Stacking Winegard HD-6065P antennas
 

"Jeff Liebermann" wrote in message
...
This is more fun:
http://802.11junk.com/jeffl/antennas/connector-loss/index.html
Just take every connector that you can find, put them in series, and
measure the loss. In this case, it was done at 2.4Ghz and 450MHz. End
to end loss at 2.4GHz was 2dB for about 25 adapters or about 0.08dB
per adapter. At 250MHz, the loss was about 0.2dB or 0.008dB per
adapter.

I've done similar demonstrations using two wattmeters at the local
radio club meeting. The results are typically that the adapter string
has the same loss as an equivalent length of small coax cable. I had

I have done something similar. Hook all the adaptors I could find to my hp
8924c and sweep from 30 to 1000 mhz (limit of the equipment). Not much loss
at all.

Best demonstration is to apply power. Even at 1 db of loss and running 1 kw
you would have over 100 watts of heat. Enough to burn your hand in a few
seconds.

The only way I have seen demonstrared is when the connectors creat an
impedance bump and it may take a couple of them in series so the effects
multiply much greater than just adding the losses.
They may have to be a certain ammount of wavelength apart for this to hapen.
The effect is that you have a long piece of coax with a very high SWR.



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Stacking Winegard HD-6065P antennas
 

On 1/10/2014 10:23 PM, Ralph Mowery wrote:
"Jeff Liebermann" wrote in message
...
On Fri, 10 Jan 2014 19:36:59 -0500, Jerry Stuckle
Actually, it's not the crimp job that kills the connection. It's the
stripping of the coax that causes the most problems. I use various
rotary contrivances that have razor blades to make the cuts at the
correct spacing. Those work well initially, but after about 50
connectors, the blades become dull and useless. Of course, nobody has
spare blades or knows how to adjust them. They either continue to use
a dull razor or steal my new stripper.


I don't know the quality of the cutters you use, but I have bought several
from China off ebay for about $ 2 each including shipping. For the very few
connectors I do, they work. At that price, you could order a lot of them
and not worry about the replacement blades. Just like the disposiable
razors. They seem identical to the ones that sell in stores for $ 10 to $
15 .



Ralph,

They may seem identical, but they aren't. The $10-15 ones last much,
much longer. However, unless you're doing it full time, it probably
doesn't pay to get the more expensive ones.

We tried one of the cheap ones. After about 3 weeks the tech threw it
as far as he could because he was so frustrated. The ones we have now
typically last a year or more (we don't really track them).

--
==================
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Jerry, AI0K

==================

Stacking Winegard HD-6065P antennas
 

On Fri, 10 Jan 2014 22:23:17 -0500, "Ralph Mowery"
wrote:


"Jeff Liebermann" wrote in message
.. .
On Fri, 10 Jan 2014 19:36:59 -0500, Jerry Stuckle
Actually, it's not the crimp job that kills the connection. It's the
stripping of the coax that causes the most problems. I use various
rotary contrivances that have razor blades to make the cuts at the
correct spacing. Those work well initially, but after about 50
connectors, the blades become dull and useless. Of course, nobody has
spare blades or knows how to adjust them. They either continue to use
a dull razor or steal my new stripper.

I don't know the quality of the cutters you use, but I have bought several
from China off ebay for about $ 2 each including shipping. For the very few
connectors I do, they work. At that price, you could order a lot of them
and not worry about the replacement blades. Just like the disposiable
razors. They seem identical to the ones that sell in stores for $ 10 to $
15 .

Those are the same cutters that I like to use. Good, cheap, easy to
use, and throw away when dull. (I've tried resharpening the blades
with poor results).

This style is my favorite:
http://www.ebay.com/itm/400525856013
but these also work and are usually cheaper:
http://www.ebay.com/itm/360806269903
There are other designs, but I haven't used them.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

Stacking Winegard HD-6065P antennas
 

On Fri, 10 Jan 2014 18:06:54 -0800, Jeff Liebermann
wrote:
(...)
Actually, it's not the crimp job that kills the connection. It's the
stripping of the coax that causes the most problems. I use various
rotary contrivances that have razor blades to make the cuts at the
correct spacing. Those work well initially, but after about 50
connectors, the blades become dull and useless. Of course, nobody has
spare blades or knows how to adjust them. They either continue to use
a dull razor or steal my new stripper.

Oops... dinner... gone.

The problem with the dull cutter usually creates problems where the
dielectric ends, and where the solid center conductor is exposed. The
dull blade pushes the aluminum shield over the end of the dielectric,
shorting the aluminum or the braid wire to the center conductor. Even
if it doesn't immediately short, some movement of the cable can cause
it to short. When it gets to this point, I have to take a sharp knife
and cut back the shielding so that it won't short. However, once the
connector is pushed in place, it can't be checked or repaired.

