Comtek PR-75a Instrukcja Operatora Pobierz pdf (Strona 6)

Page 4

PR-216 OPERATING INSTRUCTIONS

Frequency Selection (216-217 MHz)

The PR-216 personal receiver can operate on one of 76 available channels

between 216 MHz and 217 MHz. COMTEK’s channel designations indicate

both standard narrow-band channels and high-fidelity,

wide-band companded channels. Channels 1-40 are

narrow- band channels (5 kHz deviation) offering

compatibility with other manufacturers’ receivers

such as the Phonak MicroEar. Channels 41-60

are high-fidelity, wide-band companded channels

(10 kHz deviation) for use with COMTEK transmitters.

Channels 61-79 are standard narrow-band channels for

compatibility with other manufacturers. COMTEK transmitters

automatically transmit the proper modulation when set to channels

1-40 for narrow-band or 41-60 for wide-band companded channels.

After you have determined the channel on which you are going to operate,

position the two rotary switches to indicate the channel. The left rotary

switch is for tens and the right rotary switch is for ones. To select channel 41

(216.0250 MHz), position the left rotary switch to point to 4 (X10), and

position the right rotary switch to point to 1 (X1). Refer to frequency charts

on pages 5 and 6 for selectable frequencies.

Multiple Channel Operation

Simultaneous operation with more than two channels

requires frequency coordination to avoid intermodulation

interference. This interference could result in poor or unusable performance.

When multiple transmitters are broadcasting, the RF signals will “mix”

together generating additional signals. If these product frequencies are

too close to a frequency which you are using, you will experience this

type of interference. This condition is common to all radio receivers to some

extent. This interference produces whistle and whine type sounds

and/or reductions of range. To avoid this type of interference, you should

select frequencies from one of the standard groups (see frequency group

charts on page 5), or you can use COMTEK’s frequency selection guide

software to determine appropriate frequencies. Contact COMTEK to

obtain a free copy of the frequency selection software or download it off

the web at www.comtek.com/software.htm.

IMPORTANT

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Comtek PR-75a Instrukcja Operatora Strona 6