float charger will keep the battery charged. NOTE: it is important not to reverse polarity when connecting power to the Model 4500 Receiver.
In areas subject to electrical storms it is advisable to use a lightning protection device in the antenna transmission cable to protect the receiver from damage due to "near hits". During periods of electrical activity the receiver may present a shock hazard should the antenna be struck by lightning. During these periods it is recommended that personnel stay clear of the receiver and associated equipment to reduce the chance of injury due to this hazard.
3.0OPERATION
The Model 4500 receives frequency modulated RF signals from remote transmitters and repeaters. These signals are then amplified, demodulated and the resultant audio signal is sent to the decoder. The audio signal consists of tones having a frequency of either 2133 Hz or 1920 Hz.
The Green LED on the front panel indicates if power is being supplied to the receiver and should always be on.
The speaker
4.0RADIO
4.1Frequencies available
If the systems operating frequency is specified, then the radio is preset at the factory with the selected channel highlighted on the cover. To change or select a frequency, remove the four screws that secure the transceiver cover. Using the channel selection guide on the inside of the receiver cover, set the
Frequency between 148.000 and 174.000 MHz can be programmed into these radios. The
Model 4500 April 2004 | 3 |
