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| -rw-r--r-- | 5.-KrakenSDR-Web-Interface-Controls.md | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/5.-KrakenSDR-Web-Interface-Controls.md b/5.-KrakenSDR-Web-Interface-Controls.md index 4e2c12b..aadb83e 100644 --- a/5.-KrakenSDR-Web-Interface-Controls.md +++ b/5.-KrakenSDR-Web-Interface-Controls.md @@ -329,18 +329,23 @@ Remember, these are measurements relative to CH-0, so for the KrakensDR with fiv If your VNA only provides TDR length measurements, you can easily convert cable delta measurements into time as long as you know the coax cable velocity factor. The formula is as follows, where c is the speed of light at 299792458, and vf is the cable velocity factor. -time_delta_x = ( cable_length_delta / (c * vf) ) * 10^9 +`time_delta_x = ( cable_length_delta / (c * vf) ) * 10^9` In the example below we have three cables with vf=0.66 with slightly different lengths that we'd like to compensate for. The time_delta in nanoseconds is given by: +``` Cable 0: 2.00130m Cable 1: 1.99933m Cable 2: 1.99910m +``` +``` cable_length_delta_1 = 2.00130m - 1.99933m = 0.00197m cable__length_delta_1 = 2.00130m - 1.99910m = 0.00220m - +``` +``` time_delta_1 = (0.00197m / (c * 0.66)) * 10^9 = 0.009956383ns time_delta_2 = (0.00220m / (c * 0.66)) * 10^9 = 0.011118803ns +``` -Repeat for Cable 2,3,4 and enter the values of time_delta_1,time_delta_2,time_delta_3,time_delta_4 into the `IQ Adjust Time Delay` box. (Do not add any time units like ns)
\ No newline at end of file +Repeat for Cable 2,3,4 and enter the values of `time_delta_1,time_delta_2,time_delta_3,time_delta_4` into the `IQ Adjust Time Delay` box. (Do not add any time units like ns)
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