3: Operation
PRC1077-MSOP 3-7
The PRC28 operates from 30 MHz to 42 MHz, leaving the PRC1077 with an
unusable frequency range from 43 MHz to 87.975 MHz when communicating
with the PRC28 transmitter.
These unusable frequencies can provide security and protection from jamming
if an enemy is using a PRC77 or PRC28 transmitter.
Frequency
Spacing
The PRC1077 provides frequency spacing of 25 MHz whereas the PRC77 has
50 MHz frequency spacing so the PRC1077 cannot use frequencies ending in
25 kHz and 75 kHz when communicating with a PRC77 transceiver. The
PRC28 has 100 kHz frequency spacing, limiting the usable frequencies to
even 100 kHz frequencies. Again, these unused frequencies can provide both
security and protection.
Squelch System Some transceivers do not include 150 Hz tone in the squelch mode. The
PRC1077 can receive transmissions with or without 150 Hz tone in squelch
mode. If a station does not respond to transmission with the Function switch
set to SQUELCH, set the Function switch to TONE to transmit 150 Hz tone
signal.
Voice Security
The PRC1077 can be fitted with an optional TACSEC-II device to provide
embedded tactical voice security. The TACSEC-II voice security module is
mounted underneath the Audio board.
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