Unless you're measuring at the end of a long line that is swamping a much higher SWR at the antenna, your definition of "an SWR problem" is quite different from mine. I'm thrilled if the SWR at the f
Eric, and group. Amen to Jim's reply about 1.2:1 being quite acceptable, quite good actually, and in no need of extra effort to reduce.... Take a look at the bottom of the page of the LP 1017 data sh
OK, I just took a look at the manual for the BN-86. It appears to be a simple common mode choke. My guess is that it fails because the common mode impedance is not sufficiently high over the range of
I have had a few BN-86's fail with the core breaking. I do not know if that was due to lightning, transmitting on the wrong band or that it just couldn't handle 1500W. Replaced some with BN-2000 HyGa
I have replaced the BN-86 with a 1:1 balun from Radio Works. Worked OK. I think it was rated at 4 KW. Typical SWR curve after replacement. Just used hose clamps to attach it to the boom. You could al
That is what I did for a replacement balun on the 6.2-30Mhz Log Periodic. The MFJ 259 manual shows a neat way to check for any unexpected series (low impedance) resonances in the hand wound coil, wh
Jim, The BN-86 is a standard voltage balun; trifilar winding on a ferrite rod. Common failure mode is due to excessive voltage and arc over at high SWR. If I recall correctly the worst case is using
Interesting. The "instruction manual" describes it as a "current balun." See link below. http://www.hy-gain.com/man/pdf/BN-86.pdf Since you've apparently taken one apart and looked at it, it appears
I have a couple of them around in good shape if anyone needs one....cheap. -Mike Interesting. The "instruction manual" describes it as a "current balun." See link below. http://www.hy-gain.com/man/pd
Yes, I've autopsied a few blown BN-86 baluns in the last 30 years <G>. Notice the "Current Balun" in the upper right is a different type face than the rest of the manual. I think someone is playing
The point I've been trying to drive home is that a TRUE W2DU design is a very good one, and that the multiturn coaxial ferrite chokes I've developed are a major improvement over the W2DU design that
I had a stack of TH7's for many years...BN-86's died and I replaced with the BN-4000. No problems ever with these...Almost indestructible. http://www.hy-gain.com/man/pdf/BN-4000B.pdf 73 Rich N7TR TT
When I've attempted to stress a choke by putting it at a very high voltage point and shove a lot of power to it, it will typically fail by melting the coax. If the heat source (the transmitter power)