jotron TA-7650C User Manual

Jotron AS| TR7750C: Operators Manual  Operating Instructions
Page 5-10
P/N: 84748 (G)
Menu path:
TX config ►
Parameter
Range
Default
Details
Keying
Source
Mic, line, txkey,
txgnd, inband
Mic, txkey
Determines what signal that will be used as
the source for keying the transmitter.
Any combinations can be set
 Mic: Local PTT input from a
microphone, where the PTT is
connected to pin 4 and 8(gnd) on
the Mic/headset connector.
 Line: Keying from a phantom
signal on the line input. Pin 3 and 6
on the REM connector.
 Txkey: The transmitter is keyed by
an external voltage on the
TXKEY_P and TXKEY_N input
pins. Signals located on Pin 7 and
8 on the | connector.
 Txgnd: The transmitter is keyed
by a signal on the TXKEY_G input
pin Signals are located on Pin 4
and 8 (gnd) on the REM
connector.
 Inband: The transmitter is keyed
using an inband tone (see also
inband frequency and inband
sensitivity)
Keying
Inband frequency
100 – 5000 Hz
1 Hz steps
5000
Set the frequency to be used for the inband
tone that will be used to key the transmitter.
By selected the tone frequency to use, the
transmitter will automatically calculate the
notch filter to use an insert this into the audio
path. Applicable to the line interface input
only.
Keying
Inband trig level
-40 to -10 dBm
-30
The level of the tone used to key the
transmitter on the 600ohm input line.
The value is given in dBm (absolute level
related to 600 ohm). Values above the limit
will key the transmitter.
See also Keying source and Inband
frequency.
Keying
TX Timeout
OFF | 15-300 s
1s steps
OFF
Set the timeout for the key signal. If the PTT
is pressed longer than this timeout, the
transmitter will automatically stop
transmitting. The transmitter will
automatically reset the timer when the key
signal is released.
Keying
RF delay
0 – 200 ms
0 (OFF)
This setting is useful when the transmitter is
used together with external equipment such
as T/R relays, power amplifier or other
equipment that includes RF switchover
relays.
Since the RF switching in the transmitter is
done electronically, the RF is produced in
less than 10ms after the PTT signal is
detected. It could be harmful for the external
relays if the RF is applied to them before
switchover has occurred.
In order to delay the RF carrier this
parameter should be used under such
circumstances. A reasonable setting should
be in the order of 40-50 ms.

jotron TA-7650C Specifications

General

Brand	jotron
Model	TA-7650C
Category	Radio
Language	English