DS307-7 Oct 05

©2004 REG No 277 4001, England.

Page 7

FM 433MHz Narrow Band

T7 / R7

T7G / R7G

CE

31.5 mm

10.5 mm

3.0 mm

20.32 mm

12

34

5

Pin spacings 2.54 mm

Pin Dia 0.5mm

All dimensions +/- 0.5mm

1.5mm

3.5mm

T7 / T7G

R7 / R7G

12

3 4 5 6 7

30.48mm

pin spacing 2.54mm

17mm

48mm

4.65mm

Pin spacings 2.54 mm

Pin Dia 0.5mm

pin 1 is 2.33mm f rom edge of module

All dimensions +/- 0.5mm

8.30mm

Reducing Power to 10mW

If the T7G transmitter will be used with an efficient

antenna in countries where only 10mW radiated

power is allowed, then a simple resistive network

on the output of the module will attenuate the

power down to this level.

When laying out this network, keep all tracks as

short as possible, especially ground paths and

use 50 ohm track impedances when connecting to

and from this network. This impedance can be

realised on 1.6mm FR4 pcb by using a track width

of 2.5mm.

RSSI Values

The R7 / R7G receiver RSSI outputs provide a DC

output proportional to the RF signal. The table

below shows the typical RSSI value depending on

the Signal strength.

RF Signal

Strength/dBm

R7 (V)

GR7 (V)

-130

1.03

1.25

-120

1.06

1.32

-110

1.16

1.46

-100

1.34

1.69

-90

1.59

1.96

-80

1.78

2.2

-70

1.81

2.47

-60

1.81

2.5

-50

2.17

2.5

-40

2.45

-

-30

2.52

-

-20

2.52

-

Notice that the region between –80 to –60 is with

the receiver agc operating. If required, a receiver

version with agc disabled can be provided as a

factory Pre-set option. This would linear-rise the

RSSI curve.

Mechanical Dimensions

R F Solutions Ltd.,

Unit 21, Cliffe Industrial Estate,

South Street, Lewes,

E. Sussex. BN8 6JL, England

Tel: +44 (0)1273 898 000

Fax: +44 (0)1273 480 661

Email : sales@rfsolutions.co.uk

http://www.rfsolutions.co.uk

Information contained in this document is believed to be accurate , however no representation or warranty is given and no liability is assumed by R.F. Solutions Ltd. With

respect to the accuracy of such information. Use of R.F.Solutions as critical components in life support systems is not authorised except with express written approval from R.F.Solutions Ltd.

T7B

TO

ANTENNA

12

34

5

Circuit Diagram

22ohm

220 ohm

220 ohm