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SC-816 Head Unit Antenna Question Topic is solved

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1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
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1997 - 2000 V70, V70 AWD
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Eddystone
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SC-816 Head Unit Antenna Question  Topic is solved

Post by Eddystone » Tue Jun 18, 2019 7:33 pm

I am looking at installing an aftermarket replacement for the SC-816 in my 1998 V70.

There are two antenna inputs on the SC-816 and two antenna leads. One is standard size. The other is slightly smaller than standard. I gather that the car has two separate antennas (antennae).

Is there an easy way to connect these two antenna leads with a Y-cable?

If not, will the single standard-sized large antenna lead give decent reception with a modern head unit?


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Re: SC-816 Head Unit Antenna Question

Post by BEJinFbk » Wed Jun 19, 2019 1:44 am

Both of the antennas in the rear side glass use power amps.
Since your new unit probably doesn’t support dual antenna
diversity tuning like the Alpine/OEM unit, the big one will do.

Just make sure that you connect the power antenna connection
from the adapter harness to the mating output on the new HU.
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Re: SC-816 Head Unit Antenna Question

Post by Eddystone » Thu Jun 20, 2019 11:42 am

Thanks. I figured that was the case.

I don't listen to the radio much, anyway. I might see if I can make up a Y-connector from a standard antenna Y-connector. I gather that in my V70 there is one antenna in the back and another in the front. I don't know if that will mess up the antenna impedance, but whatever I make will just be a plug/unplug affair. If the one antenna works okay, that will probably be how it stays.

As an aside, my research says this is a Mitsubishi device.


1998 V70 Non-Turbo/Auto
1993 945 Turbo/Auto
1999 S70 T5 Turbo/Auto
All U.S. market models.
All on the road and running.
PM me if you are near Philadelphia.
;-)

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Re: SC-816 Head Unit Antenna Question

Post by BEJinFbk » Thu Jun 20, 2019 11:55 am

Both are printed on the side glass. IIRC, primary on the
driver’s ( big ) and secondary on the passengers. Again,
just be sure that the RF amps are getting juice.

And the SC’s were all produced by Alpine. 👍


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Re:1998 SC-816 Head Unit Antenna Question (stereo, radio)

Post by Eddystone » Mon Jun 24, 2019 11:02 am

To use BOTH factory Volvo diversity antennas with an aftermarket stereo head unit with only one standard Motorola-type antenna input, you can buy these two items from Amazon or another source (or equivalent pieces from elsewhere:

Metra 40-UV43 Male to Female Motorola Antenna Cable
Metra 40-GM10 GM Antenna Adapter

The first item is a Y-adapter with two female inputs and a single male output that plugs into your aftermarket head unit. You plug the large factory antenna into one of the female inputs. You plug the second (smaller) factory antenna into the GM antenna adapter and then plug the other end of the adapter into the second female input of the Y-adapter. Plug the male end of the Y-adapter into your aftermarket radio.

What effect this has on antenna impedance matching or anything else will be up to some ham radio operator or graduate engineer to figure out. All I can say is that I now have antenna input from BOTH back window antennas on my 1998 V70 instead of just one. Reception for FM seems excellent. The head unit I installed does not have an AM receiver.


1998 V70 Non-Turbo/Auto
1993 945 Turbo/Auto
1999 S70 T5 Turbo/Auto
All U.S. market models.
All on the road and running.
PM me if you are near Philadelphia.
;-)

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