Dale,
Actually, I was thinking that the controller is a PC or laptop. It would
control the station transciever as a swept low-power frequency source, and
get the phase and gain readings from the PIC that would be paired with the
Analog Devices part (and of course a directional coupler of some sort...even
a simple bridge would suffice). This design could result in a very simple,
low-cost, and powerful vector network analyzer for the average ham.

Joe
W3JDR


"Dale Parfitt" wrote in message
...


W3JDR wrote:

Has anyone here built a GOOD antenna/network analyzer?

From what I can determine, the MFJ stuff doesn't resolve the sign of
reactances, nor does it have a computer interface. I was looking at
Analog
Devices' AD8302 IC (http://www.analog.com) for this application. This is
a
single-chip device that measures the gain and phase difference between 2
RF
inputs up to 2.7 GHZ with very high accuracy. It occurred to me that
this
chip, together with a PIC that has A-D conversion, and a
computer-controlled
station transceiver, could form the basis for a very nice programmable
antenna/network analyzer that would run rings around the MFJ units.

Comments?

Joe
W3JDR

Hi Joe,
Look at:
http://www.njqrp.org/antanal/
Perhaps your IC could be combined with this controller.

Dale W4OP