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Technical data
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Notes
1. This input is intended for connection of locally generated signals such as CCTV.
2. The UHF ANT input has a fixed upward gain slope of approx. 4 dB. Gain flatness figure allows for corresponding
downward cable slope.
3. Recommended preamplifiers: PROception types proMHD11L & proMHD11M. Not suitable for powering 12 V
preamplifiers.
Page 6
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UHF preamplifier power
A PROception masthead preamplifier can be used if necessary to obtain sufficient
TV signal level at the main UHF input. The headend amplifier will automatically
U
X
U
H
F
1
power a proMHD11L (9 dB gain) or proMHD11M (16 dB gain) preamplifier. The
7
0
. .
8
6
2
M
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z
line-power will automatically shut down if no preamplifier is used and the antenna
0
d
B
presents a DC short circuit.
t a
Any attenuator connected to the UHF antenna input should be of the DC-blocked
1
5 .
d
B
type (e.g. PROception type proATT20V). In special cases where the input line power
1
9
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is not required it can be completely disabled by means of an internal jumper link.
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Please contact Proception technical support for details of how to use this facility.
Using the auxiliary UHF input
This input is provided to allow simple connection of local TV sources such as a
security CCTV camera (via a suitable modulator). It is not recommended to use
this input for additional off-air sources unless separate input filtering is provided.
e v
) l
The launch level of any auxiliary analogue TV channels on the system should be
kept to the minimum necessary to obtain adequately noise-free pictures. Local
modulator channel(s) must of course be carefully chosen, avoiding N±1 and N±5
relationships with the main off-air channels.
The gain via this input is adequate for use with modulators having an output level
m
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l a
p
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v
d i
e
d
around 75 dBµV – e.g. the PROception proMOD1. Any external gain added ahead
of the AUX UHF input must be kept to an absolute minimum, otherwise the C/N
ratio of the main off-air UHF signals will be degraded.
Page 3
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