A blind radio amateur living in my area got the above antenna installed
in his garden complete with an off the ground radial system.
I now try to set-up the system with an MJ 259B analyser ,but I am
getting nowhere ,because of the following :

There are 2 visual anomalies

1) The inductor between antenna and ground post e.g. across the
insulator (labelled 'Q' in the Pictorial ,page 14 of manual) is missing.

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'.

However the actual installation shows 1 length of RG-11 (75 Oms) coax
all the way to the transceiver.
My obvious question : What is the required length of 75 Ohms coax ?


TIA for any relevant info


Frank GM0CSZ /KN6WH

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

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.

73

John W3JXP

Go to the Butternut web site and download the instructions for the
"Counterpoise" which is the radial system for above ground installation. With
that system the base coil is not used and the length of 75 Ohm coax used is
much longer and should be coiled near the feed point, then connected to any
length 50 Ohm coax lead in. I had trouble with the counterpoise system and
finally wound up using several above ground random length (20 feet or longer)
sloping radials. Get the "Counterpoise" instructions off the web!

73

Highland Ham wrote:
A blind radio amateur living in my area got the above antenna installed
in his garden complete with an off the ground radial system.
I now try to set-up the system with an MJ 259B analyser ,but I am
getting nowhere ,because of the following :

There are 2 visual anomalies

1) The inductor between antenna and ground post e.g. across the
insulator (labelled 'Q' in the Pictorial ,page 14 of manual) is missing.

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'.

However the actual installation shows 1 length of RG-11 (75 Oms) coax
all the way to the transceiver.
My obvious question : What is the required length of 75 Ohms coax ?


TIA for any relevant info


Frank GM0CSZ /KN6WH

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


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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 -

Michael Coslo wrote:
John Passaneau wrote:
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.
===========================
Tnx John ,Unknown and Mike for your response. I'll have a look at the
Butternut site and make a base coil.
Many moons ago I witnessed vastly improved performance of a Butternut
HF6V ,which had the base inductor and initially only 1 ground spike.
The antenna was situated in the middle of a lawn.
After covering the area around the antenna with chicken wire mesh
performance improved by 1 to 2 S-points Within 3 weeks the wire mesh
was no longer visible and the grass could be cut by moving a mower over
the wire mesh .
But with the HF9V I first try to set it up by the book (later in august
when I'll be back from a trip)

Tnx agn all

Frank GM0CSZ / KN6WH

PS : In the meantime I'll keep monitoring this NG for any additional
relevant info.

Highland Ham wrote:
Michael Coslo wrote:
John Passaneau wrote:
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.
===========================
Tnx John ,Unknown and Mike for your response. I'll have a look at the
Butternut site and make a base coil.
Many moons ago I witnessed vastly improved performance of a Butternut
HF6V ,which had the base inductor and initially only 1 ground spike.
The antenna was situated in the middle of a lawn.
After covering the area around the antenna with chicken wire mesh
performance improved by 1 to 2 S-points Within 3 weeks the wire mesh
was no longer visible and the grass could be cut by moving a mower over
the wire mesh .
But with the HF9V I first try to set it up by the book (later in august
when I'll be back from a trip)

Tnx agn all

Frank GM0CSZ / KN6WH

PS : In the meantime I'll keep monitoring this NG for any additional
relevant info.
======================================
Butternut manufacturer ' Bencher' has now provided the following info :
QUOTE
Coil Q Base Matching - can be made out of 17 turns of 12 awg magnet wire
wound on a 1 1/4 inch (31.8 mm) form.

Coax 75 Ohm Matching Line - made from RG-11 75 ohm coax, 11 ft 4 inches
(345.4 cm) if solid dielectric, 13 ft 6 in (411.5 cm) if foam type.
UNQUOTE

I am happy with the above . This item can be closed.

Frank GM0CSZ / KN6WH

This is a direct quote resultant from a phone call to Bencher.
"The 75 Ohm Matching Line for 20 meter operation (P/N 290-08)
should be from RG-11 75 ohm coax, 11 ft. 4 in. (345.4 cm) if
solid dielectric, 13 ft. 5 in. (411.5 cm) if foam type."

KB4RDV


On Wed, 11 Jul 2007 23:08:16 +0100, Highland Ham
wrote:

A blind radio amateur living in my area got the above antenna installed
in his garden complete with an off the ground radial system.
I now try to set-up the system with an MJ 259B analyser ,but I am
getting nowhere ,because of the following :

There are 2 visual anomalies

1) The inductor between antenna and ground post e.g. across the
insulator (labelled 'Q' in the Pictorial ,page 14 of manual) is missing.

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'.

However the actual installation shows 1 length of RG-11 (75 Oms) coax
all the way to the transceiver.
My obvious question : What is the required length of 75 Ohms coax ?


TIA for any relevant info


Frank GM0CSZ /KN6WH

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

This is a direct quote resultant from a phone call to Bencher.
"The 75 Ohm Matching Line for 20 meter operation (P/N 290-08)
should be from RG-11 75 ohm coax, 11 ft. 4 in. (345.4 cm) if
solid dielectric, 13 ft. 5 in. (411.5 cm) if foam type."

KB4RDV
================================
Tnx for info , it is much appreciated

Frank GM0CSZ / KN6WH