Maxview MHA12CD/S, MHA23CD/S Instruction Manual

MHA23CD/S

1 x Group C/D

680-860

23dB

3dB

108dBµV
103dBµV
102dBµV

10dB
10dB

1

35mA

Available

‘F’ connector

Yes

MHA12CD/S

1 x Group C/D

680-860

12dB

2.7dB

112dBµV
107dBµV
106dBµV

10dB
10dB

1

20mA

No

‘F’ connector

Yes

Model

Inputs
Bandwidth (MHz)
Gain
Noise Figure
Max O/P -46dB Cross Mod
2 TV Channels
4 TV Channels
5 TV Channels
Input RLR (75ohm)
Output RLR (75ohm)
No. of Outputs
12V Power Requirement
Through Line Powering
R.F. Connector Type
Fully Screened

Introduction

The Maxview medium and high gain group C/D ‘Precision’ masthead amplifiers feature low noise figures and
are designed to improve signal performance in weak UHF TV group C/D signal areas. The input filtering
provides good rejection of out of group TV signals. They are suitable for mast fixing with the releasable cable
tie provided or for wall fixing using the drill out tabs. The ‘Precision’ masthead amplifiers are fully screened and
suitable for use in either professional MATV or domestic systems. The amplifiers are designed for indoor or
outdoor use, and for mounting close to the antenna, requiring +12V d.c. line powering from either the MHP1,
MHP2 or MHPL1 power supply units.

The medium gain MHA12CD/S provides excellent performance in smaller systems utilising relatively short
cable runs (approx. <15m). The high gain MHA23CD/S Group C/D amplifier is ideally suited for either small or
larger systems where longer cable runs may be employed. The MHA23CD/S caters for extremely weak
signals and/or long cable run installations and is provided with a cascade line power option.

Maxview reserve the right to alter their designs or specifications without prior notice.

The figures quoted are typical and are subject to normal production tolerances.

Performance Specifications

Typical Applications

User Instructions - Fully Screened Medium and High

Gain Group C/D ‘Precision’ Masthead Amplifier Range

MHA12CD/S MHA23CD/S

GROUP C/D UHF AERIAL

MHA12CD/S

AE

MHP
PSU

+12V d.c. LINE POWER

AMPLIFIED GROUPC/D

UHF TV SIGNALS

TV

TV

PLATE

230V MAINS INPUT

Single UHF Amplifier Application
For Weak Group CD Signal Areas

GROUP C/D UHF AERIAL

MHA12CD/S

AE

MHP
PSU

+12V d.c. LINE POWER

LINE POWER

AMPLIFIED GROUPC/D

UHF TV SIGNALS

TV

TV

PLATE

230V MAINS INPUT

Single UHF Amplifier Application
For Very Weak Group CD Signal Areas

MHA23CD/S

9111099 Iss 3

1. Installation Recommendations

1.1 For optimum performance and to provide the best interference free reception we recommend that these guidelines are followed
when installing your masthead amplifier.

● Mount the masthead/aerial combination as high as possible with a clear line of sight towards the transmitter.

● Always use a good quality screened coaxial cable, such as cable conforming to BS5425:Part 1:1986 for the installation.

● Fit the masthead amplifier no closer than 50cm and no more than 1m from the associated aerial. Ensure that the distance between

two UHF TV aerials on a mast is at least 60cm-65cm.

● In order to minimise potential pick up, install the masthead/aerial combination and coaxial downlead away from overhead signal,

telephone and power cables.

2. Mounting Details

2.1 Undo the snap lock latches either side of the masthead outer housing and hinge the lid open.

2.2 Remove the inner diecast housing.

2.3 If fixing to a mast use the releasable cable tie provided. If fixing to a flat surface, locate drill-out tabs and remove the required tabs

on the inside wall of the outer housing and screw through these specially prepared areas.

2.4 Route the cables to the masthead housing. We recommend DS81, DS100 good quality screened coaxial cable with mating ‘F’
connector to suit. Prepare the cable and attach ‘F’ connectors (integral ‘O’ ring recommended) to the end of the cables. Screw the
cables securely to the correct input and output connections on the bottom of the inner diecast housing.

2.5 Replace the inner diecast housing into the outer housing ensuring the cables are positioned in the cable guides. Close the plastic
lid and seal by fastening the snap lock latches. Fix the cable to the mast by using tape to hold all cables securely in position.

3. Cascade Line Powering

3.1 This is provided as standard on the group C/D UHF antenna input of the MHA23CD/S to cater for extremely weak UHF TV
signals and/or long cable run installations. When cascading amplifiers we recommend that the masthead amplifiers be cascaded
either with a screened masthead amplifier or a screened signal booster (located indoors). Ensure that there is a minimum of approx.
10-15m of cable between amplifiers connected in cascade.

3.2 If through line powering is required, peel back, but do not remove, the silver EMC tape on the left hand side of the inner diecast
housing. Insert the line power link (PL1) through the guide slot and into (SK1) and make sure it is pushed fully home. Re-seal the
tape across the hole. If the line power link needs to be removed, use long nose pliers to carefully remove it from the guide slot.

4. Power supply

4.1 The MHP1 (single output) and MHP2 (twin output) plug-in power supply units or the fully screened MHPL1 single output power
supply unit can be used with a single amplifier or multiple amplifier installations where up to 2 amplifiers may be required. The MHP2
incorporates signal splitting to provide an additional wideband TV output. Connect the +12V line power output of the MHP unit to the
TV/MHP terminal on the masthead amplifier.

4.2 Ensure that all installation work is completed before plugging in and switching on the associated power supply unit.

Many other installation possibilities exist for masthead amplifiers. Should you have any questions or require any assistance with
system planning please contact the Maxview Customer Helpline on 01553 811000.

9

111099 Iss 3

Snap lock latches

Cable guides

Fully
screened
diecast inner
housing

Fully weatherproof
outer housing

Type ‘F’ RF
connectors

Drill-out tabs (wall mounting only)

Line power guide slot

EMC tape

Model used for

illustration purposes only

Line power link

(PL1)

MAXVIEW LTD.COMMON LANE .SETCHEY.KING’S LYNN.NORFOLK.PE33 0AT.ENGLAND

CUSTOMER HELPLINE [phone] FAX [phone] e-mail: [e-mail] website: www.maxview.ltd.uk