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Author Topic: RHW and aerial  (Read 1774 times)

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megaomega123

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RHW and aerial
« on: 09 November 2009, 17:28:24 »
Managed to get a good look and test everything now. RHW still not working. I got to the amplifier from under the parcel shelf and when I switched on the RHW the casing of the amplifier was putting out 12v. I had 12v at each side of the RHW.
Does the amplifier also regulate the current to the RHW? I have now bypassed the amplifier and got rid but still no RHW, is this because I have taken away the regulation? Aerial is not an issue now as I have changed it and rerouted it, now perfect.
Fuse is ok and heated mirrors working too  :-?
« Last Edit: 09 November 2009, 17:29:47 by phate321 »
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Re: RHW and aerial
« Reply #1 on: 09 November 2009, 17:45:55 »
hrw unrelated to radio amp (other than they use same elements)  :-/
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Andy H

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Re: RHW and aerial
« Reply #2 on: 09 November 2009, 17:49:36 »
How should the heated rear window be earthed?

Is it through the body of the aerial amplifier? (that I presume was bolted to a solid piece of the car body)
« Last Edit: 09 November 2009, 17:49:58 by andyh »
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megaomega123

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Re: RHW and aerial
« Reply #3 on: 09 November 2009, 17:51:25 »
mmmm There is a live going to the amp then 2 from the amp going the either side of the window and only 1 aerial connection which I don't know if it is in or out. If t is an aerial amplifier I would expect the aerial to "pass through" it! I have become very confused by it all. I have wired the rhw every way possible and nothing. All I have is a live feed and 2 wires of the same grade coming from either side of the window.
I am stumped lol
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Andy H

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Re: RHW and aerial
« Reply #4 on: 09 November 2009, 17:53:38 »
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hrw unrelated to radio amp (other than they use same elements)  :-/
I don't agree. The aerial amp needs to act as a high pass filter so that 12v DC can flow through the heater element while at the same time a VHF radio signal is being received by the element and passed on to the radio receiver.
« Last Edit: 09 November 2009, 17:54:17 by andyh »
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megaomega123

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Re: RHW and aerial
« Reply #5 on: 09 November 2009, 17:57:40 »
Quote
Quote
hrw unrelated to radio amp (other than they use same elements)  :-/
I don't agree. The aerial amp needs to act as a high pass filter so that 12v DC can flow through the heater element while at the same time a VHF radio signal is being received by the element and passed on to the radio receiver.
So the amplifier is essential for the rhw to function?
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Andy H

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Re: RHW and aerial
« Reply #6 on: 09 November 2009, 18:04:21 »
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So the amplifier is essential for the rhw to function?
No not really.

If you have a normal aerial (and don't want to use the rear heater element as an aerial) you should be able to wire the 12v feed from the HRW relay to one side of the HRW and ground the other.

Be careful if the feed from the back of the radio is also present because that won't like being connected directly to the HRW.
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megaomega123

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Re: RHW and aerial
« Reply #7 on: 09 November 2009, 18:08:58 »
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Quote
So the amplifier is essential for the rhw to function?
No not really.

If you have a normal aerial (and don't want to use the rear heater element as an aerial) you should be able to wire the 12v feed from the HRW relay to one side of the HRW and ground the other.

Be careful if the feed from the back of the radio is also present because that won't like being connected directly to the HRW.
I think I was only getting about 2v from the feed off the radio, I think I worked out that it is for the MID as when I "miswired" it went off ha. I presume it doesn't matter which side of the window gets live or earthed?
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Andy H

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Re: RHW and aerial
« Reply #8 on: 09 November 2009, 18:33:07 »
Was the amplifier bolted to the metal parcel shelf? (or did it look as though it should have been?)

Before ripping out the standard equipment I would be inclined to check that the original earth connection was sound. Simply bolting the amplifier solidly to the metal parcel shelf might make everything work properly (including the aerial part of it).

CAVEAT I don't know whether it should be earthed through the body of the amplifier or via a wire in the wiring loom.

If there is an earth wire in the wiring loom then you don't want to apply 12v to that side of the HRW....
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Andy H

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Re: RHW and aerial
« Reply #9 on: 09 November 2009, 18:36:20 »
Quote
I think I was only getting about 2v from the feed off the radio,
If you can find out what is causing this you will probably find the root cause of the poor radio reception.
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megaomega123

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Re: RHW and aerial
« Reply #10 on: 09 November 2009, 18:43:10 »
I have to confess to approaching this arse about face. After all the work at the back of the car, I discovered today that I had a very poor connection at the back of the radio  :-[ :-[
The standard aerial lead is unbelievably fragile on the inner core. Yes the earth for the amp is supplied by it being bolted to the car under the parcel shelf. I think I will put it back in place and put the rhw as it was minus the aerial connection as that has been taken care of.

Thanks
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megaomega123

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Re: RHW and aerial
« Reply #11 on: 10 November 2009, 17:25:17 »
I can now confirm that the amplifier under the parcel shelf is required for the rhw to work. I have wired it all back together and put it back in it's original location, for the earth connection, everything is working as it should. I replaced the aerial with a glass mount, 12v amplified one and it is working very well. I have mounted this under drivers sun visor so as to shorten the distance of the aerial and 12v supply leads.
Thanks for help all  :y
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