couldn't make it work. A friend and I tried using DV on our analog
repeater to no avail.
73, Ian N8IK
From: aprssig-bounces at lists.tapr.org [mailto:aprssig-bounces at lists.tapr.org]
On Behalf Of Mark Miller
Sent: Sunday, July 06, 2008 7:09 AM
To: TAPR APRS Mailing List; TAPR APRS Mailing List
Subject: Re: [aprssig] PIC processor for APRS info for D-STAR mobiles?
At 09:28 PM 7/5/2008, Wes Johnston, AI4PX wrote:
>Yes, I got a partial answer. So does the low speed GMSK data
>transit a voice grade repeater? I know that afsk 1200baud packet
>will. Will the 4800baud digital voice signal do the same?
It is possible for a GMSK signal to pass though a voice grade
repeater. I have tried this with MICOR, MSF5000 and Quantar type
repeaters. I am not sure if the GMSK was passed error free, but the
error correction (for voice) built into the AMBE2000 codec seemed to
handle any errors that were induced. The part of the signal that
seems to be degraded is in the low frequency spectra of the GMSK
signal. I have recorded GMSK using an ID=800 and an M-Audio Delta 44
soundcard, and have played the signal back through the signal
generator in an HP8920A The results were similar to the repeater
tests mentioned above.
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