Chuck, I'll meet you halfway. I found a UHF Z-Matcher that I didn't know I had, and opened it up. It's an EMR #6550/Z.
The UHF unit is physically identical to the VHF unit, with the following exceptions: The two variable capacitors are Johanson #5402, rated at 1 to 14 pF, and the air wound coil is one turn with the same diameter and spacing. I do not have a low-band VHF unit to examine, but given the trend, I would suggest starting with two Johanson #5602 capacitors 1 to 30 pF and a coil with six turns. A little experimentation wouldn't hurt... 73, Eric Lemmon WB6FLY Chuck Kelsey wrote: > > Not wanting to sound like "looking a gift horse in the mouth" what about 6 > meters and 440? > > The GE versions for 2 and 440 look good, but I also like the idea of a self > contained version that just adds on at the antenna port. > > Chuck > WB2EDV > > ----- Original Message ----- > From: "Eric Lemmon" <[EMAIL PROTECTED]> > To: <Repeater-Builder@yahoogroups.com> > Sent: Sunday, January 25, 2004 8:00 PM > Subject: [Repeater-Builder] Z-Matcher Component Values > > > 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/ 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/
