One of our most popular products, receiving preamplifiers
are used for achieving top signal band performance in competition operating,
low noise longwave reception, repeater applications into the UHF region,
or lab use. Achieve deep weak signal recovery, single band preselection,
overload rejection in noisy urban environments and improved receiver sensitivity
- all in one convenient, inexpensive package.
Models for 1998 include receive and transceiver versions
(note as of OCT 2003 all Transceiver BX models have been
discontinued), the latter
with auto fail-safe switching during transmit up to 200 watts with variable
changeover time delay. All Units feature RE input current limiter, voltage
regulator, polarity over voltage/lightning protection.
Each preamp uses a single bipolar stage offering 18-20dB gain with only
a tiny 1.4 dB noise figure. Built-in front panel switch allows preamp
to be inserted or removed from receiving system anytime, and, there's
even a control on the chassis which may be set to vary preamp gain.
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
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.
Separators / Combiners
A modified version of a product that we have previously designed and built
for the Marine Radio Services, Model 119 is a passive frequency band separator
that may be used to divide and filter a single antenna input into two or
three different band outputs. May also be employed for combining two or
three different signal line sources into a common output. All units 50 ohms
standard, receive-only or signal line levels, power handling capacity 50
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.
One of our best selling products and popular worldwide Model 180 Series
are broadband impedance matching units intended for use with HF lowband,
low-noise receiving antennas. Ideal for long and medium wave listening applications
in ground-based services or at sea when connected to terminated or unterminated
beverages, long or random wires, broadband loops, EWEs, etc.
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.
Antenna Selector (Discontinued)
Want to have a wide selection of receiving antennas for your transceiver?
Here's a trick unit that allows separate receive and transmit antenna control
automatically without the requirement of transceiver modification. Up to
six selections of receiving antennas can be made when the unit is turned
on - automatic switching back to transmit feedline when transmit mode is
enabled. Excellent for use with beverage antennas, receiving loops, or low
noise random wires. Each input receiving antenna is DC-blocked for lightning
protection, chassis case is used for grounding.
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,
Discontinued Oct 2003 - Sorry
Connect multiple receivers to a single antenna or signal source with little
or no reception loss caused by receiver multicoupling with Models 111 -
118 receive signal splitters. Units are impedance matched, balanced-feed
between sections and use broadband ferrite balun-type cores.
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.
|HF, 1.8-30MHz, 2 outputs
|HF, 1.8-30 MHz, 4 outputs
|V/U, 30-500 MHz, 2 outputs
|V/U, 30-500 MHz, 4 outputs
|CATV, 54-500MHz, 2 outputs
|CATV, 54-500MHz, 4 outputs
RF Limiter / receiver protector
Here is a trick unit that is ideal for serious listeners on HF, VHF, and
UHF. Receiver protector limits input RF signal threshold at any frequency
at 0.3VRMS to protect receiver front end from
damage due to nearby transmitted fields. Receiver still acts normally and
measured signal strength is not affected.
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
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.