This circuit is a part of a field strength meter circuit in an old magazine, the J1 inductor value is unknown (due to a print error in the magazine).

The circuit work like this: with S1 open and S2A connecting the TR1 base, we take signal from the A2 antenna and trough the DG1 we pass signal to TR1 base only on negative semi cycles. R1 have the function to "load" DG1, I think to bring the diode to the edge of breakdown voltage (more sensitive). I think J1 provide a return path for current that is passed from R1 trough DG1, and the J1 is needed to "return" only DC to the positive power rail blocking the RF.

Considering that this instrument is working on CB band (around 28Mhz), it will make sense that J1 have a value that represent a high impedance around this frequency  ?

If i'm interpreting the circuit in a wrong way please point me to the right direction.

This circuit is a part of a field strength meter circuit in an old magazine, the value of inductor J1 is unknown (due to a print error in the magazine.)

The circuit works like this:

With S1 open and S2A connecting the TR1 base, we take signal from the A2 antenna and through the DG1 we pass signal to TR1 base only on negative semi cycles. R1 has the function to "load" DG1, I think to bring the diode to the edge of breakdown voltage (more sensitive.) I think J1 provides a return path for current that is passed from R1 through DG1, and that J1 is needed to "return" only DC to the positive power rail blocking the RF.

Considering that this instrument works on the CB band (around 28MHz,) would it make sense that J1 has a value that represents a high impedance around this frequency?

If I'm interpreting the circuit in a wrong way please point me to the right direction.