On Mar 17, 1:07*pm, RHF wrote:
On Mar 17, 5:36 am, joe wrote:
- - RHF -wrote-
- - Tom-K-in-LA,
- -
- - First lets take a look at the two Shortwave Listener Antennas :
- - { Lets Reason Things Out form a Practical Point of View. }
- -
- - Situation : Sony AN-LP1 Active Loop Shortwave Antenna
- - -versus- RF Systems T2FD {Passive} Shortwave Antenna
- - that is rolled-up and placed on the same Window as the
- - Sony had been located in an Apartment.
- -
- - The Sony AN-LP1 Active Loop Shortwave Antenna is an
- -http://www.universal-radio.com/catalog/sw_ant/3676.html
- - "E" Probe type of Antenna using a relatively small size
- - Antenna Element* and an Impedance Matching Amplifier
- -
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
So under this 'screen-name' of "Joe" you have a total of
Five (5) posts here since March 4 2008. *Which leads
me to believe that you are a Sock-Puppet for some one
else who frequents the RRS Newsgroup.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
=WRT= T2FD Antenna Experts Please Chime Inhttp://groups.google.com/group/rec.radio.shortwave/msg/a0e82457c7f6094c
Joe -wrote- "A loop antenna is NOT an e-probe."
Joe,
The Electric-Field "E" Probe View-Point
"It can be rigged as a VERY directional E probe"http://www.radiocom.net/
The Magnetic-Field "H" Probe View-Point
"The Broadband Loop is balanced antenna and responds
primarily to the magnetic-field, this ensures high rejection
of nearby electric-fields. The intensity of the electric-field
is usually higher than the magnetic-field when an antenna
is close to interference sources"http://brneurosci.org/radio-misc.html
"The Loop antenna responds primarily to the Magnetic-Field
and rejects locally radiated Electric-Field noise providing far
lower noise reception than active whip/dipole antennas."http://brneurosci.org/radio-misc.html
1 - Either way the Single Turn Loop Antenna Element
that is a small Fraction of a Wave-Length Long is a
"Probe" type of Antenna.
2 - When that Loop Antenna Element is 'connected' to
an Amplifier {Active} placed directly at the Element; and
that Amplifier is 'connected' to a Coax Cable feed-in-line :
The Resulting Antenna is an Impedance Matched and
Amplified "Probe" type of Antenna.
3 - Sony AN-LP1 Portable Active Antenna could be
called a Narrow-Banded {Un-Tuned} Loop Antenna.http://cgi.ebay.com/_W0QQitemZ140214066985
The Control Box is equipped with a Frequency Band
{Narrow Range} Selection Knob : ~4 MHz, ~5 MHz,
~6 MHz, ~7 MHz, ~10 MHz, ~12 MHz, ~14 MHz,
~16 MHz, and ~20 MHz *This Knob {Switch} allows
the Selection of any of these Bands which cover the
major Shortwave Radio Broadcast Bands. *It generally
the Sony AN-LP1 Amplifies "All" the Frequencies
within these Narrow Bands and Attenuates the
Frequencies that are out of the specific Band.
Note - There is NO Fine-Tuning within the Bands.http://www.universal-radio..com/cata...nt/3676pre.jpg
That-Something-Extra -Read- Joe Carr's Radio Tech-Notes
"Small Loop Antennas" -by- Joseph J. Carrhttp://www.dxing.com/tnotes/tnote08.pdf
=WRT= T2FD Antenna Experts Please Chime Inhttp://groups.google.com/group/rec.radio.shortwave/msg/a0e82457c7f6094c
Joe -wrote- "Rest of nonsense deleted." - Nonsense* ?
* ? Question Joe - How is this Nonsense ?
The Sony AN-LP1 Active Loop Shortwave Antenna is anhttp://www.universal-radio.com/catalog/sw_ant/3676.html
+ Antenna Element : 19" x 3.14 = 60 Inches ~ Five Feet of Wire
+ Signal Capture Area : (19"/2)^2 x 3.14 = 283.4 Square Inches
~ Two Square Feet
* ? Question Joe - How is this Nonsense ?
The RF Systems T2FD is a Passive (Non-Amplified)http://www.rf-systems.nl/pdf/t2fd.pdf
Shortwave Antenna that measures about 45 Feet Long
Tip-to-Tip and about 18 Inches (1.5 Feet) Wide Top-Wire
to Bottom-Wire; and has about 93 Feet of Wire up in the
Air with a Signal Capture Area of 45 x 1.5 = 67.5 Sq. Ft.
* ? Question Joe - How is this Nonsense ?
The T2FD Antenna is relatively large and it's Signal Capture
Area is relatively Big -with-respect-to- the Sony AN-LP1;
* ? Question Joe - How is this Nonsense ?
the T2FD Antenna produces a relatively strong level of
RF Signals; and the T2FD Antenna does not require an
Amplifier to provide good RF Signal Levels to a *Radio /
Receiver. -P R O V I D E D- That the T2FD Antenna is
Stretched-Out-Fully and Up-in-the-Air.
* ? Question Joe - How is this Nonsense ?
Tom-K - Your situation has the T2FD Antenna Rolled-Up*
placed in a Window; with may be a *Signal Capture Area
of about 3-Feet-by-3-Feet = 9 Square Feet. *The Wires
of the T2FD Antenna are not stretched-out froming a Loop
-but- Rolled-Up froming four Coils.
* THIS AIN'T A T2FD - It is a HodgePodge of Crossed Wires
-aka- MishMash of Wires with crossed RF Signal Paths.
* ? Question Joe - How is this Nonsense ?
Take the time to 'find' the best Window in your Apartment
that the Sony AN-LP1 Active Loop Shortwave Antenna
works in : Best Signals and Lowest Noise.
* ? Question Joe - How is this Nonsense ?
Question ? Is your Window Sill and Window Frame Metal ?
or Painted / Plastic / Wood Covered Metal ? :
1 - Then keep the Sony AN-LP1 Active Loop Shortwave
Antenna centered in the Window and away from the Metal.
2 - Then keep the Wires of the RF Systems T2FD Antenna
at least 3~6 Inches away from the Metal.
* ? Question Joe - How is this Nonsense ?
First - Nine (9) Square Feet of Signal Capture Area is a
Fraction (1/7th) of 68 Square Feet and you should
Not Expect the same RF Signal Levels.
* ? Question Joe - How is this Nonsense ?
Second - The Wire Antenna Element is no-longer a
physically shaped balanced Loop (O) -but- a jumble
of Crossed Wires and Signal Paths.
* ? Question Joe - How is this Nonsense ?
Third - The Wire Antenna Element is no-longer Out
In-the-Air and away from the Homes Envelope of
Man Made Noise : The Wire Antenna Element is
Inside the Appartment and within the Buildings
Envelope of Man Made Noise.
* ? Question Joe - How is this Nonsense ?
Result : Lower RF Signal Levels plus Higher RF Noise Levels.
joe - hope that his reply ain't nonsense - iane ~ RHF {pomkia}
*.
Shortwave Listener (SWL) Antennas Group =http://tinyurl.com/ogvcf
GoTo =http://groups.yahoo.com/group/Shortwave-SWL-Antenna/
*.
RHF's Standard "Shortwave Listener (SWL) Antennas Group"
For a Reduced Message Signature Line Reference Messagehttp://groups.google..com/group/rec.radio.shortwave/msg/411dac3b4a1798e0
*.
Joe -= F Y I =- This "Fisking" was
brought to you by a 'real' FISK ~ RHF
http://en.wikipedia.org/wiki/Fisking