LF Engineering Communication Products

- LF Engineering Products -

H-800 SkyMatch
LF/MF/HF Active Antenna

$149.00

Monitoring Times Review (260k pdf)

The H-800 SkyMatch is a compact broadband active antenna that effectively covers the longwave, mediumwave and shortwave bands (10 kHz through 50 MHz. The antenna's active components are housed in a 26 inch fully sealed probe and powered through a coaxial feed from the remote coupler interface at the receiver end.The H-800 is an alternative antenna to a long wire system where space is limited. Great for portable operation using internal batteries. Supplied with fifty feet of RG-174/U cable. AC supply included for fixed operation.

- Specifications -

Antenna Probe

E probe Construction

Coupler Size

Operating Frequency

E Field Sensitivity
IP3

Input/Output Jacks

Output Impedance

Operating Temperature

Weatherproofing

DC Power:

AC Power: (included)

26 inches long, 1 inch dia.

PVC, Neoprene

4.19"L x 2.74"W x 1.57"H

10 kHz to 50 MHz

-24 dB
23 dBm

RCA Phono Type (BNC optional)

50 - 100 ohms

-25F to +120F

Probe tested to 2 atmospheres (-66 ft)

12 - 18 volts, 10 ma, (2) 9 volt batteries

120 VAC / 12 VDC power pack

MH-920
LF/MF/HF Marine Active Antenna

$299.00

The MH-920 is a broadband active antenna designed for a wide spectrum of ship-board marine applications including A2/A3/A4 GMDSS, NAVTEX, DGPS, LORAN, AM BC, and general shortwave listening.

The amplified antenna is designed to operate within an RF noisy environment with a high desense immunity from RF overload, including VHF/UHF and radar. Constructed with harsh marine requirements in mind, the antenna probe consists of a fully sealed PVC housing with 1"-14 threaded mounting base with shielded BNC output. Universal mount included.

- Specifications -

Antenna Probe

E probe Construction

Coupler Size

Operating Frequency

E Field Sensitivity

Signal Amplifier Gain
Third-Order Intercept

Max. Linear Output
Output Impedance Input/Output Jacks

Operating Temperature

Weatherproofing

DC Power:

AC Power:

27 inches long, 1 inch dia.

PVC, Neoprene, 1"-14 Mounting Thread

4.19"L x 2.74"W x 1.57"H

10 kHz to 50 MHz

-21 dB

12 dB
>35 dBm

17 dBm
50 - 75 ohms
BNC

-25°F to +130°F (-30° to 50°C)

Probe tested to 2 atmospheres (-66 ft)

12 - 15 volts, 60 mA

120 VAC / 12 VDC power pack

ML-420
VLF/LF Marine Active Antenna

$299.00

The ML-420 is a compact low frequency active antenna designed to cover the longwave band of 10 kHz to 550 kHz. One antenna to cover the marine listening requirements of NAVTEX Weather Service, DGPS, NDB Navigational Aids, Time Standards, and LORAN. The ML-420 is the most sensitive longwave active antenna on the market with a proprietary high impedance low pass filtering / equalizing system, resulting in a flat LF response.

The antenna is onmi directional allowing for various installation configurations. The ML-420 has a high desense immunity from RF overload, including AM BC, VHF/UHF and radar. Constructed with harsh marine requirements in mind, the antenna probe consists of a fully sealed PVC housing with 1"-14 threaded mounting base with shielded BNC output. Universal mount included.

- Specifications -

Antenna Probe

E probe Construction

Coupler Size

Operating Frequency

E Field Sensitivity

Third-Order Intercept
Max. Linear Output
Output Impedance
Input/Output Jacks
Operating Temperature Weatherproofing

DC Power:

AC Power:

27 inches long, 1 inch dia.

PVC, Neoprene, 1"-14 Mounting Thread

4.19"L x 2.74"W x 1.57"H

10 kHz to 550 kHz

-6 dB
35 dBm

15 dBm
50 to 75 ohms

BNC

-25°F to +130°F (-30° to 50°C)

Probe tested to 2 atmospheres (-66 ft)

12 - 15 volts, 30-40 mA

120 VAC / 12 VDC power pack

M-601C
AM BC Active Antenna

$179.00

Audio Magazine Review (222k pdf)

The M-601C is commercially rugged and suitable for outdoor installations. Proven reliable, and used in installations around the world for more that ten years, the M-601 is considered a standard among professionals as an excellent source antenna for distributed communications and home entertainment systems. Operating between 530 and 1750 kHz, the high impedance E-field antenna contains a high gain signal amplifier and high pass filter for reduction of lower frequency interference caused by dimmers and power lines. The antenna is easily pipe or mast mounted. Supplied with fifty feet of RG-174/U cable. AC supply included.

