project was found on Talino's site, IZ7ATH
and works very very well up to about 35Mhz. It starts to fall off over
40 Mhz and dies by about 50 Mhz. Winding the coils was a lot of fun.
Since building it, QST Magazine, May 2003 pp 54 also has a
similar project worth looking at. You can jump to Talino's site with
this link ...IZ7ATH
The circuit diagram
40673 sub: BF960
The top view:
Note BNC output at top
for coil attachment.
NO FREQUENCY DIAL!!!
It is assumed that you have a frequency counter to read directly off
the BNC on the front panel (beside the mode switches) for a very
I never liked the crude dials on most homebrew dippers.
Dipper and matching coils
The coils were made with
26g enamel wire, on simple
1/2 inch cpvc tubing.
The BNC connectors on the coils were epoxied in place.
Packing Tape was wound on the completed coils to keep the wire
Labels made with a
Brother P touch
PCB: H=58mm L=80mm
The pcb was
done with the
felt marker / ferric chloride
technique, using letterset
style donuts for the copper pads.
Holes then drilled with the Dremel.
These values are a starting point.
Wrap turns and and test as you go...
you Talino !