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10
When decoding a transmitter, the VR60 receiver will show “NO SIGNAL” on the display until a
transmitter pulse is received. The LED on the front panel (below display) will flash to indicate that
a signal has been received by the VR60 receiver and is being sent to the decoder. The data from the
transmitter is displayed in the correct units, as assigned in SETUP. For example,
TEMP: 4 "C
DEPTH: 270 m
When decoding multi-channel transmitters, two error messages other than NO SIGNAL are
possible, MISSING PULSE or LOST SYNC. These messages are the result of not receiving either
a data pulse or a synchronization pulse, and are not sent to an attached printer.
The following features are available while decoding a transmitter:
6. The display unit returns to the ENTER COMMAND level by pressing ENTER.
7. The frequency can be changed by pressing the FREQ key (see
Set Frequency
section). After
changing the frequency the VR60 receiver writes the new frequency to the printer port, and then
resumes decoding.
8. The transmitter number and the time can momentarily be displayed by pressing NEXT.
9. The display will maintain its current value while any digit key is pressed, and will continue once
the key is released.
Decode Period
The
Decode Period
option is primarily used to identify pingers, but may also be used in the
calibration of telemetry transmitters. To enter the
Decode Period
option, press the DECODE key at
the ENTER COMMAND prompt. The display reads:
TR #? (1-12)
(0 for Period)
Select the 0 key followed by the ENTER key (or just select ENTER) and the decoder will display
the period in milliseconds (ms). The display will show “NO SIGNAL” until transmitted pulses are
received.
The frequency can be selected with the Channel switch, or with the keypad when the Channel
switch is in the EXT position. There are eleven preset frequency options available on the Channel
switch, which are listed on the inside cover of the receiver. When the frequency is selected with the
rotary switch, only the period is displayed with each pulse (the frequency in not shown). When the
frequency has been selected with the keypad (see
Set Frequency
section), both the period and the
frequency are displayed with each received pulse.