John Passaneau wrote:
Highland Ham wrote in
:
There are 2 visual anomalies

I know it is a coil of thick enameled wire with a diameter of approx
25 mm ( 1 inch ) but do not know its inductance .
So in order to make one myself I would appreciate receiving info re
the dimensions incl number of turns ,alternatively the required
inductance.

2)The antenna kit is normally supplied with a specific length of 75
Ohms coaxial cable directly connected across the inductor (see above)

This length of 75 ohms coax is part of the matching system and is to
be connected to any length of 50 Ohms coax running to the transceiver.
In the Pictorial ,page 14 of the manual ,this length of 75 Ohms coax
is identified by 'R'.


TIA for any relevant info


Frank GM0CSZ /KN6WH

(supporting member Radio Invalid and Blind Club, RAIBC, based in the
UK)



Hi Frank:

I can't help with the coil, but the coax is 1/4 wave length at 20m.

I think the coil is around 1.5 inches in diameter, and has around 25
turns or so. It's used to fine tune the swr. In a not very elegant
looking method, you decrease th inductance by pulling the turns apart.
Te better the ground, the worse your coil will look.

It isn't terribly sensitive in the manner that the upper coils are, so
that 1.5 inch/25 turns description will probably get you in the ball park.

I'll check mine (its an HF6V, but should be similar) tonight.

- 73 de Mike KB3EIA -