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post #1 of 26 (permalink) Old 01-21-2006, 04:50 PM Thread Starter
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ham radio/PA project

I have a cobra ham radio and PA that I want to put in my van. I want to put a loudspeaker on top of the van, on the front, as an outside PA. I also want the regular functional ham radio part. Does anybody know a site regarding this, and where to get the loudspeaker? Think like a political campaigning van that has the loudspeaker. If anybody's seen Black Sheep, the one Chris Farley has in the beginning....Thanks
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post #2 of 26 (permalink) Old 01-21-2006, 05:05 PM Thread Starter
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And whoops, I guess I should have said what my problem was. I'm not sure how to power it, there is a power outlet that I need to hook up to the battery somehow...
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post #3 of 26 (permalink) Old 01-21-2006, 07:04 PM Thread Starter
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Something like this, but I don't want to break the bank....

http://cgi.ebay.com/SPC-5P-5-12-Watt...QQcmdZViewItem
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post #4 of 26 (permalink) Old 01-21-2006, 08:26 PM
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Cobra CB Ham Radio? WtF? Unless its a Export, its not a ham radio.

Ham is outside the CB Spectrum. And it is unlawful to operate a Ham Radio @ Ham RF Power in the CB Frequencie Ranges.

But on the "PA" Part, it just requires a standard loudspeaker, non-amplified, it will use the internal amplifier inside the radio to power it.

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post #5 of 26 (permalink) Old 01-21-2006, 08:56 PM Thread Starter
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Yes, I caught that after I made the topic. It is indeed a CB, I didn't mean ham. And I didn't mean to power the speaker, I meant to power the actual cb. Thanks
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post #6 of 26 (permalink) Old 01-21-2006, 08:58 PM
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If it's just an automotive CB radio, you just have to ground the black wire and hook the red wire to the positive side of the battery.

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post #7 of 26 (permalink) Old 01-21-2006, 09:10 PM Thread Starter
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Cool. Now, my major concern is the placement of the external speaker. I originally planned on mounting it to the front roof, but I begun to think of things.

1. People messing with it
2. It's legality
3. The drag it would create on the highway.

Now, 1 and 2 aren't major factors, but 3 definately is. I heard about some people mounting smaller ones in the engine bay? Thanks for the replies so far
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post #8 of 26 (permalink) Old 01-21-2006, 09:36 PM
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Hang it underneath the car, maybe even inside the front bumper or behind the grill.
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post #9 of 26 (permalink) Old 01-22-2006, 02:45 AM
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My PA speaker is mounted right under the battery in my bird. It points down at the ground and can be heard a good distance from the car.

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post #10 of 26 (permalink) Old 01-22-2006, 11:15 AM Thread Starter
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Haha, cool guys, I'll find a way to mount it outside of sight somewhere. Hey Cali, how many watts is yours? You think 70 watts is enough or overkill or what? Thanks guys
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post #11 of 26 (permalink) Old 01-23-2006, 09:51 PM Thread Starter
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Okay, I'm in kind of a dilemna. I can get one of these

http://cgi.ebay.com/HD-POWER-CORD-w-...QQcmdZViewItem

to power it, but I kind of want the outlet open to power other stuff too. Should I just do this, or should I just find some way to hook it right up to the batter? I'm going for ease mainly. Thanks
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post #12 of 26 (permalink) Old 01-24-2006, 09:26 AM
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Quote:
Originally Posted by bill-murray
Okay, I'm in kind of a dilemna. I can get one of these

http://cgi.ebay.com/HD-POWER-CORD-w-...QQcmdZViewItem

to power it, but I kind of want the outlet open to power other stuff too. Should I just do this, or should I just find some way to hook it right up to the batter? I'm going for ease mainly. Thanks
grab some power from the fuse box in the car. There should be an open circut there that you can fuse and attach the wires there..

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post #13 of 26 (permalink) Old 01-24-2006, 12:38 PM
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I had pa's in all my cars. All you have to do i s go to radioshack an buy a external pa speaker, wire an universal headphone jack. There is a port on the back of the cb that says pa or extrenal speaker use the pa port. Mine is hidden in the engine bay. Be careful you will be gettin into trouble!!

