Who Uses CB Radios?

[k0ua]

This was all in the early 60's and the we had a lot of fun listening in...

Apparently the garage door opener flaw was also more prevalent in the 50's/60's

At one time I had a sailboat with a cable antenna that went all the way to the mast... someone told these types of antennae were illegal for sometime... but since I didn't have a radio I was not worried about it... the previous owner spent a lot of time in California Coastal Waters

Garage door recievers themselves aren't much better, but they all have digital locking now not just responding to RF at a certain frequency. So if the digital "rolling code" is not there they likely won't respond.

 

[k0ua]

It may be deficient by design, but the FCC made it chrystal clear (pun intended) that such interference was to be tolerated, both giving and receiving.

I was working on a telephone paging system the other day, having all kinds of trouble. Too few inputs, for number of signals and no proper mixing amplifiers, so I ended up with all kinds of mismatched inputs and ground loops. But when I powered down the amp, some radio station came in clear as a bell, until the caps discharged. Weird, which sent the owner running to find out what was going on, which I didn't need.

Anyway, I went back with a bunch of isolation transformers and everything was fine.

Yes if inputs are not properly impedence matched, that is an open invitation to RF. Some nice disk ceramic caps across inputs can go a long way to solving RF problems.

I had a problem with my professionally installed alarm system when I transmitted on 80 meters with anything over about 45 watts of power. It would throw a system alarm, bout not being able to "see" its alarm speaker module. Some .01 microfarad disk ceramics on the power leads and inputs solved that problem real quick.

 

[MossRoad]

Just found two new in box CB radios in the basement of the home I bought... still finding things... hope to find the cache of bullion soon!

Never quite know what to expect with estate type sales.

Sound like a blast! :thumbsup:

 

[ultrarunner]

Reading threads like this is eye opening as to how much I don't know!

 

[MossRoad]

It may be deficient by design, but the FCC made it chrystal clear (pun intended) that such interference was to be tolerated, both giving and receiving.

I was working on a telephone paging system the other day, having all kinds of trouble. Too few inputs, for number of signals and no proper mixing amplifiers, so I ended up with all kinds of mismatched inputs and ground loops. But when I powered down the amp, some radio station came in clear as a bell, until the caps discharged. Weird, which sent the owner running to find out what was going on, which I didn't need.

Anyway, I went back with a bunch of isolation transformers and everything was fine.

At my old employer we had several cheap sets of PC speakers that would pick up the local radio station that transmitted from a couple blocks over. It was weird.... the radio programming, not the phenomenon. :laughing:

 

[MossRoad]

Reading threads like this is eye opening as to how much I don't know!

It's fun to listen to people talk about stuff that I used to know a little about. Gets the brain going. I'm also enjoying your solar thread.

 

[k0ua]

Moss, here are the "twins" I referenced in the PM I just sent you. I did finally get the guy in Belarus in the log.

Still listening to the guy in Kuwait. YOu can see the frequencies on the display.
View attachment IMG_20190117_230933842.jpg

 

[k0ua]

At my old employer we had several cheap sets of PC speakers that would pick up the local radio station that transmitted from a couple blocks over. It was weird.... the radio programming, not the phenomenon. :laughing:

A mix 31 split bead ferrite with the power lead wrapped thru it a few times and the lead from the non powered speaker to the powered speaker would likely have gotten rid of that problem in about a minute. Or possibly a mix 73 might have been a bit more effective at those lower frequencies.

Here is a photo of one of my monitors power cord wrapped several times thru a split ferrite snap on.

View attachment IMG_20190117_232257654.jpg

 

[k0ua]

Reading threads like this is eye opening as to how much I don't know!

one way to learn is to ask questions of others.

 

[Ken]

one way to learn is to ask questions of others.

Around the year 1965 the gas pipe line company I was working for decided that with the break up of the telephone company and our use of the Watts line and telemetering of control and pressure readings of compressor stations . That the need of reliable communication was needed . they purchased a 100 k.w. RFL brand SSB. of transmitter and receiver radios. we installed them at each compressor station and tested them with call sign and Testing 1234. And received answers from East Texas power company's on same Frequency . wondering who we are and why using there air space. But we had a hard time talking to station 100 miles away. we were legal. licensed to use this space but FCC developed a hard nose of why using the freq. so changed to another frequency . then one day a supervisor walking past the transmitter/receiver saw one of the 2 tubes was not glowing and asked why .technician answered operating on SSB .which satisfied the person but then he quickly exchanged the faulty tube.
ken
Life was good when things were easily repaired.