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DAB radio signal using the rear screen antennas #1636815
14/11/2019 19:17
14/11/2019 19:17
Joined: Feb 2006
Posts: 123
Newbury
MIB Offline OP
Club Member 1579
MIB  Offline OP
Club Member 1579
On a journey

Joined: Feb 2006
Posts: 123
Newbury
I've found that it is possible to use the existing rear screen antenna to feed a DAB / FM radio signal to a head unit.
I disconnected all of the wiring from the existing antenna amplifier (apart from the ground feed to and from the heated rear screen of course).
The 12v feed from the head unit was used to power the a new amplifier (A4721.01 about £50 from www.co-star.co.uk).
I also purchsed some FAKRA Female Water Blue connectors from the same place so that the input and output signals could be connected to the amplifier.
I connected both rear screen antenna wires together before feeding them into the amplifier.
I used the existing FM/AM cable and I already had another SMB co-ax cable in place for the DAB signal from an earlier failed attempt using an E-bay amplifier that proved to be rubbish!
My head unit is a Pure Highway H260DBi and I'm getting 4 out of 4 bars DAB signal strength on many stations smile

Attached Files
Radio amplifier 4721_01.jpg (82 downloads)
4721.01

[Linked Image]
Bog standard!
Re: DAB radio signal using the rear screen antennas [Re: MIB] #1637356
06/12/2019 12:35
06/12/2019 12:35
Joined: Sep 2007
Posts: 603
Freedom
Master_Mariner Offline
Club member 583
Master_Mariner  Offline
Club member 583
Enjoying the ride

Joined: Sep 2007
Posts: 603
Freedom
Hats off to you,

That's a commitment to listening to "tunes" while your at the wheel. And looks to be a very good upgrade.

I'm still on the original stereo...now where are my mix tapes :-)

Regards

MM

Re: DAB radio signal using the rear screen antennas [Re: MIB] #1637360
06/12/2019 14:28
06/12/2019 14:28
Joined: Mar 2007
Posts: 11,087
Auld Reekie
Edinburgh Offline
Club Board member
Edinburgh  Offline
Club Board member
I AM a Coop

Joined: Mar 2007
Posts: 11,087
Auld Reekie
This is a very tempting mod - the internal aerials work up to a point but I haven't found them ultra-reliable


Thanks again, Photobucket.
BumbleBee under restoration, in paintshop!...
Re: DAB radio signal using the rear screen antennas [Re: MIB] #1637370
06/12/2019 15:50
06/12/2019 15:50
Joined: Dec 2005
Posts: 7,333
Lightwater, Surrey, UK
DaveG Online content
Club Member 311
DaveG  Online Content
Club Member 311
Forum is my life

Joined: Dec 2005
Posts: 7,333
Lightwater, Surrey, UK
Agreed, I've been looking at it too, here's a link to the suggested amplifier https://www.co-star.co.uk/3669/dab-in-car-digital-radio-amplifier-a-4721-01/

I can't quite work out the wiring arrangement that is referred to however, perhaps MIB can give us a nice diagram? In particular, is there a DAB aerial anywhere? I was thinking of something like this https://www.co-star.co.uk/3839/dab-glass-mount-antenna-gmdab3l-5f/


1996 Portofino 20vt & 2000 Pearl White Plus
1985½ & 2016 2017 Fiat 124 Spider + XF Sportbrake
Re: DAB radio signal using the rear screen antennas [Re: MIB] #1637986
06/01/2020 17:59
06/01/2020 17:59
Joined: Feb 2006
Posts: 123
Newbury
MIB Offline OP
Club Member 1579
MIB  Offline OP
Club Member 1579
On a journey

Joined: Feb 2006
Posts: 123
Newbury
Part of the reason for this mod is that I didn't want to use one of those ugly stick on DAB antennas smile
The heated screen elements are all the antennas needed. In fact DAB signals are horizontally polarised, so the rear screen antenna is ideal!
The reason that an amplifier was used in the first place is to boost the FM/AM signals, which are transmitted by vertical antennas, to make up for the inherent losses when trying to receive a signal with a cross polarised receive antenna.

If I was to do this mod from scratch, I would do the following:

For the AM/FM signal output from the new amplifier to the radio Google 'Female FAKRA to Male Din 5m cable'.

For the DAB signal output from the new amplifier to the radio Google 'Female FAKRA to SMB 5m cable'.

Run these two cables from the new amplifier down the nearside of the car behind the left rear speaker, under the carpet by the passenger door and over the footwell to the radio.

Google 'Female FAKRA cable repair kit'. This is FAKRA connector to a flying coax lead.
Solder the centre wire of this coax (make sure to not connect the coax outer screen to anything) to the ends of cables 2 and 3 in the attached picture. This connects together the two AM and FM antennas built into the rear screen and their received signals are now used as the input to the new radio amplifier.

I think that this is a far better way to do it than my bit of a bodge up!

Attached Files
Last edited by MIB; 06/01/2020 18:00.

[Linked Image]
Bog standard!

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