Frequency-guard disruption

[kaklik]

A single frequency measurement error results in the unrealistically high std-dev value.

#timestamp,LO_Frequency,Hit,StdDev 1501828275.9,286046995.2,N,1.7
1501828295.7,286046995.5,N,1.7
1501828315.6,286046996.1,N,1.7
1501828335.4,286046993.4,P,1.6
1501828355.3,286046996.5,N,1.5
1501828375.1,286041928.5,P,2194.0
1501828376.0,286046997.4,N,2027.0
1501828395.8,286046997.9,N,1888.7
1501828415.7,286046997.5,N,1773.4
1501828435.5,286041825.7,N,2216.9
1501828455.4,286046999.2,N,2128.6
1501828475.2,286046999.6,N,2048.2
1501828495.0,286046999.2,N,1975.0
1501828495.9,286046999.2,N,1908.4
1501828515.8,286046996.7,N,1847.6
1501828535.6,286046997.7,N,1791.9
1501828555.5,286046997.9,N,1740.7
1501828575.3,286046998.0,N,1693.5
1501828595.1,286046997.7,N,1649.9
1501828615.9,286046997.6,N,1609.3
1501828635.7,286046997.0,N,1571.5
1501828655.6,286046997.0,N,1536.2
1501828675.4,286047001.2,N,1503.2
1501828695.2,286046999.4,N,1472.2
1501828715.1,286046999.5,N,1443.0
1501828716.0,286046999.5,N,1415.4
1501828735.8,286046996.6,N,1389.3
1501828755.7,286046999.1,N,1364.6
1501828775.5,286046999.5,N,1341.2
1501828795.3,286046994.9,N,1318.9
1501828815.2,286046995.2,N,1297.6
1501828835.0,286046997.6,N,1277.4
1501828835.9,286046997.6,N,1277.4
1501828855.8,286046995.0,N,1277.4
1501828875.6,286046996.9,N,1277.4
1501828895.4,286046996.6,N,928.4
1501828915.3,286046996.8,N,928.4
1501828935.1,286046997.8,N,928.4
1501828955.8,286046997.9,N,928.4
1501828975.7,286046996.8,N,1.5
1501828995.5,286046995.4,P,1.2
1501829015.4,286046999.5,N,1.7
1501829035.2,286046996.9,N,1.5

The identified single error measurement should be trowed away instead of saving to the samples buffer.