21
MAGNETIC LOOP ANTENNA ADVANTAGE
Most active antennas are the whip type and respond mainly to the electrostatic-field portion of an electro-magnetic radio
wave. The Magnetic Loop responds primarily to the
magnetic-field
and 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 such as
TVs, florescent lamps, power line wiring etc. By rejecting the electric-field there is a reduction in local interference compared to
other types of active and passive antennas. Interference reduction is further enhanced by the deep nulls of the antenna’s
'Figure-Eight' directivity pattern (see Figure 1) that can be used to null out or reduce interference coming from a specific
localized direction.
INTERMODULATION
Some active antennas generate intermodulation products which can appear as spurious signals interfering with reception. This
interference or second and third order intermodulation is caused by non linearity in the amplifier producing signals which are
usually the sum and difference of strong AM or FM Broadcast stations and their harmonics. The
RF PRO-1B Loop
has been
specifically designed to reduce intermodulation products to a minimum. The third order intercept point is typically
+48 dBm
(OIP3) and the second order intercept point is greater than
+100 dBm
(OIP2 typically 110 dBm). The 1 dB compression point of
this amplifier is + 27 dBm making the levels of the intermodulation products generally far below the atmospheric and man-
made noise.
ANTENNA DESIGN
The
RF PRO-1B Loop Antenna
consists of a rigid light-weight ¾” diameter anodized aluminum 38 inch diameter loop and a
balanced broadband amplifier that is housed in a separate enclosure that can be mounted close to the antenna on its mast or
to any nearby flat surface. This configuration permits the insertion of an optional AM broadcast band elimination high pass filter
in the amplifier that can be remotely controlled on or bypassed. This is not normally required for good performance, but is
available to provide the ultimate performance in extremely high RF signal environments. A 20 volt DC regulated power supply
and power inserter unit are provided. The antenna and amplifier have been designed to permit the use of low-cost 75 ohm
cable (RG-6 quad-shield recommended). The maximum length is 1000 feet, but the frequency response will be a function of the
cable loss vs. length specifications. For best results the antenna should be positioned approximately 15 feet away from any
buildings or other sources of interference.
TECHNICAL INFORMATION
Frequency response:
50 kHz – 30 MHz (Nominal Gain: 27 dB ±3 dB)
DC power: 20 volts at 240 mA
OIP3: typ48 dBm
OIP2: > 100 dBm ( typically 110 dBm)
1dB compression point: +27 dBm
NF: typically 2 dB (at 10 MHz)
Antenna Diameter: 38 inches
Antenna Weight: 3 lbs
Available RG-6 Quad-Shield Lead-In Cable
with attached waterproof connectors:
www. PixelSatRadio.com
Phone: (303) 526 – 1965
Golden, Colorado
Supplied Components
QTY
Description
1
Loop antenna
1
27 dB preamplifier
1
L-bracket
2
Saddle clamps
2
U-bolts
1 lot
Mounting Screws and washers
1
CoAx Seal package
1
24 VAC wall mount transformer
1
3 ft F-male to F-male jumper cable
1
1 ft F-male to F-male water-proof jumper cable
1
PL-259 Adapter
1
20 VDC power inserter
1
Twin lead to F-female adapter
1
RCA- plug to RCA- plug cable
1
Grounding Lug
2
Nylon shoulder washers (.375 inch)
2
Nylon washers (.25 inch)
1
RCA Y adapter
Part #
Length
Price
C-50
50 feet
$ 19.99
C-100
100 feet
$ 39.99
C-150
150 feet
$ 54.99
C-200
200 feet
$ 74.99
To Order: Call (303) 526- 1965 or e-mail:
Also available on-line at
www.HighGainStore.com
Remote Controlled AM Broadcast Band High Pass Preamp Filter:
Model RF-30 FLT (
High pass 7
th
order Butterworth
)
$99.99
Page 21
www.PixelSatRadio.com
303-526-1965
ANTENNA DESIGN
The RF PRO-1B Loop Antenna consists of a rigid light-weight ¾” diameter anodized aluminum 38 inch diameter loop and
a balanced broadband amplifier that is housed in a separate enclosure that can be mounted close to the antenna on its
mast or to any nearby flat surface. A 20 volt DC regulated power supply and power inserter unit are provided. The antenna
and amplifier have been designed to permit the use of low-cost 75 ohm cable (RG-6 quad-shield recommended, and
available separately). For best results the antenna should be positioned approximately 15 feet away from any buildings or
other sources of interference.
TECHNICAL INFORMATION
Frequency response: 50 kHz –30 MHz (Nominal Gain: 27 dB ±3 dB)
DC power: 20 volts at 240 mA
OIP3: typ48 dBm
OIP2: > 100 dBm (typically 110 dBm)
1dB compression point: +27 dBm
NF: typically 2 dB (at 10 MHz)
Antenna Diameter: 38 inches
Antenna Weight: 3 lbs
SUPPLIED COMPONENTS:
QTY Description
1
Loop antenna
1
27 dB preamplifier
1
L-bracket
2
Saddle clamps
2
U-bolts
1 lot
Mounting Screws and washers
1
CoaxSeal package
1
24 VAC wall mount transformer
1
3 ft F-male to F-male jumper cable
1
1ft F-male to F-male water-proof jumper cable
1
PL-259 Adapter120 VDC power inserter
1
Twin lead to F-female adapter
1
RCA-plug to RCA-plug cable
1
Grounding Lug
2
Nylon shoulder washers (.375 inch)
2
Nylon washers (.25 inch)
1
RCA Y adapter
1
Instruction Manual
Содержание RF PRO-1B
Страница 12: ...12 Figure 10 Antenna Rotor Pole Mounting Details side view...
Страница 19: ...19 Figure 16 Supplied Accessories...
