"Jim Shorney" <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- That doesn't sound quite right, but the MFJ instructions seem a little wierd.
On Sun, 11 Dec 2005 09:31:29 -0700, Peter Hoon wrote: >Connect one end of your coax sample to the MFJ 249 or similar unit. Connect >the other end with let us say 27 feet of coax to a fifty ohm resistor, >between ctr and shield. You can coil up the coax on the floor. You won't get ANY dip with the 50 ohm resistor at the end of the line. That would be a flat line. MFJ wants you to connect an open line to the analyser with a 50 ohm (Non-inductive) resistor in series with the center conductor at the antenna connector. Not sure why, I cut a 144.39 stub filter for my television line by just connecting an open line directly to the analyser; I didn't see any benefit to using the resistor. >Measure precisely the length of your contaminated coax sample. > >Find the dip frequency using the 249 analyzer. For example, a 27 foot >length has a dip frequency of about 7.3 Mhz. Start at the LOW end of the range and find the first dip. The line will dip at 1/4 wavelength and multiples thereof. -- Jim Shorney -->.<--Put complaints in this box jshorney (at) inebraska.com Ham Radio NU0C Lincoln, NE, USA EN10ps http://incolor.inetnebr.com/jshorney/ ---------------------------------------------------------------------- Submissions: [email protected] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net ----------------------------------------------------------------------
