All,
My '91 with the aformentioned radio and a new antenna is unable to find any radio stations in South Florida with enough strength to broadcast. My other car has no issues. Any help would be welcome.
Blaupunkt Arizona poor radio performance
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dr bob
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Just reread your post way late, and have a partial response that may or may not help you at this point.
First, I offer a reminder that the stubby roof antenna from mid-production S4/GT and beyond has an RF amplifier between the antenna and the radio itself. Power for that amplifier is fed by the aux power lead on the radio itself, so on and off with the head unit. From feeble memory it's via the blue wire from the radio itself in my upgraded Blau Alaska replacement head unit, if that helps. That wire often gets repurposed/connected to aftermarket audio amplifier turn-on circuits, and that affects the radio performance when the RF amplifier is disconnected. Then virtually no antenna and no signal gates through.
The RF lead from antenna MUST plug into that RF amplifier first, and not directly into the head unit itself. The RF amplifier is only shown on the wiring diagram, not in any physical descriptions. Without doing a bunch of searching, I'm thinking it's located in the dash above the glove box, but it may also be in the roof above the headliner. My instinct would be to use a tracer tool to inject a tone in the RF amplifier power lead at the head-unit end, and go hunt down the other end with the receiver part of the tracer tool.
FWIW, that same market-insensitive current flow diagram shows the RF amp power exiting the factory radio frame via a pin 4 and a white wire. I replaced my original "Reno" radio/cassette unit with an "Alaska" with a different connector pinout. I have the docs for the Alaska, and they offer pin ID's for the rear connector plugs but no wire colors.
Sorry I can't be of more assistance. I did the sound system upgrade in my car within a couple years of purchase, so it's been a LONG while. My support package for the car's log shows the work and all the wiring and connections added, but I made no actual changes to the antenna and amplifier circuits so nothing is detailed in my notes.
First, I offer a reminder that the stubby roof antenna from mid-production S4/GT and beyond has an RF amplifier between the antenna and the radio itself. Power for that amplifier is fed by the aux power lead on the radio itself, so on and off with the head unit. From feeble memory it's via the blue wire from the radio itself in my upgraded Blau Alaska replacement head unit, if that helps. That wire often gets repurposed/connected to aftermarket audio amplifier turn-on circuits, and that affects the radio performance when the RF amplifier is disconnected. Then virtually no antenna and no signal gates through.
The RF lead from antenna MUST plug into that RF amplifier first, and not directly into the head unit itself. The RF amplifier is only shown on the wiring diagram, not in any physical descriptions. Without doing a bunch of searching, I'm thinking it's located in the dash above the glove box, but it may also be in the roof above the headliner. My instinct would be to use a tracer tool to inject a tone in the RF amplifier power lead at the head-unit end, and go hunt down the other end with the receiver part of the tracer tool.
FWIW, that same market-insensitive current flow diagram shows the RF amp power exiting the factory radio frame via a pin 4 and a white wire. I replaced my original "Reno" radio/cassette unit with an "Alaska" with a different connector pinout. I have the docs for the Alaska, and they offer pin ID's for the rear connector plugs but no wire colors.
Sorry I can't be of more assistance. I did the sound system upgrade in my car within a couple years of purchase, so it's been a LONG while. My support package for the car's log shows the work and all the wiring and connections added, but I made no actual changes to the antenna and amplifier circuits so nothing is detailed in my notes.
dr bob
1989 928 S4, black with cashmere/black inside
SoCal 928 Group Cofounder
928 Owner's Club Charter Member
Former Ex Bend Yacht Club Commodore Emeritus
Free Advice and Commentary. Use At Your Own Risk!
1989 928 S4, black with cashmere/black inside
SoCal 928 Group Cofounder
928 Owner's Club Charter Member
Former Ex Bend Yacht Club Commodore Emeritus
Free Advice and Commentary. Use At Your Own Risk!