Motorola/Celwave Duplexer

[jonvenusti]

Hello,

I was looking at Celwave/Motorola duplexers, the unit that is typically sold with a Quantar from Motorola. Its a 6 cavity band pass/band reject unit. The duplexer is currently tuned to 462.000 +/- #MHZ offset. My question is, when the unit is retuned to the ham band, do the cables between the notches need to be replaced? The model of this unit is from the 440-470 range. Do those cables cover that whole range or are they cut to the specific frequencies ? Thanks !

 

[Citywide173]

The duplexer will need to be retuned. It should not require a replacement of any of the parts though.

 

[jim202]

Hello,

I was looking at Celwave/Motorola duplexers, the unit that is typically sold with a Quantar from Motorola. Its a 6 cavity band pass/band reject unit. The duplexer is currently tuned to 462.000 +/- #MHZ offset. My question is, when the unit is retuned to the ham band, do the cables between the notches need to be replaced? The model of this unit is from the 440-470 range. Do those cables cover that whole range or are they cut to the specific frequencies ? Thanks !

Over the years I have found that most companies have a table of the jumper lengths based on the segment that the duplexer will be used in. You will find some people that tell you the jumpers don't need changing.

If your not looking to meet the specs, then you could use the same jumpers moving it from the 462 to 440 segment. If your looking to obtain the rated isolation and injection loss, then the jumpers will need to be changed.