| Author |
Message |
    
Five
Junior Member
Username: Five
Post Number: 11
Registered: 7-2009
| | Posted on Thursday, August 06, 2009 - 3:48 am: | 
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I have a spike coming from my brake light switch, I hear it my radio when I let off the brake. What would be the best way to fix it? I have not taken the coaxial off to check if it is from the coaxial or the power wires yet. It drives me insane... |
Starface
Senior Member
Username: Starface
Post Number: 2533
Registered: 1-2005
| | Posted on Friday, August 07, 2009 - 7:55 pm: |
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What kind of radio you using, they make many power cords with filters to take out that kinda noise.
also be sure you have a good antenna and radio ground.
George/Starface/KI4NBE
CEF 476 CVC 014 HAM 181
SOUTHEAST CEF NET CONTROL
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Five
Junior Member
Username: Five
Post Number: 12
Registered: 7-2009
| | Posted on Saturday, August 08, 2009 - 4:43 am: |
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It is the magnum 257 blue face. I have a trunk mount Wilson 5000 that is grounded to the trunk lid with two ground straps from the lid to the body. My radio is not grounded other than the regular ground to the shock tower and the power to the battery. the wire size for the power and ground are AWG-8. There is very little static on Rx the SWR is 1.1 and there is no noise from anything except the brake light switch. It only does it on the 257 and not my other radios. |
Tech237
Moderator
Username: Tech237
Post Number: 1206
Registered: 4-2004
| | Posted on Saturday, August 08, 2009 - 12:37 pm: |
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take a capacitor of at least 1uF and connect from the hot side of the the brake switch to ground. For added safety include a 1MOhm resistor in series too.
switch ----||---^^^^^^-----ground
Simon
Tech237
N7AUS
.
I thought he said, "there was no rust for the wicked, and I own an MGB"
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Starface
Senior Member
Username: Starface
Post Number: 2535
Registered: 1-2005
| | Posted on Saturday, August 08, 2009 - 4:42 pm: |
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Very good Simon, you beat me to my guns. very good.
Five follow Simon, if you need any other help let us know.
George/Starface/KI4NBE
CEF 476 CVC 014 HAM 181
SOUTHEAST CEF NET CONTROL
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Five
Junior Member
Username: Five
Post Number: 13
Registered: 7-2009
| | Posted on Saturday, August 08, 2009 - 9:45 pm: |
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OK I will try it and see what happens. Should I ground the back of the radio to the car body also? Thanks... |
Tech808
Moderator
Username: Tech808
Post Number: 17055
Registered: 8-2002
| | Posted on Sunday, August 09, 2009 - 6:46 am: |
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Yes, ground EVERYTHING! to a SINGLE POINT GROUND to the car frame.
ie: Amp / Pre-amp (if used), Antennna, Antenna Coax, External Speaker (if used), Radio frame/case and any meter's if used.
Hope this help's,
Lon~Tech808
N9CEF
CEF#808~CVC#002
Radio Enthusiast!
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Five
Junior Member
Username: Five
Post Number: 17
Registered: 7-2009
| | Posted on Tuesday, August 18, 2009 - 9:31 pm: |
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I grounded everything and added the cap and resistor and I have no spikes and virtually no noise! I talked to a guy in south eastern Mississippi on AM from northern Oklahoma at night with no skip on the little Magnum 257 and the Wilson 5000 trunk mount and he said it is loud and clear! Oh I am not using the Wilson mount I am using a stainless mount with RG58x mini cable and a Wilson 5000 load and whip off a magnet mount and the SWR is flat 1.1 or better. Thanks I appreciate the help. |
Starface
Senior Member
Username: Starface
Post Number: 2546
Registered: 1-2005
| | Posted on Wednesday, August 19, 2009 - 2:53 pm: |
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All well goes well.... glad your good to go now.
George/Starface/KI4NBE
CEF 476 CVC 014 HAM 181
SOUTHEAST CEF NET CONTROL
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