Bandswitch Failures

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Bandswitch Failures

Bandswitch failures are caused by:

1.) Improper installation or wiring of switch

        a.) Improper Wiring
Techniques

        b.) Improper contact
Alignment

        c.) Contamination-of
or damage-to switch

2.)    Improper relay timing or defective
antenna relay

        a.) Transmit contact
closes after input contact closes

        b.) Transmit contact
opens before input contact opens

3.)   
Failures in antenna systems

        a.) Intermittent arc,
open, or short in a tuner

        b.) Intermittent arc,
open, or short in an antenna

        c.) Intermittent arc,
open, or short in external lightning protection devices

        d.) Intermittent arc,
open, or short in a feed line or connector

        e.) Sudden large
change in either SWR or antenna impedance

4.)    Improper loading of amplifier

        a.) Loading control
set too far meshed (loading too light)

        b.) SWR or antenna
impedance beyond matching range of amplifier   

5.)    Excessive drive or drive power
transients

        a.) Exciter has
transients or leading edge overshoot

        b.) Operation power
peaks higher than tuning peaks

6.)    Excessive current

        a.) Improper
loading (loading too light)

        b.) Improper
connections

        c.) Improper switch
ratings