Hello all,
I'm a newbie here so take it easy on me please. It's been 30 years since I've had another base station. But I've finally have one up now and just getting back into it. Bare with me but I have a few questions here. I have this annoying problem with this crackling, buzzing, 60 hz noise coming through the receive on every channel except every 4th channel which is clear like a bell. Every three channels in between, (For example - 5, 6, & 7 has this horrible buzzing, with a little crackle & a hum which is definately sounding like a 60 hz hum. I have been inestigating this with an old trick of using a AM transistor radio and walking around the house. Low & behold I have found many sources with this trick all over the house. My wireless modem for my computer network here was the worse.
A couple light dimmers, A few wall warts and these new Black & Decker bug repellers that you plug into your wall receptacles. Needless to say, the Modem transmit frequency was even going down the Earth ground cable to the water pipe. But after turning off the Modem, It was gone from the Earth ground cable, but the noise was still coming out of my CB. In fact, I have turned everything off in the house except the CB. Still this 60 hz hum three channels in a row and one clear channel before & after the three noisy ones. As for my radios, I'm using an old Cobra 139 base & a mobile cobra 29 ltd classic. Same noise on both CBs. With the Mobile, I'm using a Pyramid Gold Series power supply. With the supply running & the classic ltd on, I get the noise. When I turn off the CB with the power supply still running, the noise goes away. No noise from my supply at all. I have not tried hooking a car battery up yet, but I will soon to see if it's actually my mains from the cicuit box, or if it's an antenna related problem. For an antenna, ( which I regret buying now ) a Solarcon IMAX 2000, I have no ground radials yet, but it seems to be working well at 60 ft total height from the ground.
I have grounded the bottom of the mast with a 50 ft 8 gauge stranded copper wire down to it's own 8' copper ground rod pounded into the ground. It is in the ground about a foot away from my neutral ground rod from the power mains. I suspected 60 hz hum leak to the mast's ground rod, so I unhooked the ground cable from the mast, still this horrible buzzing 60 hz hum. To furher complicate my post, I even went as far as holding my AM transistor radio 2" from the main power lines right before they enter my house through the rafters, little noise to my surprise, (with my wireless network modem off mind you) hardly any noise at all, not like what's coming from my radios. So it's turning out that my mains was not as noisy as I thought. I'm at my wits end for clear reception. Has anyone here had this sort of problem? My SWR is a good, solid 1.4 no matter what weather I am having here. My transmit seems to be ok considering what a couple locals have told me with a radio check. 9db or so at 15 miles or more.
Is this normal for my old radios to buzz this 60 hz hum? One last thing before I close, I noticed both of my radios have SO-239 female bracket type connectors for my antenna hookups mounted on both radios which is the norm I'm guessing. Alligator teeth all around the diameter of the connectors. But my coax has the PL-59 connectors with just the two locator nothes on the male connectors on both ends of the coax. Is this normal? I can't see how in the world they are being bonded flush when screwing them together. Shouldn't my connectors on my coax be of the same match as the female one's mounted on the back of both my cobras? Well I've visited many CB online suppliers but no Male SO-239 plugs at all, mmmm I must be missing something here. For all I know my connections are not good enough in this type of hookup scenario? Sorry for the book I've written here, but I'm deperate. Anyone care to take a stab at me? Stab away. 73's
I'm a newbie here so take it easy on me please. It's been 30 years since I've had another base station. But I've finally have one up now and just getting back into it. Bare with me but I have a few questions here. I have this annoying problem with this crackling, buzzing, 60 hz noise coming through the receive on every channel except every 4th channel which is clear like a bell. Every three channels in between, (For example - 5, 6, & 7 has this horrible buzzing, with a little crackle & a hum which is definately sounding like a 60 hz hum. I have been inestigating this with an old trick of using a AM transistor radio and walking around the house. Low & behold I have found many sources with this trick all over the house. My wireless modem for my computer network here was the worse.
A couple light dimmers, A few wall warts and these new Black & Decker bug repellers that you plug into your wall receptacles. Needless to say, the Modem transmit frequency was even going down the Earth ground cable to the water pipe. But after turning off the Modem, It was gone from the Earth ground cable, but the noise was still coming out of my CB. In fact, I have turned everything off in the house except the CB. Still this 60 hz hum three channels in a row and one clear channel before & after the three noisy ones. As for my radios, I'm using an old Cobra 139 base & a mobile cobra 29 ltd classic. Same noise on both CBs. With the Mobile, I'm using a Pyramid Gold Series power supply. With the supply running & the classic ltd on, I get the noise. When I turn off the CB with the power supply still running, the noise goes away. No noise from my supply at all. I have not tried hooking a car battery up yet, but I will soon to see if it's actually my mains from the cicuit box, or if it's an antenna related problem. For an antenna, ( which I regret buying now ) a Solarcon IMAX 2000, I have no ground radials yet, but it seems to be working well at 60 ft total height from the ground.
I have grounded the bottom of the mast with a 50 ft 8 gauge stranded copper wire down to it's own 8' copper ground rod pounded into the ground. It is in the ground about a foot away from my neutral ground rod from the power mains. I suspected 60 hz hum leak to the mast's ground rod, so I unhooked the ground cable from the mast, still this horrible buzzing 60 hz hum. To furher complicate my post, I even went as far as holding my AM transistor radio 2" from the main power lines right before they enter my house through the rafters, little noise to my surprise, (with my wireless network modem off mind you) hardly any noise at all, not like what's coming from my radios. So it's turning out that my mains was not as noisy as I thought. I'm at my wits end for clear reception. Has anyone here had this sort of problem? My SWR is a good, solid 1.4 no matter what weather I am having here. My transmit seems to be ok considering what a couple locals have told me with a radio check. 9db or so at 15 miles or more.
Is this normal for my old radios to buzz this 60 hz hum? One last thing before I close, I noticed both of my radios have SO-239 female bracket type connectors for my antenna hookups mounted on both radios which is the norm I'm guessing. Alligator teeth all around the diameter of the connectors. But my coax has the PL-59 connectors with just the two locator nothes on the male connectors on both ends of the coax. Is this normal? I can't see how in the world they are being bonded flush when screwing them together. Shouldn't my connectors on my coax be of the same match as the female one's mounted on the back of both my cobras? Well I've visited many CB online suppliers but no Male SO-239 plugs at all, mmmm I must be missing something here. For all I know my connections are not good enough in this type of hookup scenario? Sorry for the book I've written here, but I'm deperate. Anyone care to take a stab at me? Stab away. 73's
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