Adding topband to a full sized elevated 80m vertical and putting N6LF’s QEX data to the test
This antenna started out as an 80m vertical – with160m capability added as a secondary consideration. In reflection, I’m very glad to have added the 160m operation as that is a fascinating band.
It’s now on it’s second version (v2), with a conversion from a trap-based to relay-based band selection and full matching net now complete.
From the diagram, you can see that 50 ohm feed line runs to the 2×6 switch (mounted on a tower about half way to the vertical), and from the switch onward to the vertical, it’s 75 ohm RG-11. The LC network is a few feet below the vertical’s base. It’s an elevated structure, with 10 elevated radials at head-height. A control line runs from the shack to the vertical allowing some relay switching which engages the cap hats to shift the resonant point of the vertical from 80m to 160m – and to likewise set the L/C for the band in operation….. READ MORE
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8 EL. DELTA LOOP 144 MHz (144DL8) – SMARTECH
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“As we mentioned in our press release today, we are super excited to share that we have hired John Stanford as the newest member of our leadersh... Read more
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Carefully selected, these first two antenna anthologies cover all types of antenna designs and theory from 160 meters through microwaves. All articles... Read more
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TETRA 15-17-20-40 m – Yagi Antenna
Specifications Frequency MHz: 21~21,45 – 18,06~18,17 – 14~14,35 – 7~7,3 Active elements: 4 (15m) / 3 (17m) / 4 (20m) / 3 (40m) Gain dBi*: 14,8... Read more
New Hy-Gain Dual Band 4 Element 6/4m
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The AMSAT SA 2 m / 70 cm dual-band Yagi antenna is now available
The antenna has a 50-ohm designed driver. The Yagi has a unique element called a ‘Open Sleeve’ which is a director very close to the driven element... Read more
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