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mdnanwelch7(at)hotmail.co
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 Posted: Sat Jan 22, 2011 6:44 am Post subject: Belden 9222 triax cable |
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Guys,
I have quite a bit of 50 ohm triax cable. It has the stranded core and has
double shielding. Is this an okay cable to use for a radio and transponder
antenna cable?
Also, does anyone have a drawing how the BNC connector is attached to
the cable?
Thnaks, Mike Welch
[quote][b]
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nuckolls.bob(at)aeroelect
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| Posted: Sat Jan 22, 2011 8:07 am Post subject: Belden 9222 triax cable |
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At 09:38 AM 1/22/2011, you wrote:
| Quote: | Guys,
I have quite a bit of 50 ohm triax cable. It has the stranded core and has
double shielding. Is this an okay cable to use for a radio and transponder
antenna cable?
Also, does anyone have a drawing how the BNC connector is attached to
the cable?
|
The cable is fine. The problem is to insure
compatibility between cable and connector.
What's the part number and brand of the cable?
Bob . . .
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mdnanwelch7(at)hotmail.co
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| Posted: Sat Jan 22, 2011 8:53 am Post subject: Belden 9222 triax cable |
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> > I have quite a bit of 50 ohm triax cable. It has the stranded core and has
| Quote: | >double shielding. Is this an okay cable to use for a radio and transponder
>antenna cable?
>
> Also, does anyone have a drawing how the BNC connector is attached to
>the cable?
The cable is fine. The problem is to insure
compatibility between cable and connector.
What's the part number and brand of the cable?
Bob . . .
|
Hi Bob,
I should have included the cable information in the email itself, rather than just
the subject line. The triax is Belden 9222 004 RG 58 A/U type 50 ohm triaxial
3075 cable.
Here's my confusion; this triax is what Glasair Corp supplied to me as their
comm antenna cable. At one end, the Glasair folks had already soldered a
set of 1/2" wide copper tapes....to be glassed vertically in the vertical stabilizer.
Okay, I did that! But, after the tail is sandwiched together (and no longer accessible),
I THEN find out it is triax!!! Glasair also supplied the 'run of the mill' "Amphenol
31-2-RFX" BNC connector. But this is a COAX connector!!
Glasair says the antenna installation instructions come with the antenna kit, but
I sure can't find them in my paperwork anywhere!
Does anyone have the Glasair comm radio antenna kit instructions (that they can
email me)?? My dilemma is I have the parts, but no instructions.
Additionally, the silly TRIAX BNC connector is over $25 each!! I think I'd rather stay
with the regular coax types, and use their design.....if I had it.
Thanks, Mike Welch
[quote][b]
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nuckolls.bob(at)aeroelect
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| Posted: Sat Jan 22, 2011 1:36 pm Post subject: Belden 9222 triax cable |
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| Quote: |
I should have included the cable information in the email itself, rather than just
the subject line. The triax is Belden 9222 004 RG 58 A/U type 50 ohm triaxial
3075 cable. |
My bad. Missed it completely.
| Quote: |
Here's my confusion; this triax is what Glasair Corp supplied to me as their
comm antenna cable. |
I am confused too. First, RG-58 series coaxial cables are
a legacy product dating back to WWII or perhaps earlier.
It was for a single shield coax with polyethylene inner
insulation and PVC outer insulation. Best we knew how to
do in 1940 and manufactured by the mile since that time.
RG58 as a supported specification (meaning updated periodically
and recommended for new design) fell off the wagon many years
ago. We learned how to do a lot better since then and the
spec was canceled years ago.
Since that time, folks who should know better have been offering
"RG-58 Type" coax cables. At first, they were clones of the
WWII vintage product. But after a time, many of the cables being
offered as replacements for RG-58 began to morph. Here's your
9222 data:
[img]cid:.0[/img]
Here's the original RG-58 data
[img]cid:.1[/img]
Hmmm . . . Still has a 20AWG center conductor. The center pin will go on fine.
Still has a core on the order of .116" so it will probably go down into the
connector. This means that both shields will easily slip over the shield grip
barrel. Here's the problem. With an OD of .240 versus .193, the shield grip
ferrule will not fit over the outer jacket of the coax. You might try installing
a standard RG-58 BNC male. Put a piece of 1/4" heatshrink over the coax.
See if you can strip the outer jacket and peel pack outer shield to remove
the intra-shield insulation. Then see if you can work the shielding over
the connector shield-grip with the ferrule in place. If you can, go ahead
and crimp it. Then cover the slightly non-standard crimp with the heatshrink.
