Gift to

path mi les; d iv ided by
186,000 miles per seco nd, it
me ans a .2542-sec o nd path
ti me.
ATS gro und statio n transm
itter s vary in power fr om
50-500 Watts d epending
upon comm u ni cations reliab
ility, geograp hical locat
ion, antenna ga in, and
ot her co nsiderations. The
Antarctic sta t ions operate
with 5()(}-Watt transm itters,
while many research vessels
do w ell w ith 80 Watts
into an eight-turn helix.
O nce th e sate ll ite transponders
have been saturated
, ad d it iona l uplink
power is wa sted. The entire
d ownlin k transpond er power
aboard each spacec raft
is about 40 Watts. Sate ll ite
ou tput pow er is a f u nc t ion
of th e input. ATS-3 is desig
ned so that two o r m ore
uplink signals w ill prod uce
the co rrespond ing output
rat io s. For exa m p le , if
upl ink signal A o n channe l
two is twice as strong as
uplink signal B o n channel
fo ur, the downl ink pow er
w ill exhibit this same twoto-one
po w er ra t io. A1 $-1
co mpresses the weake r signals
and th e downl ink is not
a li near function of the
uplin k.
It is ti me now for you to
form u late an operationa l
p la n. Your first step is to o b­
t ain t he " AT S VHF Experiments'
Guide." Thi s ca n
be pr o c u red by writing:
ATS Experim ents M an ager,
Offi ce of A p p l ica t ions ,
Code ECS, N ASA, W ashington
DC 20546.
Finally, ATS usage proposa
ls m ust be well thou ght
ou t, th o rou gh ly descri bed,
and un ique in approach . If
yo ur pr o posal is rejec ted
and yo u st ill be lieve yo u've
come up with a great id ea,
co n t a c t y o u r Co ng res s­
man - he may have a sy m­
pathetic ear and pla ce a
call to NA SA o n yo ur behalf.
In any eve nt, good
luckl.
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V' Reader Service-see page 274 73 Magazine· Octo ber, 1980 53