Looking for a bleed over fix?

[kidx]

The filters being discussed go in the receiver IF path, which is at a different frequency than CB and usually down at 455KHz, you can't put that in line with the antenna like an SWR meter. Same with RF Gain, that controls the gain of a receiver stage or two and is part of the inner workings of a receiver, can't put that external without also cutting your transmit power down with it. Its also impossible to make an external filter at 27MHz that will allow only one channel to pass through to reduce bleedover. Making a single channel width filter at 455KHz is possible and there are literally hundreds available off the shelf.

It would be easy to incorporate an RF Gain in an IF filter assembly and it could be a simple PIN diode attenuator that is controlled with an additional pot. But you would be cutting into the receiver IF path on a circuit board and inserting the whole thing there.
prcguy

ok thanks alot.

 

[RFI-EMI-GUY]

Why has some one not made a better RF Gain filer adapter that plugs on to your coax or a include in a SWR Meter?

Ummm; you could put a power attenuator in your coax line, but every 3 dB reduction would also cut your transmit in half. And you cannot filter the specific channel at the coax (well you can if you have super skills and NASA budget).

Your first thoughts about better receiver IF filters, and as suggested, by other reducing RF gain would help. The website CBC International is operated by Lou Franklin, he is author of some fine technical manuals. You might want to buy his repair guide . If he is still taking calls, you might ask if one of the IF filter kits will work in your radio and if he can recommend someone locally to install it. But I wonder if his kits work with newer radios which have all surface mount parts and filters.

Frankly in my experience a lot of the CB "technicians" seem to be obsessed with turning adjustments in the radio which were already tuned to near perfection at the factory in Manila. Unless you have some specific technical equipment and skills, adjusting the radio is a bad idea.

You don't need a "HAM LICENSE" for any of this, nor will having a HAM LICENSE fix any problems or remove gray hair. But buying a copy of the ARRL handbook (even a 10 year old one) would be helpful in your quest to learn.

Receiver IF crystals have specific characteristics and if you know them, you can buy ones that are a bit sharper, or cascade two filters in place of one. But it takes study and skill.

If you compare specs between radios you might find that some makes and models are better than what you have. Then trade up to one more suited.

Now the bad news, if the guy on the adjacent channel has messed with his radio and is over-modulating and splattering, there is no filter in the world that will fix that.

PRC guy made some good comments, and more succinctly than my ramblings!

 

[kidx]

Ummm; you could put a power attenuator in your coax line, but every 3 dB reduction would also cut your transmit in half. And you cannot filter the specific channel at the coax (well you can if you have super skills and NASA budget).

Your first thoughts about better receiver IF filters, and as suggested, by other reducing RF gain would help. The website CBC International is operated by Lou Franklin, he is author of some fine technical manuals. You might want to buy his repair guide . If he is still taking calls, you might ask if one of the IF filter kits will work in your radio and if he can recommend someone locally to install it. But I wonder if his kits work with newer radios which have all surface mount parts and filters.

Frankly in my experience a lot of the CB "technicians" seem to be obsessed with turning adjustments in the radio which were already tuned to near perfection at the factory in Manila. Unless you have some specific technical equipment and skills, adjusting the radio is a bad idea.

You don't need a "HAM LICENSE" for any of this, nor will having a HAM LICENSE fix any problems or remove gray hair. But buying a copy of the ARRL handbook (even a 10 year old one) would be helpful in your quest to learn.

Receiver IF crystals have specific characteristics and if you know them, you can buy ones that are a bit sharper, or cascade two filters in place of one. But it takes study and skill.

If you compare specs between radios you might find that some makes and models are better than what you have. Then trade up to one more suited.

Now the bad news, if the guy on the adjacent channel has messed with his radio and is over-modulating and splattering, there is no filter in the world that will fix that.

PRC guy made some good comments, and more succinctly than my ramblings!

Thanks for all the info guys.

 

[jonwienke]

I'd be hesitant about modding the radio. The source of the interference is probably splattering across multiple channels, and better IF filtering on your end won't fix that at all. It will only make your receiver better at rejecting RF signals that are not within the channel you are trying to receive. But if the source of the interference is broadcasting on multiple channels simultaneously (usually caused by excessive modulation and/or low-quality linear amplifiers), you're SOL unless you can use a beam antenna that rejects signals from that particular direction.

