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70cm Projekten - Rondstralers

Klik voor vergroting2m/70cm Fietspomp Antenna Voor Binnenshuis door PAFRI
De werking van een fietspompantenne is te vergelijken met dat van een ZEPP antenne. Het kan beschouwd worden als een hele golf (1λ) dipool waarvan de helft (= λ) opgevouwen is.
https://pa0fri.home.xs4all.nl/Ant/Indoor%202m-70cm%20sleeve%20ant/Binnenshuis%20fietspompantenne%202m-70cm.htm

2m/70cm Gentleman's Walking Stick by W6NBC & W6ND
Walk about freely with this pedestrian-portable antenna. Use it for better coverage at a parade, a bike-a-thon or just on a stroll. Alternately, hang it in a tree or mount it permanently. Its utility will impress you. It is also an ideal low-cost ham radio club project.
http://w6nbc.com/articles/2013-1QSTwalkingstick.pdf

440MHz J-Pole Antenna Plans by WB8ERJ
Here is a 70cm (440 Mhz) J-Pole antenna that is inexpensive, and easy to build. I use 1/2 inch copper pipe, and the associated fittings necessary. The dimensions arent typical however, this is what it took to get its SWR low.
http://www.mikestechblog.com/joomla/component/content/article/43-ham-radio-antennas/62-70-cm-440-mhz-j-pole-construction-plans.html

70 Cm J Antenne door PE1KQP
Tijdens de kerstdagen heb ik een J antenne voor de 70 cm band gemaakt van 1.5mm koperdraad om de antennespanningsmeter uit te proberen. Ik had nog een exemplaar liggen van 10mm diameter aluminiumpijp. Die ik als referentie gebruikte.
http://pe1kqp.radiotreffen.nl/index.php?page=70-cm-j-antenne

Klik voor vergroting70cm bicycle antenna by PA3HCM
During the summer season I sometimes travel to work by bike. I thought it would be nice to chat with some local radio amateurs on my way back home.
http://www.pa3hcm.nl/?p=819

Klik voor vergroting70cm Big Wheel Antenna by DL4MEA
This is a 70cm big wheel antenna which is needed for our beacon DB0FAI. The enclosure is a carrying case for cakes. This antenna was originally described in the "VHF Communications".
http://www.qsl.net/dl4mea/antennas/bigw.htm

Klik voor vergrotingA Halo 4 Stack For 70cm On The Cheap by KR1SThttp://www.kr1st.com/70cmstack.htm

A Parasitic Lindenblad Antenna for 70cm by AA2TX
This paper introduces a novel and considerably simpler way to construct a Lindenblad style antenna. It uses a single dipole, driven-element along with a passive, parasitic, circularpolarizer. The single driven element is designed to provide a 50-ohm load and the circular polarizer is very easy to build.
http://ww2.amsat.org/wordpress/wp-content/uploads/2014/01/70ParaLindy.pdf

Klik voor vergrotingA Simple 2 m/70 cm Vertical Dipole Antenna by KGZZ
This easy to build dual band VHF/UHF antenna makes a great project for the new ham that is ready to get on the 2 meter and 70 centimeter amateur radio bands.
http://www.amateurradio.bz/2m-70cm_vertical_dipole_antenna.html

An Easy Dual-Band VHF/UHF Antenna by KD6GLF
Why settle for the performance your rubber duck antenna offers?
Build this portable J-pole and boost your signal for next to nothing!
http://www.arrl.org/files/file/Technology/tis/info/pdf/9409061.pdf

Build A 9 dB, 70cm, Collinear Antenna From Coax by N1HFX
Recently the RASON technical committee was repairing our 2 meter repeater antenna. One of the members commented to me that I should write an article about collinear arrays so that we could all build our own.
http://www.rason.org/Projects/collant/collant.htm

Home Brew dual band antenna by VE3RGW
Generally speaking, this is a dual band design focused with better performance on UHF. It can satisfy needs on most situation.
http://www.qsl.net/ve3rgw/uvant.html

Homebrew Coaxial Dipole for VHF or UHF by W6NBC
Heres a base station antenna you can easily build for 146, 220 or 440 MHz.
Performance is equal to a J-pole, but its smaller, less obtrusive and more weatherproof.
http://w6nbc.com/articles/2009-07QSTcoaxialdipole.pdf

J-POLE for VHF/UHF by ON6MU
VHF/UHF J-Pole Vertical Antenna
http://users.belgacom.net/hamradio/schemas/jpole.gif

Quarter Wave Antenna by ON6MU
Quarter wave vertical antenna's for 2-Meterband, 70cm...
http://users.belgacom.net/hamradio/schemas/kwartgolf.gif

Klik voor vergrotingSlim Jim 433 MHz hand held antenna by LY3LP

http://sa555.blogspot.com/2012/06/slim-jim-433-mhz-hand-held-antenna.html

The DBJ-1: A VHF-UHF Dual-Band J-Pole by WB6IQN
Searching for an inexpensive, high-performance dual-band base antenna for VHF and UHF? Build a simple antenna that uses a single feed line for less than $10.
http://www.arrl.org/files/file/Technology/tis/info/pdf/0302038.pdf

Klik voor vergrotingThe simplest dual band antenna for 145 and 431 MHz by IZ3AYQ

http://iz3ayq.blogspot.com/2017/06/the-simplest-dual-band-antenna-for-145.html

Klik voor vergrotingVHF/UHF Dualband Vertical Antenna by ON6MU
I used for this antenna aluminium tubing of 10mm diameter. Or you can use a brass rod of about 7mm diameter. The top one is a strong copper (brass) wire of 5 to 7 mm diameter soldered directly to the coil and mounted to the PVC isolator to give a strong construction.
http://users.belgacom.net/hamradio/schemas/dualant.gif


Creatie datum : 08/09/2018 @ 18:03
Laatste wijziging : 30/09/2018 @ 23:28
Categorie : 70cm Projekten
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