Hello:

Went to R/S today to pick up some BNC connectors to make a short coax patch
wire.

Was somewhat surprised to see that they only carry, now, the "screw-on"
variety.
No more soldered ones.

Apparently you insert the stripped end of the coax into the connector, and
twist a portion of the rear
of the connector barrel which clamps the braid.
My guess is that this probably is OK for the braid, but I can't imagine how
it connects, relaiably, to the center pin.

Looking at it in the package, it seems the coax wire just pokes into the
center pin, and that's that.
Maybe they expect gravity to make a contact.

Seems like this would make a really poor connector, but perhaps I'm too old
fashioned in thinking that
the only good contact is a soldered one.

Am I missing anything here ?

Do they actually work ?
Work good enough for a receiver's coax run ?

Thanks,
Bob

Hi:
I like the crimp on BNC's myself but the solder kind are OK. The twist on RS
ones are probably OK in low frequency low power but I wouldn't trust them
myself. In fact, I wouldn't buy one except in desperation.
Your concerns are the same ones I have. As I can buy Amphonal crimp BNC's
for $1.85 each anywhere, I would invest $50 in a crimp tool and go that
route.


--
John Passaneau W3JXP
State College Pa

This mail is a natural product. The slight variations in spelling and
grammar enhance its individual character and beauty and in no way are to
be considered flaws or defects.





"Robert11" wrote in message
...
Hello:

Went to R/S today to pick up some BNC connectors to make a short coax
patch
wire.

Was somewhat surprised to see that they only carry, now, the "screw-on"
variety.
No more soldered ones.

Apparently you insert the stripped end of the coax into the connector, and
twist a portion of the rear
of the connector barrel which clamps the braid.
My guess is that this probably is OK for the braid, but I can't imagine
how
it connects, relaiably, to the center pin.

Looking at it in the package, it seems the coax wire just pokes into the
center pin, and that's that.
Maybe they expect gravity to make a contact.

Seems like this would make a really poor connector, but perhaps I'm too
old
fashioned in thinking that
the only good contact is a soldered one.

Am I missing anything here ?

Do they actually work ?
Work good enough for a receiver's coax run ?

Thanks,
Bob

"John Passaneau" wrote in message
...
Hi:
I like the crimp on BNC's myself but the solder kind are OK. The twist on
RS
ones are probably OK in low frequency low power but I wouldn't trust them
myself. In fact, I wouldn't buy one except in desperation.
Your concerns are the same ones I have. As I can buy Amphonal crimp BNC's
for $1.85 each anywhere, I would invest $50 in a crimp tool and go that
route.

I also have serious doubts about the screw-on BNCs for anything but low
power
and low frequency - they may work moderately well for video, but I wouldn't
trust them for RF either.

WRT the crimped variety, the military uses them extensively and test data
seems
to clearly indicate that they are 1) easier to assemble correctly, given the
correct
strip lengths and crimping tool, and 2) if properly assembled they are at
least as
reliable as soldered BNCs and probably moreso.

I use crimp BNCs exclusively when I want BNC connectors.

73,
Carl - wk3c

On Thu, 20 Nov 2003 15:26:46 -0000, "Carl R. Stevenson"
wrote:

I also have serious doubts about the screw-on BNCs for anything but low
power
and low frequency - they may work moderately well for video, but I wouldn't
trust them for RF either.


Hi Carl,

I've measured the properties of BNC/RG-58 out into the GHz and aside
from loss (easily referenced by numerous sources), there are no
surprises. If you trust them for Video, that makes them premium
choices as Video is far more demanding than RF (at least into the HF).
However, as terms, Video and RF are hardly distinctive except that
Video describes an implicit bandwidth and modulation (which
encompasses much of the HF) which is, of necessity, RF.

So, the choice is: do you use BNC for 100KHz-12MHz Video; or do you
use BNC for 100KHz - 1GHz RF? People only abandon BNC for small
geometry considerations: components too close together for breakdown
at high power at high frequency or too small for the currents
involved. Actually, most of those arguments are cable based. In
other words, if you don't trust BNC for any of a variety of reasons,
you are actually arguing against the use of the associated cable it
comfortably mates to. SO/PL are larger dimensionally, but beyond VHF
they are definitely inferior to the smaller BNC.

73's
Richard Clark, KB7QHC

"Richard Clark" wrote in message
...
On Thu, 20 Nov 2003 15:26:46 -0000, "Carl R. Stevenson"
wrote:

I also have serious doubts about the screw-on BNCs for anything but low
power
and low frequency - they may work moderately well for video, but I
wouldn't
trust them for RF either.


Hi Carl,

I've measured the properties of BNC/RG-58 out into the GHz and aside
from loss (easily referenced by numerous sources), there are no
surprises. If you trust them for Video, that makes them premium
choices as Video is far more demanding than RF (at least into the HF).
However, as terms, Video and RF are hardly distinctive except that
Video describes an implicit bandwidth and modulation (which
encompasses much of the HF) which is, of necessity, RF.

