Re: [tech] Radio/ Amp

[Matt Willey <mwilley@logical123.net>]

	My only quick thought would be to watch thr routing of that RCA
cable.  If there is extra, don't coil it, it becomes an antenna.  And,
never underestimate the importance of a good shielded RCA.  Ok, nothing
worth while, just a few thoughts.  Sounds to not be power related since
you can plug in that portable ok.  Unless the radio itself is doing it.
May try an isolator from radio shack on the amp.

	As for the questions...  You should never really run an amp of the
same wires as the radio, or really on any stock wiring for that matter.
However, since that amp is so small, it should not really matter.  I would
be surprised if it fixed it though.  And the power antenna lead, I don't
really know.  I do know that they put out very little current.  And I have
blown them before by overloading that lead.  SO, be careful.  That's it,
have fun.  So much work just to have a few tunes...

Matt

 On Wed, 24 Feb 1999, Chris Chemidlin
wrote:

> Hey kids...
> 
> After doing some motor work to my car, I thought Id treat myself and 
> install a radio. Ive run into a big noise.  Here's the setup.
> 
> 1)Sony 'knob style' radio /cassette------(+ & - are factory hookups, I 
> have the switched and constant power leads hooked together.)
> 
> 2)4x6 'chrystal' speakers (Mark mages  hand-me-downs...Thanks!)  that 
> don't make any useful sounds....(powered by radio power)
> 
> 3)small power amp (20x2) with RCA's and remote switch running on pass 
> side of car, and the power running on drivers side to fusebox constant 
> power.
> 
> 4)5.25 Phase-Linear speakers powered by amp.
> 
> OK, here's the bad symptoms.
> 
> when I turn the radio on (car off), the amp switches on and sounds fine.
> When I turn the radio on (car on), the amp has car noise (alt, brake 
> lights, horn) at one particular volume- it doesn't change when I turn it 
> up.  the radio still works fine, but big noise sucks...
> If I unplug the RCAs at the amp and plug in a portable CD player it 
> sounds fine---car on or off.
> 
> Now the amp seems to be grounded by the mounting screws--when I hook a  
> ground to the chassis or to the battery, the noise is still there.
> 
> Im no stereo guru, but I like to pretend that I can complete a simple 
> circut! Should I try to run the power and ground to the ones the radio 
> is hooked to?  question#2)  can I run the 'switch' wire from the amp to 
> the FUBA to power it? Right now the 'pwr ant' lead off the radio 
> switches the amp.
> 
> 
> thanks for any insight!
> 
> 
> 
> CHRIS CHEMIDLIN
> http://www.spredhaus.com
> http://www.angelfire.com/nj/spredhaus
> 58 Type1 Ragtop
> 84 Jetta uGLi
> 
> 
> 
> 
> 
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