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post #14 of 26 (permalink) Old 01-24-2006, 06:56 PM Thread Starter
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Yeah, I don't have a problem powering or rigging up the speaker. I have trouble powering the actual cb. A guy on another forum wired it into his windshield wiper fuse slot. What amp fuse would I use? I'm using the Cobra 29 BTW
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post #15 of 26 (permalink) Old 01-24-2006, 09:44 PM
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Thats a good radio. I wired mine uner the counsel into the cig lighter

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post #16 of 26 (permalink) Old 01-24-2006, 09:46 PM
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You should be able to get away with a 2.5 or 5 amp fuse.

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post #17 of 26 (permalink) Old 01-24-2006, 09:57 PM Thread Starter
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Okay, I'll use a 5. Which slot should I put it in? Just any empty ones, or what? Sorry if my questions are pretty lame, I just have no fuse experience. Thanks
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post #18 of 26 (permalink) Old 01-24-2006, 10:13 PM
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Yeah if theres not a holder on the wire u can get them at radio shack an just slpice it in the wire from the cb.

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post #19 of 26 (permalink) Old 01-26-2006, 09:56 PM
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Heh, I used to have a cobra 29, had the weather band receiver, nightwatch illumination, soundtracker, and I had it modified to twice it's legal RF output. Not really anyone to talk to around here, plus I didn't want a huge fine if I got caught with my illegal power mods, so...no more radio. But it was a good radio...
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post #20 of 26 (permalink) Old 01-27-2006, 09:18 AM
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Connecting the radio's 12v wires to any 12v source under the dash will work, and be convenient so the radio will turn off when the ignition is turned off in case you forget, BUT will allow more noise from the ignition system, wiper motor, turn signals, etc. If it is wired directly to the battery with a fuse, you will not get as much noise from the electrical system in the radio. The only down side to this, is if you forget to turn off the radio, it will drain your battery over a extended period. I have been a Ham Radio operator since 1976 and have a $2,000 system in my daily driver wired to the battery with fuses.

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post #21 of 26 (permalink) Old 01-27-2006, 06:00 PM Thread Starter
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Wow sweet tower man! Heh, what kind of fuse should I use for my radio (Cobra 29). I decided to run it through the fuse box. I heard everywhere from 1-5 from different sources.
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post #22 of 26 (permalink) Old 01-27-2006, 08:20 PM
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Quote:
Originally Posted by 392Bird
If it is wired directly to the battery with a fuse, you will not get as much noise from the electrical system in the radio. The only down side to this, is if you forget to turn off the radio, it will drain your battery over a extended period.
If, however, you wire it directly to the battery with a relay connected to a 12 volt source from under the dash, you're golden.

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post #23 of 26 (permalink) Old 01-28-2006, 10:39 AM Thread Starter
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What would be the benefit of doing this over just wiring it into the fuse box?
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post #24 of 26 (permalink) Old 01-28-2006, 11:43 AM
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If you run the 12 V for the radio from the battery through a relay, the relay will prevent battery drain if you forget to turn it off, and still reduce the electrical engine , wiper, turn signal , fan, etc, noise. Feed the radio from the battery, and activate the relay from any key on 12v source.

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post #25 of 26 (permalink) Old 01-28-2006, 02:57 PM Thread Starter
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Oh, I see. I'll probably go that route then.
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post #26 of 26 (permalink) Old 02-01-2006, 08:55 PM
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Can't wait to get into some of the 4th semester stuff. Mess around with RF signals.

http://www.the12volt.com/relays/page5.asp#rtol


You can hook the remote-on to the accessory wire, like the one going to your radio. You could also put a switch on that small plate beside the stereo if you don't have a motorized antenna.


I hooked my CB to the accesory wire alone, and it's fine, but will tend to crackle when I turn the bass up. I have a PA speaker under the hood, but may be using another one I have, because I almost went deaf last time I used it. I just stuck mine under the hood where it wouldn't have to be bolted and not fall out.
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