Ramsey Electronics Wireless Rf Link Receiver Decoder Rxd433 Users Manual Rxd 433

RXD433 to the manual 81539672-ad5e-4e36-8a2c-e72c04cea198

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RXD-433 • 1

Ramsey Electronics Model No. RXD433

Need a data transmitter or receiver for your remote wireless

application? These compact units are perfect for any project;

car alarms, door openers, home security, you name it!

•SAW Resonators for high stability – no drift!

•Compact size with low current demand.

•433 MHz license free band.

•Sensitive superhet receiver with RF LNA.

•Automatic tuning – no manual adjustments.

•Operates on 5 volts DC.

WIRELESS RF LINK

RECEIVER/DECODER

MODULE

RXD-433 • 2

RAMSEY WIRELESS RF LINKS

• TXE433 or 916 Transmitter & Encoder Module

• RXD916 Data Receiver& Decoder

• RX433 or 916 Data Receiver

• TX433 or 916 Data Transmitter

RAMSEY TRANSMITTER KITS

• FM10A, 25B FM Stereo Transmitters

• TV6 Television Transmitter

• “Cube” TV Transmitters

RAMSEY RECEIVER KITS

• FR1 FM Broadcast Receiver

• AR1 Aircraft Band Receiver

• SR2 Short-wave Receiver

• AA7 Active Antenna

• SC1 Short-wave Converter

• LC1 Capacitance/ Inductance Meter

RAMSEY AMATEUR RADIO KITS

• CPO3 Code Practice Oscillator

• DDF1 Doppler Direction Finder

• HR Series HF All Mode Receivers

• QRP Series HF CW Transmitters

• CW700 Micro Memory CW Keyer

• QRP Power Amplifiers

RAMSEY MINI-KITS

Many other kits are available for hobby, school, Scouts and just plain FUN. New

kits are always under development. Write or call for our free Ramsey catalog.

RXD433 WIRELESS RECEIVER/DECODER INSTRUCTION MANUAL

Ramsey Electronics publication No. MRXD433 Revision 1.1

First printing: July 1999

COPYRIGHT 1996 by Ramsey Electronics, Inc. 590 Fishers Station Drive, Victor, New York

14564. All rights reserved. No portion of this publication may be copied or duplicated without the

written permission of Ramsey Electronics, Inc. Printed in the United States of America.

RXD-433 • 3

THE RXD433

This wireless RF receiver/decoder has a 4 bit data output that will match the

data sent by the encoder, TXE433. The output is CMOS compatible when

the unit is run on +5 volts.

The demod bandwidth is selectable by the placement of jumpers on the

circuit board. The table on the schematic shows jumper positions for

different bandwidths. Narrower bandwidths will give slightly better range at

the expense of more limited constraints on battery voltage tolerance over

time and more limited operating temperature range. For most applications,

the 4800 Hz setting will be best.

The “decoder address select” allows you to use one transmitter to control

different receivers by giving each receiver a unique address. The decoder

chip has internal pull-up resistors making it a simple matter of grounding the

address select pins to match the grounded pins on the transmitter/encoder.

These outputs are also CMOS compatible when run on +5 volts.

The receiver/decoder unit additionally has a “data valid” output. This output

goes high when the “decoder address select” matches the encoder’s

address select. This is convenient place to connect a “data valid” LED

indicator to show at a glance when the receiver is decoding. The schematic

below shows how such an LED can be connected.

ANTENNA CONSIDERATIONS:

The simplest antenna consists of a piece of wire approximately 6 to 7 inches

long. If you desire more range you can try a ground plane antenna or a

Yagi such as the Ramsey 4004 model. The antenna should be tuned for the

433 MHz band for best operation.

RXD-433 • 4

RXD-433 • 5

A0 through A7: These are the address lines. Individual address lines should

be tied to ground to match the TXE-433 transmitter address lines. Lines not

tied to ground can be left open.

A through D: These are the data output lines. The output from these lines will

match the input to the TXE-433 transmitter data lines.

DV: Data Valid. Output goes high when the “decoder address select” matches

the encoder’s address select. See text on page 3.

Address lines: Ground individual

lines to match transmitter address

lines.

Data lines: Access your data here.

Data output will match data input to

transmitter.

DV: Data Valid line. Attach your op-

tional LED circuit or other data valid indi-

Antenna: Attach your

antenna here.

