I sure did. Thanks to you Jeff for your response and my sincerest apology to Kevin. I did the calculation four times and got the same wrong answer four times before I hit the send button. Only after I sent did I redo the calculation on another calculator and was I horrified to learn of my mistake. It's time for a new calculator for me. And then the computer crashed. Time for a new computer too. AC
________________________________ From: Jeff DePolo <j...@broadsci.com> To: Repeater-Builder@yahoogroups.com Sent: Tue, July 27, 2010 11:09:55 AM Subject: RE: [Repeater-Builder] Re: Repeater receiver testing > Kevin, I'm sorry to have to tell you this but I think your > calculator batteries need to be changed. > 0 dBM = 0.2236 volts in a 50 Ohm circuit. > +20 dBM is indeed 100 mW and P=EI and inserting 100 mW into > the Eq. for Volts in a 50 Ohm system, E= the sq. rt. of the > quantity (.100 x 50) = sq. rt. of 5 = .707 V. or 707 mV. not > the 2.24 V. you indicated. I think you blew that one OM. Too much tequila down in XE land perhaps? The square root of 5 is 2.2236 volts, not sure where you got 0.707, that would be square root of 0.5. Kevin was right. Or, to make it even simpler without having to do any real math, +20 dBm is 20 db greater than 0 dBm. 20 dB more than 0.2236 volts is, obviously, 2.236 volts. --- Jeff WN3A
