Antenna Bandwidth

Check the ARRL handbook.

http://www.smcelectronics.com/DOWNLOADS/1974-ARRLANT.PDF

I think you would have to test this in actual operation...and I think some corrections in length and spacing would be necessary...I don't think the gain would be effected much, but the larger diameter might increase the frequency...

http://www.eham.net/ehamforum/smf/index.php?topic=103611.0;wap2

http://www.digikey.com/en/articles/techzone/2011/mar/understanding-antenna-specifications-and-operation

http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=6905785

I think the frequency will decrease.

A yes, as written you are correct, I think I meant frequency resonance...

In my case down is good in that I'm thinking of ULF/ELF and don't have Hectars to rig a dipole across. I DO however have a tin barn so can fab a very low impedance coax from pipe and a baulan if necessary.

Consider horizontal loops...I have one that's 540ft long. Check this out...

http://www.k5rcd.org/hor%20loop%20instruct.htm

Are you trying to transmit also?? Your barn will be a fine top-hat capacitor but a very poor radiator, the balun is only there for impedance matching to the transmitter final amp.

I don't plan on transmitting on ULF or ELF, just nosing around, The Gov is doing things there. The barn roof would make a great counterpoise for a vertical, I guess it would have a very low Q but will resonate at some low frequency and provide a better receiving antenna than anything rationally else. Gawd knows what it's impedance might be.

All of your posts refer to parameters required for RF transmission, not reception. You do realize that a full wavelength VLF antenna would be about 60 miles long, anything shorter is a highly engineered compromise!

VLF receivers, on the other hand, use high gain, high impedance, highly filtered circuitry to compensate for the tiny amount of RF energy picked up by a 10-60ft long antenna. If you're handy with a soldering iron you can try this circuit.

A dipole antenna resonant bandwidth is increased if you increase the diameter. A biconical antenna is a dipole that has been "fattened" to increase its bandwidth.

http://www.schwarzbeck.de/en/antennas/biconical-antennas.html

"at its resonance with a 1/8" D element". Not antenna.

I could be wrong here.

Since the title is "Antenna Bandwidth", and he called it an element, I am assuming he is referring to elements of a Yagi antenna. I could be wrong also.

See: http://www.hamuniverse.com/yagibasics.html

"The design goal is to have the reactance at the center design frequency of the Yagi = (0),,, (j + 0).

The impedance matching device will now operate at it's optimum bandwidth. Wide element spacing, large element diameter, wide pattern bandwidth, and low "Q" matching systems will all add to a wider impedance bandwidth."

true BUT the purpose of communication is to COMMUNICATE--which it did!

Yes but, one of the problems with communication is the illusion that it has taken place.

You will find your answer in the last paragraph on page 30 of the link provided by Rixter.

Yes. As a general rule of thumb, antenna bandwidth increases as the diameter of the elements increases.

Here is a lecture on antenna theory that will probably answer a lot of your questions.

Start with the basics,and work your way up,and your curiosity will spur you on to more and more knowledge.

30 minutes,but well worth the time.

https://www.youtube.com/watch?v=JYKEZATy4Fk

SUPA! That's what I recall several decades ago when they'd just invented electronics and I went to school~~~ I'm thinking of a LARGE VLF/ULF antenna that maybe I can 'cheat' by using sheer size rather than miles of monopole,dipole/element(s).

So you want to "cheat" the laws of physics so that you can listen to submerged submarines??? Good luck, if you want any type of traditional antenna you'll need an acre or two of vacant land and some very understanding neighbors. Even so about all you can "hear" is the highly encrypted FSK signals, the bandwidth is simply too low for any type of voice or real time video transmission.

You might try looking at various amateur radio sites such as this one that is dedicated to the hobby. The antennas aren't large or complicated, the "magic" is in the DSP s/w that takes the output of a simple receiver feeding a PC soundcard and decodes it. 73's

Here is another link regarding all types of antennas,Fractal types are particularly interesting in terms of material and size reduction.

Page 104 is where the fractal section starts.

http://www.nabfastroad.org/reports/nabhighperformanceindoortvantennarpt.pdf