[R-390] Input impedance of R390A

[Roy Morgan]

At 09:52 PM 9/3/2002 -0400, you wrote:
>Has anyone actually measured the input impedance at the balanced feedline
>connector of the R390A?

Yes. Dallas Lankford (I think) told me not long ago that he had done such 
measurements.  The values varied from band to band and across each 
band.  The numbers were roughly from 80 ohms to 350 ohms.  I don't remember 
if he did reactance measurements (R + jX) or not.

My suspicion (not having done it  ... yet) is that the input impedance will 
vary according the the way the input circuit is tuned and according to the 
mechanical alignment.  So a set of measurements would not hold after you 
did an alignment on the front end.

Roy


Roy

Roy Morgan
K1LKY since 1959
7130 Panorama Drive, Derwood MD 20855
301-330-8828 home .... 301-975-3254 work
roy.morgan@nist.gov