Re: [amsat-bb] RE: Future ECHO User Status burst?

[Emily Clarke <w0eec@xxxxxxxxx>]

I think the idea of something happening when the CTCSS drops is a good 
ideal.  However a 9600bps packet cannot be heard by anyone (at least not by 
anyone I know) so I would just recommend that there be a simple beep like 
an courtesy tone.  However if you wanted to proceed that beep with a 9600 
baud Mic-E compressed packet that would be OK.  But I feel that there needs 
to be some audible indication that the CTCSS dropped.   Also, if you send 
it before the beep there would be less of a chance that someone would step 
on it.

73,

Emily



At 01:08 PM 8/1/2004 +0800, you wrote:
>Hi All,
>
>A further variation:
>
>When the voice uplink receiver ceases decoding valid CTCSS, a 9600bps packet
>is transmitted on the voice downlink, that provides information on the
>received uplink signal characteristics, as per approx 500ms ago.
>
>Minimal received signal information would simply be the instantaneous RSSI
>(in dBm) as at 500ms ago.
>
>Ideally, an extended report could be issued, such as:
>
>    dur min/avg/max/var = 4.5s -122/-106/-97/12
>
>(The above report showing that valid CTCSS was detected for 4.5 seconds,
>during which the minimum RSSI was -122dBm (ie fade to no signal), average
>RSSI during the 4.5 seconds was -106dBm, and maximum RSSI was -97dBm.
>During this time, the statistical variance was 12.4 (or this could be send
>as the standard deviation, if square root is trivial on the IHU).
>
>This would make ECHO an incredible flying test platform;  amateurs could,
>for arguably the first time, directly quantify improvements to their
>transmitting setup;  the transmission of statistical variance measured
>throughout a transmission provides insights to the duration and depth of
>fades related to polarisation mismatch (whether geometrical or Faraday
>rotation induced) and nulls in antenna pattern.
>
>Free text could be appended to the RSSI status data (as per Bob's initial
>suggestion).
>
>
>Comments?
>
>
>
>73 Chris vk6kch
>
>
>
>p.s  The 500ms is to allow for the decay time of the CTCSS decoder;  make
>sure we're giving information about the actual uplink transmission, and not
>ambient noise after the RF has dropped, but CTCSS decode is still decaying.
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---------------------------------
W0EEC - CM87tm
AMSAT Area Coordinator - San Francisco Bay Area
http://www.projectoscar.net    http://www.PlanetEmily.com 
http://www.emilyshouse.com/experthams/ao7/

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