[amsat-bb] ISS Packet Frequency?

Norm n3ykf normanlizeth at gmail.com
Thu Apr 27 11:40:03 UTC 2017

Stupid question time: Do you have the sound card and audio processing
sample rates set the same (identical)?

Norm n3ykf

On Wed, Apr 26, 2017 at 5:51 PM, Stewart Todd Morgan
<morgan_st at bellsouth.net> wrote:
> Since I have been using both a Kenwood TH-D72A and other less-than-optimal
> gear for packet and APRS over the last several years, I decided to do a
> side-by-side packet decoding test this afternoon during a 38 degree ISS pass
> at 2048 UTC.  Both ground stations were connected via a splitter to the same
> antenna (an old analog TV antenna at 0 degree elevation and covering all 360
> degrees azimuth).  Both ground stations also shared the same Pentium
> dual-core laptop computer for software.
> The less-than-optimal station included the following:
> Icom IC-02AT HT
> Unified Microsystems SCI-6 Sound Card Interface
> UI-View32
> The Kenwood TH-D72A was in packet mode and decoding through the latest
> version of Yet Another APRS Client (YAAC).
> Both stations were tested prior to the pass on terrestrial APRS with almost
> identical decoding results.  Tuning during the pass was done in 5 kHz
> increments on both stations (145.830 MHz, 145.825 MHz, 145.820 MHz).
> Reception during the ISS pass was less than stellar due to local noise, but
> both stations decoded the same number of packets (13), although they didn't
> always decode the exact same packets.
> So even with the non-linear frequency shift noted previously by K4KDR and
> myself, there does not seem to be any appreciable difference between my ISS
> packet decoding ability now and any point in the past, even with non-packet
> hardware.  Perhaps a couple of other stations could share their experience
> in this regard.
> Todd
> AL0I
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