Bernie, A typical VSWR for a duplexer would be 1.5:1 or less, more like less. Will not be 1:1 most times, but low. A lot lower than your 65/25W which is more like a 4.5:1 VSWR.
Really sounds as the duplexer is out of tune or has an internal problem. Wonder if you tuned these from another band such as 150-160 down to 144-148. Did you keep the upper freq on the same side and the lower on the new lower??? Often one should keep the same even if the upper/lower is say tx/rx and the new is upper/lower rx/tx. Not always, but have seen a problem if one tries to reverse the cavity sides, make upper side the lower freq just because one says tx and the other rx and try to keep on same side, but reverse the upper/lower. This is getting confusing, hi. 73, ron, n9ee/r >From: dallasreact112 <[EMAIL PROTECTED]> >Date: 2007/08/24 Fri PM 07:16:22 CDT >To: Repeater-Builder@yahoogroups.com >Subject: [Repeater-Builder] Duplexers > >Anyone one know what to expect SWR wise with a duplexer? >I have a DB products 2 meter duplexer on an amateur repeater. >Measuring with a Bird wattmeter between the duplexer and antenna I >read 50W forward and a couple watts reverse. That is ok. But when I >check between the transmitter and the TX port on the duplexer I get a >about 60 W forward and 25W reverse power. Is there a rule fo thumb for >a known good SWR value thru a duplexer? Should a good duplexer introduce >any significant SWR? > >Thanks > >Bernie Parker > >K5BP > > Ron Wright, N9EE 727-376-6575 MICRO COMPUTER CONCEPTS Owner 146.64 repeater Tampa Bay, FL No tone, all are welcome.
