bleeding my neighbors stereo

[Twink]

here's the setup... i live in an apartment. i've got an imax 2000 on a 17' mast so it clears the roofline. i've got a cobra 148F gtl with a RFX-75 doing 80 watts PEP. i've got a 3' jumper going to a workman low pass filter, then 50' going to the imax. i cause very little tvi, but my neighbor a few buildings back said he could hear me on his stereo. i'll have to check with him again, because since he said that i raised the antenna 7 foot(it was on a 10' mast before) and upgraded the ground wire (from 14 awg to 10 awg). i can hear my radio in my home computer speakers too, but not in my ol' lady's headset. and there is no TVI.

what can i do to fix this? would a balun fix this? maybe a better low pass filter? the workman didn't really seem to do anything.

[PONY EXPRESS]

Sounds like ferrite beads might be in order
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[Red Warrior]

The most likeky cause is the coax has become part of the antenna and is radiating. Get 18 feet of coax and build yourself a Balun. Connect the Balun as close to the antenna feed as possible. If you have never built a Balun refer to this web site: [Please login or register to view this link]

Simple to build and very effective.

[Circuit Breaker]

A low pass filter will do nothing to fix the problem with the stereo. It's quite possible that his speaker wires are acting as antennas and his speakers are rectifying the signal. I would try some snap on ferrite cores and put them on his speaker leads at both ends...at the stereo and at the stereo.

['Doc]

Lot's of possibilities, but I think 'Circuit Breaker's is as likely as any of them. The stuff being interfered with is always a probable cause, especially with RF and stereos, etc. Since this is 'several buildings' away from you I would tend to think the problem is in that equipment getting interfered with. A couple/few ferrite beads/chokes would seem to be a simple enough thing to try. Remember the power cord too!
And now for the "gotch'a". Any time you work on someone else's equipment, you are liable for any problems with it after you 'fiddle' with it. There are several "but's" to that, but in general, that's the way it is. You want to be sort of careful about that sort of thing. Hand the parts to -him-, tell him how to do it, and let -him- do it. Yes, I know what that sounds like. I also know how the alternative is like too. You really don't wanna go there is you don't have to. But that's up to you...
- 'Doc


The FCC's 'Interference Handbook' is a nice thing to have laying around. It gives you all the typical examples of interference, probably cause, solutions, and so on. Unless things have changed, it's free for the asking/down loading, so why not? It's also very nice if you have to go to court, as a "looky here!" thingy to show the judge. I hope you don't think I'm kidding, I'm not.

[Twink]

i built the balun... didn't do a thing... gotta go with the torroids i guess. i put two rf chokes on my speakers, and it cured it. now i gotta go around the neighborhood installing chokes.... ugh...

[WHEELSTUD]

Buy your neighbor a couple of ferrite R.F. chokes and have them put them on their speaker wire. This worked for me. I was bleeding over one of my friends radio from 2 blocks away when he was trying to listen to Rush Limbaugh. I gave him a pair of chokes and it took care of the problem. I don't think your coax is leaking. You are more likely going through their speaker wire.

[jessejamesdallas]

Take the RFX-75 out of the radio, and just run at the 4w legal limit, and No-Mo-Problem... As long as your running Power in a CB Radio, your going to have a chance of bleeding into cheep electronic gadgets or speakers...

[PONY EXPRESS]

Take the RFX-75 out of the radio, and just run at the 4w legal limit, and No-Mo-Problem... As long as your running Power in a CB Radio, your going to have a chance of bleeding into cheep electronic gadgets or speakers...

JESSE THAT WOULD BE NO FUN YOU

[jessejamesdallas]

Take the RFX-75 out of the radio, and just run at the 4w legal limit, and No-Mo-Problem... As long as your running Power in a CB Radio, your going to have a chance of bleeding into cheep electronic gadgets or speakers...

JESSE THAT WOULD BE NO FUN YOU

I know...That's why I don't have a Base set-up!

[North Texas Mudduck]

tell him his equipment is crap
and here is the disclaimer stating so:

Labeling requirement in 47 CFR 15.19 indicate that a Part 15 device must not cause harmful interference and must accept interference.

