Page 3Page 2
Mains power supply
The modulator is supplied with a fitted mains plug and may be plugged directly into
a 13 A (BS 1363) soc et outlet. If soc et outlets of a different type are in use, please
refer to the safety instructions on page 4. The mains plug should remain readily
accessible to permit disconnection of the unit from the supply.
Alternatively the plug may be cut off and the modulator wired into a readily accessible
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 ris 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. A readily accessible 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) and, where relevant, Part P of the building regulations.
The proMOD1 M 2 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.
System equipotential bonding
Distribution systems supplying signals to more than one household should comply
with the safety requirements of BS EN 60728-11. This effectively requires earthed
equipotential bonding of the system. (The use of isolated outlet plates is no longer
recommended since they compromise screening integrity and allow ingress of
interference.) Bonding may be effected using a proBAR5 equipotential bonding bar.
Setting the output channel number
The channel setting buttons on the front of the unit are normally loc ed 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 modulators output will need to have their appropriate channel settings retuned.
Notes on channel selection
Choice of an appropriate modulator channel setting is important to avoid interference
problems.
nThe 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 loo ing modulator picture.
nAlso avoid adjacent channels (N±1 relationship).
nAvoid any combination which results in signals spaced 5 channels apart (N±5
relationship).
nThe old avoid N±9 rule can usually be ignored, due to the improved image
rejection of modern TVs.
nAny other modulators in the same system (in VCRs, etc.) are subject to the same
rules, which also apply between modulators.
nTo chec for interference to other channels caused by the modulator, disconnect
the RF IN and RF OUT cables and lin them together using a bac -to-bac adapter.
nTo chec for interference caused by an off-air or other upstream system-generated
signal to the modulators output channel, unplug or disable the relevant input feed
to RF IN.
Information on UK TV transmitter channel numbers can be found at the following Web
URLs:
http://www.bbc.co.u /reception/transmitters/tv_trans/index.shtml
http://www.ofcom.org.u /static/reception_advice/index.asp.html
(Information subject to change)
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1. Tolerances given in the ITU-R Recommendation are not applicable.
2. The L & R inp ts are added to provide a mono signal for mod lation. (Q oted sensitivity applies
with both channels driven.)
Technical data
SCART connector pin connections (NC = no internal connection to pin.)
Fig.2 SCART connector
pin numbers
(view towards socket)
1
19
20
2
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1CN
2nioiduaR
3CN
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5dnuorG
6nioiduaL
7CN
8CN
9dnuorG
01CN
.onnipnoitcennoc
11CN
21CN
31dnuorG
41dnuorG
51CN
61CN
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81dnuorG
91CN
02)SBVC(nioediV
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