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Preliminary - Subject to Change Without Notice
5.D.(1)(j) External Modem Audio Input High/Low- (J10531-42/62) EXT
5.D.(1)(k) Voice Push-To-Talk HI- (J10531-16) VO PTT H
Revision 0
10640I00.SLK
KHF 1050 SYSTEM INSTALLATION MANUAL
The KRX 1053 Receiver/Exciter interprets a resistance
of ten ohms or less between the EXTERNAL DATA KEYLINE
HI and LO pins as a command to transmit, whether the LO
pin is grounded or left floating.
This input is continuously read.
MODEM AUD INP H/L
The audio signal level is typically 0.775 VRMS across
600 ohms.
The KRX 1053 Receiver/Exciter presents a balanced,
floating 600 ohm load to this signal.
This input does ot present direct-current bias to the
signal source.
There is no audio clipping or compression associated
with this input at levels below 1.55 VRMS when adjusted
as in paragraph one above.
This input is factory adjusted so that at standard
temperature and primary power voltage, a 1 kHz modem
input signal of 0.775 VRMS yields full Data USB output
power from the KRX 1053 Receiver/Exciter and an input
of 0.39 V yields 6 dB +/-0.5 dB more output power than
that obtained with 0.775 V of input signal.
When the external resistance between the VOICE
PUSH-TO-TALK HI and LO pins is ten ohms or less, the
KRX 1053 Receiver/Exciter activates the transmitter and
uses the audio at the MIC AUDIO INPUT as the modulation
source.
The KRX 1053 Receiver/Exciter drives a current of at
least ten milliamps through any resistance of ten ohms
or less between the VOICE PUSH-TO-TALK HI and LO pins.
The KRX 1053 Receiver/Exciter interprets a resistance
of ten ohms or less between the VOICE PUSH-TO-TALK HI
and LO pins as a command to transmit, whether the LO
pin is grounded or left floating.
N
23-10-09
Page 2033
Mar/2003
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