pk232.28
The manual is quite corect in all respects EXCEPT where they
discuss setting the DCD THRESHOLD control and receiver audio
output level for proper demodulation and DCD circuit
operation. The correct way to set these adjustments is as
follows:
1. At least temporarily, arrange to be able to hear
the receiver audio signal which is being sent to
the PK-232.
2. Set the squelch circuit on the radio for normal
squelched operation. The DCD circuit in the PK-232
is incapable of proper operation with unsquelched
audio from the receiver.
3. While monitoring incoming packets adjust the
receiver audio level so that the tuning indicator
"spreads" fully when receiving a packet from the
station on the channel which produces the LEAST
amount of audio output level. There are several
limiters in the PK-232 demodulator so louder
stations will not be affected adversely by this.
4. Once the audio level is properly set, adjust the
DCD THRESHOLD control on the PK-232 so that the DCD
led lights when there is a packet being transmitted
by the station on channel which produces the LEAST
amount of audio output from the receiver. Make
sure, however, that the DCD LED is extinguished
when the circuit has cut off all audio from the
receiver.
If the above procedure is followed, the PK-232 will properly
hold off transmitting during a packet transmission from
another station and will not send acknowledgements to
individual frames of a maxframe greater than 1 packet while
it is still being transmitted.
We hope PK-232 owners will find this information useful and
take steps to assure that their DCD is operating properly.
Multiple access packet channel throughput is severely
degraded when DCD is not working.
73 and happy packeting,
Eric Gustafson N7CL
GW1NGL NA7KR Kevin Roberts Ham Radio
Page last updated on 09/10/2012 by Kevin Roberts NA7KR a colection of Ham Radio and Electronic Information
The manual is quite corect in all respects EXCEPT where they
discuss setting the DCD THRESHOLD control and receiver audio
output level for proper demodulation and DCD circuit
operation. The correct way to set these adjustments is as
follows:
1. At least temporarily, arrange to be able to hear
the receiver audio signal which is being sent to
the PK-232.
2. Set the squelch circuit on the radio for normal
squelched operation. The DCD circuit in the PK-232
is incapable of proper operation with unsquelched
audio from the receiver.
3. While monitoring incoming packets adjust the
receiver audio level so that the tuning indicator
"spreads" fully when receiving a packet from the
station on the channel which produces the LEAST
amount of audio output level. There are several
limiters in the PK-232 demodulator so louder
stations will not be affected adversely by this.
4. Once the audio level is properly set, adjust the
DCD THRESHOLD control on the PK-232 so that the DCD
led lights when there is a packet being transmitted
by the station on channel which produces the LEAST
amount of audio output from the receiver. Make
sure, however, that the DCD LED is extinguished
when the circuit has cut off all audio from the
receiver.
If the above procedure is followed, the PK-232 will properly
hold off transmitting during a packet transmission from
another station and will not send acknowledgements to
individual frames of a maxframe greater than 1 packet while
it is still being transmitted.
We hope PK-232 owners will find this information useful and
take steps to assure that their DCD is operating properly.
Multiple access packet channel throughput is severely
degraded when DCD is not working.
73 and happy packeting,
Eric Gustafson N7CL
GW1NGL NA7KR Kevin Roberts Ham Radio
Page last updated on 09/10/2012 by Kevin Roberts NA7KR a colection of Ham Radio and Electronic Information