TM 55-1510-222-10
Figure 3-5. SINCGARS AN/ARC-201(V)
an isolated, or guarded position requiring a pull and turn
operation to select. All primary power is applied;
however, transmitter keying is inhibited. When the
switch position is activated, the ECCM variables are
zeroed. The non-volatile RAM in the ECCM and control
modules are tested and the results displayed. This is
not an operational position but is used to clear the
TRANSEC variable.
(h)
STOW. In this position all
power is removed from the RT circuits including those
circuits energized by the holding battery. All functional
circuits and the non-volatile memory circuits are
inactive. This switch position is an isolated position,
requiring a pull and turn operation to select.
(2)
MODE Switch. The MODE switch is
used to select one of four basic operational modes. It is
a four-position switch with the fourth position used to
select a variation of the third or frequency hop (FH)
position.
The HOME switch position is not operable in this
installation.
When operating in the SC (single channel)
position the single channel mode of operation is
selected with the function switch in an operational
position. Manual selection of operating frequencies is
determined by the setting of the PRESET switch. With
the PRESET switch in MAN, frequencies are selected
via keyboard entry. With the PRESET switch in any of
the numbered positions (1 through 6) or CUE, preset
frequencies are selected. Offsets may be applied to
either manual or preset frequencies while in the SC
mode. The MODE switch must also be in the SC
position when loading preset frequencies. In this case,
however, the function switch must be in the LD (load)
position.
With the switch in the FH (frequency hopping)
position, the frequency hopping mode of operation is
selected. The PRESET switch positions (1 through 6)
now select a particular set of frequency hopping net
parameters. Position MAN and CUE of the PRESET
switch are invalid operating positions in the FH mode.
In MAN, the display will show "cold", and in CUE, the
display will show the frequency as though in SC. The
function switch must be in an operational position.
Switching positions of the PRESET switch will facilitate
rapid change in operating nets.
When the switch is in the FH-M (frequency
3-13
