All units are small in size, can be used indoors or outdoors, and require only about 50mA at 12VDC negative ground. Low frequency preamps (receive) are fitted with RCA "pin"connectors, higher-frequency models above 100 MHz are built with BNC connectors, but SO-239s or N connectors are available for all units if requested. Transceiver models all use SO-239s or BNC.

Housings are I.C.E. heavy wall 1/8" shielded chassis measuring 4" square by 1" height for receive-only models, 11/2" taIl for transceiver types, weight 1 pound each. Preamps are packed with 4 page owner's manual.

Wideband preamps cover a large spectrum segment for receiver or transceiver use with no tuning requirements. Ideal for general coverage use in HF, VHF, UHF or CATV applications, these lightweight, portable preamps offer high gain with very high stability. Each uses a low gain transistor preamp with low noise characteristics similar features to the single band preamps, such as input current limiting circuitry (to protect amplifier devices from damage when large input signals are presented), voltage regulator, polarity protection, overvoltage control, lightning protection, and highpass filtering.

Model 135B is a single stage high gain preamp developed specially for the lowband enthusiast. It offers 20dB of weak signal improvement but only in the frequency range 1.8-4.0 MHz. Circuit employs cutoff filtering both below 1.8 MHz and then above 4.0 MHz, creating a 2.2 MHz bandpass region. Ideal for 160 and 80/75 Meter operators wishing to employ a single preamp for both bands together when used with Beverage, EWE, etc. Same chassis size of the other units, 50 ohms, 12VDC @ 50mA, RCA pin connectors standard.

Chassis controls include in/out switch, preamp gain, voltage indicator LED, and 2.5mm DC input connector for 12VDC negative ground at 100mA. Low frequency model 130B uses RCA pin connectors, 130BX is outfitted with SO-239s while VHF/UHF model 133B and 133BX are BNC standard and 170B connects with CATV standard "F" Connectors. N-type connectors are also available per request. Preamp gains are 16-18dB, chassis measures 4 inches square by 1" tall for receive-only models, 11/2" for transceiver types, weight 1 pound each. Each is packed with 4-page owner's manual and DC connector.

Suggested uses include low band Amateur, MARS or industrial communications being received on a single antenna (such as a terminated or unterminated beverage, broadband loop, active antenna, EWE, etc.) and fed to two or three different receivers, each receiving on a different frequency band. Isolation between ports on models shown below typically about 40dB.

Circuit consists of both series and parallel tuned circuits in a divider configuration using torroidal inductors in lower frequency units and air wound coils in higher frequency models, silver mica capacitors used throughout. Units are tuned for 50 ohm low SWR match to provide passage of entire frequency band, high rejection balance of spectrum. Layout is compatible when used with receive splitters, preamplifiers, other filter devices, etc.

Two band units constructed in a 3" square X 11/2" high standard I.C.E. heavy chassis, 1/8" thick aluminum. Three band units slightly larger at 4" square, same height and construction.

Standard connectors for this product are RCA 'pin' coaxial, but units are available with SO-239, BNC, N or F connectors at no additional charge. Best bet - state which connectors best suit your existing cable setup and we'll accommodate. Input connector is mounted on one side of chassis, all outputs on the opposite side, top labeling. Units packed with owner's manual/tips, weight 1 pound each.

Coaxial cable attaches to input SO-239 connector (standard for this product), output impedance taps available for 300, 450, 600 and 800 ohms on side terminals. Case of unit works at ground potential.

Units are offered in two frequency ranges and in both high isolation (no DC continuity between input and outputs) or DC passive (DC continuity between SO-239 center pin and all outputs for directional switching operations). DC passive units usable with voltage duplexing through coaxial line up to 50VAC/DC. RF power rating about 25W-all models.

Isolation units are Models 180A (1.5 - 30MHz) and 182A (extended frequency coverage 100kHz - 30MHz). DC passive selections are Models 181A (1.5 - 30MHz) and Model 183A (extended frequency coverage 100kHz - 30 MHz). Isolation units are capacitor blocked at 2KV for lightning protection with on-board backup gas breakdown tube. DC passive units employ MOV dual-polarity overvoltage protection.

185A is a non-inductive resistive load for beverage terminations, taps of 300, 450, 600 and 800 ohms. Power handling capacity low continuous, 100W peak. Includes gas protective tube for lightning protection - works well in high-intensity RF fields.
All units built in I.C.E. standard heavy chassis measuring (HWD) 11/2" X 2" X 3", indoor/outdoor use, stainless steel hardware, flat surface mounting or use with bolt-on mounting frames featured on page 18. Each unit packed with 4-page owner's manual.

Special switch on rear panel allows for auxiliary output of selected receive antenna to allow external use of receive filtering, preamplification, etc. Simple cabling from output connector through external device and back into the unit completes the circuit. Or place switch in "join" position for normal operation.

Add a bandpass filter unit between the transceiver's output connector and the input connection to the 186 and enjoy single band filtration control on both transmit and receive modes automatically. Works equally well with single band filter or multiband switched filter. This unit is so adaptable that it can be used to control, switch, process and deliver a wide variety of useful transceiver services externally without internal modification of the radio.

186A requires 12VDC at about 50mA to achieve switching with built-in relay. Automatic timing for SSB/CW built in and variable with front panel control. Works with any radio with 1/2 Watt output up to 200 Watts. Frequency range 0.5-30 MHz, 50 or 75 ohms.

Transceiver connections are SO-239 input and output. Receive antenna and auxiliary connectors are RCA pin type. Chassis measures (HWD) 3" X 6" X 6", weight 4 pounds. Packed with 4-page owner's manual, DC connector.

Discontinued Oct  2003 - Sorry

Active units Models 112 (HF), 115 (VHF/ UHF), and 118 (CATV) employ single transistor technology and feature low gain with high port-to-port isolation, 20dB typical. All units operate on 12VDC 50-150 mA, negative ground and may be operated with simple non-regulated power supply. On-board regulator provides near battery-like voltage purity to amplifier sections. Other built-in features include input overload / voltage isolation protection, non-abusive polarity protection (no damage to unit or power supply if improper polarity is presented), non-DC passive outputs. Two output splitters provide 2 to 4 dB gain, four output units 1 to 2 dB gain average.

Passive Models 111 (HF), 114 (HF/ UHF), and 117 (CATV) use a similar ferrite signal division and port to port isolation of approximately 20dB. Two output units lose 3-4db, four output units 6-7db.

The 112-2A and 112-4A have a high pass filter set at 1.5 Mhz to reject BCB intermod when used in the Amateur bands. We do not recommend bypassing this filter due to overload, and IMD products that will occur.

All HF models (111, 112) employ RCA "pin" connectors. VHF / UHF models (114, 115) feature BNC connectors standard (N also available). CATV units (117, 118) are built with industry standard "F" connectors.

Active units all measure 4" square, 1" tall, 1/8" thick aluminum chassis. Passive units measure 2" X 3" (2 outputs) or 2" X 4" (4 outputs), all 1" tall. Any unit with SO-239 or N connectors 11/2" tall. Weight 1 pound.

Circuit uses a multi-stage design of transformer saturation coupling and current limiters. Models 196 and 198 are receive RF limiting only, while models 197 and 199 offer the same but with our constant-drain, capacitor-blocked lightning arrestor technology built in to the same unit.

For all receivers, especially the new broadband super-sensitive solid state units. Low frequency models are fitted with RCA pin connectors while high frequency units are BNC. N connectors available on request. Chassis measure (HWD) 1" x 2" x 3", weight one pound, packed with 4 page owner's manual / data sheet.