DirecTV has used them exclusively at my QTH for 30 plus years. They do
appear to have some kind of 0-ring or other sealing method. The weather
has never bothered them. Bob - W3YY
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
john@kk9a.com
Sent: Wednesday, March 13, 2019 10:01 PM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] F-connectors
I am wondering why F connectors are popular in amateur radio stations? They
are not waterproof, maybe partially if an o-ring is added. Basically as
Terry noted they are a cheap connector that has no center pin other the coax
wire.
John
Zivney, Terry N4TZ wrote:
Beware of buying 4-hole flange mount female f-connectors online.
I had problems with the PCB mounted connectors supplied with the
YCCC receiving antenna kits for the chokes, so I purchased
"10x F-Type 4 Hole Panel Mount Jack Connector with extended dielectric
solder post"
from an online auction site.
The connectors look beautiful.
HOWEVER, I could not use them with my BNC-F adapter for test equipment
measurements.
REAL F-connectors are an engineering genius. Low cost, reasonable
reliability.
This is a result of the two parallel spring fingers that make up the center
contact
in REAL F-connectors. This accommodates a variety of sizes of center
conductors
from different sizes of coax.
The online beauties appear to have a simple machines single-diameter center
contact, which limits the size of conductor which can be used. This might be
ok
with high-precision connectors like REAL SMA connectors, but is a poor
manufacturing
design when used as an F-connector.
I solved the problem with the supplied PCB connectors by purchasing some
external tooth lock washers to bite into the PVC pipe caps used in the YCCC
choke design. I also used solder lugs to make the connection to the
F-connectors.
I could not determine from the picture in the Digikey catalog whether the
pricey Amphenol connector have the same flawed design. The manufacturer's
drawing
is mute on this important point.
Terry N4TZ
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