STANDBY POWER - TM-11-5820-918-130038

TM 11-5820-918-13

6:1. Any VSWR less than 10:1 is acceptable for chirpsounder use in typical appli-

cations. The TCS-4B cannot be damaged by any VSWR (from open circuit to dead

short), but the quality of the received ionogram may be greatly reduced when using

poorly matched antennas. It is desireable (but not absolutely necessary) to operate

with antennas that match to within 4:1 VSWR over most of the frequency range of in-

terest.

3-9. STANDBY POWER

3-10. In the event of a power loss, all displays will turn off. If battery power is

on, the internal clock will continue to function and the blanker memory will be re-

tained until primary power is restored or the batteries run down.

The duration of

battery life is dependent on ambient temperature. At 23C, battery life will exceed

24 hours. At 0C, battery life may be no longer than 8 hours. When primary power

is restored after an interruption, the transmitter may generate a random out-of-se-

quence frequency sweep. When this sweep is completed and an automatic reset occurs,

normal operation will commence on the next programmed 5-minute interval.

3-11. SHUTTING DOWN THE TRANSMITTER

3-12. If the transmitter RF output is to be turned off, but time synchronization main-

tained indefinitely, leave the 1024 AC power on, and shut off the 4011 (and 5018)

power.

3-13. If all transmitter power is to be shut down, but time synchronization (tempo-

rarily) maintained, make sure that the BAT switch on the 1024 is ON.

3-14. If transmitter is to be shut down with loss of time synchronization, turn BAT

switch OFF. Then, turn off power switches of the 1024 and the 4011.

3-15. For shutdown of more than two days, the following steps should be performed:

a. For transmitters with the non-rechargeable standby battery supply (P/N 6025-

1008), turn BAT switch OFF, and then turn off the 1024 and 4011 power switches.

b. For transmitters with the rechargeable standby battery supply (P/N 6025-1018),

perform these steps:

(1) Operate equipment from normal AC line power for 24 hours (minimum) to

fully charge batteries. (Batteries must not be stored if discharged.)

(2) Turn on BAT switch on 1024 front panel.

(3) Turn off AC line power to TCS-4B.

(4) Press TEST switch on 1024 front panel and verify green BAT test indication.

(5) Remove battery supply from 1024 and momentarily press battery cutout push-

button ( S 1) through hole in battery box top cover.

(6) Reinstall battery supply in 1024 with AC line power off.

(7) Press TEST switch on 1024 front panel with AC line power off and BAT

switch ON. Verify that BAT test lamps on front panel do NOT light.