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MASTHEAD AMPLIFIERS

Q & A
Q:Why would the picture be worse after installing the masthead amplifier?
A1:. Is there more than one outlet? Check the splitter box. The power supply must be connected to the coaxial leg that feeds the AC/DC leg of the splitter box, to pass power to the head unit.
A2: Check that there is no earth cable touching the centre conductor of the coaxial cable. This will cause a short circuit and shut down the power supply. Once the short circuit is removed the amplifier will continue to work unaffected.
A3: Check the coaxial outlet socket is not isolated i.e. won’t pass power.
Q: Why is there is a white line slowly moving up the screen?
A1: This can be caused by a number of reasons but is usually due to poor mains isolation. Trying a DC power supply will generally fix the problem.
 

Feature
All separate VHF/UHF gain controls, filters/traps and voltage selections are marked on the masthead boards for easy identification.
 

Explanation
Positive tilt has been incorporated into Kingray mastheads to attenuate lower frequencies and help provide for unbalanced levels off the antenna, especially 44-140MHz, or after a long cable run.
 
This masthead provides a separate input for VHF and UHF only, with no VHF/UHF combined antenna input. The UHF input (520-860MHz) has an adjustable flat gain of 14-24dB. The VHF input (44-230MHz) is passively diplexed with an insertion loss not greater than 1dB. The supply voltage is 17.5VAC or 14VDC. [40mA]
Packaging Options: G+P, GP
 

This unit provides multiple powering options of 17.5 or 22VAC or 14VDC [75mA] via the use of a switchable link. A similar switchable link has been employed to give the option of passing power to a separate VHF masthead if required. The UHF input (520-860MHz) has an adjustable flat gain of 24-34dB. The VHF input (44-230MHz) is passively diplexed with an insertion loss not greater than 1dB. Combined or separate VHF/UHF antennas may be used.
Packaging Options: G+P, GP
 
Tip: If VHF and UHF signals are being amplified down a long line of coax cable, the MHU34G can be utilised in conjunction with the MHW34GIL to help balance uneven signal levels.
 
Extra stability is provided in both these units for a high output and a low noise figure, due to the use of power regulators. The MHU44G amplifies 520-860MHz from 34-44dB whilst diplexing 44-230MHz. The MHU44B5G provides superior filtering and isolation between band 4 and 5, by amplifying band 5 UHF only 600-820MHz from 34-44dB and diplexing 44-554MHz. Both models employ mid stage gain controls, an optional power pass link on the VHF input and shielding to enhance the high output stages. The supply voltage is 17.5VAC or 14VDC. [90mA]
Packaging Options: G or GP
 
 
Provides fixed flat gain of 38dB from 44-230MHz. The UHF frequencies 520-860MHz can be diplexed with an insertion loss not greater than 1dB. This unit also provides an option of a 300ž input for VHF. The supply voltage is 17.5VAC or 14VDC. [55mA]
Packaging: G+P only
 
A rather unique masthead amplifier; a cross between our previous models MH25HL and MHV34HB. The product employs high adjustable gain in the VHF band 175-230MHz of 26-44dB. The VLF band 44-144MHz can be bypassed or diplexed depending on the antenna requirements and the UHF band 520-860MHz provides an adjustable gain level of 0-10dB. The MHV44HLG is primarily designed for fringe metro areas or regional areas looking to achieve capital city programmes whilst utilising the regional UHF translator for local content. This unit has a very low noise figure and will be ideal for regional areas when digital transmission commences in metro areas. The supply voltage is 17.5VAC or 14VDC. [80mA]
Packaging: G+P only
 

MHU24G

 

MHU34G

 

MHU44G

 

MHV34

 


MHV44HLG

 

SOLAR PANELS NOW AVAILABLE Ideal for remote retransmitter sites.

Contact GME Kingray for further details.