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
