Ramsey Electronics 2012 Catalog - Home

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Great Gain And
Super Selectivity!
Amateur Radio Gear 57
✔ 2 Meter Preamp with the sharpest filtering available!
✔ Can be powered up the signal coax (9 to 15 VDC)
✔ Helical filter for fantastic intermod rejection
Here’s the ideal preamp for repeaters, base stations, mobiles - anywhere a selective, low noise signal boost is needed. Unlike other preamps the PR100
features extensive RF filtering to crush intermod before it reaches your radio.
Two poles of sharp Helical filtering combined with a 3 pole L-C tank allow only signals of interest to reach your receiver. A low noise microwave bipolar transistor
provides an excellent 1 dB noise figure while remaining ruggedly insensitive to static and strong signals. Preamp is easily configured to be powered via the coax (for
mast mount applications) or powered through a separate power cable. Kit is designed to fit snugly into a 3” long piece of 1 ½” PVC pipe with end caps, making an ideal outdoor
enclosure. Runs on 9 to 15 VDC. Size: 4”W x 7/8”H x 1 3/8”D.
PR100 2 Meter Receiver Preamp Kit $24.95
Low Cost Receiver Preamps
✔ Low noise (typically < 1 to 1.5 dB)
✔ High Q tuned circuits (very narrow band) prevent
out-of-band signals from overloading front-end
✔ Available in 2 meter, 220 Mhz, 440 MHz
The Quick And Easy
Preamplifier!
KIT
KIT 2-Meter Receiver Preamplifier
Put some new “ears” on your rig with one of these hot little preamp kits. Their high gain combined with low noise will improve
most any receiver. Fully protected against overload and designed for low current and stable operation, these preamps employ high Q
tuned circuits which restrict out-of-band signals which can cause intermod blanking and overload of your radio’s front-end.
PR20
PR40
Don’t be misled by GaAs FET claims! The cheap dual-gate FETs (manufactured for TV tuner usage!) used by others just don’t come close to the performance of these
preamps designed with NEC microwave transistor devices. Gain is typically 16 to 20 dB and noise figure is 1 dB @ 2 Meters, 1.2 dB @ 220 MHz, and 1.4 dB @ 440 MHz. Compact
design for easy installation into most any rig. Operates on 12 to 15 VDC . Size: 1” x 3/8” x 1 ½”.
PR10 2 Meter Receiver Preamp Kit $9.95
PR20 220 MHz Preamp Kit $9.95
PR40 440 MHz Preamp Kit $9.95
TX Data Transmitter
RXDA
Receiver/Decoder
RX Data Receiver
RXD Receiver/Decoder TXE Transmitter/Encoder
TXEA
Transmitter/Encoder
Dimensions of each board are as follows:
RXD433A 1.28” x 1.6” TX433 .57” x .75”
TXE433A 1.28” x 1.3” RXD916 1.16” x 1.7”
RXD433 1.42” x 1.26” TXE916 .75” x 1.325”
TXE433 .75” x 1.325” RX916 1.04” x 1.15”
RX433 .85” x 1.26” TX916. 57” x .75”
Wired & Tested
Let These Modules Do All The
Work In YOUR Next Project!
RF Wireless Link Modules
✔ The EASY way to send and receive data!
✔ 433MHz and 916 MHz units available!
✔ Transmitters, receivers, encoders, decoders
✔ Factory assembled & tested SMT design
Now you can build those special remote control projects in a flash and have the ultimate in reliability... and security!
Unlike other units on the market, these units are crystal controlled for no frequency drift, yet are ultra small and very low
power. The decoder output provides +5VDC or 0 (1 or zero) switch output that is CMOS compatible. Encoder data
enable input also accepts the same standard CMOS compatible input.
To give these little boards even more versatility, they can be easily interfaced to the outside world by using other Ramsey
kits. Simple switches can be used on the inputs of the TX and TXE modules to control one (RX) or up to four output circuits
(RXD) connected to the receiver modules. The BE164 can be used with the TXE modules along with the BD416 on
the RXD modules to control any 1 of 16 output circuits. The RI1 can be added to the output of the RX, RXD, or BD416 to
provide a switch relay to control devices like house lighting, motors, or other high voltage or current devices.
These wireless RF link boards are perfect for any wireless application - sending data, car alarms, door openers, home
security, electronic monitoring... you name it! You can also monitor a test point or an alarm point on a circuit and have it
alert you remotely. The applications are endless! Thousands of these have been provided to manufacturers for their
OEM use! You may already have one of these and not know it!
The basic TX/RX models transmit one bit of unsecure information. Great for when you only need to turn one device on
or off. Easy to connect, just solder your inputs and outputs to the provided pads.
The encoder/decoder models allow you to program each unit so that they only respond to your set address code, 256
different addresses possible. These units have four separate data lines for either sending four bit data or controlling four
separate devices. No processor or computing required! The TXE/RXD use the same simple input and output solder
connections as the TX/RX units, for the addressing simply solder desired address pads to ground. The A-Series modules
include a programmable dip switch for encoder/decoder address settings and common dual row pin-outs for easy integration
into your equipment!
Two versions are available - 433 MHz and 916 MHz. 916 units can use shorter antennas (3 inches) and are better in high
RF environments while the 433 units have better range but need larger antennas (7 inches). All units will operate on 5
volts DC. Depending on model other voltages are available. Worst case 20mA operating current, stand-by current in the
low micro amps.
Because these are subminiature SMT designed circuits and boards, they are factory assembled and tested at Ramsey! Not a kit, these are immediately ready to use or integrate
with your project! (No, these do NOT send audio or video, they send data!!! There, saved you the email!)
RXD433A 433 MHz Receiver/Decoder Module w/Dip Switch $39.95
TXE433A 433 MHz Transmitter/Encoder Module w/Dip Switch $37.95
RXD433 433 MHz Receiver/Decoder Module, Assembled $34.95
TXE433 433 MHz Transmitter/Encoder Module, Assembled $32.95
RX433 433 MHz Data Receiver Module, Assembled $29.95
TX433 433 MHz Data Transmitter Module, Assembled $24.95
RXD916 916 MHz Receiver/Decoder Module, Assembled $34.95
TXE916 916 MHz Transmitter/Encoder Module, Assembled $32.95
RX916 916 MHz Data Receiver Module, Assembled $29.95
TX916 916 MHz Data Transmitter Module, Assembled $24.95
PR10
Make it easy!
Use our BE164 and
BD416 boards on
page 42 to interface
with these RF
Modules!