That makes me feel significantly better - I don't have the original manual/theory of operation statement so I wasn't quite sure... I do know that the antenna itself was showing 1.5:1 direct, 1.1:1 through the isolator so hopefully it was doing it's job :)
73s, AJ, K6LOR/R On Wed, Feb 4, 2009 at 6:35 AM, Ham-Radio <[email protected]> wrote: > AJ, > > I can not tell you about the Telewave, however I can tell you about the DB > units I have looked at. > > They have a short on all ports, and the DB Engineers that I have spoken to > report this is the design. They are DC Short design just like the folded > dipole antennas. Resonate at frequency of operation.\ > > I hope this helps a little. > > Charles Miller > > > > ------------------------------ > *From:* [email protected] [mailto: > [email protected]] *On Behalf Of *AJ > *Sent:* Tuesday, February 03, 2009 11:49 PM > *To:* [email protected] > *Subject:* [Repeater-Builder] Nominal impedance of a Telewave T-1560 Dual > Isolator??? > > What exactly should the nominal impedance of a VHF Telewave T-1560 Dual > Isolator be? > > The reason I ask... > > I broke out the DMM this evening trying to make some sense of a repeater > issue we've been having... > > Removed each one of the 35 watt dummies off of the load port of the > isolator, one at a time, and verified they sit right at 52 Ohms from pin to > shield (male N-type connector). > > Then I check the load ports on the isolator itself where the 35 watt > dummies were connected - 0 Ohms (direct short) from pin to shield. > > I then checked the in and out ports of the isolator (tx and antenna ports). > These both showed a direct short from pin to shield. > > I also verified that there is a direct short from pin to pin on all 4 > connectors (tx, ant, load 1, load 2), along with shield (chassis/ground) to > shield all around. > > So... My question is... > > Should there be a direct short from center pin to chassis on this isolator? > > > 73s, > AJ, K6LOR/R > 147.080+ > 444.750+ > >
