SECURE BASIC

CH = 15

Figure 10-90 Basic Programming Screen 1

9. Press the DOWN arrow key to move to the second Basic programming screen.

RX FREQUENCY RX SQUELCH TONE MODULATION TX = 167.56250 TX SQUELCH TONE TRAFFIC RATE FM 16K TEK 5 COMSEC KEY TX FREQUENCY RX = 167.56250 R = 74.4 T = 74.4

Figure 10-91 Basic Programming Screen 2

10. The second Basic screen opens with the selection outline around the receive frequency (RX). To change the receive frequency, press ENT to enable the change mode. The rightmost significant digit will be in reverse video (white on black). Press the ALT and UP arrow keys to move the highlighting to the leftmost digit. Use the UP and DOWN arrow keys to scroll through the numbers. Note that only 0-5 is available for this position. Press the ALT and UP arrow keys again to move to the next digit. Again use the UP and DOWN arrow keys to scroll through the numbers (now 0-9 are available). When the new frequency is entered, press ENT to confirm and move the selection outline to the next value, transmit frequency (TX). Note that when the receive frequency is changed, the transmit frequency also changes to the same value.

11. To change the transmit frequency, press ENT to enable the change mode. The rightmost significant digit will be in reverse video (white on black). Press the ALT and UP arrow keys to move the highlighting to the leftmost digit. Use the UP and DOWN arrow keys to scroll through the numbers. Note that only 0-5 is available for this position. Press the ALT and UP arrow keys again to move to the next digit. Again use the UP and DOWN arrow keys to scroll through the numbers (now 0-9 are available). When the new frequency is entered, press ENT to confirm and move the selection outline to the next value, receive squelch tone (R). Note that when the transmit frequency is changed, the receive frequency does not change.

TX = 167.56250 FM 16K TEK 5 RX = 167.56250 R = 74.4 T = 74.4

R = 74.4

Figure 10-92 Basic RX CTCSS Tone

12. The receive squelch tone is a Continuous Tone Coded Squelch System (CTCSS). In this system, a specific low-frequency sub-audible audio tone is sent along with the voice communication on the radio channel. If the receiving radio recognizes the tone being sent, it will open the squelch and allow the transmitting radio to be heard on the other side. Conversely, no other stations but ones transmitting the correct tone will be heard on the receiver side. CTCSS tones are only available on FM and NB clear channels. The standard CTCSS tones are coded in the radio. To set the receive CTCSS tone, press ENT

video (white on black). Use the UP or DOWN arrow key to scroll through the available values. When the desired value is on the screen, press ENT to confirm the selection and move the selection outline to the next value, transmit squelch tone (T). Note that when the receive CTCSS tone is changed, the transmit CTCSS tone changes to the same value. 13. To set the transmit CTCSS tone, press ENT when the selection outline is around the T=

XX value. The value will change to reverse video (white on black). Use the UP or DOWN arrow key to scroll through the available values. When the desired value is on the screen, press ENT to confirm the selection and move the selection outline to the next value, modulation. Note that when the transmit CTCSS tone is changed, the receive CTCSS tone does not change.

TX = 167.56250 RX = 167.56250 R = 74.4 T = 74.4

FM 16K TEK 5FM

Figure 10-93 Basic Modulation Setting

14. The available modulation types are AM, FM, and NB. To change the type, press ENT when the selection outline is around the value. The value will change to reverse video (white on black). Use the UP or DOWN arrow key to scroll through the available values. When the desired value is on the screen, press ENT to confirm the selection and move the selection outline to the next value, traffic rate.

15. Traffic rate is the transmission rate of the encrypted digital signal, either 12 or 16 kilobits per second (kbps). The default value is 16 kbps, the value for VINSON-compatible (KY- 57) encrypted signals. 12 kbps is used for FED-STD-1023 encryption. To change the value, press ENT when the selection outline is around the value. The value will change to reverse video (white on black). Use the UP or DOWN arrow key to toggle between the two values. When the desired value is on the screen, press ENT to confirm the selection and move the selection outline to the next value, COMSEC Key.

TX = 167.56250 RX = 167.56250 R = 74.4 T = 74.4

FM 16K TEK 5TEK 5

Figure 10-94 Basic COMSEC Key

16. COMSEC Key refers to the Traffic Encryption Key (TEK) location assigned to the MBITR channel. Available key locations are TEK 1-5. When assigning a TEK to a channel that is intended for SECURE operation, make sure that a valid COMSEC key is loaded in that location (see paragraph 10.12). To change, press ENT to enable the change mode and use the UP or DOWN arrow keys to scroll through the choices. When the desired setting is on the screen, press ENT again to confirm. When all selections are set on this screen, and the selection outline is around the last value, press the DOWN arrow key to move to the last Basic channel programming screen.

CRYPTO SYNCHRONIZATION SQLCH 8 DB FADE BRIDGE SQUELCH LEVEL REPEATER DELAY FADE 2.0S