MGB & GT Forum
PURE Highway and power antenna : how to connect?
Posted by rosko
Topic Creator (OP)
Dec 9, 2016 11:25 AM
Joined 11 years ago
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I have bought a Pure Highway H270SB car stereo for my 1974 MGB roadster and would like to connect it to a Hirschmann AUTA 2050 so that the antenna extends/retracts when I switch the radio on/off.
Looking for the right connector I asked Pure but they were of no help. Their reply was "The Highway has been made in partnership with the car and audio retailer Halfords, and while we can assist with the operation of the unit I'm afraid we really cannot advise you on the installation as we are not trained in this field. As such we would always suggest speaking to a professional installer for confirmation and clarification on matters related to this area." I asked Haklfords but the lady on the "Chat" line could not help, as expected. Since I do not live in the UK, there is no one to put the question to.
I asked Hirschmann and, based on the Pure instructions manual, they suggested that Pin A5 could be the right one (see illustration below).
Can anyone help? Thanks a lot.
Looking for the right connector I asked Pure but they were of no help. Their reply was "The Highway has been made in partnership with the car and audio retailer Halfords, and while we can assist with the operation of the unit I'm afraid we really cannot advise you on the installation as we are not trained in this field. As such we would always suggest speaking to a professional installer for confirmation and clarification on matters related to this area." I asked Haklfords but the lady on the "Chat" line could not help, as expected. Since I do not live in the UK, there is no one to put the question to.
I asked Hirschmann and, based on the Pure instructions manual, they suggested that Pin A5 could be the right one (see illustration below).
Can anyone help? Thanks a lot.
late 64
Terry O
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Dec 9, 2016 12:02 PM
Joined 7 years ago
436 Posts
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by the looks of the pinout schematic you do not have a dedicated output for the antenna........ what you need is a 12v source that will be off when radio is off and on when turned on........ you will have to hook the radio up and try the "A5" pin out and see if indeed this goes off radio is off. you will also need to put a relay in between this point and the antenna as the radio will not be able to support the power to turn the antenna on/off as it will draw more current than most radios can handle..... do this on a bench out of the car to be sure you have it hooked up correct before putting into your car... makes it easier.,
Topic Creator (OP)
Dec 9, 2016 12:14 PM
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Dec 9, 2016 01:31 PM
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I agree that A5 is the pin you need. It is designed to power a remote amp, such that when the radio is off so is the amp, just what you need for your antenna.
I don't think that you need a relay, the wire sends a signal to the antenna, which has a separate power feed, otherwise when you turn the radio off nothing would happen, i.e. the antenna stays up. no power to lower it. A remote amp may need a relay, or it might be built in.
Herb
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I don't think that you need a relay, the wire sends a signal to the antenna, which has a separate power feed, otherwise when you turn the radio off nothing would happen, i.e. the antenna stays up. no power to lower it. A remote amp may need a relay, or it might be built in.
Herb
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tvrgeek
Scott S
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Dec 9, 2016 01:56 PM
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MG Dog
Gerald Klida
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Dec 9, 2016 02:05 PM
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Dec 9, 2016 02:51 PM
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As Herb suggests, power antennas usually require their own power, and AMP (A5) connector from the head unit is merely a control to select whether the antenna is to be up (on) or down (off). The antenna will have a separate ground and 12V connection that goes back to the battery. The same is the true for power amps, where the AMP wire controls whether the amp is turned on or off, while the Amps main power comes directly from the battery. So long as the AMP line is only used in this manner, it should not need a relay.
tvrgeek
Scott S
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Dec 9, 2016 03:43 PM
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Dec 9, 2016 05:33 PM
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Dec 9, 2016 09:33 PM
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Topic Creator (OP)
Dec 10, 2016 07:54 AM
Joined 11 years ago
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Thanks all for your input.
Actually the antenna has a separate power connection and the purpose of the link between the antenna and the radio is only to raise/lower the antenna.
So I think that connecting the green control cable (marked "gn" in Figure 3 of the diagram) to A5 should extend/retract the antenna. If it does not work I can still follow Bruce's advise.
Here is the antenna diagram.
Actually the antenna has a separate power connection and the purpose of the link between the antenna and the radio is only to raise/lower the antenna.
So I think that connecting the green control cable (marked "gn" in Figure 3 of the diagram) to A5 should extend/retract the antenna. If it does not work I can still follow Bruce's advise.
Here is the antenna diagram.
Attachments:
grahamts
Graham Prosser
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Dec 10, 2016 12:07 PM
Joined 14 years ago
196 Posts
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You just need a standard ISO car radio connector (ISO 10487) to connect the "Pure" radio to your car harness. You can get them from any car parts shop or off EBay, you will want one with flying lead connections that you can join to your harness with either crimp connectors or twist, solder and sleeve connections.
Graham
Graham
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Dec 10, 2016 01:44 PM
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Dec 11, 2016 01:26 PM
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FWIW the iso pinout shows that A5 is the antenna control.
Herb
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Herb
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about 1 month and 1 week later...
Topic Creator (OP)
Jan 18, 2017 03:32 PM
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Feedback on this : I bought the ISO connectors suggested by Graham.
A5 is used to control the antenna.
A4 and A7 are connected together to the battery (otherwise the car radio does not turn on).
A8 is connected to the ground.
And everything works flawlessly!
A5 is used to control the antenna.
A4 and A7 are connected together to the battery (otherwise the car radio does not turn on).
A8 is connected to the ground.
And everything works flawlessly!
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