Firmware Version 1.21
2/2/2010
8
The
AMP OUT
connector is an RCA jack. It can be used to key an amplifier, PTT line,
or other special applications. This signal is also optically isolated and driven by a solid
state relay; see the Specifications page for maximum ratings. The
AMP OUT
line is
polarity sensitive; the outer sleeve of the connector must be less positive than the center
pin. This means that if you are keying a positive signal, the outer shell should be
connected to ground and the center pin to the positive keying signal. If you are keying a
grid-block or other circuit that uses a negative keying voltage, the center pin would be
ground and the outer shell would be the negative voltage signal.
The
AMP OUT
signal will be active (on) whenever the
KEY OUT
signal is active
(except when using the
ST KEY
jack; see above), and will remain on during inter-
element gaps and for the entire duration of a message played from memory, and while the
transmitter is active in tune mode. The lead time and trail time can be set from command
mode. If the lead time is set, the
AMP OUT
signal will be active from 1 to 40
milliseconds before the transmitter is keyed. If the trail time is set, the
AMP OUT
signal
will be active for one to six element times after the last element is sent.
Figure 3 below shows an example of the signals as the operator sends a ‘V’ character. As
you can see, the
AMP OUT
signal will be active prior to the
KEY OUT
signal, and will
remain active until after the last element is sent. There is an adjustable lead and trail
time. The amp lead and trail times can be set to zero, in which case the
AMP OUT
signal
will precede the
KEY OUT
signal by only a fraction of a microsecond and drop as soon
as the character is finished.
Amp “lead time”, if set.
KEY OUT
AMP OUT
Keyed
Unkeyed
Keyed
Unkeyed
Amp “trail time”, if set.
Figure 4 - AMP OUT and KEY OUT timing