Hi Like any design, the first question is - what's the goal?
If you have enough RF running around, then shielding is well worth looking at. How much of the cable is in "variable temperature" space? If it's all indoors / heated living space, even tempo may not be a big deal. All that said, I'd probably look at twinax. After you do all the get it in and get it out stuff, a balanced line often works best. It's a matter of baluns / transformers / amps and the coax structure. In a sense, a normal piece of coax is inherantly imbalanced (noise hits the shield). If it's a single run, the connectors aren't going to be enough money to make it crazy. Bob On Apr 22, 2013, at 11:18 PM, Kevin Rosenberg <ke...@rosenberg.net> wrote: > On Apr 22, 2013, at 7:13 PM, Bob Camp <li...@rtty.us> wrote: >> Ummmm, errrr. Even with all the mods, a 4501 is a fairly low resolution >> device. It's an amazing little box and I have several of them. Some (but not >> all) with the mods actually done correctly. > > Ummm, apologies for the errant posting that should have been a private > message to N8UR. > The 4501 was directed about a previous post to John. > > The question for John about his new distribution amplifier was so that I > could place my > RF and thermally-shielded 10811-60109 in the corner of my concrete basement. > Then, > run 100 ft of galvanically-isolated coax to my lab. > > Now that's its public, do you have suggestions for the coax? I was thinking > about LMR-240 > for its double-shielding and low tempco at 10 MHz. > > Thanks, > > Kevin > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.