W=c/f

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C= 299,792,458 m/s

F=445,000,000 hz

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W=.67369m

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Never trust an online calculator! The one I used (everythingrf) gave me 6.57.

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The can to can connections are typically 1/4w, so .67369 x .25 = .1684

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Since we still play imperialish….. .1684m converted to mm = 168.4? now to inches (div by 25.4) 168.4/25.4 = 6.631” then vf.. x .86 = 5.7” or .82 in your case = 5.44”

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Yep, you didn’t say superflex, so I inferred regular heliax.

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I will point out that if you reverse engineer the original cable lengths, you’ll find that they are not 1/4w. I never determined if they arrived at these lengths by guesstimation, some installation, etc. I was once in a shop where they had a rack of jumpers in ?” increments and they selected cables based on best performance for a given order with a suggested starting point. Swap in a shorter and see if better, swap in a longer, then decide which way to go. You might want to experiment with coax to confirm optimal lengths, then convert to sf if that’s what you want to do.

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FWIW… the cost of connectors for ?” UHF is silly in comparison to 259s on rg142 or 400. You’re only using a couple of feet of superflex. Unless it’s a personal project to “just do it”… it isn’t worth it. I did know a guy that swapped the 239s out for N, but performance wise it didn’t produce a discernible difference.

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I’ve seen a 1504 do in excess of 100db on a 5MHz split. If you don’t get at least 90, you may want to pull it apart and clean the rods, springs, sleeves, and what not. Don’t forget the 239 sockets…. They can oxidize badly in suboptimal environments.

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Matt

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