Mike, Here is the information from Eric Lemmon WB6FLY that dates back to January 2004 as near as I can tell. The information for the device below is for 2-Meter and there was specs for 440 MHz. Hopefully Eric will join us with the information. I have the 440 MHz matcher, but I don't remember the values of the caps. The UHF has only one turn between the caps. The spacing between the connectors is critical. I put the first unit in a larger box AND IT DID NOT TUNE.
Here is what Eric wrote: 73 JIM KA2AJH Wellsville, NY 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> -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Mike Pugh Sent: Tuesday, January 24, 2006 5:04 PM To: [email protected] Subject: Re: [Repeater-Builder] Z matcher info.pdf I missed it, can you make the plans available, with or without the volt meter mod? Mike Jim Cicirello wrote: > A while back there was an excellent article on making these Z Matchers. > I made two, one VHF, One UHF, they worked well. The only parts were two > Piston Caps, One turn coil between the caps and it was put in an RF > tight box with two RF connectors of your choice. On the home made ones > there was no circuit for the voltmeter. Does anyone know how this > voltage is obtained from the Z Matcher? I would like to incorporate this > design so I can remove the Power Meter and make a final tune. > > > > 73 JIM KA2AJH > > > > ------------------------------------------------------------------------ > > From: [email protected] > [mailto:[EMAIL PROTECTED] On Behalf Of John J. Riddell > Sent: Tuesday, January 24, 2006 11:48 AM > To: [email protected] > Subject: [Repeater-Builder] Z matcher info.pdf > > > > Here is the "How to" sheet on the Z matcher. > > > > John VE3AMZ > > > Z matcher info.pdf > > > > > > > > ------------------------------------------------------------------------ > YAHOO! GROUPS LINKS > > * Visit your group "Repeater-Builder > <http://groups.yahoo.com/group/Repeater-Builder>" on the web. > > * To unsubscribe from this group, send an email to: > [EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]> > > * Your use of Yahoo! Groups is subject to the Yahoo! Terms of > Service <http://docs.yahoo.com/info/terms/>. > > > ------------------------------------------------------------------------ > Yahoo! Groups Links 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/
