H-900 LF/MF/HF Active Gain Antenna

H-900 LF/MF/HF Active Gain Antenna
The H-900 is a broad band active antenna andsignal amplifier combination that effectively
covers the longwave through HF shortwave
bands (10 kHz through 60 MHz).
The active E-probe antenna consists ofimpedance matching electronics, and amplifier
with a maximum linear output of 16 dBm. The
H-900 has high E field sensitivity for its compact
size with the advantage of good BC and spurious
intermodulation rejection. The antenna iscompact, totally sealed and ESD
suppression treated.
The antenna is omni directional
allowing for various installation
configurations and for use as aportable antenna. The probe iswaterproof and UV resistant.

Features
10 kHz to 60 MHz
broad bandcoverage.
High desense
immunity fromsignal overload.
Fully sealed
weatherproofedconstruction.
Extended ESD andRF protection.
Mounting clamp
included.

Product WarrantyPowerrequirements: 12VDC, 70 ma.
External 120 vac
adapter supplied.

LF Engineering Co. warrants that, at the time of shipment the products
manufactured by LF Engineering Co. are free from defects in material
and workmanship. LF Engineering Co. obligation under this warranty islimited to replacement or repair of such products within 1 year from thedate of shipment.
For sales or return authorization,contact LF Engineering Co. at (860) 526-4759.
LF Engineering E-mail address: sales@lfengineering.com

Copyright 2005 by LF Engineering Co., Inc.
All rights reserved.
Printed in U.S.A.

LF Engineering Co.
17 Jeffery Road
East Haven, CT 06513

H-900 Specifications
Antenna Probe Size

25 inches long, 1 inch dia. PVC, color gray

Coupler/Signal Amp. Size

4.19"L x 2.74"W x 1.57"HOperating Frequency

10 kHz to 60 MHz - 3 dB points

E Field Sensitivity-21 dB

Signal Amplifier Gain

10 dB

Max. Linear Power Output

16 dBm (E-probe)

IP3, IP2>35 dBm, >55 dBm typicalInput/Output Jacks

Phono

Output Impedance

50 - 75 ohms

Operating Temperature-250F to +1200F

Weatherproofing

Antenna probe tested to 2 atmospheres (-66 ft)

DC Power:

12 Volts, 70 ma

AC Power: (included)

120 vac / 12 vdc power pack with 2.5 mm plug

Introduction:

Signal Amplifier Operation:

The H-900 Active Gain Antenna covers the full LF/HF/VHF spectrum
from 10 kHz through 60 MHz. The combination of a proprietary low
noise amplifier in the E-probe (2 wire feed), and a switchable broadband signal amplifier within the coupler provides ample gain throughout
the operating spectrum. The output impedance of the antenna is 50 to75 ohms, and is designed to match most receivers in use today.

1. The 10 dB signal amplifier in the coupler can be switched in or out ofcircuit as needed. The output level is fixed and not adjustable. Ifnecessary, attenuators may be used to control the signal level.

The Receiver Coupler/Amplifier requires
an external 120 vac / 12 vdc power
supply, but may be operated with any
regulated 12 vdc source.
EXTERNAL
POWER
PLUG

AC Power Supply:
The 120 vac / 12 vdc power supply plugs into the
2.5 mm jack located on the front panel. An
external 12 vdc battery pack may be connected inplace of the ac supply for portable operation.
Antenna Installation:
1. Mount the antenna E probe in the clear 8 ft to 20 ft high in the clear,preferably roof height. Use the stainless clamp supplied for
attachment to a vertical support pole.
a. A support pole may be any vertical structure made from wood,
metal or PVC that is between 1 and 2 inches in diameter. You may
use an external roof structure such as the top of a TV mast or roof
vent pipe. Note: The use of a vent pipe or any other large diameter
mounting surfaces may require a larger mounting clamp.
b. The support pipe should not be attached any higher than theneoprene grip as shown in the illustration.
2. Connect the coupler/signal amplifier output (RCVR) to the antenna
input of your short-wave receiver with input impedance between 50
and 75 ohms.
3. Power up the coupler/signal amplifier by connecting the power supply
to the coupler. The coupler LED will light and your system is now
ready for use. Note: Power is always on when unit is pluged in.

2. Normal position of the signal amplifier is "on" for full high sensitivity
performance. The amplifier can be switched "off" if very strong
stations are present and receiver overloading occurs.
Note: In the signal amplifier "on" mode , if oscillation occurs, be sure
to check that the output coaxial ground connection is secured.
The E-probe alone without the signal amplifier applied can handle verystrong signals without overloading, although the receiver in use may
overload and may require signal dampening with attenuators or by use of
the receiver's RF gain control.
How to Get the Most Out Of Your H-900 Active Gain Antenna:
1. Keep your antenna in the clear and above metal objects (8 ftminimum height) and use a good ground on your receiver.
2. Locate the antenna away fromtransmitting antennas to reduce
receiver interference.
3. When mounting onto a metalpole, the mounting area should
not exceed the neoprene grip.
4. Use a cable strain relief (clamp,strap, tape) around the mounting
pipe and cable to reduce cable
fatigue at the antenna.
5. Mount your antenna away fromman made EMI such as
florescent lighting, TV sets, lightdimmers and other noise
generators.
6. Experiment with antenna
placement to achieve the highest
signal to lowest noise
performance across theoperating band.