Lafayette HE 20 D Owners Manual

Page 7

llV DC POWER CONNECTIONS

CAUTlON: 'lhlu transcolvcr la doniuuml {or one only in vehlclu employing a tmgatwo ground tyntom.
DO NOT USE IN POSITIVE GROUND VEthLES.

The Rad lead in the DC pownr cahln should be counted to the main positive batte ry source in th: V:-
hiulc. 'Hot point» normally available .tro tlm accessory post on the lgnition switch or the achMnry
do of thc lute block. Thu Slack land should bu.- conucctetl to the mom. firewall or any other point that
is cormccted to the vehicle chassis (negative battery potentul). Make sure the Red load has been con-
nectul tn 1; point whlch provide: power only when the ignition switch in turned an.

A» a (hull Itep, the 11-91:; female connector at that and of the DC power cabla should ho nttauluml m
the 11-pin male cannector a: the roar of the t ransc 1: iv«: r. CAUTION: Always lim- up the Key-
way pronerly beta to pushing the cable conncctor onto the transceiver. Do not attempt to torts the
connector ontn tlm pin- -- whan properly lined up. thu connector will slip on easily.

lMPOK'l'ANI'. Tho lolldoutnto lZ-trnualltcr) DC power nupply circuit in doolgnud to opnrnto within
an input voltage range of 11.5 to 14.: volts DC. '10 Avoid possible (allure of the transistors, you
should nuke sure that the vehicle supply voltage does not uxcocd 14.5 volts at any time. It necessary.
adjust the voltage regulator to cut out at this voltage (14.5).

ANIENNA CONNECTION

The antenna lead-in cablu shOuld be terminated with a PL-LS) typo male connector. Attach :o the
matching autumn luyul connector at the rear of tho tranucciver.

AN'IENNA CABLE

For uytlmum nuulu in a mobile ln-tnllntlon. the length of tho RO-SBIU 50 ohm coaxial cable should
be ll tt. *1 tn. or multtples that-ecu It. 6 Ln. . ctc.). Length: other than umltlplca at 11 It. 9 at.
many bu used when pcrlcct antenna matching Ixiutu. However, thlu tdcal condition in generally dlttl-
cult tn obtain because of a number of factors which affect impedance, such as the type of antenna, its
tuning, ho be 1311'. nlnvo ground, and tho tranlmlulon lino omplnynrl.

When the use of tho partlcular lengths upcclllod rcnultu tn an over-long llno. tho cmcnn nlmultl he
wound in a neat coll not 166: than 8 Inches ln ninmcter.

MICflOPHONE BRACKET

'l'ho microphone bracket may ho- attnchad to 1116 lult or right side of the uupport bracket. or shown ln
Figure 3.

MICROPHONE BRACKEY MOUNYED
ON SUPPORT IRACKET
(MOON!)

FlGUIE 3