6871620L01-C
May 28, 2008
VOCON Section
3-25
Figure 3-9. Control Top Flex
3.2.4.7 System Clocks
The Patriot is supplied with two clocks:
1. The first clock, a 16.8 MHz sine wave, comes from the RF transceiver portion of the radio. It
is conditioned by the clock buffer circuit, which includes Q1402, R1416, R1417, R1418,
R1415, C1402, C1403 and C1404.
2. The other clock supplied to Patriot is a 32.768 kHz square wave. This clock is generated by
the external 32.768kHz crystal Y1301, and a clock buffer circuit that includes U1302, R1304,
R1305 and C1303. This signal is supplied to the CKIL pin on the dual-core processor.
3.2.5
VOCON Audio Paths
This section describes the VOCON transmit and receive audio paths.
Figure 8-16 on page 8-16 and page 8-17
for schematic details of the following discussion.
UC_EMERG
EMERGENCY
Button
CLEAR/SECURE
Button
Programmable
Button
INT_PTT
PTT Button
UC_KP_ROW7
UC_KP_COLUMN0
UC_KP_COLUMN1
VOLUME Up
Button
VOLUME Down
Button
R9913 91K
R9914 68K
R9915 150K
Top Control Flex
UC_EMERG
EMERGENCY
Button
CLEAR/SECURE
Button
Programmable
Button
INT_PTT
PTT Button
UC_KP_ROW7
UC_KP_COLUMN0
UC_KP_COLUMN1
VOLUME Up
Button
VOLUME Down
Button
R9913 91K
R9914 68K
R9915 150K
Top Control Flex
Summary of Contents for ASTRO XTSTM 4000
Page 1: ...COLOR CHORDS 7 ASTRO XTSTM 4000 Portable Radio Detailed Service Manual ...
Page 2: ......
Page 16: ...May 28 2008 6871620L01 C xiv Commercial Warranty Notes ...
Page 22: ...May 28 2008 6871620L01 C 1 6 Introduction Notes ...
Page 26: ...May 28 2008 6871620L01 C 2 4 Radio Power Notes ...
Page 56: ...May 28 2008 6871620L01 C 3 30 Theory of Operation Notes ...
Page 100: ...May 28 2008 6871620L01 C 6 8 Troubleshooting Waveforms Notes ...
Page 194: ...May 28 2008 6871620L01 C B 2 Motorola Service Centers Notes ...
Page 204: ...May 28 2008 6871620L01 C Glossary 10 Glossary Notes ...
Page 209: ......