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100MHz ground plane antenna - Here you can find plans for a
simple ground plane antenna that works well in the FM Band
(88-108MHz). It's built of a small plastic disk…(added 04/05/06)
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15dB UHF TV Antenna Booster - This is an UHF band TV antenna
preamplifier circuit With 15dB gain to build easily. It is formed
based on BF180 UHF Transistor. The first stage is an band pass filter
constructed by the C1, CV1, L1, L4, C7 and C3, the second stage is a
base-common…(electronic design added 08/08/08) |
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5/4 Wave 2 Meter Antenna - This month I decided to build a 2
meter 5/4 wave antenna. This antenna is unique in that it is
enclosed entirely in 3/4" PVC which makes the design a little more
complicated. The primary problem is that PVC tubing has a significant
velocity factor which causes RF to slow down. This means that an
antenna encased in PVC will normally need to have it's physical length
reduced by about 19%. To further complicate the design.... [Radio
Amateur Society of Norwich] |
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6 x 6 Loop Antenna - This new loop antenna is his best design yet and I am
proud to be the first to present his work. It uses one, six foot square, six turn
loop, and is aperiodic in nature, covering the frequency range 50KHz, 5000KHz....
[Design by Graham Maynard] |
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70cm Collinear Antenna From Coax - Recently the RASON technical committee
was hard at work at the repeater site 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. While it is not always feasible to home-brew a
commercial quality antenna designed to take hurricane force winds, it is very feasible
to built a collinear antenna for average use. This article describes a collinear
antenna made from very inexpensive RG58/U coaxial cable and encased in PVC pipe....
[Radio Amateur Society of Norwich] |
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A compact L-match ATU for portable use - amateur radio construction
projects…. [from Peter Parker's website] |
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A magnetic loop antenna for 160 to 15m - amateur radio construction
projects…. [from Peter Parker's website] |
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A magnetic loop antenna for 40 to 17m local & DX contacts from tight spaces -
amateur radio construction projects…. [from Peter Parker's website] |
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A magnetic loop antenna for 80 and 40 metres - amateur radio construction
projects…. [from Peter Parker's website] |
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A QRP DX antenna - amateur radio construction projects…. [from Peter
Parker's website] |
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Active Antenna - An antenna with an integrated RF pre, amplifier ….(design
added 11/08) |
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Active Antenna AA-7 HF/VHF/UHF, 3-3000MHz - If you have a shortwave or
high-frequency receiver or scanner that is struggling to capture signals with a short,
whip antenna, and you'd like the kind of performance that a 60-foot 'longwire' antenna
can provide but lack the space to put one up, consider building the AA-7 HF/VHF/UHF
Active Antenna described in this article.….(Circuit design added 11/08) |
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Active Antenna for AM-FM-SW - This simple little circuit can be used for AM,
FM, and Shortwave(SW). On the shortwave band this active antenna is comparable to a 20
to 30 foot wire antenna. It is further more designed to be used on receivers
that use untuned wire antennas, such as inexpensive units and car radios.... [Tony van
Roon's circuit] |
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Active Antenna, easy to build - When fate or nasty neighbors prevent you
from stringing a long-wire receiving antenna, you'll find that this pocket-size
antenna will give the same, or even better, reception. This "Active Antenna" is cheap
to build" and has a range of 1 to 30Mhz at between 14 and 20dB gain.... [Tony van
Roon's circuit] |
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Aerial Tuning Unit - A simple passive (no power required) circuit to match
an antenna to a radio receiver. This will be a useful addition to the short wave
listener, but in addition a medium wave coil is almost used to tune the medium wave
band…. [Circuit by Andy Collison] |
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An automatically tuned HF mobile antenna - This elegant design covers the
complete spectrum from 7 to 30 MHz at less than 1.3:1 SWR, is compact, very
weatherproof, robust and has good performance. This article was first published
in the QEX / Communication Quarterly magazine. The article comes in five pages, with
lots of photos, mechanical drawings, schematic diagram, PCB layout and software
listing. Exact duplication is not for the faint of heart, but some of you may find
individual parts and ideas useful for your own projects! [Manfred Mornhinweg] |
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Antenna Tuning Unit - A simple passive (no power required) circuit to match
an antenna to a radio receiver. This will be a useful addition to the short wave
listener, but in addition a medium wave coil is almost used to tune the medium wave
band….(circuit added 12/2009) |
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Antennas for the space-restricted - amateur radio construction projects….
[from Peter Parker's website] |
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ATL3 Loop Antenna (Graham Maynard) - All ATL-3 loop windings are centre
tapped and balanced w.r.t. their amplifier/receiver chassis ground, and therefore
electric field interference pick up tends to self cancel. Magnetic noise fields,e.g.
televisions and the electric meter box, or....(design added 8/03) |
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YAGI UDA Antenna - (circuit added 7/02) |
