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Corvette
C4 Forum
1988 Convertible for sunny day drives
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<blockquote data-quote="Tourmax" data-source="post: 173010" data-attributes="member: 5304"><p>Well, the new stereo has been a major PITA, but I’ve finally figured it out.</p><p></p><p>The problem was it would not hold it’s memory once shut down. Clock, user settings, radio staions...all of it wiped out after shutdown.</p><p></p><p>Making it even more confusing was the fact that if I hooked it up on the workbench, it worked fine and kept its memory. But once in the car, poof! Lost it’s settings every time the key was turned off.</p><p></p><p>I went through the trouble (and expense) of installing a 4 gauge power wire and a 4 gauge ground wire, figuring perhaps there was something in the car’s circuitry that was messing with the radio. Wouldn’t be the first time GM wiring has given me trouble becuase they decided to do something “proprietary”. At least there was already a 4 gauge sized hole in the firewall right behind the battery so I didn’t have to drill one. Just needed a small hole “poked” in the firewall inside insulation and the 4 gauge shoved through.</p><p></p><p>I chased the problem for a couple days until I hit upon the issue.</p><p></p><p>What it turned out to be was the power antenna. Yep, you read that right: the radio was “farking up” because of the power antenna.</p><p></p><p>Seems every time I turned the key off and the radio antenna wire signaled the antenna to retract, there was a back voltage (or a “spike” ) back up the antenna wire. This was freaking the radio out and it would drop all its settings. I’m actually probably lucky the radio isn’t totally fried.</p><p></p><p>What lead me to it is one time when I turned the key off, the door speaker made a “pop” as the radio shut down. That told me the radio wasn’t the last thing to shut down, like when you get a speaker “thump” if the amp isn’t shut down before you power off it’s audio source.</p><p></p><p>So now I have to make a relay network to isolate the radio from the antenna. The radio will just trigger the relay and the relay will supply B+ to extend/retract the antenna. The relay will take the “bump” and the radio should be fine.</p><p></p><p>One of the many hazards of “made in china” products. Had the antenna circuit in the radio been properly designed, it woukd have been built with a filter or “rejection circuit” to deal with any voltage issues.</p><p></p><p>So, turns out I will have spent almost as much as I would have for something like a pioneer touchscreen radio.</p><p></p><p>Oh well, at least now the power supply is built to handle the amps when I get to installing them. Also, having the radio “isolated” from the car wiring means no chance of ground loop interference problems, which is a nice plus on a fiberglass car!</p><p></p><p><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="Tourmax, post: 173010, member: 5304"] Well, the new stereo has been a major PITA, but I’ve finally figured it out. The problem was it would not hold it’s memory once shut down. Clock, user settings, radio staions...all of it wiped out after shutdown. Making it even more confusing was the fact that if I hooked it up on the workbench, it worked fine and kept its memory. But once in the car, poof! Lost it’s settings every time the key was turned off. I went through the trouble (and expense) of installing a 4 gauge power wire and a 4 gauge ground wire, figuring perhaps there was something in the car’s circuitry that was messing with the radio. Wouldn’t be the first time GM wiring has given me trouble becuase they decided to do something “proprietary”. At least there was already a 4 gauge sized hole in the firewall right behind the battery so I didn’t have to drill one. Just needed a small hole “poked” in the firewall inside insulation and the 4 gauge shoved through. I chased the problem for a couple days until I hit upon the issue. What it turned out to be was the power antenna. Yep, you read that right: the radio was “farking up” because of the power antenna. Seems every time I turned the key off and the radio antenna wire signaled the antenna to retract, there was a back voltage (or a “spike” ) back up the antenna wire. This was freaking the radio out and it would drop all its settings. I’m actually probably lucky the radio isn’t totally fried. What lead me to it is one time when I turned the key off, the door speaker made a “pop” as the radio shut down. That told me the radio wasn’t the last thing to shut down, like when you get a speaker “thump” if the amp isn’t shut down before you power off it’s audio source. So now I have to make a relay network to isolate the radio from the antenna. The radio will just trigger the relay and the relay will supply B+ to extend/retract the antenna. The relay will take the “bump” and the radio should be fine. One of the many hazards of “made in china” products. Had the antenna circuit in the radio been properly designed, it woukd have been built with a filter or “rejection circuit” to deal with any voltage issues. So, turns out I will have spent almost as much as I would have for something like a pioneer touchscreen radio. Oh well, at least now the power supply is built to handle the amps when I get to installing them. Also, having the radio “isolated” from the car wiring means no chance of ground loop interference problems, which is a nice plus on a fiberglass car! :) [/QUOTE]
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Corvette
C4 Forum
1988 Convertible for sunny day drives
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