Test Tone - Kenwood TKR-850 Service Manual

TKR-850
6) Priority+TalkBack : The TKR-850 always reverts to the
Priority channel. However, if a call is received on a chan-
nel other than the Priority channel and PTT is pressed
before scanning resumes, the transceiver "talks back"
on the current receive channel.
9. CW ID and Message
The TKR-850 contains internal automatic station identifi-
ers. The CW ID (Morse code) is set and transmitted on a
per-channel basis. The CW ID is transmitted when the in-
terval period is reached (TX Interval Time function), the
channel is changed (CW ID on Channel Change function) or
CW ID Onfunction is executed. When CW ID is activated by
any functions described above, it is actually sent after the
total time of TX Delay Time (not applied to CW ID On func-
tion) and CW Modulation Delay Time has expired. TX Delay
Time is a period from CW ID is activated to the transmitter is
keyed.
CW Modulation Delay is a period from the transmitter is
keyed to the CW ID tone is sent. The CW ID tone is routed
to the Receive Audio (RA) port and a speaker if the Send CW
ID to RA function is set to Yes. The TKR-850 contains 8
message banks for CW Message. CW Message 1 to 8 is
transmitted on the current channel when the CW Message
1 to 8 On function is activated, respectively.
10. PTT Priority
A number of keying sources can be used to cause the
TKR-850 to transmit.
The transmit audio path is switched according to their
keying sources and when PTTs is simultaneously activated,
the transmit audio path related to the PTT with higher prior-
ity is given priority. These are Local Microphone PTT, Exter-
nal PTT, and Repeat PTT.
11. Time Out Timer
The Time Out Timer function determines the period of
time users can continuously transmit. When the selected
period expires, the transmission is inhibited.
12. Repeat Hold Time
The Repeat Hold Time (hang timer) function is used to
prevent the repeater from being repeatedly keyed and
unkeyed in response to short message traffic. When a mo-
bile transceiver unkeys, the repeater's Hold Timer allows
the repeater to continue transmitting for a brief period while
waiting for a responding end user. If no valid QT/DQT is
detected within the Hold Timer period, the transmitter is al-
lowed to unkey. This function determines the period of time
that the transmitter is allowed to remain keyed after the loss
of a valid QT/DQT received signal.
10
OPERATING FEATURES
13. Take Over
wireline control of the repeater. When Take over function is
enabled, the external AUX inputs and Outputs, transmit au-
dio inputs and receive audio outputs, External PTT and Ex-
ternal Monitor lines are disabled. All AUX Input functions
assigned to any AUX Input stay in their current state. How-
ever External PTT and External Monitor switch to the "Off"
state.

14. Test Tone

is turned On and Off by toggling Test Tone On/Off functions.
The transmitter can be modulated without a local micro-
phone by using the test tone. When Test Tone On function
is executed and any PTT is activated, the TKR-850 transmits
the test tone with mic mute and also routes the test tone to
RA port.
15. RF Power
per-channel basis. When the TX High Power function is en-
abled, the transmission output is set to high power.
16. Fan Action
determines whether the fan is continuously operated or op-
erates in response to high temperatures only.
17. AUX Input and Output
20~25) and 3 programmable AUX Input Ports 1~3 (pins 4~6)
on the rear 25 pin D-Sub connector (CONTROL I/O) and 5
programmable AUX Output Ports 1~5 (pins 10, 11, 13~15)
on the rear 15 pin TEST/SPKR connector.
for remote control interfaces. Each AUX I/O Port can be set
for AUX Input, AUX Output, remote Channel Select or Multi
Table Select types. The AUX Input Port can be set execute
a single input function or a set of up to three functions when
the port is activated. If the port type for an AUX I/O Ports
1~6 is set for "AUX Input", it will also appear AUX Input
window for function programming. The input logic is fixed
as active Low.
function. If the port type for an AUX I/O Ports 1~6 is set for
"AUX Output", it will also appear AUX Output window for
function programming. The output logic of AUX Output can
be set as either active High or active Low by the Logic Type
function. Active High outputs a High (5V) when the pro-
grammed condition becomes valid, active Low outputs a
Low (0V) when the condition becomes valid.
The Take Over function is used to disable the external
The Test Tone is a single-frequency audio sine wave and
The TKR-850 is able to switch transmission output on a
The TKR-850 has a cooling fan. The Fan Action function
There are 6 programmable AUX I/O Ports 1~6 (pins
The 6 programmable AUX I/O pins are primarily intended
The AUX Output Port can be set execute a single output