JTACS: Fixed channel allocation, but have no hardware to verify
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c6149ed3b4
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5335795759
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@ -71,6 +71,7 @@ double amps_channel2freq(int channel, int uplink)
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double freq;
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if (!tacs) {
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/* AMPS */
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if (uplink == 2)
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return -45.000 * 1e6;
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@ -86,6 +87,7 @@ double amps_channel2freq(int channel, int uplink)
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if (uplink)
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freq -= 45.000;
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} else if (!jtacs) {
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/* TACS */
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if (uplink == 2)
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return -45.000 * 1e6;
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@ -98,14 +100,23 @@ double amps_channel2freq(int channel, int uplink)
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if (uplink)
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freq -= 45.000;
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} else {
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/* JTACS */
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/* see "ARIB_STD-T64-C.S0057-0v1.0.pdf" */
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if (uplink == 2)
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return -55.000 * 1e6;
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/* 799 channels */
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if (channel < 1 || channel > 799)
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if (channel >= 1 && channel <= 799)
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freq = 860.0125 + (channel - 1) * 0.0125;
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else if (channel >= 801 && channel <= 1039)
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freq = 843.0125 + (channel - 801) * 0.0125;
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else if (channel >= 1041 && channel <= 1199)
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freq = 832.0125 + (channel - 1041) * 0.0125;
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else if (channel >= 1201 && channel <= 1600)
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freq = 838.0125 + (channel - 1201) * 0.0125;
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else
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return 0;
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freq = 860.0125 + (channel - 1) * 0.025;
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if (uplink)
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freq += 55.000;
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