The meter is designed for 50 to 150 mhz right on the front panel.
On radio AM mode, meter set to 20 watts should see the carrier.
With the key down, SWR set to forward, make the calibrate setting then switch to reflected power.
It should show any reflected power.
If not the meter circuit for reflected power is faulty.
If no reading either way try another cable.
All radios you try with the same cable same result tells me it's the cable.
Good luck.
On radio AM mode, meter set to 20 watts should see the carrier.
With the key down, SWR set to forward, make the calibrate setting then switch to reflected power.
It should show any reflected power.
If not the meter circuit for reflected power is faulty.
If no reading either way try another cable.
All radios you try with the same cable same result tells me it's the cable.
Good luck.