Thanks Drew,
I thought for some reason it was behaving like a dipole. At short
lengths more boradside to the antenna and as it gets longer the lobe
gets smaller and more pointing towards the end of the wire.
Now, a BOG.
if you do NOT terminate it, does it behave like a Rohmbic where it's Bi
directional?
BOG does the wire need to be insulated? or can it be bare/
Joe
WB9SBD
On 8/1/2019 2:27 PM, Drew Vonada-Smith wrote:
Joe,
For a simple Beverage, you just point the antenna (unfed end) at the target. For length,
"longer is better" is approximately true, but the ideal lengths are about 1 to
2 wavelengths. Much longer than that, and phased shorter Beverages work better. Much
shorter than that, and you might as well use some other type of RX antenna. One Bev can
work pretty well on both 160 and 80, and will occasionally be useful on other bands also.
During spring/summer precip static, common in KS, the Bev is often my only usable RX
antenna on ANY HF band!
A Beverage has negative gain. But you don't care about absolute strength, you
only care about S/N, as any modern radio has enough gain on 160M for the
smallish Beverage signal to be fine. Some, like me, use a preamp just so the
various RX antenna gains are approximately equal when switching between them.
A 15 dB preamp brings my 600 ft Bev signal strengths to the level of my TX
Inv-L on 160. But you don't need it.
Beverages are not in the great favor they once were, mostly due to the advent
of excellent vertical arrays. But they still have the big advantage of being
the simplest RX antenna one can imagine, that nearly always works as described
without difficulty, assuming you have the space. And cheap!
Reversible Beverages are only slightly more complicated and give you another
direction with no more space required. Lots of good articles out there for a
Google.
73,
Drew K3PA
________________________________
------------------------------
Message: 18
Date: Thu, 1 Aug 2019 13:25:25 -0500
From: Joe <nss@mwt.net>
To: Wes <wes_n7ws@triconet.org>, topband@contesting.com
Subject: Re: Topband: BOG height
Message-ID: <cb0a992a-8c3a-ebf7-6925-180fae8c0dba@mwt.net>
Content-Type: text/plain; charset=utf-8; format=flowed
beverages have always fascinated me. But I have never had the property
to have one.
I might now, BUT, how do you know how long and what direction to lay it
out to maximize signal to the desired direction?
I assume the longer it is, the higher gain it has and more towards the
ends the lobe is?
Joe WB9SBD
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