Note:
When the VHF-1 transmitter is Running, the Amateur Radio receivers in the
2-meter band will go deaf (Receiving on 145, 490, 145.200, 145.990).
This is because the Transmitting antenna for VHF-1 is less than 50 feet away
from the Amateur Radio antennas.
The VHF-1 transmitter is usually left running for a few hours at a time for
ground stations to test against. If you wish to test this theory, just try to
ping the Amateur radio packet station ISS during a VHF-1 transmitter test.
When VHF-1 is transmitting, you will not see any packet activity, other than
internally generated Beacons on 145.800 (down 145.800, uplink 145.990). When
VHF-1 shuts down, normal packet access will resume.
Marex discovered this problem with the Mir Amateur Radio station. We then
custom designed a filter by DCI, to resolve the issues. No such filter exists
on ISS.
http://www.marexmg.org/documents/DCIFilterProject1.doc
WF1F, www.marexmg.org
--- On Wed, 7/14/10, Bob Christy <[email protected]> wrote:
> From: Bob Christy <[email protected]>
> Subject: [amsat-bb] ISS - Mission Control Comm Check
> To: [email protected]
> Date: Wednesday, July 14, 2010, 4:47 AM
> Today's ISS crew schedule shows VHF
> comm checks from the Russian segment while over North
> America. Ground stations are at White Sands and Wallops.
>
> The pass is from 20:00 UTC (west coast) to 20:15 UTC (east
> coast).
>
> VHF-1 is 143.625 MHz FM, there may also be something on
> VHF-2 at 130.167 MHz.
>
> Bob Christy
> _______________________________________________
> Sent via [email protected].
> Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur
> satellite program!
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>
_______________________________________________
Sent via [email protected]. Opinions expressed are those of the author.
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