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

Question: Please explain exactly what the second part of this means? And please include an example of a design feature that would be prohibited by the second part of this statement?

Answer: You ask why our label (required in 47 CFR 15.19) indicates that a Part 15 device must accept interference. This refers to the fact that Part 15 devices are unlicensed and operate under a sufferance basis. As such the device is not protected against interference and the parties operating such a device can not seek redress from parties operating radio communication services. In other words they do not get protection from interference and thus must accept interference. Because of this, any part 15 device should be designed to operate robustly under all conditions


tell him to look in his manual on his equipment an read the disclaimer

[mhmacw]

tell him his equipment is crap
and here is the disclaimer stating so:

Labeling requirement in 47 CFR 15.19 indicate that a Part 15 device must not cause harmful interference and must accept interference.

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

Question: Please explain exactly what the second part of this means? And please include an example of a design feature that would be prohibited by the second part of this statement?

Answer: You ask why our label (required in 47 CFR 15.19) indicates that a Part 15 device must accept interference. This refers to the fact that Part 15 devices are unlicensed and operate under a sufferance basis. As such the device is not protected against interference and the parties operating such a device can not seek redress from parties operating radio communication services. In other words they do not get protection from interference and thus must accept interference. Because of this, any part 15 device should be designed to operate robustly under all conditions


tell him to look in his manual on his equipment an read the disclaimer

you could avoid an ugly situation with a neighbor and possibly other neighbors by buying a hand full of ferrite and passing them out like candy...you never know he might be your landlords 2nd cousin twice removed and might stumble across a byline in your rental contract about "permanant attachments" to the building.

[TheCBDoctor]

Hi,

You are causing audio rectification, there is no way to eliminate that, but I would start by what jessejamesdallas said " Get rid of the RFX-75." They are bleed boxes. The carrier envelope looks like S****t. I am surprised that only your neighbor is complaining. Try a different CB. Even one with more power should cause less interference. The TVI filter in the radio is not doing a thing. Maybe a different radio, unmodified, with the same peak power will stop the interference.

If the engineers thought that removing parts would be good for the radio they would not have put them in.

If you want to prevent interference, and have some real fun, try a sideband radio. There is no carrier envelope and no harmonics due to the relationship of the carrier to the sidebands. In other words there is no percentage of modulation. You will get along with your neighbors, and talk twice as far with same amount of peak power.

If you are not talking sideband, then you are not talking on a real radio

Respectfully

[nutcracker]

I know that with my old setup whenever I ran rg58 radio shack junk my 1/4 waver would bleed over every around the area in their tvs, stereos, and computers. I upgraded to rg213, grounded the antenna very good, and most all of the bleed over has stopped. The old rg58 wasnt sheilded worth a crap!

[TheCBDoctor]

Hi nutcracker

You can not beat RG 213 for the price. It is the best semi rigid coax on the market. It will eliminate most of the problems associated with bleed-over, and it will last almost forever. It can even be buried if needed.

[De_Wildfire]

Sounds like you have a dirty amplifier. My antenna is on the chimney and I don't have any problems with RFI in the house running a high power amp. Cheap amplifiers only bring trouble that can cost you aggravation.

[Tinman590]

I got an L4B(not a cheap amp) to an imax and rg-213 it will bleed some, mic gain is the best way to control "splashing"

[Sheriff Bart]

In Philly I have a friend who uses a whippin' stick aka Imax 2000. He talks on a 29 with a variable and all the modulation in the world lol lol lol . Next door to him is a lady who still has an older tv and uses rabbit ears and he would kill her tv when he broadcasted. First he upgraded to some good double shielded coax and right at the bottom of the antenna he coiled about 6 turns and made a choke. It made a big difference and reduced the tvi > than 98%. Then he raised the Imax and got the feedline a approx. 3/4 wavelength off his rooftop. Cleared the problem 100% with his neighbor. The problem is the most current and radiation on that antenna is at the matching network in the base of it. Because it uses induction principles and is not direct feed it is lossy and prone to 'bleed'.


73's

[De_Wildfire]

I also have a L4B and I never run it outside the ALC range or in other words, keep it under 100% modulation. Run the amp according to the specs and not overdrive it. A few extra watts doesn't mean squat on someone's meter unless you double your power level.