Leaderboard

I don't believe you'll have many issues, Personally I use LMR400 right now and I dont have the issues Berkinet has, though my LMR400 is Aluminum on Aluminum, so perhaps this was an old issue the manufacture has since fixed. One thing you'll want to do is make sure any jumpers you use are shielded well from RF wherever the radios live, And you'll want to label each repeater with a callsign just in-case one causes an issue with interference and is hunted back to your place, you can show that both are being operated legally under their own license. Lastly, while you shouldn't need to go super far with separating the antennas It is wise to put about a 10 foot gap from the top of the first antenna to the bottom of the second to avoid signal distortion when both radios are transmitting. I remember having to do that with the FD antennas when they upgraded from 33mHz to 480. lowering one antenna 10 feet below the other stopped the distortion when PD and FD talked at the same time.

You will not have any issues at all, i have commercial pairs way closer then that and combining TX.

I'd go with vertical separation with as much distance between the two antennas as your mast will allow. The higher mounted antenna should be for the repeater you want the greatest range on. And... DO NOT USE LMR-400 From repeater-builder.com

The 1225s are indeed solid serviceable repeaters with built-in controllers. However, they have a seriously bad habit of blowing the final PA amplifier. They work best when run at half their rated power on a 50% duty cycle. However, before you buy a 1225, I would strongly suggest looking at a MTR2000. This is a solid piece of equipment, also with a built-in controller. It has no bells and whistles, just 100% duty cycle ability at the rated power. On a good day you can get a MTR2000 for near the same price as a 1225. Unlike the 1225s, the MTR2000 can be rack mounted. OTOH, it does not come in a neat little metal box like the 1225s. Also note, you will probably have to buy a duplexer. But, a basic mobile unit, like the one included in the 1225s, won't set you back very much.

Was this a surface mount transistor? I didn't think anyone was using those these days...