Discussion in 'Radio Circuits, Repair & Performance' started by CO8HF, Jan 20, 2021.
Direct antenna without internal ATU on, it is seen that it does not indicate output power either
And here is what the external SWR meter indicates, as seen, it says that the SWR goes down. The antenna is homemade ZS6BKW
Look at the external SWR meter
for starters, check the two diodes D1 and D2 on the CTRL board. They supply the swr voltage to the tuner and the meter.
What happens when you depress the PO Meter button, the second from the top?
The internal SWR meter does appear to read differently than the external meter. It looks like the internal reads 3:1 when the tuner is off, while the external reads 1.5:1.
Exactly, the internal meter reads differently from the external meter, different readings, for the same antenna, and we do not see any indication of power output on the internal meter and it can be seen on the external meter
The SWR bridge contains two diodes, one to detect forward power and one to detect reflected power. I suspect the forward diode has failed which has eliminated the forward power measurement for both the power output meter and the SWR comparison. SWR is based on a ratio of forward to reflected power so with no forward power measurement the ratio of reflected to forward is erred.
Greetings, the transceiver has started to work, for days the meter works correctly indicating the parameters well, what happened? I don't know. Maybe a greemly, HiHi Thanks for the advice you have given me