LF Engineering LOGOH-900 LF/MF/HF Active Gain Antenna
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هوائي اكتساب نشط H-900 LF-MF-HF

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.

LF Engineering H 900 LF MF HF Active Gain Antenna

The antenna is omni directional allowing for various installation configurations and for use as a portable antenna. The probe is waterproof and UV resistant.

LF Engineering H 900 LF MF HF Active Gain Antenna - UV resistant


  • 10 kHz to 60 MHz broad band coverage.
  • High desense immunity from signal overload.
  • Fully sealed weatherproofed construction.
  • Extended ESD and RF protection.
  • تصاعد clamp وشملت.
  • 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. بحجم 4.19 ″ طول × 2.74 عرض × 1.57 ارتفاع
تردد التشغيل 10 kHz  to 60 MHz – 3 dB points
E Field Sensitivity -21 ديسيبل
إشارة Amplifier كسب 10 ديسيبل
Max. Linear Power Output 16 dBm (E-probe)
IP3 ، IP2 >35 dBm, >55 dBm typical
مقابس الإدخال / الإخراج فونو
معاوقة الخرج 50 - 75 أوم
درجة حرارة التشغيل -25 درجة فهرنهايت إلى + 120 درجة فهرنهايت
كتامة Antenna probe tested to 2 atmospheres  (-66 ft)
طاقة التيار المستمر: 12 Volts, 70 ma
AC Power: (included) 120 VAC / 12 VDC power pack with 2.5 mm plug


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.

LF Engineering H 900 LF MF HF Active Gain Antenna - VDC source

أس امدادات الطاقة:
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.

LF Engineering H 900 LF MF HF Active Gain Antenna - AC Power Supply

ملاحظة: 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.

تركيب الهوائي:

  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 the neoprene 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.
    تنبيه: Do not apply RF or direct voltage to the antenna probe. Use only the proper antenna coupler.
  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.
    ملاحظة: Power is always on when the unit is pluged in.

إشارة Amplifier Operation:

  1. 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.
  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.

ملاحظة: 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:

LF Engineering H 900 LF MF HF Active Gain Antenna - Gain Antenna

  1. Keep your antenna in the clear and above metal objects. Use a good ground on your receiver.
  2. When mounting onto a metal pole, the mounting area should not exceed the neoprene grip.
  3. Use a cable strain relief (clamp, strap, tape) around the mounting pipe and cable to reduce cable fatigue at the antenna.
  4. Mount your antenna away from man made EMI such as florescent lighting, TV sets, light dimmers and other noise generators.
  5. Experiment with antenna placement to achieve the highest signal to lowest noise performance across the operating band.

ضمان المنتج

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: sales@lfengineering.com

Copyright LF Engineering Co., Inc.
© جميع الحقوق محفوظة.
طبع في الولايات المتحدة الأمريكية
LF Engineering Co.
17 Jeffery Road
إيست هافن ، كونيتيكت 06513

وثائق / موارد

LF Engineering H-900 LF-MF-HF Active Gain Antenna [pdf] دليل التعليمات
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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