I think you'll find, when all the hoopla is settled down that the Miracle
whip does no better or worse than all other short whip antennas. Any whip
can work without a counterpoise. You have to define the word "work".
Bottom line is that the more metal the more capture area the better the
antenna. Period. Assuming "all thing being equal and a good match".
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----- Original Message -----
From: <g4ilo@...>
To: <FT817@...>
Sent: Tuesday, July 17, 2001 10:44 AM
Subject: [FT817] Re: Miricale whip / MFJ-1621 Portable antenna's
I have the MFJ 1621 portable antenna here. It is definitely not the
same kind of thing as the Miracle Whip, which from the QST article
seems to use a transformer. I lost the sheet of instructions that
came with the MFJ but it is basically a 4 foot whip with a built in
ATU. I think there is a variable C in series with the RF from the TX,
going into a tapped coil. The "field strength" meter is actually
pretty useless at QRP power levels, and whatever it measures, it
certainly isn't field strength. The whole thing is built to MFJ's
usual constructional standards.
It is supposed to be used with the supplied 50 foot of coax laid out
straight, which makes it not very convenient to use. The reason is
the shield of the coax is supposed to act as a counterpoise. I
shortened the coax and added a terminal to attach a separate
counterpoise or a ground connection but it is not very successful. It
seems to work about the same as the ATX, MP-1 and anything else I
tried with a 4 foot whip on it. But I don't use it to transmit as
without proper grounding or a counterpoise it is difficult to keep RF
off the radio.
The Miracle Whip should be very interesting as it appears not to need
a counterpoise, which would make it very much more convenient to use
than the other antennas, especially for the /PM guys and gals.
Julian, G4ILO
--- In FT817@y..., "Anthony " <aays888@y...> wrote:
Hi Group,
I was wondering if the Miricale whip antenna operates on the same
theory as the MFJ's 1621 Potable antenna. It looks like the 2 of
them
have got an internal antenna tuner, plus the MFJ's version has got
a
field strength meter. It would be very interesting when we get some
feed back on the miricale whip, plus has anybody had any experience
with the MFJ's-1621. 72/73's Anthony
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