dlec
Freebander
Registered: 03-2013
Location: Germany
Posts: 28
Karma: 1 (+1/-0)
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Extended Ground Plane (over 1/4 Lambda)
This relatively flat radiant CB antenna can easily be built up with wire and works virtually on all 80 channels, SWR first Slightly shortened course, you can also use it for the 10 m amateur band. The advantage of this antenna is that it makes do with only two radials, with meaningful counterweight (balcony railings) it goes without radials. The antenna has been calculated with a professional antenna program and tested in practice. The shifting of the resonance frequency just works by changing a small piece short antenna cable.
3 = Antenna
1+3 = Radial
Koax RG58 (RG58 und RG213 is 1 pF pro cm)
27,2 MHz: 12 cm
27,0 MHz: 18 cm
26,8 MHz: 24 cm
Works with Variable Capacitor (the same)
CB 11 m:
SWR at 1.5 MHz and 26.4 Adjustment 20 cm, 350 cm and spotlights Radial 278 cm
SWR at 1.5 and 27.4 MHz adjustment 17 cm, 347 cm and spotlights Radial 278 cm
Afu 12 m:
SWR at 1.5 MHz and 24.95 Adjustment 20 cm, 371 cm and spotlights Radial 300 cm
Afu 10 m:
SWR at 1.3 MHz and 28.3 Adjustment 17 cm, 335 cm and spotlights Radial 265 cm
SWR at 1.4 MHz and 28.55 adjustment 16 cm, 265 cm radiator 332 and Radial
Ideal for DX!
Rothammel Anntena Book Page 449 (Edition 12)
Quelle: http://www.dl2jas.com/antennen/cb_balkon/cb_balkon.html [German]
Last edited by dlec, 5/Apr/2013, 11:06 am
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5/Apr/2013, 10:21 am
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topbuzzuk
Big Cheese
Registered: 11-2007
Location: Wiltshire, UK
Posts: 2655
Karma: 12 (+12/-0)
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Re: Extended Ground Plane (over 1/4 Lambda)
i love simple wire antennas, cheap but effective
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26FB118
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6/Apr/2013, 11:06 pm
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