You can match 4, 50 Ohm elements using 50 Ohm Cable. Parallel 2 elements with any length of 50 Ohm cable for 25 Ohms. Parallel the other two elements with the SAME any length for a second 25 Ohms. Use a 1/4 wave length of 50 Ohm cable to transform the first 25 Ohm pair to 100 Ohms. Use a second 1/4 Wave section to transform the second 25 Ohm pair to 100 Ohms.
Parallel the 2, 100 Ohm sections and you are back to 50 Ohms. Ssb -----Original Message----- From: Roger Grady [mailto:[EMAIL PROTECTED] Sent: Tuesday, June 15, 2004 12:21 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: DB224 Element Impedance Info Needed Assuming the elements really are 100 ohms, you can match 4 of them using only 50 and 75 ohm coax. Off each element, a 1/2 wave 50 or 75 ohm section will transfer the 100 ohm element impedance to the other end. Each pair is T'd, giving 50 ohms at each T. From there, an odd 1/4 wave 75 ohm section will transform the 50 ohms to 100 ohms. These 2 100 ohm points are T'd, giving 50 ohms for the main feed. The above seems easier than using the hard-to-find 35 ohm coax but there must be other factors I haven't thought of that caused Decibel Products to use it. Roger Grady K9OPO [Steve S. Bosshard] --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.700 / Virus Database: 457 - Release Date: 6/6/2004 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/
