David, My understanding is the cables between cans is 1/4 wavelength electrically.
For RG214 which has a velocity factor of 0.66 at 147 the cables would be about 13.25 inches. Now the type of connectors can influence this in that the connector type might lengthen the cable. N-connectors protude beyond the cable where PL259s do not. The equation is (2951 (inch) / F (MHz)) x vel factor of cable (results is in inches). Might get more info from other on the board. I looked thru the DB probucts cat and they give no info on duplexer cabling. Give about every thing else. If you can get one of these catalogs it has some good info on antennas and duplexers in the back. Today with the internet few have data books or catalogs except on the internet. Instant results instead of waiting weeks sometimes. I have found making the cables between tx and rx can improve slightly duplexer performance, maybe 5 db, but many say it does not matter. Getting this length can be difficult because often inside the repeater tx and rx is cable also. 73, ron, n9ee/r >From: David <[EMAIL PROTECTED]> >Date: 2008/07/21 Mon PM 12:46:01 EDT >To: [email protected] >Subject: [Repeater-Builder] Duplexer cables > >After searching the site I have not been able to figure the cable >lenghts I need. Does anyone have the lenghts to bring a Decibel >Model # DB4060 duplexer down to 147Mhz? > >David Epley, N9CZV >[EMAIL PROTECTED] >Winchester, Indiana > > > Ron Wright, N9EE 727-376-6575 MICRO COMPUTER CONCEPTS Owner 146.64 repeater Tampa Bay, FL No tone, all are welcome.
