User's Manual

P-379 Processor

4. Input channel selection. Select the desired input source type and channel using

the front panel controls. Because the built-in input offset feature automatically

removes any input offset, no calculations or adjustments are required. The

Technalogix P-379 Agile Processor has a built-in delay in the input- and output-

channel tuning circuits. In order to change channels, hold the channel select

switch in the up- or down-position for at least three seconds. When the circuit is

defeated, channel selection will proceed normally. Channels can be changed

one at a time by raising/lowering the channel select switch one channel at a time;

or channels can be scanned rapidly by raising/lowering the channel select switch

and holding it while the unit rapidly moves through the channels. However, once

the channel select switch is released for more than one second, the delay-tuning

circuit reactivates.

Until an active input channel is selected, the input channel display will flash.

Once the input channel is selected, the input channel display will stop flashing as

long as the input signal level is within the required capture range. If the input

channel display continues to flash after a known, active input channel is selected,

check the level of the input signal to ensure it is at adequate levels for detection

(from –5dBmV to +10dBmV) and not too low or too high.

The FREQUENCY LOCK LED on the front panel display may also blink during

input-channel tuning. This is because, when the unit is being tuned, an RF-

output muting circuit is enabled to ensure that moving RF carriers do not interfere

with any existing channels on the cable system.

T-Channel Input Option. To use the T-Channel Input Option, if the unit is so

equipped, ensure that that a T-channel input source is attached to the F-

connector marked “T-Channel IN” on the rear panel. Position the T-Channel

switch on the rear panel of the P-379 to the “ON” position.

If your P-379 has green LED’s on the front panel, above the channel select

switch, the LED marked “T-channel” will illuminate when a channel in that range

is selected. If your P-379 does not have green LED’s, but does have a three-

number channel display, the selected T-channel will be indicated by a “-“ (minus)

sign preceding the number of the T-channel selected. When in T-channel

operation, only the T-channels will be selected.