If the rod does anything at all, it increases the effective length of
the antenna. You can accomplish the same thing by physically increasing
the wire length. And all that will do is to increase the amount of
signal -- and noise -- entering your receiver. Once you have enough
signal and noise to overcome your receiver's internal noise, there's no
advantage of any further increase, since there's no improvement in the
signal to noise ratio. Try disconnecting your antenna from your radio.
If the noise level drops when you do, you've got adequate signal
strength from the antenna, and lengthening it -- either physically or
with some kind of loading -- won't help you hear signals.

The explanation of the properties of the antenna at the distributor's
web site is wholly hype and sales marketing. It's a mismash of misused
technical terms, which means nothing and and is quite apparently
intended to mislead a potential customer and present the antenna as
having wonderful properties which it doesn't in fact have. I'd avoid
buying it for that reason if for none other.

Roy Lewallen, W7EL

RHF wrote:

FO&A,

Here is my Question: Is there any sense in putting a Ferrite Rod
at the Far-End of a Random Wire Antenna with the Wire from the
End of the Wire Antenna Element 'wrapped' around it in a
"Tuned Coil" to improve the AM/MW Band Reception ?

* Any 'theory' behind why this Idea might Work ?

* Does this Idea actually Work ?

* Or is this Idea just so much Antenna 'hype' and Sales Marketing

I am Asking these Questions is because of what I have read about
the RF Systems "EMF" Electro-Magnetic-Field Passive Wire Antenna
http://www.universal-radio.com/catalog/sw_ant/0743.html

In "John Wagner's Shortwave Tips & Tricks" he writes:
http://www.dxing.com/tips.htm
"The EMF antenna has two 35mm film canister looking objects
connected to it. The canister on the Far-End is actually an
excellent "Tuned Ferrite Rod" designed for MW (Medium Wave)
and really helps any receiver without a built in MW Antenna
Rod. Canister two (in middle) is a Balun that helps SW
reception very much."


i want to know ~ RHF
.
.

"Roy Lewallen" wrote
Once you have enough signal and noise to overcome
your receiver's internal noise, there's no advantage of any
further increase, since there's no improvement in the
signal to noise ratio.
__________________

Pardon the thread drift, but making the receive antenna directional can
improve system SNR by reducing the total noise voltage delivered to the
receiver input, as a ratio of the desired signal.

RF

Yes. My response was intentionally simplified. Making a directional
antenna is often not a viable option for an SWL, because they typically
operate over a wide frequency range, and want to receive signals from
many directions. This pretty much limits them to something like a
rotatable log periodic antenna. Wire antennas can be made directional,
but typically only in fixed or a small number of directions, and with
directional patterns that change with frequency. Within the range of
discussion, then, I don't believe it's realistic to attempt a
directional antenna. The advertised antenna certainly doesn't produce
any advantage in this regard.

Roy Lewallen, W7EL

Richard Fry wrote:
"Roy Lewallen" wrote

Once you have enough signal and noise to overcome
your receiver's internal noise, there's no advantage of any
further increase, since there's no improvement in the
signal to noise ratio.

__________________

Pardon the thread drift, but making the receive antenna directional can
improve system SNR by reducing the total noise voltage delivered to the
receiver input, as a ratio of the desired signal.

RF

(RHF) wrote in
om:

FO&A,

Here is my Question: Is there any sense in putting a Ferrite Rod
at the Far-End of a Random Wire Antenna with the Wire from the
End of the Wire Antenna Element 'wrapped' around it in a
"Tuned Coil" to improve the AM/MW Band Reception ?

* Any 'theory' behind why this Idea might Work ?

* Does this Idea actually Work ?

* Or is this Idea just so much Antenna 'hype' and Sales Marketing

I am Asking these Questions is because of what I have read about
the RF Systems "EMF" Electro-Magnetic-Field Passive Wire Antenna
http://www.universal-radio.com/catalog/sw_ant/0743.html

In "John Wagner's Shortwave Tips & Tricks" he writes:
http://www.dxing.com/tips.htm
"The EMF antenna has two 35mm film canister looking objects
connected to it. The canister on the Far-End is actually an
excellent "Tuned Ferrite Rod" designed for MW (Medium Wave)
and really helps any receiver without a built in MW Antenna
Rod. Canister two (in middle) is a Balun that helps SW
reception very much."


i want to know ~ RHF
.
.

I have a 20 foot straight wire in my garage, that works better for MW
DXing than the ferrite rods in any radio I have, due to the fact that it
is much further from any noise sources in the house. I imagine the 16
foot wire being sold there would pick up some MW, but I doubt that
adding the ferrite bar at the end helps one bit.

Thank You One and All for your Replies.

Well I have the two Inverted "L" Antennas and the proof would
be in the Doing by de-rigging one and wrapping the Antenna Wire
around a Ferrite Core; so that the Coil will be at the Top of
Vertical Up-Leg. Then doing some Side-by-Side Testing of the
two Antennas.

NOTE: Taking a second look at the RF Systems "EMF" Antenna.
The more I get the impression that it is susposed to be Rigged
as a Vertical using the Coax Cable as a Counterpoise or may be
as an Inverted "L" with the Coax Cable as the Vertical Up-Leg
and the Antenna as the Horizontal Out-Arm.

once again thank you very much one and all ~ RHF
..
..
= = = Conan Ford wrote in message
= = = .159...
(RHF) wrote in
om:

FO&A,

Here is my Question: Is there any sense in putting a Ferrite Rod
at the Far-End of a Random Wire Antenna with the Wire from the
End of the Wire Antenna Element 'wrapped' around it in a
"Tuned Coil" to improve the AM/MW Band Reception ?

* Any 'theory' behind why this Idea might Work ?

* Does this Idea actually Work ?

* Or is this Idea just so much Antenna 'hype' and Sales Marketing

I am Asking these Questions is because of what I have read about
the RF Systems "EMF" Electro-Magnetic-Field Passive Wire Antenna
http://www.universal-radio.com/catalog/sw_ant/0743.html

In "John Wagner's Shortwave Tips & Tricks" he writes:
http://www.dxing.com/tips.htm
"The EMF antenna has two 35mm film canister looking objects
connected to it. The canister on the Far-End is actually an
excellent "Tuned Ferrite Rod" designed for MW (Medium Wave)
and really helps any receiver without a built in MW Antenna
Rod. Canister two (in middle) is a Balun that helps SW
reception very much."


i want to know ~ RHF
.
.

I have a 20 foot straight wire in my garage, that works better for MW
DXing than the ferrite rods in any radio I have, due to the fact that it
is much further from any noise sources in the house. I imagine the 16
foot wire being sold there would pick up some MW, but I doubt that
adding the ferrite bar at the end helps one bit.