Kenwood TH-D72 Operation Manual - Page 50

Problem When using a GPS receiver, you cannot correctly transmit position data. You cannot receive any APRS data. "MCP ERR" appears on the display. (MCP-4A communications error) Probable Cause The GPS receiver did not yet start correct measurement. You did not correctly program a group code. 1 Loose cable connection. 2 Your PC may be trying to process too much at once. 3 There are other reasons as to why communications was not possible. Corrective Action Before starting correct measurement, the GPS receiver generates a lowpitch tone every 10 seconds. When starting correct measurement, it generates a high-pitch tone. (If not using the internal GPS receiver, press [F], [MARK] and select "OFF"). Access Menu 3S0 and program "APK003". 1 Ensure that the connection between the TH-D72 and the PC is correct. 2 Shut down other software that you may be running. 3 Turn the TH-D72 power source OFF and ON, one time. Concerning the received frequency display, an unmodulated signal may be received. This is according to the set intrinsic frequency form. (144 MHz + 49.95 MHz) x 2 - (430 MHz - 45.05 MHz) = 45.05 MHz, 49.95 MHz VxU reception (144 MHz + 49.95 MHz) x 4 - (430 MHz - 45.05 MHz) x 2 = 45.05 MHz, 49.95 MHz (430 MHz - 49.95 MHz) - (144 MHz + 45.05 MHz) x 2 = 45.05 MHz, 49.95 MHz UxV reception (430 MHz - 49.95 MHz) x 2 - (144 MHz + 45.05 MHz) x 4 = 45.05 MHz, 49.95 MHz GPS setting: 16.369 MHz x n (n = multiple) 40