diff options
| author | Andreas Eversberg <jolly@eversberg.eu> | 2022-07-04 19:29:41 +0200 |
|---|---|---|
| committer | Andreas Eversberg <jolly@eversberg.eu> | 2022-07-23 08:26:42 +0200 |
| commit | 53357957591c0276eff7bb8983f6773820c6f1ac (patch) | |
| tree | 6d9df1c6a0ea3459d29a2cd51f68bf7e0c5a6544 /src | |
| parent | c6149ed3b4164940850747e7baf5bb73affa04c0 (diff) | |
JTACS: Fixed channel allocation, but have no hardware to verify
Diffstat (limited to 'src')
| -rw-r--r-- | src/amps/amps.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/src/amps/amps.c b/src/amps/amps.c index 870da27..f6f80df 100644 --- a/src/amps/amps.c +++ b/src/amps/amps.c @@ -71,6 +71,7 @@ double amps_channel2freq(int channel, int uplink) double freq; if (!tacs) { + /* AMPS */ if (uplink == 2) return -45.000 * 1e6; @@ -86,6 +87,7 @@ double amps_channel2freq(int channel, int uplink) if (uplink) freq -= 45.000; } else if (!jtacs) { + /* TACS */ if (uplink == 2) return -45.000 * 1e6; @@ -98,14 +100,23 @@ double amps_channel2freq(int channel, int uplink) if (uplink) freq -= 45.000; } else { + /* JTACS */ + /* see "ARIB_STD-T64-C.S0057-0v1.0.pdf" */ if (uplink == 2) return -55.000 * 1e6; /* 799 channels */ - if (channel < 1 || channel > 799) + if (channel >= 1 && channel <= 799) + freq = 860.0125 + (channel - 1) * 0.0125; + else if (channel >= 801 && channel <= 1039) + freq = 843.0125 + (channel - 801) * 0.0125; + else if (channel >= 1041 && channel <= 1199) + freq = 832.0125 + (channel - 1041) * 0.0125; + else if (channel >= 1201 && channel <= 1600) + freq = 838.0125 + (channel - 1201) * 0.0125; + else return 0; - freq = 860.0125 + (channel - 1) * 0.025; if (uplink) freq += 55.000; |