I had a few yellow raspberries planted 10 feet away from my tomatoes. I moved them the next year so I didnt leave them there. They were fine. The tomatoes/potatoes thing leaves your raspberries susceptible to a certain disease and I dont remember off hand which one it was.

I have a 30' row of raspberries behind my 28' tomato row. The path between is 4' from pole to pole. Raspberries fill in with more plants every year to reduce that distance 2', so there is a narrow path between them during the height of summer. It's my only full sun large space.

I don't know if there is a recommended safe distance. It's convenient because both need summer water & I have my soakers start at the raspberries then down around the corner across the path and back up the tomato row.

As long as I remove old foliage from both crops and do not compost them I don't expect to have diseases. Should be workable.

Thanks so much for the help,
I think I can make this work.

The University of Georgia Extension recommends waiting at least five years to plant blackberries in ground where tomatoes, potatoes, peppers or eggplant have grown, as these "solanaceous crops" all carry verticillium wilt.

I think recommendations against are based on research in commercial settings and may have no bearing on planting in home garden settings. This is a frequent problem with advice coming from landgrant universities that get repeated and repeated after their transfer from commercial production recommendations to home gardener recommendations.

Even if you lost your raspberries it would be a relatively small investment. I've grown tomatoes adjacent to brambles for 25 years in the northeast and never had a problem- for what it's worth.