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Transmit level adjustment
The data drive level (transmit audio voltage, TXA) from the KAM’98 to your ra-
dio is adjusted digitally, using your keyboard and the transmit level (XMITLVL)
or the calibrate (CAL) command. Previous models (e.g., KAM, KAM Plus) used
a set of jumpers and/or an analog potentiometer (pot) to set this level. With the
KAM’98, no jumpers are used, just a command.
The drive level you set will depend upon the mode you will operate and the type
of transceiver you will be using.
For most HF non-packet modes, such as RTTY, AMTOR, Pactor, or G-TOR,
drive level should be set to match that required for single side band voice opera-
tion with most HF transceivers. For FM packet operation, drive level is set to ob-
tain 3.5 kHz deviation (of the transmitted signal).
For HF modes
For HF modes set the drive level as follows: With your HF rig set in LSB and at-
tached to a dummy load, use the CAL command to increase drive level until the
audio (mic) drive LEVEL is set as you would in voice mode. With most trans-
ceivers the ALC meter reading should be set to full scale. See the CALIBRATE
command, in the Command Reference, for details.
For FM packet operations
For FM packet operations, adjust the drive level to provide 3 to 3.5 kHz of devia-
tion in your radio. If your radio is not metered to measure deviation, use a second
transceiver as a monitor and adjust the drive level of your packet transmission to
generate about the same audio sound as packets heard form other stations. Alter-
natively, adjust drive level while sending unproto packets via a nearby digipeater
until your signal is repeated by that station consistently.
The XMITLVL command has a parameter default value of 100; this corresponds
to a drive voltage of about 50 mV. You may change this level by increasing the
parameter/count. For counts below 256, the voltage is increased in 1/2 mV steps;
above that, the drive increases roughly 15 mV per step.
+ For details, see the description of the XMITLVL command in the “Command
Reference.”
Installing Your KAM’98
Connect Your KAM’98 to Your Transceiver
User’s Guide
66
KAM’98 v 8.3
Содержание KAM 98
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Страница 160: ...blank page Non Packet Modes of Communication RTTY Operation User s Guide 142 KAM 98 v 8 3...
Страница 342: ...blank page Command Reference KAM 98 Commands User s Guide 324 KAM 98 v 8 3...
Страница 376: ...ASCII Chart paste in page 1 of 2 ASCII chart Appendix E Additional Information ASCII Chart User s Guide 358 KAM 98 v 8 3...
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