Hi!

Just got an Yaesu FL-7000, and found out that the SWR meter is
behaving in a strange way. The antenna tuner also seems to have some
troubles to tune to an optimum SWR, espcially below 20 metres.

I did like shown in the manual page 13 (added 3 * 50 Ohms dommyload
in parallel and TX freq = 14 MHz), and found out that the SWR meter
is only showing around 1:3 when the TX power is about 100W.
Increasing the power to 200W makes the SWR meter go to max, and
decreasing to 50W it shows about half of what it did at 100W.

I have an external SWR meter attached, and it says 1:3 all the time :-)

I also discovered that the SWR indication is frequency depended. On
80 metres it's impossible to make it show more than about 1:1,5 with
200W TX power.

I did some measurements on the FWD and REF points, and the difference
between them seems to be okay, and my conslusion is that the SWR
bridge is okay. Just to make sure i measures the diodes, and they
seems to be intact.

Studying the schematic tells me that the transistor Q05, and the op-
amp Q01 is involved in calculating the SWR, but I have no service
manual to tell me about values that can be measures, and used to
identify the problem.

Anybody with similar expirence, or just good advices?

Best 73 de OZ1BV, Brian