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PURE Highway and power antenna : how to connect?

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rosko Avatar
rosko Luc Masuy
Namur, Namur, Belgium   BEL
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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.


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late 64 Avatar
late 64 Terry O
Milton, Ont, Canada   CAN
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1965 MG MGB MkI "Moggie"
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.,cool smiley

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rosko Avatar
rosko Luc Masuy
Namur, Namur, Belgium   BEL
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Thanks for the quick reply.

BTW what type of connector matches those pins?

If Pin 5 does not solve the problem, is there any other alternative?

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ozieagle Avatar
ozieagle Gold Member Herb Adler
Geelong Victoria, Australia   AUS
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1958 Wolseley 1500 "Wooly"
1966 MG MGB "Bl**dy B"
1995 Toyota Highlander "Hi Ace Van"
2022 MG ZS
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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tvrgeek Silver Member Scott S
Hillsborough, North Carolinia, USA   USA
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I would use the "amp remote" but I would use it to control a relay. It probably does not have the current to drive an antenna motor.



Cogito ergo sum periculoso

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MG Dog Gerald Klida
Saint Clair Shores, MI, USA   USA
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Delete



“What seems to be, Is,
To those to whom it seems to be...."
William Blake



Edited 1 time(s). Last edit at 2016-12-09 05:29 PM by MG Dog.

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rhankey Robin Hankey
Southern Pines, NC, USA   USA
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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.

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tvrgeek Silver Member Scott S
Hillsborough, North Carolinia, USA   USA
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Usually the antenna wire is blue.



Cogito ergo sum periculoso

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bencii Silver Member Ben Colpitts
Eden Prairie, MN, USA   USA
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1966 MG MGB
1973 MG MGB
That radio requires an active digital antenna, is it compatible with that antenna?

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Bruce Cunha Avatar
placerville, CA, USA   USA
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1950 MG TD
1967 MG MGB GT
Other option would be to wire the antenna separately and have a switch to raise and lower it.



Bruce E. Cunha

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rosko Avatar
rosko Luc Masuy
Namur, Namur, Belgium   BEL
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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.


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Antenna1.JPG

Antenna2.JPG    66 KB
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grahamts Avatar
grahamts Graham Prosser
Chelmsford, Essex, UK   GBR
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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


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rosko Avatar
rosko Luc Masuy
Namur, Namur, Belgium   BEL
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Thanks a million grahamts!

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ozieagle Gold Member Herb Adler
Geelong Victoria, Australia   AUS
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1958 Wolseley 1500 "Wooly"
1966 MG MGB "Bl**dy B"
1995 Toyota Highlander "Hi Ace Van"
2022 MG ZS
FWIW the iso pinout shows that A5 is the antenna control.

Herb



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about 1 month and 1 week later...
rosko Avatar
rosko Luc Masuy
Namur, Namur, Belgium   BEL
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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!

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