I'm mystified as to why anyone would supply this sort of coax . . . except that
obviously, more shielding has to be better than less shielding. The "RG-58"
notation probably misled them into believing that they were form/fit/function
interchangeable. Not so for obvious reasons.
| Quote: | Additionally, the silly TRIAX BNC connector is over $25 each!! I think I'd rather stay
with the regular coax types, and use their design.....if I had it. |
If it's a TRUE triax connector, it will maintain
separation of the two shields through the connector
and wouldn't even fit the back of your radio. It also
occurs to me that an RG-59 BNC connector will be
configured for slightly large diameters and could
be the elegant answer . . . but those go on with different
dies. I've not installed one of those since my video
days!
My best recommendation is to 'jeep' the RG-58 connector
on by treating the two shields as one shield.
Bob . . .
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mdnanwelch7(at)hotmail.co
Guest
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| Posted: Sat Jan 22, 2011 3:09 pm Post subject: Belden 9222 triax cable |
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>My best recommendation is to 'jeep' the RG-58 connector
| Quote: | on by treating the two shields as one shield.
|
>Bob . . .
Hi Bob, your suggestion is EXACTLY what they had in mind!!!!
I failed to mention in my previous reply that the heatshrink was, in fact,
also included in the GlaStar antenna kit, although exactly how to install the whole
arrangement was still a mistery. So, I did some experimenting......
Eventually, I kind of figured out what the whole picture was, so I tried the 'jeep'
method earlier today. Actually works out quite nicely, too.
What I did was; remove the outer yellow jacket and the outer shielding
about 1 1/4". Next, I put on the 2 1/2" piece of heatshrink and shrunk it up nice
and tight. (heatshrink was yellow, so everything so far looks like it was planned).
At this point, the 'necked down' part that's about 1 1/4" long, is encapsulated in
heatshrink is virtually perfect for the 'run of the mill' BNC connector's I.D..
Once I had the outer layers of jacket and shield removed, and replaced them with the
heatshrink, it was just a matter of installing a typical BNC connector. Seems
to look really nice, and a quick continuity test showed no stray wires where they
shouldn't have been!!
Thanks for your help, Bob!!
Mike Welch
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raymondj(at)frontiernet.n
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| Posted: Sat Jan 22, 2011 4:03 pm Post subject: Belden 9222 triax cable |
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do not archive
Apparently I've missed something. What is the meaning of "jeep"?
Raymond Julian
Kettle River, MN
On 01/22/2011 05:04 PM, Mike Welch wrote:
| Quote: | >My best recommendation is to 'jeep' the RG-58 connector
>on by treating the two shields as one shield.
>Bob . . .
Hi Bob, your suggestion is EXACTLY what they had in mind!!!!
I failed to mention in my previous reply that the heatshrink was, in fact,
also included in the GlaStar antenna kit, although exactly how to
install the whole
arrangement was still a mistery. So, I did some experimenting.......
Eventually, I kind of figured out what the whole picture was, so I tried
the 'jeep'
method earlier today. Actually works out quite nicely, too.
What I did was; remove the outer yellow jacket and the outer shielding
about 1 1/4". Next, I put on the 2 1/2" piece of heatshrink and shrunk
it up nice
and tight. (heatshrink was yellow, so everything so far looks like it
was planned).
At this point, the 'necked down' part that's about 1 1/4" long, is
encapsulated in
heatshrink is virtually perfect for the 'run of the mill' BNC
connector's I.D..
Once I had the outer layers of jacket and shield removed, and replaced
them with the
heatshrink, it was just a matter of installing a typical BNC connector.
Seems
to look really nice, and a quick continuity test showed no stray wires
where they
shouldn't have been!!
Thanks for your help, Bob!!
Mike Welch
|
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nuckolls.bob(at)aeroelect
Guest
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| Posted: Sat Jan 22, 2011 8:21 pm Post subject: Belden 9222 triax cable |
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At 06:59 PM 1/22/2011, you wrote:
do not archive
Apparently I've missed something. What is the meaning of "jeep"?
Sorry 'bout that. I think I picked that up in
the video business when I was building and servicing
time-base correctors. To "jeep" something was to
modify it in some manner that made it useful in
an application not originally intended.
We liked Sony Trinitron monitors at the workstations
but professional monitors were $1000+. A tech at
channel 3 showed me how to 'jeep' small Trinitron
TV's to make monitors for $400 each. I don't think
I've heard the term used anywhere else.
Bob . . .
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