Topband: Topband Digest, Vol 99, Issue 8
K3vw at aol.com
K3vw at aol.com
Mon Mar 7 14:23:30 PST 2011
Re: Using a BALUN on a "coax to unbalanced antenna", a UN-UN is preferred.
K3VW
In a message dated 3/7/2011 3:01:17 P.M. Eastern Standard Time,
topband-request at contesting.com writes:
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Today's Topics:
1. Re: Preferred Choke Baluns (Tod - ID)
2. Re: Preferred Choke Baluns (Milt -- N5IA)
----------------------------------------------------------------------
Message: 1
Date: Sun, 6 Mar 2011 14:15:18 -0700
From: "Tod - ID" <tod at k0to.us>
Subject: Re: Topband: Preferred Choke Baluns
To: "'Charles Moizeau'" <w2sh at msn.com>, "'Topband'"
<topband at contesting.com>
Message-ID: <41FA0FDD41AD40CBA66A715067CFAC31 at chem>
Content-Type: text/plain; charset="us-ascii"
Charles:
I make 160 meter RF Chokes [Choke Baluns] by running six turns of coax
through 5 cores of Fair Rite type 31 [2.4 in diameter cores]. Five turns
and
six cores will also work.
Tod, K0TO
-----Original Message-----
From: topband-bounces at contesting.com
[mailto:topband-bounces at contesting.com]
On Behalf Of Charles Moizeau
Sent: Friday, March 04, 2011 9:52 AM
To: Topband
Subject: Topband: Preferred Choke Baluns
I'd be grateful to learn the preferences of users of these devices.
My set-up is 50-Ohm, 0.405" diameter (Wireman X-4XL) coaxial cable,
underground, but within electrical pvc conduit. This attaches through a
PL-259 to a DX Engineering radial attachment plate. The antenna is an
inverted L with its base fed just through a variable capacitor (set for my
antenna at ~ 255 pF) .
I have given thought to chopping the PL-259, stringing a bunch of Palomar's
ferrite beads on the coax and then re-attaching the PL-259.
However, an alternative would be to insert a manufactured or home-brewed
balun, toroidal or solenoidal, between the radial attachment plate's SO-239
connector and the variable capacitor.
Physical space is not a problem because I've discovered that the DXE radial
attachment plate will fit nicely into a 12" x 12" x 6" heavy-duty gray
pvc
electrical box ($33 at Lowes). I plan to revise the existing and quite
messy above-ground set-up so that the radials will be inserted into the box
through tight-fitting and caulked notched holes in the four top edges, just
below where its cover will fasten, with their solder lugs attached to the
plate 180 degrees opposite from the conventional configuration. In this
way
the whole business can be buttoned up tightly and buried, with just the
antenna's attachment point and the capacitor's adjustment shaft sticking
up.
Perhaps this plan will be inspirational to others.
I'd prefer to see any choke balun recommendations posted to this list
rather
than sent directly, so as to share the "wealth".
Tnx es 73,
Charles, W2SH
_______________________________________________
UR RST IS ... ... ..9 QSB QSB - hw? BK
------------------------------
Message: 2
Date: Sun, 6 Mar 2011 22:32:09 -0700
From: "Milt -- N5IA" <n5ia at zia-connection.com>
Subject: Re: Topband: Preferred Choke Baluns
To: "Tod - ID" <tod at k0to.us>, "'Charles Moizeau'" <w2sh at msn.com>,
"'Topband'" <topband at contesting.com>
Message-ID: <CE2C51BE70F04EDC862862297B03E554 at MiltVostro2010>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
And I make all of my choke baluns for 160 Meter energy from 30 turns, 6"
in
diameter, of whatever cable it is. This is coaxial leads as well as rotor
cables, etc. Works like a champ.
Milt, N5IA
-----Original Message-----
From: Tod - ID
Sent: Sunday, March 06, 2011 2:15 PM
To: 'Charles Moizeau' ; 'Topband'
Subject: Re: Topband: Preferred Choke Baluns
Charles:
I make 160 meter RF Chokes [Choke Baluns] by running six turns of coax
through 5 cores of Fair Rite type 31 [2.4 in diameter cores]. Five turns
and
six cores will also work.
Tod, K0TO
-----Original Message-----
From: topband-bounces at contesting.com
[mailto:topband-bounces at contesting.com]
On Behalf Of Charles Moizeau
Sent: Friday, March 04, 2011 9:52 AM
To: Topband
Subject: Topband: Preferred Choke Baluns
I'd be grateful to learn the preferences of users of these devices.
My set-up is 50-Ohm, 0.405" diameter (Wireman X-4XL) coaxial cable,
underground, but within electrical pvc conduit. This attaches through a
PL-259 to a DX Engineering radial attachment plate. The antenna is an
inverted L with its base fed just through a variable capacitor (set for my
antenna at ~ 255 pF) .
I have given thought to chopping the PL-259, stringing a bunch of Palomar's
ferrite beads on the coax and then re-attaching the PL-259.
However, an alternative would be to insert a manufactured or home-brewed
balun, toroidal or solenoidal, between the radial attachment plate's SO-239
connector and the variable capacitor.
Physical space is not a problem because I've discovered that the DXE radial
attachment plate will fit nicely into a 12" x 12" x 6" heavy-duty gray
pvc
electrical box ($33 at Lowes). I plan to revise the existing and quite
messy above-ground set-up so that the radials will be inserted into the box
through tight-fitting and caulked notched holes in the four top edges, just
below where its cover will fasten, with their solder lugs attached to the
plate 180 degrees opposite from the conventional configuration. In this
way
the whole business can be buttoned up tightly and buried, with just the
antenna's attachment point and the capacitor's adjustment shaft sticking
up.
Perhaps this plan will be inspirational to others.
I'd prefer to see any choke balun recommendations posted to this list
rather
than sent directly, so as to share the "wealth".
Tnx es 73,
Charles, W2SH
_______________________________________________
UR RST IS ... ... ..9 QSB QSB - hw? BK
_______________________________________________
UR RST IS ... ... ..9 QSB QSB - hw? BK
-----
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------------------------------
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End of Topband Digest, Vol 99, Issue 8
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