I am not sure I know how to do this. I have a device that I made <http://www.qsl.net/k2vco/sniffer/rfsniffer.html> to measure current but it gave me anomalous results when I tried it on the matchbox. I found that when I measured the currents about 4 inches from the matchbox they were equal, but when I measured them two feet away they were significantly different. So there is something I don't understand about this process.
On 4/6/2012 9:16 AM, Geoffrey Mackenzie-Kennedy wrote: > Vic, > > Before you write off "truly balanced tuners" in favour of the T-network + > balun <g>, it > would be interesting to measure and compare the current in each wire of the > feeder (while > transmitting a carrier) when using the Matchbox and then the T-network + > balun? > > 73, > Geoff > LX2AO > > > On April 05, 2012 18:28 +0200, Vic K2VCO wrote: > > > <snip> > >> But here is the surprising part: I expected that the Matchbox would provide >> better >> balance, which would reduce radiation and pickup from the feedline. To test >> this, I >> coupled a grid-dip oscillator to the feedline about 20 feet from the tuner. >> >> To my great surprise, the signal from the oscillator was much weaker with >> the T-network + >> balun than with the Matchbox! >> >> Signals the same, 'noise' weaker. So much for the need for 'truly balanced' >> tuners! > -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