Optional Inductive Coupler AC-600 provides a wireless connection between the active antenna and a portable receiver's ferrite loop stick antenna. (100 kHz - 5 MHz) AC-600, $42.00

Optional Two-Way Splitter SPL-2/75 provides two low loss impedance matched outputs for two AM BC receivers when feeding signal from one antenna, or combining two antennas for one receiver. SPL-2/75, $45.00

- Specifications -

Antenna Probe

E probe Construction

Coupler Size

Operating Frequency

E Field Sensitivity
IP3

Input/Output Jacks

Output Impedance

Operating Temperature

Weatherproofing

DC Power:

AC Power: (included)

26 inches long, 1 inch dia.

PVC, Neoprene

4.19"L x 2.74"W x 1.57"H

530 kHz to 1700 kHz

-12 dB
28 dBm

RCA Phono Type (BNC optional)

50 - 100 ohms

-25F to +120F

Probe tested to 2 atmospheres (-66 ft)

12 - 18 volts, 20 ma, (2) 9 volt batteries

120 VAC / 12 VDC power pack

L-400B
LF/VLF Active Antenna

$159.00

Monitoring Times Review (537k pdf)

The L-400B active antenna is a compact 26 inch fully sealed e-probe designed for receiving within the VLF and LF (1750 meters) spectrum. The versatile and proven reliable L-400B may be used with all 50 to 100 ohm input receivers and converters. The L-400B broadband filter design enables you to effectively receive the entire LF spectrum from less than 10 kHz through 530 kHz without the need for a tuner. The antenna has very high E-field sensitivity with the advantage of excellent BC intermodulation rejection with its sharp roll off filter. The antenna is omni-directional allowing for various installation configurations and for use as a portable antenna. Supplied with fifty feet of RG-174/U cable. AC supply included.

- Specifications -

Antenna Probe

E probe Construction

Coupler Size

Filter Rejection
Frequency Response
E Field Sensitivity
IP3
Input/Output Jacks

Output Impedance

Operating Temperature

Weatherproofing

DC Power:

AC Power: (included)

26 inches long, 1 inch dia.

PVC, Neoprene

4.19"L x 2.74"W x 1.57"H

³ 40 dB above 600 kHz
<10 kHz to 530 kHz ± 5 dB
-3 dB @ 250 kHz
24 dBm

RCA Phono Type (BNC optional)

50 - 100 ohms

-25F to +120F

Probe tested to 2 atmospheres (-66 ft)

12 - 18 volts, 20 ma, (2) 9 volt batteries

120 VAC / 12 VDC power pack

L-111
LF Converter & Active Antenna System

$220.00

The L-111 System provides full coverage of the LF spectrum from less than 10 kHz to 530 kHz. The L-111 combines the proven L-400B active antenna with a sensitive LF to HF converter. The externally mounted LF converter contains a low impedance wide dynamic range balanced mixer, with RF, IF and local oscillator filtering. The converter's high L.O. rejection greatly improves reception below 10 kHz and its sharp roll-off filter characteristics eliminate BC intermodulation. Receiver tuning is between 4.0 MHz and 4.5 MHz. Supplied with fifty feet of RG-174/U cable. AC supply included.

- Specifications -

Antenna Probe

E probe Construction

Coupler/ Converter Size

IF Output Frequency

Frequency Response

IF Rejection

E Field Sensitivity

Input/Output Jacks

Output Impedance

Operating Temperature

Weatherproofing

DC Power:

AC Power: (included)

26 inches long, 1 inch dia.

