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94 posts

Master Geek

# 22311 23-May-2008 15:08
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I am trying to get digital going via my HVR-900 and dvbviewer.  I can't find any channels.  The house is very old and has this set up.This is the UHF aerial, with a 'Kingray' box on it.  It is VERY high up, so I can't get a close look.


The coax comes down to this box.


It is joined by the cable from the UHF antenna (sky), which points at Remuera.  I have no line of sight to Waiatarua.


A single coax leads from this into my house where I can get analogue signal fine (TV123 and C4), but nothing else.
My questions are

Is this some sort of 'joiner'?  It says inside '22V' but it has no power into it.  The brand is Kingray again.  Does it need power?

all input gratefully accepted.


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104 posts

Master Geek

  # 132819 23-May-2008 15:52
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it's a diplexer for joining UHF and VHF

104 posts

Master Geek

  # 132821 23-May-2008 15:54
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oh and it doesn't require power


6964 posts

Uber Geek


  # 132838 23-May-2008 16:53
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Ummm, looking at it from a distance I would say it does have an amplifier, does it have a product code, I suspect it could be a MHU24G which has no amp in the VHF leg but a 14-24dB adjustable gain amp in the UHF path. you will require an injector at the wall plate to pump either 14VDC or 15-22VAC up to it to make the amp work. Without it powered it will act as a big attenuator.

You really need to identify the model number.

If it were me, I would dump the diplexer, run a new cable from your UHF antenna to your HVR900 and see if it works without the amp. For DVB-T you really need to dump these old saddle and clamp diplexers etc and go for clean RG6 runs.


22515 posts

Uber Geek


  # 132847 23-May-2008 18:00
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It is an amplifier - you will need to find a power injector from somewhere, or replace it with a standard diplexer, or run another cable. Often people take the power injector when moving house. They are available from antenna suppliers on their own. You may also need a male to male and female to female adaptor depending on the plugs and sockets that you already have.


94 posts

Master Geek

  # 132936 24-May-2008 07:51
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Its an MHU20. Multiple google searches have failed to find that product, though there is an mhu24. Ill try and get a power injector and see what happens.

Thanks for the input.


929 posts

Ultimate Geek

  # 132938 24-May-2008 08:26
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You will need a KINGRAY PSK02 power supply they are easy to get. Try your local JA Russell electrical branch or any good aerial shop.

94 posts

Master Geek

  # 132946 24-May-2008 09:11
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Thanks for the advice, ive ordered one today.  Roll on digital!!


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