So, the choice is: do you use BNC for 100KHz-12MHz Video; or do you
use BNC for 100KHz - 1GHz RF? People only abandon BNC for small
geometry considerations: components too close together for breakdown
at high power at high frequency or too small for the currents
involved. Actually, most of those arguments are cable based. In
other words, if you don't trust BNC for any of a variety of reasons,
you are actually arguing against the use of the associated cable it
comfortably mates to. SO/PL are larger dimensionally, but beyond VHF
they are definitely inferior to the smaller BNC.

73's
Richard Clark, KB7QHC

Richard,

I know well that BNCs are good into the GHz range - if properly installed to
maintain impedance.

My reservation is not with BNCs, but with the screw-on variety, which I
don't trust.

Properly installed solder-on BNCs or crimped ones are fine. I prefer the
crimp ones myself as they are easier to install and at least as reliable as
the soldered ones.

I think you missed my point - I hope this clarifies.

73,
Carl - wk3c

Shucks,

Why not use F connectors?

Jack K9CUN

Actually, these connectors were originally designed for LAN service (IBM
3764) controller. and, have been used
for coax for other services- tho they may not meet everyones needs at 1 gig
range, the still will beat the pants off of
SO-239-PL259, when comes to impedence shifting (transformation). as it
takes a fair amount of length to cause
an impedence transformation (1/4 wavelength for maximum effect), and the
length of the connector parts is quite
small by comparison, should be ok to a fairly high frequency, even figureing
the velocity factors of the coax, and
the connectors dielectriecs! It might not be perfect, but then, these work
great for test cables, and other applications
and, still would beat the crap out of the afformentioned (and misnamed)
"UHF" connectors! Their biggest disadvantage(s)
a 1) that these , unlike a normal bnc, are available in 1 size (read -
one IMPEDENCE) only (remember the
lans versions were at aprox. 90 ohm!) and 2) they won't work with stranded
center conductors. Otherwise, these are
much prefered to adaptors, and connnectorsnwith components that are longer
then the center pins of these bnc's (at least
in my book,) and wouldn't hesitate to use them in place of "UHF" connectors
, especially when useing smaller size
coax. And, for OVERKILL, look at HARRIS radios, useing SMA connectors to
measure BASEBAND LEVELS
to a max of maybe 4 MHz ( stacked SSB signals, 4 KHz apart, maybe 600
channels , tops! ! Need I say more??
Jim NN7K





"John Passaneau" wrote in message
...
Hi:
I like the crimp on BNC's myself but the solder kind are OK. The twist on
RS
ones are probably OK in low frequency low power but I wouldn't trust them
myself. In fact, I wouldn't buy one except in desperation.
Your concerns are the same ones I have. As I can buy Amphonal crimp BNC's
for $1.85 each anywhere, I would invest $50 in a crimp tool and go that
route.

Went to R/S today to pick up some BNC connectors to make a short coax
patch
wire.

Was somewhat surprised to see that they only carry, now, the "screw-on"
variety.
No more soldered ones.

Apparently you insert the stripped end of the coax into the connector, and
twist a portion of the rear
of the connector barrel which clamps the braid.
My guess is that this probably is OK for the braid, but I can't imagine
how
it connects, relaiably, to the center pin.

Looking at it in the package, it seems the coax wire just pokes into the
center pin, and that's that.
Maybe they expect gravity to make a contact.

Seems like this would make a really poor connector, but perhaps I'm too
old
fashioned in thinking that
the only good contact is a soldered one.

Am I missing anything here ?

Do they actually work ?
Work good enough for a receiver's coax run ?

Almost nothing from RS works very well . They do have some already built
things with a good reputaion but you have to be careful even then.

Almost nothing from RS works very well .

That's a very general statement Ralph. I have bought electronic components and
various connectors from Radio Shack for 28 years and all worked. (works, works
well, or works very well, take your pick). I paid more for them, but that was
because they were the only place I could get the stuff I needed locally. I
have bought things from my local electronics supply house lately that didn't
work, and they are not open on weekends.
RS doesn't manufacture their components or connectors. They are reselling.
I for one am glad they do, they have saved me time and money persuing this
Hobby. As to whether the solderless BNC connector works, the RS one will work
as good or bad as OEM.
73 Gary N4AST

"JGBOYLES" wrote in message
...
Almost nothing from RS works very well .

That's a very general statement Ralph. I have bought electronic
components and
various connectors from Radio Shack for 28 years and all worked. (works,
works
well, or works very well, take your pick). I paid more for them, but that
was
because they were the only place I could get the stuff I needed locally.
I
have bought things from my local electronics supply house lately that
didn't
work, and they are not open on weekends.
RS doesn't manufacture their components or connectors. They are
reselling.
I for one am glad they do, they have saved me time and money persuing this
Hobby. As to whether the solderless BNC connector works, the RS one will
work
as good or bad as OEM.
73 Gary N4AST

Last time I went into my local Radio Shack, I found they didn't stock 50 ohm
coax anymore. Special order; yes. On the shelf; no.

Ed
wb6wsn