[aprssig] EB-432/PCSAT2/APRS Question

[hasan schiers]

Are you adjusting for doppler, or are you just letting it sit unattended?

I get quite a few more decoded packets than you are indicating with my D700 
in the house sitting on 435.280 with a dual band j-pole at 60' with 110' of 
LMR-400 and no preamp. I do not do doppler correction, so I deliberately set 
the vfo 5 khz high to catch the early part of a pass. If you set it dead 
center, that is the fastest point of relative motion for an overhead pass, 
and the signal won't be in the passband very long. If you choose a lower 
pass  the doppler rate is lower, so if you pick the freq judiciously, you 
can maximize the number of possible packets in the passband, BUT you have to 
set the VFO freq higher due to doppler (in the early part of a pass).

73,

...hasan, N0AN
----- Original Message ----- 
From: "John Ronan" <jronan at tssg.org>
To: "Robert Bruninga" <bruninga at usna.edu>
Cc: <aprssig at lists.tapr.org>
Sent: Friday, May 26, 2006 9:01 AM
Subject: Re: [aprssig] EB-432/PCSAT2/APRS Question


> Afternoon,
>
> I changed the radio modem to a hardware 9600 baud modem last night. 
> Results
>
> Orbit 42970, max elevation 14deg
> Position AZ
> AOS 204
> MAX 167
> LOS 82
>
> No decoded packets
>
> Orbit 42917, max elevation 48 deg
> Position AZ
> AOS 243
> MAX 144
> LOS 80
>
> No Decoded packets
>
> Orbit 42972, max elevation 82
>
> Position AZ
> AOS 269
> MAX 161
> LOS 93
>
> 1 Decoded packet (normal telemetry)
>
> Orbit 42973, max elevation 42
>
> Position AZ
> AOS 281
> MAX 183
> LOS 121
>
> 8 Decoded packets, 6 Telemetry, 2 normal telemetry
>
> Orbit 42794, max elevation 10
> Position AZ
> AOS 276
> MAX 194
> LOS 162
>
> 10 Decoded packets, 9 Telemetry, 1 normal telemetry
>
> Thats more Solar cell data than I've decoded in over a month. I can  only 
> assume that they made it into the APRS-IS system correctly.  I'm  not sure 
> why the 80 degree pass didn't result in more data.  I can  only surmise 
> that the other antenna that are on the chimney are  interfering/blocking 
> the signals to a northerly direction (a 5.8Ghz  wire Dish), which would be 
> consistent with the results.
>
> I'm also wondering whether the software modem had actually just  'hung'. 
> I never checked that before I swapped over to the hardware  modem.  I'll 
> swap back tonight and see how it works after being re- started.
>
> Regards
> de John
> EI7IG
>
> --
> John Ronan <jronan at tssg.org>, +353-51-302938
> Telecommunications Software &  Systems Group,  http://www.tssg.org
>
>
>
>
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