Technical description
4-42 HF SSB Transceiver 9323/9360/9390/9780 Technical Service Manual
The power is then applied to the fan, which is connected between the parallel pins
1–2/3–4.
When transmitting for up to 5 minutes and on release of the PTT, the fan
continues to operate for a further 30 seconds. However, if the transmission
exceeds 5 minutes, the fan will continue to run for a further 5 minutes, after
returning to Receive mode.
Option GP
Option GP is available to operate equipment such as teletype, modems etc. The
connector J303 provides the following facilities:
Table 4 -16: Connector J303 functions
Pin No. Function Remarks
10 V
2 Receive audio output
3 Transmit audio input
4 Quiet line input Selects selcall mute
5 Alarm input Active low for warning beeps
6 PTT Selects transmit—no time out
7 Scan High when scan selected
8 Battery supply Nominal 13.6 V
9 RS232 Rx Data to TCVR
10 RS232 Tx Data from TCVR
Option M
Option M is available for the transmission of morse code. There is an external
morse key connected to J204 [1 04-02976 Sheet 2]. When keyed, it transmits an
800 Hz tone from IC106 pin 13 on the selected channel.
Option PH
Option PH provides the connection for a headset. A 6.4 mm switched jack socket
can be fitted to the transceiver front panel and connected to the loudspeaker circuit
[1 04-02971]. Insertion of the jack in the socket mutes the loudspeaker by
breaking the loudspeaker circuit.
The headset signal is slightly attenuated by two 330 Ω resistors in the line. This
makes volume adjustment unnecessary when changing to or from headset
operation. This option is only applicable to front control transceivers.
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