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: [email protected] [mailto:[email protected]] > 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 > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 10.0.1204 / Virus Database: 1435/3486 - Release Date: 03/06/11 > > _______________________________________________ > UR RST IS ... ... ..9 QSB QSB - hw? BK _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
