02-07-2016, 09:32 AM
(02-07-2016, 09:21 AM)pwdrive Wrote: Safety/Lack of isolation?
Lawrence.
Hi.
Very unlikely Lawrence as the telescopic or wire aerial is exposed anyway (these wire aerials have very thin insulation) and of course portables are often battery only.
I have on many occasions fitted a coax socket to portables with greatly differing results with a 3 element beam or dipole. Some work fine but a lot get terrible flooding with stations repeating all over the band. A lot of these sets don't have a tuned front end to cut costs so they flood with strong signals. Sony in particular are bad on this respect. Matching will never be right as they are "matched" (in the loosest possible way) to a random length of wire so a 75 or 300 ohm feeder will not be a match but often it will work OK. Usually the outer of the coax will just be tied to an RF ground.
All I can say is give it a go, you may be lucky or get a lot of flooding, a 10pf cap in series with inner and another on the earthy side to the coax socket if your fitting one certainly wont go amiss.
