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These waves would be transmitted all around that point distributed as sphere. One insight that may help non EE educated people understand what an antenna does: The simplest form of an antenna would be just a simple point emmiting electromagnetic waves. He discusses at some length how, even at HF, variations in polarization of arriving waves can vastly influence the received signal legibility. There is a long, fruitfull discussion of the reciprocity properties of receiving and transmitting antennas. On the low bands, including our new allocations at 630 and 2,200 meters, heavy emphasis on the receiving end of these radio paths is essential for success. There are relatively few cases where a radio amateur cannot benefit from a separate, well-designed receiving antenna or antenna system. Receiving Antennas for the Radio Amateur focuses entirely on active and passive receiving antennas and their associated circuits. 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.Transmitting and receiving antennas have different jobs to do.Īlthough the fundamental characteristics of antennas apply to both transmission and reception, the requirements and priorities of receiving antennas can be vastly different from those of transmitting antennas. The DBJ-1: A VHF-UHF Dual-Band J-Pole by WB6IQN Slim Jim 433 MHz hand held antenna by LY3LP Quarter wave vertical antenna's for 2-Meterband, 70cm. Here’s a base station antenna you can easily build for 146, 220 or 440 MHz.Ī J-pole, but it’s smaller, less obtrusive and more Homebrew Coaxial Dipole for VHF or UHF by W6NBC Generally speaking, this is a dual band design focused with better performance on UHF. One of the members commented to me that I should write an article about collinear arrays so that we could all build our own. Recently the RASON technical committee was repairing our 2 meter repeater antenna.
#OMNIDIRECTIONAL VLF RECEIVER ANTENNA PORTABLE#
Why settle for the performance your rubber duck antenna offers?īuild this portable J-pole and boost your signal for next to nothing!īuild A 9 dB, 70cm, Collinear Antenna From Coax by N1HFX 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.Īn Easy Dual-Band VHF/UHF Antenna by KD6GLF Again the design was choosen as portable as possible.Ī Simple 2 m/70 cm Vertical Dipole Antenna by KGØZZ This little aerial was intended to make it easier for me to connect to the local packet-radio digipeater and to work the various phone and multimedia repeaters. I thought it would be nice to chat with some local radio amateurs on my way back home. Die ik als referentie gebruikte.ĭuring the summer season I sometimes travel to work by bike. Ik had nog een exemplaar liggen van 10mm diameter aluminiumpijp. Tijdens de kerstdagen heb ik een J antenne voor de 70 cm band gemaakt van 1.5mm koperdraad om de antennespanningsmeter uit te proberen. With the view of doing satellite operations with a simple non-steerable antenna a number of antenna designs are being reviewed and many of them will be revisited in search for the optimum simple satellite ground station configuration. This antenna is structurally simple, but adjustment is surprisingly difficult, so this antenna is for those who are slightly used to it.Ĥ35MHz 1/4λ ground plane tower mounted antenna by VK6YSF It is also an ideal low-cost ham radio club project.ģ-band whip antenna 144MHz, 430MHz & 50MHz by JA1HWO Use it forīetter coverage at a parade, a bike-a-thon or just on a stroll.Īlternately, hang it in a tree or mount it permanently. Walk about freely with this pedestrian-portable antenna. Het kan beschouwd worden als een hele golf (1λ) dipool waarvan de helft (= ½λ) opgevouwen is.Ģm/70cm Gentleman's Walking Stick by W6NBC & W6ND 2m/70cm Fietspomp Antenna Voor Binnenshuis door PAØFRIĭe werking van een fietspompantenne is te vergelijken met dat van een ZEPP antenne.