DS306-3

May 03

2003 REG No 277 4001, England.

Page 7

Radio Transmitter & Receiver Modules

T6 / R6

Application Circuit

The application circuits show how the QFMT6 transmitter and the QFMR6 receiver can easily be integrated

into a system to form a wireless link.

Figure 3: QFMT6 Quasar Transmitter Application Circuit

Figure 4: QFMR6 Quasar Receiver Application Circuit

RSSI Values:

The QFMR6 RSSI output provides a DC output proportional to the RF input signal. The table shows the

typical RSSI value depending on the RF signal strength

Note

that the region between –90 and –70 is with receiver AGC (automatic gain control) operating.

If required, a receiver version with AGC disabled can be provided as a factory pre-set option. This would

linearise the RSSI curve.

R. F. Solutions Ltd.,

Unit 21, Cliffe Industrial Estate,

Lewes, E Sussex, BN8 6JL, England

Tel +44 (0)1273 898 000

Fax +44 (0)1273 480 661

http://www.rfsolutions.co.uk

Email sales@rfsolutions.co.uk

R F Solutions is a member of the Low Power Radio Association.

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

RF Signal strength / dBm

-80

-70

-60

-50

-40

-30

-20

1.00

1.20

1.40

1.60

1.80

2.00

2.20

2.40

2.60

2.80

3.00

Typical RSSI Characteristics of the QFMR6

AGC

Action

RF Signal Strength / dBm

R

V

0

1

5

0

1

1

0

1

7

0

1

9

0

1

8

0

1

8

0

2

5

0

2

5

0

2

8

0

2

9

0

2

9

A0

A1

A2

A3

A4

A5

A6

A7

VSS

D8

D9

D10

D11

DIN

OSC2

OSC1

VT

VDD

1

2

3

4

5

6

7

8

910

11

12

13

14

16

18

HT12D

+5V

15

DATA OUT 1

DATA OUT 2

DATA OUT 3

DATA OUT 4

17

1K5

Ω

ΩΩ

Ω

Quasar

R 5

12

34 5 6 7

+5V

ANTENNA

T5

A0

A1

A2

A3

A4

A5

A6

A7

VSS

AD8

AD9

AD10

AD11

TE\

OSC2

OSC1

DOUT

VDD

1

2

3

4

5

6

7

8

910

11

12

13

14

15

16

17

18

HT12E

+5V

45

12

3

+5V

ANTENNA