What exactly are you trying to do with your setup?
Hawk,
The multi-coupler link you provided is what you need. It is commonly referred to as a duplexer, there are two types, bandpass (passes only the tuned frequency) and band notch (does not pass the tuned frequency).
That will allow multiple radios on one antenna, the cavity filters stop the RF from one radio going into the other radios.
And if I where to try and do it using the splitter device instead of the multicoupler would you expect to work at all? would I risk damaging the repeaters?
It is not so problematic. Description is here: Radioklub OK1OMX
Unfortunately it is only in Czech language. (Try google translator ) To complete the picture: KZ circulator is made of coaxial cable, called a "rat racing". Used it as a World War II. The biggest problem are the IM3 products. I solve it by using circulators and it works without problems even at 25 kHz spacing. IM3 is better than-90dB.
73 Milan OK1MX
Hawk,
Radios have their own built in signal isolation, it is not much but it usually is enough to have two radios using different antennas and tuned to similar frequencies to ignore eachother. But since you want to tune your radios to similar frequencies but use the same antenna, that built in ability to ignore the other radios probably won't be enough.
The RF power splitter is probably for a different application than you are trying to do.
Can you provide these specs on the radios you are using
Receive frequency radio 1
Transmit freq radio 1
Transmit power radio 1
Sensitivity and selectivity radio 1
Receive freq radio 2
Transmit freq radio 2
Transmit power radio 2
Sensitivity and selectivity radio 2
ICOM 208H Specifications
I have a cool spreadsheet I'll look for that we can use to find out the amount of isolation needed too.