Demod bandwidth select: Jumper as

shown in chart on schematic to change

bandwidth

GND: Attach

your power

supply

ground

here.

V+: Attach

your +5 volt

source here.

RXD-433 • 6

RXD-433 • 7

The Ramsey Kit Warranty

Please read carefully BEFORE calling or writing in about your kit. Most problems can be

solved without contacting the factory.

Notice that this is not a "fine print" warranty. We want you to understand your rights and ours too!

All Ramsey kits will work if assembled properly. The very fact that your kit includes this new man-

ual is your assurance that a team of knowledgeable people have field-tested several "copies" of

this kit straight from the Ramsey Inventory. If you need help, please read through your manual

carefully. All information required to properly build and test your kit is contained within the pages!

1. DEFECTIVE PARTS: It's always easy to blame a part for a problem in your kit, Before you con-

clude that a part may be bad, thoroughly check your work. Today's semiconductors and passive

components have reached incredibly high reliability levels, and it’s sad to say that our human con-

struction skills have not! But on rare occasions a sour component can slip through. All our kit parts

carry the Ramsey Electronics Warranty that they are free from defects for a full ninety (90) days

from the date of purchase. Defective parts will be replaced promptly at our expense. If you sus-

pect any part to be defective, please mail it to our factory for testing and replacement. Please

send only the defective part(s), not the entire kit. The part(s) MUST be returned to us in suitable

condition for testing. Please be aware that testing can usually determine if the part was truly de-

fective or damaged by assembly or usage. Don't be afraid of telling us that you 'blew-it', we're all

human and in most cases, replacement parts are very reasonably priced.

2. MISSING PARTS: Before assuming a part value is incorrect, check the parts listing carefully to

see if it is a critical value such as a specific coil or IC, or whether a RANGE of values is suitable

(such as "100 to 500 uF"). Often times, common sense will solve a mysterious missing part prob-

lem. If you're missing five 10K ohm resistors and received five extra 1K resistors, you can pretty

much be assured that the '1K ohm' resistors are actually the 'missing' 10 K parts ("Hum-m-m, I

guess the 'red' band really does look orange!") Ramsey Electronics project kits are packed with

pride in the USA. If you believe we packed an incorrect part or omitted a part clearly indicated in

your assembly manual as supplied with the basic kit by Ramsey, please write or call us with infor-

mation on the part you need and proof of kit purchase.

3. FACTORY REPAIR OF ASSEMBLED KITS:

To qualify for Ramsey Electronics factory repair, kits MUST:

1. NOT be assembled with acid core solder or flux.

2. NOT be modified in any manner.

3. BE returned in fully-assembled form, not partially assembled.

4. BE accompanied by the proper repair fee. No repair will be undertaken until we have received

the MINIMUM repair fee (1/2 hour labor) of $25.00, or authorization to charge it to your

credit card account.

5. INCLUDE a description of the problem and legible return address. DO NOT send a separate

letter; include all correspondence with the unit. Please do not include your own hardware

such as non-Ramsey cabinets, knobs, cables, external battery packs and the like. Ram-

sey Electronics, Inc., reserves the right to refuse repair on ANY item in which we find ex-

cessive problems or damage due to construction methods. To assist customers in such

situations, Ramsey Electronics, Inc., reserves the right to solve their needs on a case-by-

case basis.

The repair is $50.00 per hour, regardless of the cost of the kit. Please understand that our techni-

cians are not volunteers and that set-up, testing, diagnosis, repair and repacking and paperwork

can take nearly an hour of paid employee time on even a simple kit. Of course, if we find that a

part was defective in manufacture, there will be no charge to repair your kit (But please realize

that our technicians know the difference between a defective part and parts burned out or dam-

aged through improper use or assembly).

4. REFUNDS: You are given ten (10) days to examine our products. If you are not satisfied, you

may return your unassembled kit with all the parts and instructions and proof of purchase to the

factory for a full refund. The return package should be packed securely. Insurance is recom-

mended. Please do not cause needless delays, read all information carefully.

RXD-433 • 8

Price: $5.00

Ramsey Publication No. MRXD433

Assembly and Instruction manual for:

RAMSEY MODEL NO. RXD433

RAMSEY ELECTRONICS, INC.

590 Fishers Station Drive

Victor, New York 14564

Phone (585) 924-4560

Fax (585) 924-4555

www.ramseykits.com