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Re: HT Satellite Ground stations.



Bob,

Could you share the procedure to switch the control port between the radio
and the TNC?

Thanks

Daniel Lavoie
VE3DCL
----- Original Message -----
From: "Bob Bruninga" <bruninga@nadn.navy.mil>
To: "TAPR APRS Special Interest Group" <aprssig@tapr.org>;
<htaprs@tapr.org>; <amsat-bb@AMSAT.Org>
Sent: Thursday, February 03, 2000 11:51 AM
Subject: [amsat-bb] HT Satellite Ground stations.


> Kenwood digital radio/TNC remote control,
>
> Tonight, I discovered how to switch the control port between the
> radio and the internal TNC so that my APRStk program can now both
> auto-tune the doppler and route the downlinked packets DURING the pass
> through the radio's single serial port.  Thus, PACSAT Receive-only
> stations can be assembled with nothing but a PC and the Kenwood HT on a
> 20 inch whip antenna.
>
> I have been using a 3/4 wave vertical (20.2") on my THD7 and can receive
> the downlink from any of the (working) pacsats  while they are above 20
> deg...(the antenna has over 7 dBi gain up at 40 deg or so on 435) and
> still works as a 1/4 wave whip at 2m too.).
>
> So, next version of APRStk will be able to tune the radio to the right
> satellite and tune for doppler.  Then just hooking the output to a TELNET
> port can combine/share the downlink with other similar stations and the
> world.
>
> Then all we need is 5 more such sites and we have the whole USA covered.
> Every packet from the satellite gets collected... and shared via the
> TELNET links between the sites...
>
> To see what we can do with this for a mobile amateur radio:
>
>   http://web.usna.navy.mil/~bruninga/astars.html
>
> de WB4APR, Bob
>
> Yes, this works well in your car.  But if you put 50 feet of coax between
> the antenna and the HT in your shack, then you just lost 3 dB and should
> add a preamp...(at the antenna).
>
> ----
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>
>
>

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