[Elecraft] Explain terms for Elecraft DL1 Power Calculation

Chip Stratton chip at strattonfamily.us
Sun Jan 22 15:59:46 EST 2012


OK, thanks everyone for the education. This came up because I wanted to
build an RF detector to use with a multimeter as an RF field strength meter
to compare different ground/counterpoise schemes for HF on a boat.

I ended up copying the circuit for the MFJ-802 field strength meter, which
puts a load of 1 meg across a 1n270 diode bridge. Using a .3 volt drop
assumption for those diodes gives a very linear correlation of voltage
versus transmitted power in the near field. So the .15 volt assumption in
the dummy load calc was a puzzle to me.

AE5KA
Chip


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