Amateur Radio Today - Free and Open Source Software
Amateur Radio Today - Free and Open Source Software
Amateur Radio Today - Free and Open Source Software
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VHF And Above Operation<br />
C. L Houghton WB6IGP<br />
SaIl Diego MtTowave Group<br />
6345 Badger Lake Ave.<br />
San Diego CA 92119<br />
Microwave Moonbounce<br />
Microwave moonbounee might not<br />
be everyone'S cup 01 lea. at least nol<br />
tho5e who lhir*. mierowave COlTUTlUr*::alions<br />
is llne-ol-sighl only (implying short<br />
distances only). Long-distance cammunica<br />
lJons Is quite possible on the microwave<br />
bards. <strong>and</strong> to prove it let's go<br />
to the extreme: mooo eccrce. This paltl<br />
covers communieations of over II half·<br />
million-miles. Possible? Yes, indeed. As<br />
II matter of lact, communication was<br />
made between WA7CJO in Phoenix,<br />
Arizona. <strong>and</strong> G3WDG <strong>and</strong> G4KGC in<br />
Engl<strong>and</strong> on 106Hz moorbounce. What<br />
follows Is the account from G3WDG<br />
covering this contact <strong>and</strong> some 01 lhe<br />
methods he used 10 make II.<br />
· 0 0 January 31 , 1993 , at 2230,<br />
G3WDG <strong>and</strong> G4KGC made rwo EME<br />
OSOS on 106Hz. This is be6eved kI be<br />
the firs! made 011 this b<strong>and</strong> from the UK.<br />
The initial eso was with WA7CJO in<br />
Phoenix, ArIzona, 812230. This was the<br />
second anempt. The first lest on January<br />
30 was parti ally successful as<br />
WA7CJO was heard at good signal<br />
strength at G3WDG's location for II 01"1&<br />
wayoontact<br />
"The anlenna in use In the UK was a<br />
to-root solid dish (Andrew 11 GHz version)<br />
mounted on an EVA: mount origlnaRy<br />
Intended for satellite TV use bU1<br />
modifl8d lor motor drive. The tish was<br />
scraped off from a local electronics<br />
company where G3WOO used to work.<br />
During Christmas 1992 the foundation<br />
was laid lor the tower <strong>and</strong> a week be·<br />
lore the first tesllhe dish was pu1 into its<br />
mount <strong>and</strong> the elevation azimuth drive<br />
motors were also Installed.<br />
"The rest of the equlpmenl consisted<br />
of a Hughes 28 watt TWT amplif ier.<br />
WASVJB <strong>and</strong> KY7B ~ in acquiring<br />
this tube <strong>and</strong> in relurtlis/W1g the powet<br />
supply. The TW T was driven by a<br />
G4DD K-00 4 <strong>and</strong> a G3WDG-001-designed<br />
transmitting module lor use in<br />
the 10 GHz system . An early design<br />
G3WDG-004 prototype HEMPT preamp<br />
was used to drive the receive converter.<br />
<strong>and</strong> a G3WDG-002 10 GHz converter<br />
was used in the 10 GHz converte r.<br />
(Nole: Designalions such as G3WDGxxx<br />
indicate dinerenl modules that are<br />
(e)<br />
Earth<br />
(a)<br />
(b)<br />
......---- . ~,.<br />
----<br />
--.... --.. .-.._-..<br />
.. ' • '. •<br />
..<br />
• • • •• •••<br />
.'"<br />
.- ..<br />
'.-... ... .. ... ...... '. "';<br />
... ...<br />
.. ...<br />
• • •<br />
• • .. .. ... • ••<br />
'".. .. .. .'.."<br />
... ...<br />
• ; .4••.<br />
'"<br />
. . '"<br />
-.. ..'<br />
•• • •<br />
.....<br />
.., ..' -'"<br />
•••<br />
... ..<br />
• •<br />
•••<br />
•••<br />
• ••<br />
• ••<br />
...<br />
•••<br />
•••<br />
......" .<br />
...<br />
.. ... ...... ......<br />
....... .' .......<br />
., ' .. .. " ...<br />
II·'"<br />
'". .. ... .. .<br />
• • • • • • ••<br />
..... '" .<br />
• • • •<br />
(e)<br />
Figure t, Basic EME ~nce aperatioll. Transmit <strong>and</strong> receive cfs/l antemas are shown lNith a 1 06gffHJ beam wk1ItJ. Note: Rellected Signal is m
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