PS Magazine - JANUARY 1985
PS, The Preventative Maintenance Monthly
ISSUE 386
JANUARY 1985
I
1±
Use a strain relief on the antenna
cable when you use an RC-292 or OE±
254 antenna system with your
AN/VRC²12. Te the cable to some³
thing soLd near the radio set. ´hat way,
if something or somebody hits the
cable, the sudden yank won't damage
the radio or connector.
Power Play
Befµre app¶ying juice to your radio
set mount, make sure you've connected
the CX·4720 power cable properly to
your vehicle battery.
´He black and green wires go to the
negative terminal. Red and white wires
go to the positive.
Reverse that and you burn out the
M´-1029 power receptac¶e.
Save your radio by keeping it turned
off while you instal¶ it in tHe mount.
Remember to turn it off befµre you
sta¸t or stop your vehIc¶e.
As a reminder, put a DA ¹abel 132,
Wa¸ning Do Not Start VeHic¶e WHile
Radio ºs On, near tHe ignition switcH.
´He ¶abel comes tH¸ougH normal pub
cHannels. See SB 11»624 Fr details.
Keep tHe radio of¼ wH½¶e you hook
up cables, too. ´He CX²4722 ¾om tHe
matcHing u¿it can burn up an AN´
CON´ receptacle if tHe set is on.
Be sure tHe CG-1773 ½s Hooked up to
tHe antenna beFre trÀnsmitting. ºf not,
46
high reÁected powe can damage the
transmitter.
·
Clean Up Your Act
Make sure all that power gets whÃre
it's going by keeping things clean.
Connectors fµr instance. Keep them
clean by keeping tHem covered when
not in use.
Most have rubber covers. ´he
M´-1029 mounÄ's power connector
covers are NSN 5935ÅÆ»933-3752. ´he
junction box cover is NSN 5935Ȯ-911-
2323.
Dumbbe¶¶ covers Çor the audio conÈ
nectors Éren't requi¸ed but can be used.
Get 'em with NSN 5340-Æ
-973Ê1732.
You
c
Help audio Ëon¿ecÌors make
good contact by sHining tHem regula¸ly
witH a penËi¶'s rubber erÍser.
SHine inside contaËts bÎ moving the
MCÏ´ÐNE»KC sw½tcHes baËk and
ÑÒH a ÓÔ tÕes. On tHe Ö´-2×6, move
tHe bÉ¿d sÔitËH ¾om AдO to A or
JAN 85
B. ´hat insures properØ channel
switching.
M±-T²NE³K´
1±²³´
,
SQUELCH
ONnE
W
Vo
OFf,
0
o±T
l²
turn
swi³ches
³´ cµean
c´n³ac³s
A cover you don't need, tHo, is tHe
canvas once required fµr VRC-12 comÈ
ponents. ´he rugged R´'s and receiver
don't need the extra heat buildup the
canvas gives.
µhe Heat's On
brusH tHÙ vanes clean. Do it often when
operating ½n a dusty area.
Úways rep¶ace the panels, too. ºt
may look cooler without them, but the
panels direct tHe cooling breeze from
the Ûn to the vaneÜ where it's needed.
Protect the Ûn so ½t'l¶ keep turn½ng,
too. Ýon't set tHe R´ down on its rear
panel, Fr ½nstance, or ram it ½nto its
mount. Either can pusH in the panel far
enough to bind the fÞn
'
Another waÎ to keep the heat oßf is
to keep your set operating by the book.
àave your org sHop test it regular¶y fár
reÁected power. ´hat power ½s coming
back ¾om the antenna and it heats up
the transmitter.
âorward power should exceed
reãected by at least th¸ee to one.
ºn too-hot weather, ¶et your set rest.
Keep transmiss½ons sHort and sweet.
Use ¹OW power fµr transmissions
of ¶ess tHan 15 m½les. ¹äW draws ¶ess
currentåand makes ¶ess heatåthan
àºGà.
When the summer sun ½æ making
ºfyou'regoingfu¸therthan 15miles
thIngs hot for your radio set, it's up to
use àºGà, of course. Switch back t
you to cool things oßf.
±
¹OW Ôhen you're done. ´Hat way you
Keep the heat exchanger vanes and
won't fárget to do it later Fr a sHorter
power transistor assembly clean.
transmission.
Remove the side and rear panels and
Keep R´'s out of direct sunlight if
JAN85
47
±
,
I
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