Operating The Transmitter - SEA 222 Operator's Manual

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222 rear panel. The antenna coupler will signal that it has suc-
cessfully tuned the antenna by pulling the "TND" line low. This will
activate the "TUNED" indicator on the VF display. This indicator is an
asterisk (*) in the SECOND MOST SIGNIFICANT digit of the VF display.
Once activated, the "TUNED" indicator will remain lit UNTIL A FREQUENCY
CHANGE TAKES PLACE. At that time the indicator will
extin~uish,
since
a properly tuned antenna is no longer assured. Once extinguished, the
"TND" line must again be pulled low to activate the indi.cator.
2.6 OPERATING THE TRANSMITTER
The operation of the transmitter is straightforward. Pressing the
microphone push-to-talk button will switch the transmitter circuits on.
This will be indicated by the VF display changing to the transmitter
frequency and the "TRANS" indicator will light dimly. Speak in a
normal voice with your lips approximately one inch from the microphone.
Do NOT shout into the microphone as this may reduce the intelligibility
of the transmission. The "TRANS" indicator should modulate with the
voice, indicating normal power output. Note that acknowledgment of a
message cannot be done by keying the microphone, si nee no s i gna 1 is
transmitted until the operator -actually speaks.
If the SEA 222 is fitted with an antenna coupler such as the SEA
1612, the "antenna tuned" status flag from the coupler will cause the
SECOND MOST SIGNIFICANT digit in the VF display to indicate as asterisk
(*) when the coupler has properly tuned the am;enna system. (See 11
2.5.9.)
3. PROGRAMMING
3.1
FREQUENCY AND MODE SELECTION
As discussed above, the SEA 222 contains TWO memory systems. The
factory programmed frequencies are listed in 11 3.4 and are stored in
_the operating system ROM. Normal access to these frequencies is
through the channel number system described above. (See 11 2.5.5.) In
addition to those frequencies contained in the factory prograrrmed
memory, the operator may program up to 100 frequency pairs into the
non-volatile EEPROM memory referred to as
11
scratchparl
11
memory. This
memory is arranged as 100 "bins
11
or locations and each bin is designed
to hold one channel. A channel consists of TWO frequencies, a
TRANSMITTER frequency and a RECEIVER frequency.
The frequencies selected for entry into the scratchpad memory must
be legally authorized for the desired operating service.
I