I suspect a lot of issues with 259s arise from the variation in
materials. I see lots with nylon and brown 'plastic' (bakelite or
SRBP?) insulation which I wouldn't trust under stress or with age.
Then there's the problem with the braid connection and the cold
soldered joints onto low grade plating. Even when that's ok, the
coupling ring is prone to working loose given time, mechanical
movement or thermal cycling etc. Most other connectors have some
form of spring fingering that maintains contact even when the
coupling nut isn't tight.
Where the non constant impedance isn't an issue, a good quality
well assembled 259 will handle a lot of juice - but it's a trap
waiting for the unwary.
Steve
Carl wrote:
> A 30 Ohm connector that is 1" long will not even show a bump thru at
> least 6M and they are still OK on 2M.
>
> Some UHF articles have stated they are a perfect 50 Ohms at 1296, dont
> know.I use them at low power on 2M FM gear including the 400W PP 4-125A
> FM amp for contest into an old commercial 22' collinear.
>
> Carl
> KM1H
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|