[amsat-bb] Re: Where can I buy pre-made feedline?
kl7uw at acsalaska.net
Tue Dec 4 23:29:38 PST 2007
At 08:59 PM 12/4/2007, STeve Andre' wrote:
>On Wednesday 05 December 2007 00:53:08 Rick Mann wrote:
> > On Dec 4, 2007, at 9:42 PM, kc6uqh wrote:
> > > Before you give up I suggest you buy the silver plated PL-259' s If
> > > you can't find them, then with a pocket knife or small file remove
> > > the nickel plating, use a good grade of rosin flux 37% Pb 63%Sn
> > > solder. THe aluminum will not solder but the braid is tin plated
> > > copper. You need a 250 Watt soldering gun or 100Watt iron Heat the
> > > first hole add solder then the second etc after the third hole you
> > > will notice the connector is hot enough for the solder to wick into
> > > the holes.
> > Thanks, but I've already spent a small fortune in additional tools to
> > do this. I'm done. I just want to buy well-made cables.
>Well, I can't think of a better place than the RF Connection, in
>Maryland. Ask for Joel, and during the conversation mention "crabs".
>He'll be very puzzled that you said that. ;-) (we've met him in MD for
>maryland blue crabs).
One reason to use N-connectors is that they assemble with the 9913
and LMR-400 foil shielded cables without need for soldering. Either
the traditional compression-clamp style or crimp style do not require
soldering the shield. The benefit is a better designed RF connector
will less impedance "bump". Of course there still is a lot of radio
equipment that uses the SO-239 receptacle. In those cases one can
make up a jumper cable with RG-58 or RG-8 (RG-213) cable, if you find
assembly of PL-259 on 9913 or LMR-400 is too big a hassle.
I will say that not all PL-259 are equal. I only use Amphenol PL-259
at work as they are silver plated and solder much better. Use of
alcohol to de-grease metal parts before soldering, use of rosin flux,
and sufficient heat all help a lot for less frustrating assembly of
PL-259's. A fellow technician of mine used to use a round file to
file across the solder holes to thin the metal for better soldering
I would also say that not all coax is of equal quality. The cheap
stuff has too little shield density. I use that stuff to make ground radials.
...anyway that's my two-cents on the subject!
Ed - KL7UW
BP40IQ 50-MHz - 10-GHz www.kl7uw.com
144-EME: FT-847, mgf-1801, 4x-xpol-20, 185w
DUBUS Magazine USA Rep dubususa at hotmail.com
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