[Antennas] BCB Loop Antennas

2002年9月27日 14:49:27 -0400

This type of loop technology for MW BCB has been around for quite a while.
It has changed little over the years..
When I was a kid, we had a large bakelite circle wound internally with
literally hundreds of feet of enameled wire. Dark brown and about 3 feet in
diameter, with gold foil labels. The bottom had four legs on its outside
and a flat shelf within the very bottom of the loop for the radio itself to
sit on. The entire contraption occupied a medium sized table in the living
room. The bottom shelf contained a pair of tuner controls (cap & inductor)
which I remember well because... one afternoon at the tender age of about 8,
I took it apart to see what was inside and could not get the halves back
together before my dad and grandfather got home. The result was a bit of
difficulty sitting for a few days. Some lessons we remember VERY well.
The loop antenna was eventually repaired and put back into service..
It was, even by the fashion standards then, an ugly device. Neighbors
scoffed at it UNTIL you placed your table radio inside the loop... then
their faces glowed as static disappeared, the signal improved, and the music
and voices became a wonderfully deep and mellow.
Folks who had the 'tuning eye' table radios of the day brought theirs over
to prove that the glowing panel 'eye' ( a tube of sorts) really did work
with a good enough signal... We were, in NYC, able to easily tune and
clearly hear AM stations from Chicago, St. Louis, and Cincinnati.
The device was, I believed, labeled "Dumont Miracle Antenna". My
grandfather also had one of the Dumont MW/SW console radios - actually two
separate radios plus a 5" TV in the top. .. beautiful piece of wood
furniture with fantastic inlay work AND a great sw radio. The SW radio
portion had about 100' of very thin enamel wire for an antenna that was
strung around the room, over door ways and curtain rods. Later on I
remember him having another Dumont TV and record player. I'm guessing we
had a Dumont employee in the family - but no one seems to remember.... I do
wish I still had all that stuff today.
73
Frank
._._.
----- Original Message -----
From: "David Kelley" <[email protected]>
To: <[email protected]>
Sent: Friday, September 27, 2002 2:15 PM
Subject: Re: [Antennas] BCB Loop Antennas
> At 04:01 AM 9/27/2002 -0400, you wrote:
> >For BCB, a loop receiving antenna can be as simple as a
> >tuned circuit (consisting of a coil, which is the loop
> >itself, in parallel with a variable capacitor) resonant
> >at the received frequency. One side of that circuit is
> >connected to ground, and the other side is connected to
> >the antenna input. Alternatively, a BCB receiver with
> >a builtin loopstick antenna may simply be placed inside
> >the loop, without any wires connecting the loop's tuned
> >circuit to the receiver--simply orient the receiver for
> >maximum received signal, once the variable capacitor has
> >been tuned for the intended frequency.
>> I can confirm that this trick works. I tried it a long time
> ago with a table-top AM radio.
>> 73,
> Dave NB4J
>> --
> Dave Kelley, NB4J
> Lewisburg, PA
> Union County
>> - - -
>> Your moderator for this list is:
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