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Two Tube Doerle

This radio uses two #30 tubes and operates on batteries. It has shortwave coverage in two bands, 4.8 to 7.5 MHz and 7.3 to 12.0 MHz using plug in coils
post 04 Nov 2020

Antenna Shortwave Links


Echelon-Log Beverages, W8JI
Two Beverages are paralleled a short distance apart, and stepped one in front of the other, can be phased to remove unwanted rearward response

Experimental Short-wave, KC4IWT
These circuits perform very well. However, I'm still experimenting

Ferrite coupler, KC7NOD
This is a useful device for coupling an external antenna to a radio that has no antenna jack

Flag Pennant Ewe, K9AY
These antennas work best when propagation time of signals along the horizontal wires matches propagation time of the wave in space around the antenna, and when the earth or a ground system below the antenna is good

Harmonically Related Antenna Broadcast Bands
These two pages describe the assembly and parts measurement of a 1/4 wavelength, end fed receivin