A classic by now deceased James Cunningham: http://home.comcast.net/~filebay1/pdf/tbab.pdf
Interesting read.
Thanks for sharing.
Bruce.
Every year at this time a parade of ants has a secret way of invading the bathroom. They don't bother me and I don't bother them. After two weeks of re-mapping everything they leave until next year.
But I'll tell you this, I think they are attracted by all my antennas.
No, I don't have antennas in the bathroom, but think of all the grounding in there! Grounding is the earthly part of any antenna, and the ants pick up the RF from underground.
It's obvious.
RE: Post #1 of this thread...
A classic by now deceased James Cunningham: http://home.comcast.net/~filebay1/pdf/tbab.pdf
A classic in what sense?
Information/guidance in that document could lead those who accept it into violation of Part 15 -- which might be of interest to some readers, and some operators of "Part 15" systems.
Education is education. It depends on how you use that education. Some of us could eventually be involved with a licensed station at some point in our lives.
Okay, I'm too old to go to engineering school and get employed as 'such' upon graduating from that course, but there are others out there who visit here that are already engineers and can use that information, or there are those who might download that and save it for when they do graduate.
That publication does not tell terrorists how to make bombs or how to take lives using terrorist tools, it explains how antennas work for broadcasting.
There are a lot more harmful things that can be constructed simply by reading the ARRL antenna handbook.
Bruce.
Absolutely, what was just said by MrBruce, although I disagree about being "too old" to do anything. Every once in awhile an older person signs up for a college course, and they are made to feel very welcome by the other students and faculty, and where radio engineering is concerned, there's a shortage now, making it the perfect time to become available.
As to the Classic by James Cunningham, believe it or not the part 15 community is able to discern between scholastic material written for the licensed radio student compared to the whole other scaled-down language for part 15 radio.
Talking down to us gains little confidence in what the objector might be trying to imply.
RE: Reply #6 in this thread...
As to the Classic by James Cunningham, believe it or not the part 15 community is able to discern between scholastic material written for the licensed radio student compared to the whole other scaled-down language for part 15 radio.
Talking down to us gains little confidence in what the objector might be trying to imply.
To the objectee in Reply #6:
"Talking down" is just a retort for those hoping to deflect the truth.
However a more accurate reading/comprehension of Cunningham's comments and graphics will show that he is describing transmitter systems using a coax cable connected between the transmitter and an elevated antenna, and using long, radiating "ground wires" between the transmittter chassis and an r-f ground.
Cunningham even recognizes that the "ground wire" he describes produces most of the radiation from such systems (see page 10 of his paper). Sound familiar?
None of this is supported for unlicensed systems by the FCC. Such systems have been cited by the FCC for non-compliance with Part 15.
In the classic BIG ANTENNA BOOK by the late James R. Cunningham virtually all aspects of antennas are discussed, including those for mere Part 15 stations (pages 8 & 15), carrier current stations and the universal matter of grounding (page 91). THAT is why the book earns the designation of CLASSIC.
Don't be jealous.
Anyone seriously involved with Part 15 radio broadcasting should print and cherish this brilliant compilation on the whole overview of AM and FM antenna technology.
Of course I know there are technical inaccuracies contained within. I know that the FM band does not allow 100 mW. I don't know when the book was published. Just like other sites, there is always someone lurking to pounce on anything. Maybe I should have posted a link to the ARRL Antenna Book which also contains nothing relative to Part 15 operation, and includes technical inaccuracies. Is everyone here now happy?
John, I am glad you posted it. We can spot inaccuracies and read around them, same way everyone does with the Bible.
There may not be talking snakes but we still use the Bible to dimininish the status of women, impose slavery, justify righteous killing, and practice genocide.
For its sloppy composition and sketchy disorganization we still thump on the Part 15 Rules.
Imperfection is a way of life.
Reply to post #9
John I am glad you posted a link to that article.
It is what I call educational information.
The same reasons we read publications such as Radio World. I used to subscribe to Radio Electronics years ago because that magazine had a wealth of information and offered plans on how to make home brewed kits for various purposes. Kits in my opinion, offer an education on how things actually work.
I see no harm done in publishing anything educational as long as it does not involve the loss of life.
Bruce.