CB picking up engine noise?

Kiff · 07-23-2007, 11:12 PM

So I just installed a CB in my 4runner, the antenna is at the back, but when the squelch is turned down, the cb puts out engine noise, the frequency fluctuates with the engine RPM. what have I done wrong? is this normal?

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Red3.slow · 07-24-2007, 09:04 AM

bad ground

95ToyotaPU007 · 07-24-2007, 03:17 PM

I'm going to say bad ground too. Make sure you scrape away some paint where the ground cable contacts the chassis.

olharleyman · 07-24-2007, 03:23 PM

Quote:

Originally Posted by 95ToyotaPU007

I'm going to say bad ground too. Make sure you scrape away some paint where the ground cable contacts the chassis.

Also run directily to your battery posts and add a fusible link on the positive side

mt_goat · 07-24-2007, 03:45 PM

I've had the same problem, I ran a twisted pair straight to the battery posts and it didn't help. Next I tried an inline noise filter and that got rid of about 75% of it but still have some.

stormin94 · 07-25-2007, 11:05 PM

calibrate SWR. make sure it's less than 3. or check your grounds. and also check your antenna mounting. how far above the roof does it stick up???

drew303 · 07-26-2007, 01:34 AM

Every CB I've seen picks up some engine noise.

I got a cobra night something or other... sorry its way to late and im way to tired to remember ANY specifics atm...

anyway, mine picks up noise from the air fan more than anything but theres some switch on the CB (on mine .. cobra nightwatch thats it)... that eliminates engine noise pickup...

SWR meters are for tuning your antenna so the bandwith is tuned to the CB. Usually tune it so its equal above and below chan 19 but some truckers center it on their preferred or most used channels.

and like i said im to damn tired to remember what SWR metering range is optimal... I remember something like below 2 at chan 1 and 39 is good. .. Its mostly to save the CB from frying when you transmit a signal. You can hurt them if you try to transmit with an antenna thats totally not tuned (to long or to short).....

Firestik antennas have the adjustable screw at the top... HIGHLY RECCOMENDED over the "snip the wire" types.

dcg9381 · 07-26-2007, 05:52 AM

Google search: "ground loop" - some noise is normal. You can go to an inline filter after you confirm that your ground is good.

07-24-2007, 09:04 AM	#2 (permalink)
Red3.slow Contributing Member Join Date: Mar 2006 Location: Little Rock, Ar Posts: 1,181	bad ground __________________ -Miles -Firefighter/EMT T.E.A Taxed Enough Already

07-24-2007, 03:17 PM	#3 (permalink)
95ToyotaPU007 Registered User Join Date: Apr 2004 Location: Northern New Mexico Posts: 905	I'm going to say bad ground too. Make sure you scrape away some paint where the ground cable contacts the chassis. __________________ '95 PU Ext. cab, 4wd OEM 3.0L with spark delivered by OEM Ignition 348,xxx miles, on sixth set of tires sittin' on OEM wheels '04 Silver Corolla S, DVD head unit going in soon '85 F-250 351W H.O. 401,000 miles, first 351W dead at 367,xxx miles, Hedman headers, flowmaster exhaust, $1200 audio system, Alpine Alarm

07-24-2007, 03:45 PM	#5 (permalink)
mt_goat Contributing Member Join Date: Nov 2002 Location: Oklahoma State Posts: 8,916	I've had the same problem, I ran a twisted pair straight to the battery posts and it didn't help. Next I tried an inline noise filter and that got rid of about 75% of it but still have some. __________________ ~Dale~ 93 4X4 ext-cab, auto, SR5, 3.4 V6, supercharged, 2.1" pulley, URD fuel mods, Aquamist WI, IPT valve body mod, dual cases, 4" superlift front, Alcan springs rear, 33 BFG MT, ARB locked front & rear, 5.29 US Gears, RB 1" Body Lift, 1.5" ball joint spacers, manual hubs, TJM T-17, Warn m8000.

07-25-2007, 11:05 PM	#6 (permalink)
stormin94 Contributing Member Join Date: Jun 2007 Location: Lake County, CA/Sacramento Posts: 3,535	calibrate SWR. make sure it's less than 3. or check your grounds. and also check your antenna mounting. how far above the roof does it stick up??? __________________ 1994 Toyota 4Runner SR5 4X4 213,000 miles and counting 3.0 V6, 5 speed 10/15 MPG city/hwy(with 33's) Current Mods Headers, 2.5" Flowmaster custom exhaust, K&N FIPK KC Daylighter 100 Watt lights Ranchos x4, 2" Lift Downey coils 33-12.50 M/T's, 1" t-bar lift, 1" body lift Tow pkg w/ lighthookups Silverstar Headlights, Pioneer Deck w/XM Brushguard 250Watt JLAudio 8" W3 Sub Future Mods 12V Aux outlet-400/800peak inverter roof basket/lights Air locker 4.88 gears H.O. Alternator

07-26-2007, 01:34 AM	#7 (permalink)
drew303 Registered User Join Date: Dec 2006 Location: Olympia, WA Posts: 2,032	Every CB I've seen picks up some engine noise. I got a cobra night something or other... sorry its way to late and im way to tired to remember ANY specifics atm... anyway, mine picks up noise from the air fan more than anything but theres some switch on the CB (on mine .. cobra nightwatch thats it)... that eliminates engine noise pickup... SWR meters are for tuning your antenna so the bandwith is tuned to the CB. Usually tune it so its equal above and below chan 19 but some truckers center it on their preferred or most used channels. and like i said im to damn tired to remember what SWR metering range is optimal... I remember something like below 2 at chan 1 and 39 is good. .. Its mostly to save the CB from frying when you transmit a signal. You can hurt them if you try to transmit with an antenna thats totally not tuned (to long or to short)..... Firestik antennas have the adjustable screw at the top... HIGHLY RECCOMENDED over the "snip the wire" types. __________________ 1987 Pickup, single cab, 22R, new head, 260 cam TG 3" SAS, rear disc brakes, chromoly rear axles, Chromoly Birfs, Tcase brake, 37x12.50R15 MT/Rs, 5.29 gears, rear Aussie Locker, front Detroit Truetrac.

07-26-2007, 05:52 AM	#8 (permalink)
dcg9381 Registered User Join Date: Jun 2006 Location: austin, tx Posts: 1,825	Google search: "ground loop" - some noise is normal. You can go to an inline filter after you confirm that your ground is good. __________________ http://www.22REturbo.net

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