Yes, that's right, 3 dB per trip to and from the load. Not 3 dB in total as I indicated.
Paul, W9AC ----- Original Message ----- From: "Tom W8JI" <[email protected]> To: "Paul Christensen" <[email protected]>; <[email protected]> Sent: Wednesday, April 21, 2010 7:05 PM Subject: Re: [Elecraft] attenuator in amp was Re: K3 and Expert 1K-FA > 30-watts dissipating as heat in the front end of the amp. The 3dB pad does > improve return loss into the amp input by the same amount. But, the > effective gain factor of the amp is then reduced by 3dB.>>> > > A 3dB pad gives 6 dB return loss. For example if load SWR is 2:1 (5.5dB > RL) and we add a 3 dB pad, return loss is 9.5 dB (1.4:1 SWR). > > A 3 dB 50 ohm pad with an open circuited output looks like 150 ohms. You > can make a 3:1 SWR test fixture by opening and shorting the output. > > > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
