Re: [Elecraft] KX3 with BL2 Question

On 05/10/17 14:19, John Oppenheimer wrote: The Balun, both 1:1 and 4:1 is modeled with a perfect conventional transformer block "A." The KX3 ATU is modeled with the L-C network block "LC1." A five foot RG-58A/U between the Balun and KX3 is added. A perfect transformer is not a good model for

Re: [Elecraft] KX3 with BL2 Question

Hi Stan: Post ten. There are two ways to approach this, just put something up, or measure and optimize. When using the KX3 ATU, both methods will provide similar results. An 88 foot Doublet and feedline is modeled using EZNEC and SimSmith. The results found here: http://www.kn5l.net/Doublet88/

Re: [Elecraft] KX3 with BL2 Question

As mentioned before, the best option is ladderline attached directly to BL2 on KX3. I am using KX3 with BL1 set to 4:1 using random wires. I also use a direct BNC-banana plug connection. With the direct connection, match is obtained on many some but not all bands, and often only after second

Re: [Elecraft] KX3 with BL2 Question

Thanks for catching the math error. Shows the dangers of multitasking. :) --- 72, Rich Hurd / WC3T / DMR: 3142737 PA Army MARS, Northampton County RACES, EPA-ARRL Public Information Officer for Scouting Latitude: 40.761621 Longitude: -75.288988 (40°45.68' N 75°17.33' W) Grid: *FN20is* On

Re: [Elecraft] KX3 with BL2 Question

You can also tie an underwriters knot at the split point. Actually 67 feet twice makes a 135 foot dipole for 80 meters, not 40. Sent from my iPhone ...nr4c. bill > On Oct 4, 2017, at 10:35 AM, rich hurd WC3T wrote: > > Would not a bnc-to-banana plug adapter hooked to a

Re: [Elecraft] KX3 with BL2 Question

Thank you to everyone for the rapid responses.  Now I know my options.  As a long time feedpoint autocoupler user, this is a new approach for me and it's nice to get advice before cutting wire and cable up. 73, Stan WB2LQF On Wed, Oct 04, 2017 at 09:26 AM, stan levandowski wrote: When

Re: [Elecraft] KX3 with BL2 Question

Thanks for the feedback. --- 72, Rich Hurd / WC3T / DMR: 3142737 PA Army MARS, Northampton County RACES, EPA-ARRL Public Information Officer for Scouting Latitude: 40.761621 Longitude: -75.288988 (40°45.68' N 75°17.33' W) Grid: *FN20is* On Wed, Oct 4, 2017 at 11:50 AM, Don Wilhelm

Re: [Elecraft] KX3 with BL2 Question

Rich, It is a common misconception that the characteristic impedance of the feedline is what you will have to match.  That is only true for resonant antennas.  The feedpoint impedance of a dipole in free space is 72 ohms, but when mounted at practical heights above ground, the feedpoint

Re: [Elecraft] KX3 with BL2 Question

Would not a bnc-to-banana plug adapter hooked to a doublet made from 100' of zip cord be equally useful? Is there even a reason to have a balun in-circuit? I've read the characteristic impedance of the zip cord (or speaker wire, etc.) is about 75 ohms. If you "unzipped" 67 feet or so and put

Re: [Elecraft] KX3 with BL2 Question

Stan, Either of those options will work - however --- I would suggest minimizing the coax. The balun will not transform to a 50 ohm load, so the coax can run at a high SWR which will give more loss than the window line. Whether that minimum is zero or 5 feet will not make a significant

[Elecraft] KX3 with BL2 Question

When operating a KX3 with the internal ATU into a window line fed doublet through a BL2 balun, what is the preferred connection method: 1.  Placing the BL2 right at the KX3 output eliminating any coax.  This puts the window line right next to the metal KX3, everything else on the operating