FR/FX5000 SERIES CTCSS/VOTING/PIPTONE OPTIONS PCB

INTRODUCTION

The CTCSS/Voting/Piptone PCB is an option which may be fitted to the FR/FX5000

series base stations. When fitted, it is Located in the Control Module where

it is mounted on the Control Logic PCB and electrically connected to the Front

Panel PCB.

CTCSS  (67 ,Hz - 250,3Hz )

The CTCSS circuits provide sub-audio signaling facilities for FR/FX5000 series

base stations when used in CTC55 (Continuous Tone Controlled Squelch System)

applications. In the receive mode, the decode facility is used to inhibit the

audio path to the loudspeaker pending receipt of the correct tone. In the

encode mode, activated by the press-to-transmit switch, the sub-audible tone is

used to modulate the outgoing carrier.

Voting

The Voting circuits facilitate the automatic selection of the 'best' of a

number of base station sites within range of a calling mobile. The Voting

requirement is for the equipment to ensure that only intelligible signals are

considered for selection purposes, and to automatically select the strongest

signal. The basis for assessing the signal strength is receiver noise and

carrier level as measured at the base station.

Piptone

Where a requirement exists to indicate that a channel is 'busy' provision is

made to key the transmitter when the squelch opens to enable the transmission

of a piptone. The piptone generator, when activated by a piptone enable input

from the Control Logic PCB, provides a tone which is combined with the CTCSS

tone and fed to the transmitter audio circuitry.

Fitting instructions

More information can be seen at these links below

http://www.freewebtown.com/hamradio/DTMF_Board/CTCSS-Voting-Piptone_Opt_PCB.pdf

http://www.freewebtown.com/hamradio/DTMF_Board/Voting-CTCSS_PCB_Circuit_Diag.pdf

http://www.freewebtown.com/hamradio/DTMF_Board/Voting-CTCSS_PCB_Layout_Diag.pdf