I would say no to all three questions. The input impedance to the amp will not be the same when it is not powered and driven. The SWR indication on the driver will give you some idea of the input impedance. It should not hurt the antenna analyzer if the amplifier is not powered, but I don't think it will tell you anything useful. With power on the amp, it might.
Willis 'Cookie' Cooke K5EWJ --- On Mon, 1/26/09, Stephen W. Kercel <[email protected]> wrote: > From: Stephen W. Kercel <[email protected]> > Subject: [Elecraft] Amplifier Input Impedance > To: > Cc: [email protected] > Date: Monday, January 26, 2009, 9:17 PM > Fellow Elecrafters: > > Is it possible to measure the input impedance of a linear > amplifier by > using an antenna analyzer (such as the Pal Star) at the > input of the > amplifier in place of the rig? > > Would the amplifier input impedance be the same for the > very small > signal that the analyzer generates as it would be for the > 80-100 Watt > drive from the rig? > > Is there any risk of damaging the analyzer (i.e., should I > put a > blocking capacitor between the analyzer and the rig?) by > attempting the > measurement? > > Thanks, > > Steve Kercel > AA4AK > _______________________________________________ > Elecraft mailing list > Post to: [email protected] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
