Jed, Start by using as much cable as necessary to make the connection, then, and only if you have problems should you worry about cabling lengths between the duplexer and radio set. Use quality cable like RG-214 Mil Spec.
BTW: If the length is dependent, there is no simple magical length formula, like 1/4 wave or odd multiples there of. Proper matching depends on the impedance presented by the radio set, duplexer, and to some degree, antenna. If the length is critical, you won't see the right output power at the antenna port of the duplexer. If your duplexer is a Wacom WP-652 four cavity model, the stated loss of the pass frequency is 1.2 dB, which translates to approximately 24% of your applied power will reach the antenna port. So, if you applied 50 watts to the transmitter port of the duplexer, and the duplexer lost the stated amount of 1.2 dB (24%), the power coming out of the duplexer should be about 38 watts. Wacom has a write up on optimizing duplexer interconnecting cable lengths: <http://www.repeater-builder.com/pdf/wp6xxVHFtuninginstructions.pdf> Page 4 of the document under the obvious heading. Jed Barton wrote: >Hey guys. >OK, I'm sure this has been discussed, but I figured I'd ask. >I've got a wacom 220 duplexer and I think the cables between the >transmit side of the cans and the transmitter, and the same with the >receiver need to be replaced. >Any ideas as far as length is concerned? >I know there have been a lot of people saying that length matters, >Any thoughts? >The output frequency is 223.980. >Any thoughts? > >Thanks, >Jed > > > > > > >Yahoo! Groups Links > > > > > > > > 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: http://docs.yahoo.com/info/terms/
