Bruce Griffiths wrote:
Hal Murray wrote:
My Panasonic VIC100 antenna had a few screws to hold the bottom to the
plastic cone top. The bottom had an o-ring seal that stuck a little
but was still pretty easy to slide the bottom from the top half.
Inside was a patch antenna on top of a pcb.
Thanks. I tried again and it came apart easily. There is an O-ring but no
glue. (I wonder why I didn't get it the first try.)
The antenna isn't a patch. (Or I don't recognize it as such.)
It's a cylinder, 2 inches tall, 3/4 inch in dia, sticking up over a 2 inch
square PCB that's screwed into an aluminum base place.
It's made of flexible PCB material wrapped around to make a cylinder. The
outside bottom 3/4 inch is a plane. There is an obvious solder joint line
closing the plane. The inside top has 4 fingers spiraling around at 45
degrees. The lower inside part (opposite the plane) has some wiggles in some
traces, but I haven't figured out the equivalent circuit.
Thats a quadrifilar helix antenna.
A quite traditional antenna form.
Not sure I have one of those around here.
Cheers,
Magnus
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