LF Engineering H-900 LF-MF-HF Active Gain Antenna Instruction Manual
- June 9, 2024
- LF Engineering
Table of Contents
H-900 LF/MF/HF Active Gain Antenna
Instruction Manual
H-900 LF-MF-HF Active Gain Antenna
The H-900 is a broad band active antenna and signal amplifier combination that
effectively covers the longwave through HF shortwave bands (10 kHz through 60
MHz).
The active E-probe antenna consists of impedance 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 is compact, totally sealed and ESD
suppression treated.
The antenna is omni directional allowing for various installation configurations and for use as a portable antenna. The probe is waterproof and UV resistant.
Features
- 10 kHz to 60 MHz broad band coverage.
- High desense immunity from signal overload.
- Fully sealed weatherproofed construction.
- Extended ESD and RF protection.
- Mounting clamp included.
- Power requirements: 12 VDC, 70 ma. External 120 vac adapter supplied.
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″H |
| Operating 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 typical |
| Input/Output Jacks | Phono |
| Output Impedance | 50 – 75 ohms |
| Operating Temperature | -25ºF to +120ºF |
| 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:
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 broad band signal amplifier within the
coupler provides ample gain throughout the operating spectrum. The output
impedance of the antenna is 50 to 75 ohms, and is designed to match most
receivers in use today.
The Receiver Coupler/Amplifier requires an external 120 VAC / 12 VDC power
supply, but may be operated with any regulated 12 VDC source.
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 in place of the
AC supply for portable operation.
Note: Insert the 2.5 mm power plug into the coupler/amplifier before
applying power.
If supplied with flying DC power leads be sure to connect the correct leads to
positive and negitave. Diode protection is built in for safety. Max 15 VDC.
Antenna Installation:
-
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 the neoprene grip as shown in the illustration. -
Connect the coupler/signal amplifier output (RCVR) to the antenna input of your short-wave receiver with input impedance between 50 and 75 ohms.
Caution: Do not apply RF or direct voltage to the antenna probe. Use only the proper antenna coupler. -
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 the unit is pluged in.
Signal Amplifier Operation:
- The 10 dB signal amplifier in the coupler can be switched in or out of circuit as needed. The output level is fixed and not adjustable. If necessary, attenuators may be used to control the signal level.
- 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 very strong
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:
- Keep your antenna in the clear and above metal objects. Use a good ground on your receiver.
- When mounting onto a metal pole, the mounting area should not exceed the neoprene grip.
- Use a cable strain relief (clamp, strap, tape) around the mounting pipe and cable to reduce cable fatigue at the antenna.
- Mount your antenna away from man made EMI such as florescent lighting, TV sets, light dimmers and other noise generators.
- Experiment with antenna placement to achieve the highest signal to lowest noise performance across the operating band.
Product Warranty
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 is limited to
replacement or repair of such products within 1 year from the date of
shipment.
For sales or return authorization, contact LF Engineering Co. at
860-526-4759.
LF Engineering E-mail address:
[email protected]
Copyright LF Engineering Co., Inc.
All rights reserved.
Printed in U.S.A.
LF Engineering Co.
17 Jeffery Road
East Haven, CT 06513
Documents / Resources
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Engineering H-900 LF-MF-HF Active Gain
Antenna
[pdf] Instruction Manual
H-900 LF-MF-HF Active Gain Antenna, H-900, LF-MF-HF Active Gain Antenna,
Active Gain Antenna, Gain Antenna, Antenna
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