I can offer several other ways to do it wrong, but that should suffice
for now.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

Stacking Winegard HD-6065P antennas
 

On 1/10/2014 11:13 PM, Jeff Liebermann wrote:
On Fri, 10 Jan 2014 18:06:54 -0800, Jeff Liebermann
wrote:
(...)
Actually, it's not the crimp job that kills the connection. It's the
stripping of the coax that causes the most problems. I use various
rotary contrivances that have razor blades to make the cuts at the
correct spacing. Those work well initially, but after about 50
connectors, the blades become dull and useless. Of course, nobody has
spare blades or knows how to adjust them. They either continue to use
a dull razor or steal my new stripper.

Oops... dinner... gone.

The problem with the dull cutter usually creates problems where the
dielectric ends, and where the solid center conductor is exposed. The
dull blade pushes the aluminum shield over the end of the dielectric,
shorting the aluminum or the braid wire to the center conductor. Even
if it doesn't immediately short, some movement of the cable can cause
it to short. When it gets to this point, I have to take a sharp knife
and cut back the shielding so that it won't short. However, once the
connector is pushed in place, it can't be checked or repaired.

I can offer several other ways to do it wrong, but that should suffice
for now.


We don't let them get even close to that dullness. Our techs can tell
when they're starting to get dull and replace them because problems will
start much before when the shield pushes the shield over. For instance,
the inner dielectric will distort, making it harder to install the
connector.

--
==================
Remove the "x" from my email address
Jerry, AI0K

==================

Stacking Winegard HD-6065P antennas
 

"Jerry Stuckle" wrote in message
...
,

They may seem identical, but they aren't. The $10-15 ones last much, much
longer. However, unless you're doing it full time, it probably doesn't
pay to get the more expensive ones.

We tried one of the cheap ones. After about 3 weeks the tech threw it as
far as he could because he was so frustrated. The ones we have now
typically last a year or more (we don't really track them).


You probably do more connectors in a week than I will ever do. For me , it
won't pay, but for you it will if they last that much longer. Must be the
quality of the blades as I can not tell any differance in the couple I
bought from China for $ 2 and the one I bought here for $ 15.
I just bought one for each size and type of cable I use.
I don't do the TV connectors, just the BNC,N,PL259 types.




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In message , Jerry Stuckle
writes



The best (and the ones we use) compress the entire base of the
connector evenly, creating a smooth crimp. The end of the coax is
evenly covered by the connector.

In the CATV industry, for F-connectors, isn't Snap-n-Seal now de the
norm?

--
Ian

Stacking Winegard HD-6065P antennas
 

On 1/10/2014 11:39 PM, Ralph Mowery wrote:
"Jerry Stuckle" wrote in message
...
,

They may seem identical, but they aren't. The $10-15 ones last much, much
longer. However, unless you're doing it full time, it probably doesn't
pay to get the more expensive ones.

We tried one of the cheap ones. After about 3 weeks the tech threw it as
far as he could because he was so frustrated. The ones we have now
typically last a year or more (we don't really track them).


You probably do more connectors in a week than I will ever do. For me , it
won't pay, but for you it will if they last that much longer. Must be the
quality of the blades as I can not tell any differance in the couple I
bought from China for $ 2 and the one I bought here for $ 15.
I just bought one for each size and type of cable I use.
I don't do the TV connectors, just the BNC,N,PL259 types.



Yup, one tech can do upwards of 50 connectors a day on a large project.
Mostly F and RJ-45, but also some RCA and others. It counts up
quickly! :)

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Stacking Winegard HD-6065P antennas
 

On 1/11/2014 5:24 AM, Jeff wrote:


As for handling more power - rubbish. The current in 75 ohm coax is
lower than that in 50 ohm coax, for the same power rating.


Can you not see the stupidity if that remark???

Jeff


It is perfectly true. P=I^2xR. As R increases, I MUST decrease to
handle the same power. And since current is the limiting factor in
wire, you don't need as large a gauge of wire to handle more power.

You really should learn what you're talking about before opening your
"mouth". You only continue to show your ignorance.

--
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Stacking Winegard HD-6065P antennas
 

On 1/11/2014 3:44 AM, Ian Jackson wrote:
In message , Jerry Stuckle
writes



The best (and the ones we use) compress the entire base of the
connector evenly, creating a smooth crimp. The end of the coax is
evenly covered by the connector.

In the CATV industry, for F-connectors, isn't Snap-n-Seal now de the norm?


Maybe for cable companies who are trying to be cheap. But the
professional integrators around here all use crimp-on. Not much more
expensive and saving one callback pays for a lot of connectors.

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