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OVERVIEW
The LF-2040 is a 1-kW automatic HF line flattener for the frequency
range of 1.6 to 30 MHz. It is capable of matching a load VSWR of up to 3:1
to the 50-ohm impedance of an associated power amplifier.
DESCRIPTION
The line flattener is a tuned impedance matching network used in both
the transmitting and the receiving paths of an associated HF radio. It provides
maximum power transfer from solid state power amplifiers to coax fed antennas
with 3:1 SWR or less. The impedance match also improves the sensitivity of
an associated receiving system that is operating on the same frequency. Optionally
receive signals can be bypassed around the tuned network for operations where
transmit and receive frequencies are widely separated. The line flattener is entirely digital. The load impedance is analyzed
by a controlling microprocessor. Then netowrk tuning elements are switched
into the proper configuration. This tuning method permits rapid and accurate
matching of the feed line, typically completing the operation within 1 second. The LF-2040 is a member of the URG-III product line of HF communications
equipment, designed for use with either the PA-2204 or PA-2220A. It is normally
mounted near the associated power amplifier. The LF-2040 prime power and
control signals are supplied from the associated power amplifier equipment.
KEY FEATURES/USER BENEFITS
Matches antenna feed-line impedance with up to 3:1 VSWR to
1.3:1 or better (50-ohm systems) Maximum RF input of 1000-W continuous, pep or average Tunes on less than 75 watts Automatically tunes over the 1.6 to 30 MHz frequency range
- typically within 1 second Stores previously-tuned frequencies as presets; pre-set tuning
within 115-milliseconds, typically Preset tuning increases efficiency of ALE operations Digital tuning with latching relays minimizes power consumption Built-In Test (BIT) routines quickly isolate any faults Mounts in a standard EIA 19-inch rack or cabinet Controlled and monitored via standard EIA data bus from the
RT-2200 receiver-exciter Low loss tuning network permits operation at ambient temperatures
up to 50 degrees C without forced air cooling
SPECIFICATIONS
| Parameter | Specifications | Frequency
Range | 1.6 - 30
MHz | RF Input Power | 1,000
Watts, maximum | Duty Cycle | Continuous | Load Impedance VSWR - Maximum | 3:1, 50-ohm system | Tuned Input
VSWR - Maximum | 1.3:1,
50-ohm system | Tune time | 2-second
max. (1-sec typical) | Tune time
to learned preset | (115
milliseconds, typical) | Number of learned presets | 2,000 max | Prime Power | 115/230 VAC,
47/63 Hz, single-phase (supplied by associated power amplifier) | Ambient Operating Temperature | 0 to +50-deg. C. | Size | 5.25 in H, 19
in W, 23 in D (133 mm H, 483 mm W, 584 mm D) | Weight | 25.5
lbs (11.6 kg) |
SELECTION GUIDE
| Description | Part
Number | LF-2040 Line Flattener | 822-0715-002 | SK-2000
Slide Kit for EIA cabinet mounting | 751-7613-002 |
SUPPORT OFFERINGS
Product Information Material is normally available at no charge and
can be obtained by contacting GS Customer Relations: Phone: 800-321-2223 or 319-295-5100 Fax: 319-295-4777
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