duplexer

I’m having the issue where my SWR will not stay rock solid. If I get it just perfect, it does. Any other time it’ll start to climb excessively, then hold steady. Or it keeps increasing. The PA cuts power & I’m forced to power off. Equipment is a Motorola MTR 2000 with the hated Notch Reject...

I have a band-reject (notch filter) duplexer with low side at 462 MHz (transmitter) and high side at 467 MHz (receiver). I would like to learn on how to tune a duplexer, so I’ve watched many tutorials on the use of a VNA. What I am having a hard time understanding is why S21 is connected to the...

Please see the attached diagram for a better explanation, and then I ask this question: Is there a Duplexer made with a Low Pass VHF/UHF 108-460 Mhz and a High Pass 700 Mhz+ I can't find one at the typical places; Google, eBay, Antenna Farm, etc. Also, I need to maintain ONE CABLE FEED from...

I want to mount three of these little guys on my car using a triplexer. Anyone have any idea which would be the best one to use to split the signal between the three? I could do two but would rather use three for better coverage. Looking for best recommendations to accomplish my goal. Not...

I bought a new motorola SLR5700 repeater and 'motorola' DSCP10725 mobile duplexer from a large national dealer to replace a Motorola XPR8400 repeater. UHF, IG band. I kept hearing static and had poor reception/range issues with the new system on both analog and DMR. After lots of...

I have a Sinclair Mobile Duplexer in a portable repeater. ( Sinclair Technologies Online Product Catalog - MR254B-2 ) I believe that this is a Band-Pass only duplexer so my question is if I wanted to reverse the TX and RX frequencies do I need to retune the duplexer? Or can I simply swap the...

I am looking for a mobile duplexer to be used in a low powered (5w-25w) portable repeater with about 8MHz frequency separation. Does anyone have any suggestions on mobile duplexers to stay away from or have any recommendations on what mobile duplexers seem to be superior or preferred as to others?

Okay, so I am new at this to a degree and I have a question that I think I might know the answer to, but wasn't sure. Basically, my company uses both VHF and UHF commercial for on location communications. One group uses the VHF band while the other uses UHF band. I, however, now have a dual...

Hi guys, I don't know any tech guy in my area who can clear some things for me and I thought I might ask you about something that's confusing me while doing some duplexer tuning. I'm a "young player" and I can fall into a lot of traps while trying to learn. Please forgive my mistakes if I say...

Good Evening All! I need a little input on a small issue with desense occuring in a VHF repeater system at a site with no other equipment other than a 900mhz SS link radio for telemetry control at a tank site on a 1600'ft hill. Here are the spec's: -Vertex VXR-7000 running at 50-watts out...

I am attempting to program the CDR700. I got it setup to repeat on the same frequency but got a constant tone from the TX radio every time the RX radio received. I changed to a different TX frequency and no more tone. I still want it to re-transmit on the same freq. Somewhere in the middle of...

I am looking into purchasing a Motorola GR1225 16 Channel repeater. My question is if you can only program the internal duplexer for one frequency split, then what can you use the other 16 channels for?

MAKE SURE YOU'VE HAD SOME COFFEE FIRST BEFORE YOU READ THIS ONE! I need some help figuring out how to build some duplexer cans for a portable, 50W repeater...and before you jump your guns, just wait, I'll explain. I control radio comms for a Search and Rescue volunteer group, so we often find...