Click for large schematic view

Antenna is 60 foot vertical with base 20 feet above
ground level. Alternate antenna is 60 foot horizontal
wire mounted 23 feet above ground level.

Antenna coil is contrawound 660/46 Litz on 4.5" dia
styrene form. Tank coil is on 6" ferrite rod.

Instead of 8 ohm speaker, I'm using 32 ohm HiFi
headphones, adjusting taps on a 70v line transformer.
Regeneration/selectivity is controlled by positioning hand
wound RF transformer relative to ferrite tank coil.

Reflex ckt is Robert Bazian's design with minor modifications.
Bazian did not intend this design for DX or selectivity,
just loud local reception. Although his latest design
discourages regeneration, I find that encouraging controlled
regeneration and using heterodynes to be more effective
for DX work.

Check out this URL for more info and pictures:

Tom Polk's 2007 Contest Radio

For this year’s 1 active device contest I used the same rig
as the crystal contest just using a switch to select either
the diode or the tube. I used my usual construction
techniques by scrounging whatever I can find.

For a tube I used a 1N5GT battery pentode with 90V of B+ and
using a variable coupling ticker coil. I liked the selectivity
of a double tuned set so I used it for a one tube regenerative
radio. I put the tickler coil between the Tuggle tuned antenna
coil and the detector coil. For the spider web coil forms I used
¾” pvc couplers and round toothpicks.