Re: [amsat-bb] TS-2000 and PL

[Emily Clarke <w0eec@xxxxxxxxx>]

At 06:48 PM 8/1/2004 -0400, "Kenwood" Bob Bruninga wrote:
(apologies to VE7WFG - I had to use it.)

>Regarding no PL tone in Satellite Mode:
>
>I dont understand the fuss.   The advantage of "satellite"
>mode is for tracking of both bands while "tuning" across the
>multiple QSO's and frequencies in the downlink band of a
>linear SSB/CW satellite and for adjusting for Doppler.

I totally disagree with this.  It's ONE advantage, not THE advantage.  The 
other advantage is full doppler tuning on FM satellites.

>None of that has anything to do with operating via ECHO
>using mode J FM:
>
>1) An FM bird has no wideband tansponder
>2) An FM bird has only one frequency

Huh?  A simple FM satellite like SO-50 starts at one frequency but when 
receiving it on the ground the signal starts at one frequency (for me about 
436.8035) and ends at another (436.7830).  To compensate for doppler at the 
satellite receiver the uplink moves from 145.847 to 145.853.  Being on 
frequency with the satellite is very important, and not being able to do so 
on an FM satellite only contributes to the calamity.

>3) ECHO has a broad enough uplink 2m channel receiver
>     so that no doppler tuning is required on the uplink.

While this is possibly true, the best results (clearest signal, lowest 
power required) will be by a station that is in the middle of the capture 
range.  If you are off the middle of the capture range, well - in a battle 
between two equal stations, one off and one on, you will certainly not have 
the same results as someone right in the middle.

>4) ECHO FM mode was designed for people with channelized
>     FM equipment.

Huh?  Perhaps from the extent that it operates on a pair of frequencies 
that are common to channels.  After that the laws of physics apply, and 
they weren't designed for people with channelized equipment.  Bob, I 
guarantee you that Echo still suffers the effects of doppler.  I saw it 
happening on my W32A when I was working handheld.

>5) No linear CW/SSB satellite requires PL and it would make
>     no sense to do so.

But we are talking about FM satellites.  The TS-790 with the TSU-5 worked 
in satellite mode.  So what you want us to believe is that Icom and Yaesu 
both wasted time, effort and money to implement a totally useless feature 
in satellite mode?  That's utter nonsense.

>So rather than condeming the radio, I'd suggest simply
>turning off linear-satellite mode and operating cross band
>FM like the satellite was designed for.... The radio will work
>with PL just fine that way.

While the satellite may be designed that way, the laws of physics dictate 
otherwise Bob.  You won't find me abandoning satellite mode on my 910H to 
work cross band, which I can.  I'd have a much less enjoyable user 
experience doing so and would be more subjected to QRM.  From this I can 
speak with authority because I have tried it both ways.  There is a huge 
difference.

73,

Emily


---------------------------------
W0EEC - CM87tm
AMSAT Area Coordinator - San Francisco Bay Area
http://www.projectoscar.net   http://www.PlanetEmily.com 
http://www.emilyshouse.com/experthams/ao7/

Help Pay For Echo - http://www.amsat.org/amsat/sats/echo/index.html
W0EEC - CM87tm
AMSAT Area Coordinator - San Francisco Bay Area
http://www.projectoscar.net    http://www.PlanetEmily.com 
http://www.emilyshouse.com/experthams/ao7/

Help Pay For Echo - http://www.amsat.org/amsat/sats/echo/index.html
---------------------------------  
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