[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

*Subject*: [amsat-bb] Re: receiver sensitivity conversion question*From*: Grant Hodgson <grant@xxxxxxxxxxxxxxxxxxx>*Date*: Thu, 22 Mar 2007 09:33:12 +0000

Tyler Usually, an RF voltage is specified as potential difference (PD), i.e. the voltage when connected to a 50 ohm load. To convert uV to dBm :- i) work out the power in Watts :- P=V^2/R so 25uV equates to 12.5pW or 0.0000000000125W. ii) Multiply by 1000 to give the answer in mW; i.e. 0.0000000125mW. iii) Take the logarithm and multiply by 10 to give -79dBm. However, I'm not sure where 12.5uV comes from - a typical VHF receiver needs about 0.25uV or better - that's -119dBm; if your radio really needs 25uV then there is something seriously wrong. regards Grant G8UBN _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb

- Prev by Date:
**Re: CubeSat launch 27Mar07 6:46:35UT** - Next by Date:
**Re: CubeSat launch 27Mar07 6:46:35UT** - Prev by thread:
**FS: Dual receive HT-perfect for satellites** - Next by thread:
**DL74 Xe2AT** - Index(es):