http://www.hamtronics.com/pdf/wp-652%20duplexer.pdf
Haven't tried this one. Suggest disconnect cables from T connector and rotate coupling loop for abt 8 dB dip. Orientation will change depth of dip. Setting coupling like this makes symetry in all cavities. Then tune plunger for pass. Go back and forth a couple of tiimes. Else try and get ahold of John Elliot in Waco. ssb ----- Original Message ----- From: "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> To: <[email protected]>; <[EMAIL PROTECTED]> Sent: Wednesday, November 05, 2003 9:54 PM Subject: [Repeater-Builder] 220 Duplexer Tuning Help | I'm trying to tune the high side of a TXRX WP-652A duplexer. This is the | duplexer where the couplings adjustment is loosening 3 screw on the duplexer | connector and turning the assemble to adjust the reject frequency. I'm | using this on the 220 ham band, 224.84 TX, 223.24 RX. | | My starting point was to adjust the rods and coupling for maximum TX out of | the duplexer, then back off on the couplings for maximum reject at my RX | frequency. The RX notch is actually below my noise floor on the spectrum | analyzer, so I'm adjusting it so the center of where the notch would be is | on my RX frequency. | | In other words it's maximized for my TX frequency and minimized for my RX | frequency. | | When I hook up the transmitter, and put 25 watts into the duplexer, I'm | getting 10 watts out (per Bird 43). According to the duplexer spec I should | only be losing 1.2dB. | | Something tells me I have the coupling set too tight, but how far should I | widen it? | | | | | | | | | Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ | | --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.535 / Virus Database: 330 - Release Date: 11/1/2003 Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
