Topband: INVERTED_L_ANTENNA_MATCHING

[Telegrapher9 at aol.com]

George,

I tried an L-network and it will match your antenna on 80 and 160 meters. The 
L is configured as a series inductor at the source end and a shunt capacitor 
at the load end. 

Values to match your antenna:
80 meters: 20 uH and 30 pF
160 meters: 34 uH and 580 pF

The antenna input Z:
80 meters: 92 -j600 ohms
160 meters: 20 +j240 ohms


Component stresses at 1500 watts:

80 meters:
capacitor: 3.4 kV peak, 2.3 amps RMS
inductor: 5.5 amps RMS

160 meters
capacitor: 3kV peak, 14 amps RMS
inductor: 5 amps RMS

So it looks like a rotary inductor good for 5 amps will do it along with a 
capacitor good for 5 kV and 15 amps.

An alternative is to build two fixed component matching networks and switch 
them in with relays. Or, it might be possible to build a non-switched 
compromise network and finish the matching with a tuner at the shack. If you are 
interested in any of these I can look into it. 

   Dave WX7G