I recently purchased a used Vertex Standard VXR-7000U repeater and a Fumei Duplexer factory tuned to 462.000/467.000. The repeater is using 462.550 for community communications utilizing a Dr. Fong DBJ-UHF commercial antenna with 5db gain and custom tuned to 465MHz mounted 20 feet off the ground with 80 feet of Rg8x cabling. On my initial install of the repeater and duplexer, the SWR was 1.06 but wattage dropped from 52 to 33 using the duplexer.
I started to notice the repeater signal showing a lot of static and quality lower than simplex TX with my hand-held radio. I rechecked the SWR this morning to find it now at 2.4 through the duplexer.
My question to more experienced operators: Is it normal to loose 20 watts of power when using a duplexer? What would make the SWR change during 2 months of use?
I have removed the duplexer and currently using 2 antennas, the TX being a Dr. Fong UHF/VHF DBJ-1 mounted on the opposite roof line of my house from the RX antenna.
Any incites on how to address the quality issues would be greatly appreciated.
PS....I do not have the equipment to re-tune the duplexer to improve SWR.
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mpoole
I recently purchased a used Vertex Standard VXR-7000U repeater and a Fumei Duplexer factory tuned to 462.000/467.000. The repeater is using 462.550 for community communications utilizing a Dr. Fong DBJ-UHF commercial antenna with 5db gain and custom tuned to 465MHz mounted 20 feet off the ground with 80 feet of Rg8x cabling. On my initial install of the repeater and duplexer, the SWR was 1.06 but wattage dropped from 52 to 33 using the duplexer.
I started to notice the repeater signal showing a lot of static and quality lower than simplex TX with my hand-held radio. I rechecked the SWR this morning to find it now at 2.4 through the duplexer.
My question to more experienced operators: Is it normal to loose 20 watts of power when using a duplexer? What would make the SWR change during 2 months of use?
I have removed the duplexer and currently using 2 antennas, the TX being a Dr. Fong UHF/VHF DBJ-1 mounted on the opposite roof line of my house from the RX antenna.
Any incites on how to address the quality issues would be greatly appreciated.
PS....I do not have the equipment to re-tune the duplexer to improve SWR.
Mike
WRJE502
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