Date: Thu, 28 Jun 2018 09:29:37 -0400
From: "john@kk9a.com" <john@kk9a.com>
To: towertalk@contesting.com
Subject: Re: [TowerTalk] N connector, Re: UHF (PL259) soldered center
with braid
<A 7-16 DIN also uses a flat step on the pin for the center connection.
<The pin is mostly tapered.
<The N HF power rating is more than sufficient for amateur radio. How much
<contact surface is on your antenna and amplifier relays?
<John KK9A
## To add to the connector confusion, they also make a 10-32 connector....and
also a 13-30 connector...
and an even bigger 25-80 connector.
## years ago, when I looked at all this, Andrew had discontinued making a UHF
male for .875 heliax.
The only thing available was the type N....and the 7-16 DIN......pick one.
Ditto with LMR-1200DB.
## I also looked at LC connectors, and also C connectors. LC connectors are
out of vouge. They came in
2 types, 50 ohm, and 52 ohm. The solid center conductor of the 52 ohm RG-17
was the pin. Ditto with the
solid center conductor of the 50 ohm RG-218 and RG-219. LC connectors,
chassis females, right angle connectors
are huge things, too big, too expensive. I don’t believe you can even get LC
connectors for heliax anymore. The
50 and 52 ohm connectors are not compatible either. The larger center
conductor diam of the 50 ohm RG218 and
double shielded RG219 has to have its solid copper center conductor filed down
to fit the older, smaller diam 52 ohm
chassis connectors. RG-17 makes a sloppy fit on newer 50 ohm connectors.
Beware when buying surplus.
## Having had various issues with type N previously on 213 cable, I opted
to swap everything to the
7-16 Din. The 7-16 din chassis female is hardly any bigger than a SO-239 or
Type N. Its relatively cheap,
handles loads of current, and has a high peak V stand off rating. I have
seen 20 kw stuffed through the 7-16 Din
on 2-30 mhz, with no issues. They also make 7-16 female chassis
connectors.. with smaller back end square flange.... to mate to
the 4 x holes of either a type N or a SO-239 connector.
## Im not a vhf or uhf guy, but I would be bit leery about running 2.5 kw
into a 50 mhz, 144 mhz, 220 mhz, or 440 mhz array,
using Type N connectors. Toss in some swr, and things get dicey.
Legal limit in canada is 2250 watts pep out on ssb. 750 w with cxr modes like
cw, fm, rtty. 750 watts
cxr on AM..and 3000-3750 pep output on AM. And all of that is measured at
the feedpoint, not the back of the amp. Typ I need at least
2.5 kw from any amp..just to get 2250 w at the ant feed point....assuming 10%
feedline and connector loss. 10% is like .5 db loss.
7-16 connectors are now readily available on the surplus market.
Jim VE7RF
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