Re: [Repeater-Builder] Help with Wacom WP-639 Duplexer

[Kevin Custer]

Rob Martin wrote: All   Today I have spent a couple of hours sweeping the cavities and come to the conclusion that they are all high pass low reject. (Originally of tx152 & rx158) Looking at the cavities  25mhz either side of my desired frequency RX145.1625Mhz TX 145.7625Mhz I can a second notch but this never comes within 2Mhz of the pass with the invar rod all the way in. They tune perfectly for pass high notch low.   So it looks like I have a set of useless cavities unless anyone knows what the physical difference is between the High Pass Low Reject and High Reject Low Pass. Can I make any modifications? The duplexer was likely set up as a "wide spaced' unit since you have passed the original frequencies along. The notch spacing from the pass is determined by the length of the center conductor in the notch stubs.  These center conductors will likely need made longer to get the spacing closer.  This center conductor is usually simply a length of brass rod soldered into the connector.  Also, depending on the depth of the line boring in the dielectric rod, it too (the depth of the bore) might need to be deepened, but try the rod lengthening first. Let us know how you make out. Kevin 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 the Yahoo! Terms of Service.