3
OPERATION
INPUT SENSITIVITY
To set the "INPUT SENSITIVITY" firstly set the "delay" switches to 1 FIELD DELAY and the
"INPUT SENSITIVITY" controls fully counter clockwise.
With a signal (1kHz SINEWAVE) of +6db at the input socket (channel 1 left) rotate the
"INPUT SENSITIVITY" control clockwise and either monitor or measure the signal at the OUTPUT
socket (channel 1 left) until it is +6db. (UNITY GAIN)
Repeat above for the other 3 channel pairs.
The LED indicators above each control show "signal present" (-20db) and "peak"
(0db).
Maximum signal output just before clipping into 600 W load is +15db. (Can be adjusted
internally) hence with a +6db input the headroom will be +9db.
DELAY SETTING
NOTE: An internal jumper is used to select either PAL or NTSC "field" increments. (See below)
The four Rotary switches (1 per channel pair) are used to set multiples of "field" delays (20m
/ PAL) or a "RELAY BYPASS".
The switches have sixteen positions and can be rotated in either clockwise or counter
clockwise directions with "click" positions 1-15 increasing or decreasing the delay by 1 field.
Position 1-15 in PAL SET MODE = 20-300 ms (1-15 fields)
Position 1-15 in NTSC SET MODE = 33-495 ms (1-15 fields)
Position 0 in both PAL / NTSC will put that channel pair into "BYPASS" connecting the
INPUTS directly to the OUTPUTS.
On Power off or Power fail the "BYPASS" will be initiated as above regardless of the delay
set switch position.
A "BYPASS" "hold" of approximately 1 second is initiated when the 8110 is powered "on", to
allow random data in the memory to be purged before "normal" operation. Switching to "BYPASS"
in normal operation will also have this "hold" time.
Set the other channel pairs as above.
TO SET DELAY INCREMENTS TO NTSC FIELD (33ms)
1) Power off and disconnect the power cable from the 8110.
2) Remove the cover plate
3) Locate LK1 on the DIGITAL PRINTED CIRCUIT BOARD. (See PCB layouts)
4) A small "jumper" link should be fitted to one of these pins if "PAL" was the previous setting
Remove this and locate across both link pins. (Shorting LK1)
5) Re-fit the cover plate and power cable.
6) Power on the 8110
7) Delay set increments will now be in steps of 33ms (1 field / NTSC)
