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@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 AGWPE 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
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb