Showing posts with label Dipole. Show all posts
Showing posts with label Dipole. Show all posts
Wednesday, March 7, 2018

Out of all antennas I installed and used at my (antenna-restricted) OTH the one I liked instantly was MFJ "hamstick" dipole(s): the size, the ease of installation, the way it could be rotated manually -- fiberglass mast I use allows it -- and how the signal/noise changes with the rotation. There were problems with the hamstick dipoles though: they turned out not very good radiators, the one for 20m is better than for 40m, but generally all poor and lossy. The little modeling I've done confirmed it. Also, hamstick dipoles I have are low power (125W max).

So...I went on the quest for finding a rotatable dipole which
(1) would fit in my small patio,
(2) could be installed on the fiberglass mast I have and
(3) could handle at least five hundred watts of (recently installed in the shack) Elecraft KPA500.

I came back last week with MFJ-1775 multiband (10-15-20-40m) rotatable dipole, assembled it, tuned and tested during the 2018 ARRL DX SSB Contest this weekend. Here are my impressions:

Thursday, December 7, 2017

Been a new ham, I build all kind of antennas; in a process of doing this I accumulated long list of internet references I am sharing below. I will be updating it, deleting old/outdated/not important references and adding new. Due to my present QTH the main focus is compact/limited space antennas, but the list is not strictly limited to this subject. It is a bit chaotic as it originates from the text file I have been dumping my findings to for many month, but proven to be useful, so here it is:


TOPICS

last updated Mar 01, 2018


ON ANTENNA TRAPS

YAGIS

DIPOLES AND DOUBLETS

LOOPS

ZEPPS AND J-POLES

VERTICALS

WIRE ANTENNAS

TOOLS, TIPS AND STUFF

Unsorted...


        HF Beacons, transmission schedule
        https://www.ncdxf.org/beacon/index.html#transmission

	Isotron compact 40m antenna
	 http://isotronantennas.com/index.php?main_page=product_info&cPath=1_4&products_id=4

	Hentenna
	 http://www.hamuniverse.com/hentenna.html
	 http://www.hamuniverse.com/6mhenk5uss.html
	 http://www.hamuniverse.com/iw6dfw%202m%20and%2070cm%20hentenna%20project_DRAFT.pdf

	Wire
	 https://www.amateurradiosupplies.com/category-s/260.htm
	 http://thewireman.com/index.html

	Antenna tuners
	 http://www.sgcworld.com/store/index.html

	LDG antenna tuner
	 http://www.ldgelectronics.com/c/252/products/17/49/4
	 the one with batteries: http://www.ldgelectronics.com/c/252/products/17/9/1

	Ugly balun
	 http://www.hamuniverse.com/balun.html
	 https://www.dxengineering.com/parts/dxe-8x
	 https://www.dxengineering.com/parts/dxe-pl259