PVC, Neoprene

4.19"L x 2.74"W x 1.57"H

4 to 4.5 MHz

3 kHz to 530 kHz ± 5 dB

80 dB typical

-3dB @ 250 kHz (L-400B E-probe)

RCA Phono Type (BNC optional)

50 - 100 ohms

-25F to +120F

Probe tested to 2 atmospheres (-66 ft)

12 - 18 volts, 30 ma, (2) 9 volt batteries

120 VAC / 12 VDC power pack

Active Antenna Option with BNC

$20.00

Active Antennas and Couplers with BNC F Connectors are available as an option for Models: H-800, M-601C, L-400B and L-111. Note: With BNC Option, all coaxial cabling between the antenna and coupler is user supplied. Most any type of 50 or 75 ohm coax with BNC M connectors may be used. Antenna to coupler cable runs can be up to 200 feet using 1/4 inch cable, or 600 feet using 1/2 inch cable. Add $20.00 for active antennas with BNC option.

L-111/PCB
LF/VLF Converter Board

$98.00

L-111/PCB circuit board is from the L-111 VLF/LF converter. For use with long wire antennas or with the L-400B active antenna. Receiver tuning is between 4.0 and 4.5 MHz. Assembled and tested. This unit is ready for custom assembly into your receiver or instrument box. Instruction Sheet provided.

- Specifications -

Circuit Board Size

IF Output Frequency

Frequency Response

IF Rejection
Input/Output Jacks
Output Impedance
DC Power:
Operating Temperature

3.75"L x 2.5"W

4 to 4.5 MHz

3 kHz to 530 kHz ± 5 dB

80 dB typical

RCA Phono Type

50 - 100 ohms
12 - 18 volts, 20 ma, (2) 9 volt batteries

-25F to +120F

L-202B
LF/VLF Preamplifier

$98.00

The L-202B fixed tuned amplifier / filter / impedance matcher - designed to improve your receiver or converter's VLF and LF (1750 meters) reception. The second generation "B" version has increased dynamic range and improved linearity designed specifically for LF receivers and converters plagued with AM BC intermod and poor sensitivity. The L-202B contains a proprietary sharp roll-off filter scheme that effectively cleans up broadcast intermod and reduces noise. The low noise amplifier boosts gain throughout the entire LF spectrum and provides flat coverage between 10 kHz and 520 kHz. The L-202B is designed for use with typical 50 foot SWL wire antennas. External 12 vdc power supply included.

- Specifications -

Preamp Size

Filter Rejection:

Max. Linear Power Output
Gain:

Pass Band:

Output Impedance:

Input Impedance:

Input/Output Jacks

Operating Temperature

DC Power:

4.19"L x 2.74"W x 1.57"H

> 40 dB in AM BC passband & higher

8 dBm
28 dB (adjustable)

10 to 520 kHz ±4 dB

50 - 75 ohms

2k ohms

RCA Phono Type

-25F to +120F

120 VAC/12 VDC external power supply

L-202/PCB
LF/VLF Preamplifier Board

$80.00

L-202/PCB circuit board is completely wired and tested with the same specifications as the L-202B. The PC board is ready for custom assembly into your receiver or instrument box. Instruction Sheet provided.

- Specifications -

Circuit Board Size

Filter Rejection:

Max. Linear Power Output
Gain:

Pass Band:

Output Impedance:

Input Impedance:

Input/Output Jacks

Operating Temperature

DC Power:

3.75"L x 2.5"W

> 40 dB in AM BC passband & higher

8 dBm
28 dB (adjustable)

10 to 520 kHz ±4 dB

50 - 75 ohms

2k ohms

RCA Phono Type

-25F to +120F

12 VDC external supply

SPL-2/75 Broadcast
Two-Way Splitter

$45.00

The SPL-2/75 Broadcast Two-Way Splitter/Combiner provides an impedance matched 75 ohm coaxial connection for two receivers when feeding signal from one M-601 antenna, or when combining two antennas for one receiver or distribution amplifier. The splitter consists of a low loss torroid matching network designed to maintain a low impedance signal split with high isolation between ports.

- Specifications -

SPL-2/75 Size:

Bandwidth:

Input Impedance:
Output Impedance:

Insertion Loss:
Port Isolation:
Shorted Port Loss:
Connections:

2.87"L x 2.38"W x 1.00"H

20 kHz to 30 MHz

75 ohms

75 ohms

< 1 dB above 6 dB splitter loss
> 40 dB typical
< 1 dB

RCA Phono Type

SPL-2/50L VLF-HF
Two-Way Splitter

$45.00

The SPL-2/50L VLF-HF Two-Way Splitter/Combiner provides an impedance matched 50 ohm coaxial connection for two receivers when feeding signal from one active antenna, or when combining two different antennas (L-400B and H-800), or combining an active antenna and a wire antenna into one receiver. The splitter consists of a low loss torroid matching network designed to maintain a low impedance signal split with high isolation between ports.

