Bandwidth Limitations; Entering The Program Mode - SEA 222 Operator's Manual

When the SEA 222 is to be used in services other than-the Marine
Service, it is possible to provide a special program "mask" for the
permanent memory. Contact the Factory for information.
3.2 BANDWIDTH LIMITATIONS
3.3
3.3.1
. 3.3.2 .
The only limitations imposed by the SEA 222 is that the desired
frequency be inside the operating range of the equipment. Totally
unrelated duplex pairs might be employed, since the computer controls
the filter bandswitching. In practice, the antenna system will have a
great deal to do with dictating the maximum allowable frequency sepa-
ration. If a wide bandwidth antenna system such as a Conical Monopole
is used, it is conceivable that the transmitter could operate in thP.
~2
MHz band while the receiver was operating on 2000.0 KHz. If the
companion SEA 1612 automatic antenna coupler is used in conjunct ion
with the normal short whip, the allowable 2 MHz split may be reduced to
a few hundred KHz.
FIELD PROGRAMMING THE SEA 222 SCRATCHPAD MEMORY
ENTERING THE PROGRAM MODE
The SEA 222 is forced into the PROGRAM mode by entering the number
8888888 (seven
#
8s}. The operating system should signal the operator
that the SEA 222 has shifted to the PROGRAM mode by flashing "PROGRAM"
on the VF display. After a short delay, the operating system will
signal the operator to proceed by prompting "BIN
# ?" •
ENTERING SCRATCHPAD FREQUENCY AND MODE DATA
After the SEA 222 has shifted to the PROGRAM mode, the operator should
select and enter the desired BIN number, such as BIN 10. This would be
done by keying in the sequence "1, 0, ENT". If the selected bin
location is full, the operating system will respond with the prompt
"13IN FULL". This prompt will be held for approximately 2 seconds. If
it is desired to "overwrite" the bin location with new data, simply hit
the "EMER" key or any NUMBF.R key during the ~ second hold.
If
the
operator does NOT make an entry at this time, the operating system will
assume that the data in the chosen bin location is to be saved and will
again prompt "BIN
#
?".
This will allow the operator to chose another
bin location number.
Once the desired bin location is selected, the operating system will
prompt "TX FREQ". The operator should. then enter the desired
TRANSMITTER frequency down to and including the 100 Hz increment.
EXAMPLE: 1, 2, 4, 2, 9, 2, ENT. This will enter the frequency of
I