Topband: Preferred Choke Baluns

[Robert Harmon]

Charles,
I also use the same choke construction as Tod, K0TO.
Six turns through 5 Fair Rite No. 31, 2.4" dia ferrite cores.
Works very well, essentially zero loss and no heating issues.
Note, put the Pl-259 on after you make the choke coil or you 
will be able to only get about 4 turns !

73,
Bob
K6UJ

On Mar 6, 2011, at 9:32 PM, Milt -- N5IA wrote:

> 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
> 
> _______________________________________________
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