HOME BREW LINKS

[kk6gun]

Since we dont have a thread really started or dedicated to home brew anything in our section of the forum, i though we should start one. Yes yes, i know that there are probably mile long threads in other portions of this forum....but this is for group interest type stuff.

Since the DONGLE is all the rage and i purchased one, and im cheap enough to not want to spend more than the dongle on its antenna; i decided to go searching for home brew wide band antennas. This initially started by looking into fractal antennas and all sorts of other cheap and weird things. When you can make a discone out of flashing material or coat hangers with a wooden insulator, it just makes things too easy.:blink:

Heres a link to a DISCONE CALCULATOR.


Online Calculator .:. Dimensions of a Discone Antenna

moxon beam calculator software

http://www.moxonantennaproject.com/design.htm

yagi calc site

http://www.k7mem.com/Electronic_Notebook/antennas/yagi_vhf.html

erp calc

http://www.csgnetwork.com/antennaecalc.html

hex beam info

http://www.leoshoemaker.com/hexbeambyk4kio/general.html

j pole calc

http://www.hamuniverse.com/jpole.html

tape measure yagis (where i found, and showed a canyon lake-tard how to build these)

http://theleggios.net/wb2hol/projects/rdf/tape_bm.htm

http://www.g6hoq.com/documents/2m tape measure yagi instructions.pdf

 

[FatHam]

and im cheap enough to not want to spend more than the dongle on its antenna...[/url]

I don't think you were cheap before you started going all MMA on people's pets...

 

[kk6gun]

I don't think you were cheap before you started going all MMA on people's pets...

I have always been cheap when it comes to antennas, but now that i broke that dog i have to be cheap as can be {Cry_river}...... oh well, i got my station in good shape prior to that and hf antennas are cheap wires usually so im stylin!

 

[KF6IRK]

What freq do you input if you want to build a multi-bander, like for the SDR dongles? (25~1300mHz) op:

 

[kk6gun]

What freq do you input if you want to build a multi-bander, like for the SDR dongles? (25~1300mHz) op:

well it asks for minimum frequency, and i had no interest in listening to 10/11m with this thing so i put in 36mhz as my minimum frequency. This will allow listening to CHP directly.

Im no expert on the way a discone works, but this is one of the few calculators ive found online that tells you how to build your own.

 

[Moleculo]

Im no expert on the way a discone works, but this is one of the few calculators ive found online that tells you how to build your own.

If you're interested, the ARRL Antenna Book (21st edition) has a whole chapter on discones, their history, how they work, and how the calculations are made. It's section 7-26 and is a pretty good read.

 

[kk6gun]

I will have to see if i can find it online. I read up on its theory after posting that last night and its just so darn simple how it works(or my twisted understanding of it). It makes sense to me now, i suppose i have a fixation with bandwidth. The log periodic, discone, biconical and some forms of butterfly antennas all work on related principles and have massive bandwidth for their relative gain.

A bi-conical dipole may be the home brew answer for me because i dont want to rotate the antenna. Otherwise i would be using a log periodic, which may still get made too.

Heres a good paper i found on a wide angle bi-conical antennas.

http://www.jpier.org/PIERB/pierb16/10.09061508.pdf