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In the same boat, I made my own.

I did a little research on the physics of coax and electromagnetic propagation (speed of light) in it, and found that for RG-174 8 inches of cable takes approximately 1ns to propagate. I bought several feet of RG-174 from a local shop, and had a couple of packages of male SMA crimp connectors left over from another project. I painstakingly created the patch cable to as near 8 inches as I could.

While finding a place to store the resulting cable in my component drawers I came across my TinySA antenna and patch cables (2). Low and behold they are about 8 inches long - I had two in hand and didn't know it. I can tell mine from those because mine is something like 1/16" longer. So maybe its worth acquiring a TinySA (tinysa.org)?

My creation is not equal to the precision engineering and construction of the specified Tek equipment, but it's in hand and works well within the limits of my needs. Don't let the loss of fidelity keep you from making progress. In the process you'll learn and will develop a deeper understanding of the requirements of the equipment. Just always keep a healthy understanding of the limits of what you know, and what you're taking on faith.

Dave