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Mains supply and safety notes
The modulator is supplied with a fitted mains plug and may be plugged directly
into a 13 A (BS 1363) socket outlet. If socket outlets of a different type are in use,
please refer to the safety instructions on page 4.
Alternatively the plug may be cut off and the modulator wired into a fused
connection unit, fitted with an approved 3 A fuse to BS 1362. This method of
connection is recommended for permanent distribution system applications, since
it reduces the risk of tampering and accidental disconnection.
If the modulator is not connected to the mains using the fused plug supplied, or
a fused connection unit, it must be protected by means of a fuse or MCB at the
final distribution board of rating not exceeding 6 A. An isolating switch should be
provided to allow the unit to be disconnected from the supply when necessary.
Any fixed wiring installed to supply power to this modulator should comply with
BS 7671 (IEE wiring regulations, 16th Edition).
The proMOD1 modulator is of Class 2 construction and does not require a
protective earth connection. This does not obviate the need to provide a circuit
protective (earth) conductor in the supply wiring, as required by BS 7671.
Distribution systems supplying signals to more than one household should comply
with the safety requirements of BS EN 50083-1. This effectively requires the
system to be earth bonded. (The use of isolated outlet plates is no longer
recommended since they compromise screening integrity and allow ingress of
interference.)
Setting the output channel number
The channel setting buttons on the front of the unit are normally locked to protect
against accidental change or tampering. To change the output channel setting
proceed as follows:
1. Press and hold both buttons together for about two seconds. The channel no.
display will start to flash.
2. While the display is flashing, adjust the channel no. as required using the s
or t button.
3. When the display stops flashing (about two seconds after the last button press)
the new channel setting is stored in the non-volatile memory.
4. Repeat from Step 1 if necessary, to try a different channel, or if the time-out
occurred too soon.
If the output channel is changed after installation, all TV receivers which are
using the modulator’s output will need to have the appropriate channel setting
retuned.
Notes on channel selection
Choice of an appropriate modulator channel setting is important to avoid
interference problems.
n The modulator output should not be set on the same channel as any off-air
analogue or digital signal carried on the system. Using a channel which coincides
with an off-air DTT signal is a common cause of a noisy looking modulator
picture.
Page 2
n Also avoid adjacent channels (N±1 relationship).
n Avoid any combination which results in signals spaced 5 channels apart (N±5
relationship).
n The old ‘avoid N±9’ rule can usually be ignored, due to the improved image
rejection of modern TVs.
n Any other modulators in the same system (in VCRs, etc.) are subject to the
same rules, which also apply between modulators.
n To check for interference caused by the modulator, switch off the modulator at
the front panel.
n To check for interference caused by an off-air signal to the modulator, unplug
or switch off the antenna feed.
Information on UK TV transmitter channel numbers can be found at the following
Web URL:
http://www.bbc.co.uk/reception/tv_transmitters/
(Information subject to change)
Technical data
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1. Tolerances given in the ITU-R Recommendation are not applicable.
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SCART connector pin connections
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19
Page 3
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