With some help from Bill Lieske of EMR, I now have the information about the EMR #6450/Z VHF Impedance Matcher.
The unit comprises a simple pi network inside a 1" by 1" by 1.25" shielded box, with a male N on one end and a female N on the other. The unit is symmetrical, so it makes no difference how it is connected. A Johanson #5502 piston-type variable capacitor, 1 to 20 pF, is installed right at each connector, with an air-wound coil between them. The coil is #18 bare copper wire, and is three turns having an inside diameter of 3/16", spread out so that there is 1/16" of space between each turn. Although I've never had to do this, the coil can be squeezed or stretched a bit if either or both capacitors run out of adjustment before a match is achieved. The specified capacitors are MIL-SPEC components, being designated as #PC31J200 in MIL-C-14409. The manufacturer's data sheet for this capacitor can be found at: <http://www.johansonmfg.com/avc/5500.htm> 73, Eric Lemmon WB6FLY Yahoo! Groups Links To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
