# What is the lowest 100% POI the SPETRAN V6 can offer?

Quote from AdminTC on 4. August 2020, 13:19The SPECTRAN V6 advanced processing architecture combined with its 245MHz analysis bandwidth provides a 100% POI (

ProbabilityOfIntercept) for signals with durations as short as 49nS.The POI thow highly depends on the used FFT and is calculated as FFT/Samplingrate. But since we need at least a second FFT with 50% overlaping for a 100% POI our total FFT time will also increase by 50%.

The following table at different FFTs will make it more clear:

- FFT of
8@245MHz = 8/245Mio * 1,5 =49nS100% POI- FFT of
16@245MHz = 16/245Mio * 1,5 =98nS100% POI- FFT of
32@245MHz = 32/245Mio * 1,5 =196nS100% POI- FFT of
64@245MHz = 64/245Mio * 1,5 =392nS100% POI- FFT of
128@245MHz = 128/245Mio * 1,5 =784nS100% POI- FFT of
256@245MHz = 256/245Mio * 1,5 =1,6µS100% POI

- FFT of
512@245MHz = 512/245Mio * 1,5 =3,1µS100% POI- FFT of
1024@245MHz = 1024/245Mio * 1,5 =6,3µS100% POI- FFT of
2048@245MHz = 2048/245Mio * 1,5 =12,5µS100% POI- FFT of
4096@245MHz = 4096/245Mio * 1,5 =25µS100% POIAn even lower 100% POI down to

12nScan be achieved by directly triggering on the IQ power level by using ourRTSA Suite PROsoftware.

The SPECTRAN V6 advanced processing architecture combined with its 245MHz analysis bandwidth provides a 100% POI (**P**robability **O**f **I**ntercept) for signals with durations as short as 49nS.

The POI thow highly depends on the used FFT and is calculated as FFT/Samplingrate. But since we need at least a second FFT with 50% overlaping for a 100% POI our total FFT time will also increase by 50%.

The following table at different FFTs will make it more clear:

- FFT of
**8**@245MHz = 8/245Mio * 1,5 =**49nS**100% POI - FFT of
**16**@245MHz = 16/245Mio * 1,5 =**98nS**100% POI - FFT of
**32**@245MHz = 32/245Mio * 1,5 =**196nS**100% POI - FFT of
**64**@245MHz = 64/245Mio * 1,5 =**392nS**100% POI - FFT of
**128**@245MHz = 128/245Mio * 1,5 =**784nS**100% POI - FFT of
**256**@245MHz = 256/245Mio * 1,5 =**1,6µS**100% POI

- FFT of
**512**@245MHz = 512/245Mio * 1,5 =**3,1µS**100% POI - FFT of
**1024**@245MHz = 1024/245Mio * 1,5 =**6,3µS**100% POI - FFT of
**2048**@245MHz = 2048/245Mio * 1,5 =**12,5µS**100% POI - FFT of
**4096**@245MHz = 4096/245Mio * 1,5 =**25µS**100% POI

An even lower 100% POI down to **12nS** can be achieved by directly triggering on the IQ power level by using our **RTSA Suite PRO** software.