***** I also have mine wired for COR. I'll have to experiment with that sometime.

Just saw the video and my expectations were exactly the same.. waiting to the transmitter to be brought back online just the same waynit was disabled..

+Jeremy Cook the controller and the duplexer are two different issues. The duplexer let's you go to a single feedline and antenna for your specific frequencies. A controller is required regardless of your antenna system if your repeater is for a service that requires automatic ID and control.

a decent duplexer shouldn't have much loss... running more power doesn't cause you to lose less RF.. Typical duplexers have between 1 and 1.5 db loss... so 20 watts input with 1.25 db loss in the duplexer will give you about 15-watts out of the duplexer... the same loss factor would give you 3.75 watts output with 5 watts on the input. Now I know you've mentioned you need more power.. however have you thought about your receive at all? Having a louder transmitter doesn't help your repeater hear better. I know quite a few repeaters that put out a lot of power, and they out talk their receive radius by a fair margin. Most of my repeaters that I have online run preamps so not only can they be heard, but they hear very well... and thus have a balanced system... If you can hear my repeater, it can hear you. I would not recommend running a preamp on a simple notch duplexer that the online in this video.. you would need a band pass/reject duplexer so you don't end up with desense, plus you don't want to overload your preamp with possible intermod or other unwanted signals.

It should work. The hard part will probably be everything except the RICK

Hi D M. I'm looking at doing the same thing as yourself using two GM340's (or 360's if necessary) and a RICK linked to my node. Did you get it to work ok?

Kenneth Finnegan I have bee testing pins for several days and in the schematics and drawings it shows which ones are external mic input and audio out but I don't think it is a fixed out. If you know anyone that has attempted any kenwood mods and can link me up with would be great. I would really like to get working properly I've seen one on ebay that was already put together but was sold so I thought I could build one don't know if there is some programming that has to be done I was able to change settings to get cor from pins tried injecting audio source on mic input but getting nothing built a rj45 jack with 3.5 mm headphone jack to get audio from one radio to other but I won't be happy with that really want internal pins to do all the work and be able to use the hand held mic too so it can act as home base station too. Thank you for any help.

You need to move a jumper inside the TK880 to allow it to use the aux input from the accessory cable and not the mic from the front panel. If you’re still in need, message me back and I’ll check my notes and see which one it was. I built a repeater with three TK880s and it works great. One is the control radio on a different frequency so i can take down or change channels without interference. I’m also using an Elektra 2000 repeater controller. It’s also in the service manual for the TK880.

It wouldn't take a whole video. They have poor isolation and terrible insertion loss (3dB).

Kenneth Finnegan I concur. After lots of research, I wouldn't consider anything less than a Sinclair duplexer. Sure I could build one, but it wouldn't be as good and would take me a month with two new babies in the house.

wow 80 watt gmrs, you guys dont go by laws ?

Not often I like 100 watts which really don't interfere with anything way out in there rural country as me and the terrain kinda calls for the extra kick same with vhf stations most ham repeater are even 150+ watts or close

Wished I could maintain a good solid net with only 25 watts cuz the heat is not that bad to control like 50+ watt stations are

4 db? That's a lot of loss for a duplexer

this repeater will be serving a LARGE convention center for portable radios to communicate effectively im open to any suggestions

the complex is about 3 billion square feet

what if we were to use one repeater for each buildings, there is 4 buildings

i own a security company

what kind of range would a 45W repeater cover

I was wondering that. What I noticed was the Call Alert displayed on the RX stays illuminated but I can't figure out if this needs a confirmation button press to clear on the radio front panel or if another Call Alert will still come through remotely. I was hoping that you could remotely toggle the Txer on and off remotely but it wasn't really that clear. Hopefully we will find out soon.