Fieldstrength meter

I replaced an insensitive VU meter by a 100 uA meter on my fieldstrength meter:

This meter uses a quadrupler circuit to increase sensitivity:

The Ge-diodes (OA85) make the meter useable even above 500 MHz.

Later, instead of the OA85's, I installed BAT85 Schottky diodes to increase the sensitivity.

Off topic:

Tholen, 8 Nov 2020