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VK2ZRG > AERIAL 08.01.04 02:22l 19 Lines 884 Bytes #999 (0) @ WW
BID : 41368_VK2TGB
Read: GUEST
Subj: Re Biconical HF antenna
Path: DB0FHN<DB0RGB<OK0PPL<DB0RES<ON0AR<7M3TJZ<ZL2TZE<VK2BNR<VK2TGB
Sent: 040108/0139Z @:VK2TGB.#SYD.NSW.AUS.OC #:41368 [Valley Heights] FBB7.00g
From: VK2ZRG@VK2TGB.#SYD.NSW.AUS.OC
To : AERIAL@WW
Hello Ruben and readers
Sorry I can't tell you much about the bi-conical for HF. (I assume by 7mhz
you mean 7 MHz...7 millihertz is awfully low). I have seen pictures of UHF
bi-conicals and I may have some info on these but would have to search for it.
Have you considered a discone antenna? These can be made to work over a 7:1
frequency range with VSWR under 1.5:1 There is a discone design for 7 MHz to
30 MHz, in the ARRL Antenna Handbook, 16 th and 17 th editions (and possibly
other editions). The original design appeared in QST for July 1975.
I have also seen an inverted HF discone (the disc is closest to the ground).
It was made in skeleton form with wires and many insulators. It used a taller
mast than for the normal discone. I think there was some advantage in the
radiation angles.
73s from Ralph VK2ZRG
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