High Sierra 4500, Alert/IFlows VHF Data Receiver 5.0MAINTENANCE, 5.0TROUBLESHOOTING

5.0MAINTENANCE

The Model 4500 ALERT/IFLOWS VHF Data Receiver is a maintenance-free unit. However if an external battery is used then it should be periodically tested with a battery charger-discharger similar to the High Sierra Electronics Model 5605.

5.0TROUBLESHOOTING

The majority of failures are due to faulty connections. Check that all connections make a secure termination and are free of corrosion. Verify that the frequency switches are set to the proper frequency. Verify that 12 VDC is present at the terminal strip.

If the receiver will be used with a High Sierra Electronics Model 1000 decoder, the decoder may not function properly if the receiver remains unsquelched between transmissions. With the speaker switch turned on, there should be minimal RF noise between received transmissions. If the receiver is located in an environment high in RF noise, the squelch setting may need to be adjusted. The squelch has been factory adjusted and should not be changed without first consulting High Sierra Electronics (In addition to an IFR, the Model 4500 Receiver radio requires a Model 3200-22 Programming kit to adjust the squelch).

The audio signal present at the decoder end of the audio should be 700 mV p-p. If there is a long cable run between the receiver and the decoder, the audio level may need an adjustment from the factory setting. Audio level may be adjusted to 700 mVp-pwhile monitoring receiver output with an oscilloscope (see appendix 8.3).

For technical assistance with this product, consult High Sierra Electronics technical personnel. Phone: 1-800-275 2080 or FAX: 1-530-273-2089 between 8:00 AM and 5:00 PM Pacific Coast time, Monday thru Friday. E-mail questions or comments to: info@highsierraelectonics.com.

Model 4500 April 2004 4