Colin, Non inductive resistors are quite inductive above 30 Mhz. The Cantenna is also a poor load at VHF / UHF.
John VE3AMZ ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[email protected]> Sent: Tuesday, September 23, 2008 8:25 PM Subject: Re: [Repeater-Builder] coax length >I am not sure what would make a good or not good load resistor. I am > using a pair of non inductive 100 ohm 100 watt resistors in parallel, > air cooled. I also use a cantenna. Are these not good or fair? > Thanks, Collin > > > -----Original Message----- > From: wd8chl <[EMAIL PROTECTED]> > To: [email protected] > Sent: Wed, 24 Sep 2008 8:26 am > Subject: Re: [Repeater-Builder] coax length > > > > > > > [EMAIL PROTECTED] wrote: >> Dear RP, >> I am doing some testing and have the 145.410 repeater connected to a >> dummy load. To get an accurate output indication in watts is it >> critical to have 1/2 wavelength cables? I have used an 18" cable from >> TX to wattmeter and then a 72" cable from wattmeter to load resistor. > I >> have noticed a big difference in wattmeter indication between using > the >> 72" cable and connecting the load right to the wattmeter. Also the > same >> indication with a cable 144" long. I am making some cables 1/2 >> wavelength long for tuning use. Am I doing right? >> Thanks, Collin >> > > If you have a good dummy load, it WILL NOT matter what length coax you > use. In fact, I try to make sure my cables are NOT resonant. If there's > a significant difference when you go from a resonant cable to a > non-resonant one, or from a 1/4-wave to a 1/2-wave, there is a problem > with the load. > > > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > >
