[amsat-bb] S band: Too early, as I said

Robert McGwier rwmcgwier at comcast.net
Sun Sep 10 07:31:47 PDT 2006

As I said previous to this note,  our analysis and all of this hoopla is 
released too early.   We have not fully prepared for the onslaught and 
we have only done a <<technical analysis>> that resulted from the 
assumption that Galileo was going to cause loss of L band.  It is not in 
our political interests frankly for this understanding to be widespread 
but now that it is,  we might as well go ahead and do all of our "worst 
case scenario" analysis in public.

It is my understanding that Argentina and the Netherlands have LOST 
2400-2450 for use by terrestrial radio amateurs because of interference 
from amateur radio operators (primarily BLOODY ATV) to 802.11 services.  
Amateurs have been told to stop transmitting in those bands.  I need 
much more information.


Please send to me DIRECTLY your personal, first hand knowledge of loss 
of 2400-2450 IN YOUR COUNTRY or any other country FOR WHICH YOU CAN 
PROVIDE DOCUMENTARY EVIDENCE.  I have no interest whatsoever in rumor.  
I need facts.   If this phenomenon is widespread,  then the use of S 
band as an uplink is a  useless argument to be having and the whining 
can stop.  ALL that was done in San Diego was a technical analysis.  No 
legal or political analysis has been done at all.  We are not prepared 
to say "This is what we are doing".   We are prepared to say "This is 
what the technical folks came up with given the assumption of the loss 
of L band and the assumption that 9 cm would be politically 
unacceptable".   NOTHING ELSE should be assumed now. 

But let me repeat (ad infinitum?),  I am personally interested in 
managing the design and building of an instrument that accomplishes the 
AMSAT vision statement.   If I find that we have essentially lost all 
microwave bands we have in the amateur satellite service that can be 
used effectively to support the vision statement (given engineering 
computation and "circuit practicalities"),  I will lose interest in 
managing this whether it be an AMSAT political decision or an 
international frequency disaster which we have allowed to go unanswered 
in any substantive way.   AMSAT-DL is the perfect vehicle to produce P3 
spacecraft with our help where needed.  We do not need to duplicate 
their efforts.

DO NOT send your anecdote to this list.  Send your FACTS to me,  with 
supporting evidence, so I can summarize what I believe the impact of 
this to be for the AMSAT BOD.


AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats,
"You see, wire telegraph is a kind of a very, very long cat.
You pull his tail in New York and his head is meowing in Los
Angeles. Do you understand this? And radio operates exactly
the same way: you send signals here, they receive them there.
The only difference is that there is no cat." - Einstein

More information about the AMSAT-BB mailing list