Stuart K5KVH wrote: An external 4:1 balun is typically less lossy than the built in 4:1 baluns. Better still, use the W5YR idea, a bead ferrite choke on the coax output, then connect there with a coax to binding post adapter for balanced line, and you eliminate questions about your balun.
------------------------ Beads are great if you're using coax, mostly because they are low-loss and don't change the impedance presented to the tuner. Sometimes a 4:1 balun is the worst choice. It reduces the impedance the tuner 'sees' for a load. If it's being used as it was intended - in a fairly-well matched load such as 300 ohm line to a folded dipole cut to length - it's FB. In that case it'll translate the 300 ohms to 75 ohms, and easy match for the tuner. But, if the 4:1 balun is looking into an antenna or feed line with a high SWR the impedance it's driving might be very low, perhaps only a few ohms. If the 4:1 balun can handle it at all, it'll divide that impedance by four again, making it a very tough match for most tuners. Ron AC7AC _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
