9
AP Series
Instruction Manual
Option 17 - Sub-Band Input for AP60
Description
The sub-band Option 17 consists of a block converter placed before the product's main RF input. The converter trans
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lates the entire T-channel band (5-50 MHz) to the high VHF TV band (173-218 MHz), and presents this as the sub-band
converter output on the rear panel. This output is coupled via a short coax jumper to the basic product's RF input. The
converter local oscillator operates at a frequency of 168.25 MHz. Therefore, at the output of the converter, standard
"T" channels appear as channel "7" for "T-7", channel "8" for "T-8", and so on. Selection of the appropriate T-channel to
be processed is made via the front panel input frequency select DIP switches following the channel "7" settings for T-7,
channel "8" settings for T-8, and so on.
A complete frequency selector chart is provided below. In addition, one may use the frequency chart supplied with the
product by following the settings for standard broadcast channels 7-13 as if they were T-7 through T-13.
The sub-channel converter has a conversion loss of approximately 8 dB. Therefore, a nominal input signal level to the
sub-band converter should be between 3 and 23 dBmV to ensure proper operation.
Connections for Sub-Band Options
1. Set the Sub-Band selector located on the back panel to the ON position.
2. Connect the cable containing the Sub-Band channels (T-7 thru T-13) to the Sub-Band input.
3. Using the supplied loop-thru cable, connect the Sub-Band output to the RF input.
4. Set Switch 1 to the STD Mode. Set the AP60 front panel switches (Input Channel Selector) for the desired
Sub-Band channel by using the chart below:
For operation of the AP60 with Non-Sub-Band channels, set the Sub-Band Selector to the OFF position and connect the
coax cable from the system to the RF Input on the back panel.
1 2 3 4
SWITCH 1
STD
IRC
HRC
Broadcast
SWITCH 2
8 4 2 1
Ones
Tens
8 4 2 1
T7
T9
T10
T11
T8
T12
T13
INVOKED
REVOKED
(UP = ON)
(DOWN = OFF)
