[amsat-bb] Re: PCsat and My mailbox

[Mineo Wakita <ei7m-wkt@xxxxxxxxxxxxxxx>]

Ok, I understood for your helpful suggestion.
I will another test for PCsat after this.

Bob Bruninga wrote:

> Thanks for this test and signal report, but I should take this opportunity
> to remind others that connections "via" PCsat are not desired.  The PBBS
> on PCsat is reserved for remote travelers in footprints far removed from
> any existing ground stations so that these isolated travelers have a means
> to communicate.
> 
> There is also the abilty to store and forward a few priority and/or
> emergency messages from similar distant travlers holding nothing but a
> TH-D7 APRS HT in their hand.  To assure a good quality of service to these
> users we ask that such users file a travel plan in advance so that we can
> equitably share and manage this limited resource.
> 
> Connected Packet (connections) are usually very inefficient via space
> links and waste valuable spacecraft power.  This is especialy true over
> populated areas where QRM multiplies the number of retries and thus the
> waste of power.
> 
> PCsat is in a phase of maximum eclipse and minimum power budget.  In fact,
> the power budget on PC sat assumes the packet transmitter is on only 4% of
> the time.  Just one connection and all the acks and retries easily exceeds
> this budget.  Keeping PCsat batteries charged during this time is taking
> a lot of our time and effort.

----------------------------------------------
Name : Mineo Wakita / JE9PEL, JAMSAT member
Mail : ei7m-wkt@asahi-net.or.jp
URL  : http://www.ne.jp/asahi/hamradio/je9pel/
QTH  : Yokohama Japan, GL:PM95TJ
Date : Nov 13, 2001
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