- Specifications -

SPL-2/50 Size:

Bandwidth:

Input Impedance:
Output Impedance:

Insertion Loss:
Port Isolation:
Shorted Port Loss:
Connections:

2.87"L x 2.38"W x 1.00"H

< 10 kHz to 30 MHz

50 ohms

50 ohms

< 1 dB above 6 dB splitter loss
> 40 dB typical
< 1 dB

RCA Phono Type

N-300
Ground Isolator

$24.00

The N-300 Ground Isolator is designed for isolating ground loops and noise. The N-300 is used between the antenna coax line and the receiver, (not for transmitting). Band width is 10 kHz to 30 MHz. The N-300 consists of a bifilar wound torroid with a 50 ohm impedance.

- Specifications -

N-300 Size:

Bandwidth:

Input/Output Impedance :

Winding Capacitance:

Isolation Resistance:

Connections

2.87"L x 2.38"W x 1.00"H

10 kHz to 30 MHz

50 ohms

30 pf typical

>20 meg ohm

RCA Phono Type

L-600S
H-Field Loop Receiving System

Call for pricing and availability

Custom versions for Electric Utilities and Telecom for line noise tracing.

The L-600S is newly revised for 2007 with receiver and filtering enhancements. The antenna system is designed with the serious Natural Radio experimenter in mind. The L-600S is an effectiveH-Field receiving system for use in EMI noisy areas, or within E-field quiet areas. The directional loop design in combination with the receiver's sharp filtering, greatly reduces unwanted noise and hum. Frequency response is 300 Hz to 30 kHz (broadband). The 24 inch square PVC loop may be broken down into components for storage. The loop antenna and receiver may be hand held or tripod mounted. See Field Testing. Switchable high pass filter for noise reduction. Tape recorder / sound card and earphone outputs included with the ELF receiver.

- Specifications -

Receiver Size:
Antenna Loop Size:

Frequency Response:

Loop Inductance

Receiver HP Filter:

Input/Output Jacks:

DC Power:

Audio Output (300 mW)
4.19"L x 2.74"W x 1.57"H
24 inch square (1/2" PVC pipe)

300 Hz to 30 kHz broadband

25 mH

-3 dB @ 1-6 kHz, > -60 dB @ 60 Hz

3.5 mm

9 volt, 7 - 30 ma typical, (1) 9 volt battey

4-32 ohms (earphone), 10k ohms (recorder)

Interface Adapters

Adapters for input/output interface change. Adapter connections may be combined with other mating adapters. $4.95 each, plus $2.00 postage (free shipping with any antenna order).

- Adapter Accessories -

Description Part Number

RCA Male / BNC Female:
BNC Male / RCA Female:

UHF Male / BNC Female:

RCA Male / UHF Female:
ADPT-RM-BF
ADPT-BM-RF

ADPT-UM-BF

ADPT-RM-UF

3M� Scotch-Seal�

3M� Scotch-Seal� 2229 Mastic Tape, is a durable mastic tape product, designed as the best weatherproofing sealant for electrical connections, splices and feed-throughs. Easily wrapped and stretched around irregular surfaces, or molded as a plug to form a solid water-tight block. Self-healing and UV resistant with a high dielectric rating. Available in rolls of 1 inch x 10 feet, $18.00 each, or in economy lengths of 1 inch x 2 feet at $4.00 each. Add $2.00 postage per order (free shipping with any antenna order). 3M� Scotch-Seal� is a Trademark of 3M Corp. U.S.A.

- Order Information -

Standard shipping method is UPS ground with a flat rate charge of $8.00 per order, Contact LF Engineering for optional shipping arangements.

For shipment outside North America, add $35.00 for USPS Global Express.

Products are warranted for one year.

Major credit cards accepted.

Phone Order: 860-526-4759

FAX Number: 866-275-5743

E-Mail: sales@lfengineering.com

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Expedite Fee for Same Day Shipping

Our order processing time is typically 24 to 48 hours, since many of our products require a final build and test. If you require same day shipment of your product, there will be a 20 percent surcharge for this expedite service. So please, plan ahead.