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Instruction Manual

E04819 Issue 1.0

However, if the antenna is not vertical when transmitting, the

beam will be angled either too high or too low (Fig 7.17).

Fig 7.18 - Effect of heel on range of 1 m (3 ft) marine antenna

Fig 7.17 - Effect of heel on range of longer whip antenna

Here the wider beam of the shorter antenna will be more univer-

sally effective, although the signal will be weaker (Fig 7.18).

Therefore, for vessels with a large heel angle (small sailboats) a

short masthead antenna would be a better choice. Your local

agent should be able to provide speciﬁc advice on the appropri-

ate type of antenna.

Warning The antenna coaxial cable and any connectors

used must be rated at 50Ω. Under no circum-

stances should standard domestic TV cable and

connectors be used. Incorrectly rated cabling and

connectors could result in power not reaching

the antenna, but power could also be reflected

back into the radio, damaging it in the process.

The quality of any connections and integrity of the cable (with-

out breaks in the sheathing) will directly affect the performance

of the radio. Poor soldering or corrosion of the terminals can

impair performance. We recommend that screw or crimp termi-

nal-type connectors are not used for any through-deck ﬁttings –

a good quality waterproof solder terminal connector will be less

susceptible to poor connection due to corrosion of the contacts.

Simrad RS87 User Manual

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