 

[prcguy]

I occasionally tune through the CB band with a radio that has a spectrum scope. When the skip is in I usually see stations on ch 6 or 11 that have signals upwards of 1MHz wide. They will be talking on ch 6 but they have massive amounts of energy across the CB band and way out of band. You can't make out the words they are saying anywhere but ch 6, but you can definitely hear the buzz buzz buzz of their modulation even way outside the CB band.

When these kinds of idiots fire up their filthy high power stations there may be nothing you can do but turn your radio off. I'm probably 1500mi from a couple of these stations and if I were legitimately trying to use any CB channel near 6 it would be impossible unless the people I'm talking to were within a mile or so with a stock radio.

The genius's running these high power sewer stations must not realize that every amount of power spread out across the band is power that is not available on the channel they are supposedly talking on. I estimate at least half the power they are transmitting is not on the channel they are on. In these cases no filter or RF gain or anything will reduce the interference these golden voices of the mentally challenged are spewing out.
prcguy

 

[KC4RAF]

'PRCGUY', I've had the chance to talk to

some of these idiots in person, and their response is, "I don't care how much my radio bleeds over..."
They say the FCC won't come looking for them, and to some extent, I have to agree. Some of them have been operating for a LONG time with out being caught!
"The genius's running these high power sewer stations must not realize that every amount of power spread out across the band is power that is not available on the channel they are supposedly talking on."
They just don't care...

 

[kidx]

some of these idiots in person, and their response is, "I don't care how much my radio bleeds over..."
They say the FCC won't come looking for them, and to some extent, I have to agree. Some of them have been operating for a LONG time with out being caught!
"The genius's running these high power sewer stations must not realize that every amount of power spread out across the band is power that is not available on the channel they are supposedly talking on."
They just don't care...

i was on 19 and the guy told me to take my convo to another F******* channel. I was just asking how the Ambassador bridge was wow. Can't these rule breakers be punished I was raised to respect the rules of CB for there it wont be taken away from us if this keeps and the FCC or the Canadain Gov has to monitor it GRS will be taken away. I went down to 18 and told the guy off he bleeds still on all channels i can make out what he says on channel 1 i am only 1 or 2 streets over these guy's should be in trouble they are ruining CB Band i understand being close to some one but why pic channel 18 of all channels for a base channel why not 15 or something or 10?

 

[RFI-EMI-GUY]

Its really a shame because the band could be quite useful with some tweaks to the equipment standards and some enforcement of the rules, especially modulation.

On most days if you tune through the band with a general coverage receiver all you can make out is a huge bump in noise floor corresponding to each channel. Nothing intelligible.

Europe has adopted FM as a primary operating mode, though you can use the AM and SSB modes as well in some countries.

 

[prcguy]

If I still used CB like I did in High School, I would not take too kindly to someone telling me to take it somewhere else. My new hobby would become wreaking his hobby and I would be very good at it. That mentality is probably very common on CB these days.
prcguy

i was on 19 and the guy told me to take my convo to another F******* channel. I was just asking how the Ambassador bridge was wow. Can't these rule breakers be punished I was raised to respect the rules of CB for there it wont be taken away from us if this keeps and the FCC or the Canadain Gov has to monitor it GRS will be taken away. I went down to 18 and told the guy off he bleeds still on all channels i can make out what he says on channel 1 i am only 1 or 2 streets over these guy's should be in trouble they are ruining CB Band i understand being close to some one but why pic channel 18 of all channels for a base channel why not 15 or something or 10?

 

[KC4RAF]

I agree with you 'kidx'. You have these low life pieces of

snake crap that ruins it for others.
I will not admit to it, but I've also known a couple of guys who did a number on one kealow watter that destroyed his big Gizmochy(?) antenna and cable. The guy left home for a few hours and when he came back, saw the damage, called the SO, and tried to collect insurance (to no avail lol). The SO said they would work it as vandalize in the felony zone; but nothing or nobody was ever convicted. Needless to say, the kealow watter gave up his hobby of CBing; (his wife was not happy because the tire marks left in the yard tore up the grass, he flowers, etc.)

 

[kidx]

Whats funny is my family has been here way longer and his only came here in ww2 from what he was saying so i am not happy with him over powering me then again he could of been more nice i am on 19 now and hope he dont interfere with me if so ill have to call it a day. I just dislike people think there king **** and yet my family been in Canada going back far as the late 1800's and i get no respect here only treated like utter ****. When you all respect me ill respect you untill then grow the **** up on CB Band and follow our rules casue when its taken away ya wont like it.