I am pretty much "old school" on PL-259's. I've been reading with interest
about the new compression 259's. I had pretty much resolved to continue
using the tried and true old solder type PL-259's until I read your
excellent write up on the European units. I was nice and content with
my old 259's, now look what you have done. hi,hi :)
On Jan 21, 2011, at 7:57 AM, Ian White GM3SEK wrote:
> Craig Clark wrote:
>> When Pete brought this up, I went off on a tangent thinking a PL259 had
>> been designed that was similar to the newer F connectors that are
>> called compression connectors. On the F, you strip it per
>> specifications and them compress the back of the connector to complete
>> the job. I was wrong.
>> We refer to the connector as a "clamp" type to differentiate between
>> crimp and the Ham standard solder type PL259.
>> One of the differences I see in looking at the RFI RFU-503 and the
>> European connectors is that on the RFU503 the ferrule that the braid
>> fits over has a beveled edge that mates with the gasket while the
>> European version has a flat edge. I'll leave it to an engineer to tell
>> us what is a better design.
> The RFU-503 is -NOT- the type of connector that I was describing and
> I have tried the RFU-503 type and they are far inferior to 'European'
> design. The anchoring strength of the RFU-503 depends critically on the
> braid being trimmed to the correct length and combed out evenly all
> around the washer. Otherwise the cable will not be clamped tightly all
> around, and will easily tear loose.
> The 'European' design has none of those problems. There is no jacket or
> braid trimming: cable prep is simply one flush cut going all the way
> through the jacket, braid and inner insulation. No special tools, no
> measuring, no fancy surgery at the top of the tower - one cut with a
> sharp knife and the cable is ready.
> The ferrule in the 'European' design is shaped like a top hat, with a
> sleeve and a flange, as shown in this picture:
> The sleeve of the ferrule slides onto the cable, between the braid and
> the inner insulation - no combing required (remember, the braid was cut
> flush with the jacket).
> Then the clamping force comes from compressing a large rubber sleeve (as
> you can see from the picture, this sleeve is much larger than the small
> washer inside the RFU-503). When the back nut is tightened, the jacket
> and braid are squeezed radially inward onto the sleeve part of the
> ferrule, while the flange part of the ferrule is forced into a solid
> 360deg connection with the plug body.
> It's simply a much cleverer design. Accept no substitutes. Salesman does
> not receive commission.
> 73 from Ian GM3SEK
> TowerTalk mailing list
TowerTalk mailing list