Re: KAT100 Power Calibration Problem

Posted by JeremyJones on Mar 01, 2014; 3:40pm
URL: http://elecraft.85.s1.nabble.com/KAT100-Power-Calibration-Problem-tp7584832p7584894.html

Checked my dummy load with an MFJ-259 and it is 50 ohms resistive, no capacitive.  Rechecked all soldering with a lighted magnifying glass and cleaned up a couple of joints.  Rewound T1 just to be sure it wasn't shorted in the windings.

Still the same results of 0.035VDC on pin 3 of U5.

Jeremy
VA3ZTF

Don wrote

Jeremy,

Check the soldering on all the relays, inductors and capacitors - particularly the relays.
If the relays are not well soldered, there can be an inductor or capacitor in the path that will prevent you from getting a good null.
Another thing that will prevent a null is an inductive or capacitive reactance in your dummy load.
You might want to check that with an antenna analyzer to be certain it is a pure resistance.

73,
Don W3FPR