Michael Black wrote:
On Tue, 16 Sep 2014, wrote:

In rec.radio.amateur.homebrew Michael Black wrote:
On Tue, 16 Sep 2014, Jeefaw K. Effkay wrote:

On 16/09/2014 16:53, Jerry Stuckle wrote:

Ah, heck - don't make it so easy. A REAL HAM would mine and smelt his
own ore (using a garden trowel and blowtorch). He would create his own
insulating material from raw materials (bakelite would probably be
easiest), and finally shape and assemble the final product.

A real ham wouldn't make coaxial connectors.

A real ham would be using a link-coupled output from his PA, to a balanced
transmission line.

And you can certainly make ladder line yourself, once you figure out
something for the spacers. I doubt anyone's ever made coax at home.

Michael

I've made short lengths of rigid, air dielectric coax for UHF projects
from hobby store brass tubing on several occasions.

That's true. For inside a chassis. And I suppose making rigid is much
easier than making flexible coax, since you can get that brass tubing.

Michael

Actually for feeds on UHF antennas; judicious selection of tubing size
allows female N connectors to be soldered on the end.


--
Jim Pennino

Michael Black wrote in
news:alpine.LNX.2.02.1409161603130.29800@darkstar. example.org:

I've made short lengths of rigid, air dielectric coax for UHF projects
from hobby store brass tubing on several occasions.

That's true. For inside a chassis. And I suppose making rigid is much
easier than making flexible coax, since you can get that brass tubing.


I've never used it for that (not done much RF work at all), but I like it,
it's very precise (and in the UK and on eBay precision imperial sized tools
to go with it are often a lot cheaper than metric, and mixing units can offer
suprising answers to tough problems, like tight fits of 4mm into a 5/32 hole
or a bit of that tubing of same size ID (3.96875mm). (Which incidentally
might help answer the original question, as one way to make accurate DIY 4mm
sockets.) Brass brazing rods can also be used, they're supplied very clean,
straight, and with even thicknesses, and I suspect hard drawn quality too.

If I had to make a aired cored coax I might hard-draw a bit of stripped mains
cable by hanging it off the top of a door and putting my weight on it to pull
the other end. I have done that a few times and got very good straight copper
bars that way in thicknesses up to about 2mm diameter.

"Lostgallifreyan" wrote in message
.. .
Stephen Thomas Cole wrote in
:

Just an FYI. Big G is trolling, here. He's currently being shunned in
uk.radio.amateur as the good and decent users of that group have finally
had enough of him. Consequently, he's starved for attention, hence the
inane postings he's vomiting left, right and centre. He's best avoided.


Well, no problem there. I just took up the suject as I saw it. I won't try
to
talk to Gareth directly, he has never once responded to me as far as I
know.
I suspect maybe I do not have the right kind of degree and gentlemanly air
of
electromic authority for him to deign to even notice me.

I replied to you on the 28th August last ...

"Lostgallifreyan" wrote in message
. ..
"gareth" wrote in news:lthnu9$ilc$1@dont-
email.me:
There have been designs published in Brit of using the steel of
wind-up tape measures, and this could be a potential starting point
for any discussion, by the use of flat metal tape.
I suspect my notion is not new, but what about a coil of wire, some well-
spaced trees, a long lanyard, a tennis ball, and a spud gun?
Someone will likely have one they prepared earlier, so I won't put the
bits
together.

A well-tried and tested solution to one problem, but I'd be interested in a
structure that when you go QRT, you could then retract it back.

"gareth" wrote in news:lva5pq$57b$1@dont-
email.me:

I replied to you on the 28th August last ...


I stand corrected.

Lostgallifreyan wrote:
Stephen Thomas Cole wrote in
:

Just an FYI. Big G is trolling, here. He's currently being shunned in
uk.radio.amateur as the good and decent users of that group have finally
had enough of him. Consequently, he's starved for attention, hence the
inane postings he's vomiting left, right and centre. He's best avoided.


Well, no problem there. I just took up the suject as I saw it. I won't try to
talk to Gareth directly, he has never once responded to me as far as I know.
I suspect maybe I do not have the right kind of degree and gentlemanly air of
electromic authority for him to deign to even notice me.

Sadly, he appears to be mentally defective.

--
Stephen Thomas Cole // Sent from my iPhone

"Jeefaw K. Effkay" wrote:
On 16/09/2014 17:49, Jerry Stuckle wrote:
On 9/16/2014 12:33 PM, Jeefaw K. Effkay wrote:
On 16/09/2014 16:53, Jerry Stuckle wrote:

Ah, heck - don't make it so easy. A REAL HAM would mine and smelt his
own ore (using a garden trowel and blowtorch). He would create his own
insulating material from raw materials (bakelite would probably be
easiest), and finally shape and assemble the final product.

A real ham wouldn't make coaxial connectors.

A real ham would be using a link-coupled output from his PA, to a
balanced transmission line.

PS - don't feed the troll :-)


Why said they were coax connectors for a transmitter? I use various
types of connecters for many things. For instance, my Tektronix scope
has BNC connectors for the probes. And my rigs have connectors for the
microphones.

Real hams don't use microphones. They only use CW :-)

Plus I wouldn't use balanced line in the car.

OK - you win :-)

It's illegal to text while driving, but what about using a key?

--
73 de Frank Turner-Smith G3VKI - mine's a pint.

wrote in message
...

I've made short lengths of rigid, air dielectric coax for UHF projects
from hobby store brass tubing on several occasions.

.... and for the main line in an SWR meter

On 16/09/2014 19:43, gareth wrote:
"Michael Black" wrote in message
news:alpine.LNX.2.02.1409161411150.29263@darkstar. example.org...
I doubt anyone's ever made coax at home.

It would be an interesting exercise to conceive of the mechanism
for weaving the braid, such that it was tight onto the dielectric

Would you need to weave braid?
Could it not be made by wrapping the dielectric in foil?
Spiral winding foil or otherwise wrapping in foil would seem to be a lot
easier than braiding on the fly.

Andy

On 16/09/2014 19:10, Michael Black wrote:

Especially when you can find them lying on the sidewalk.

Some years back, I came upon a pile of junk on the sidewalk, waiting for
the garbage truck. I poke around, and find a near endless number of BNC
connectors. I grab some, then continue on my way. Coming back, the
rest were still there so I grabbed all of them. QUite a weight once
accumulated.

There were a few hundred BNC connectors.

I wonder if this was at the time when networks were moving from coax to
UTP? I still have a wonderful collection of BNC patch leads which were
surplus when my company switched over.

Les.

"Lordgnome" wrote in message
...
On 16/09/2014 19:10, Michael Black wrote:

Especially when you can find them lying on the sidewalk.

Some years back, I came upon a pile of junk on the sidewalk, waiting for
the garbage truck. I poke around, and find a near endless number of BNC
connectors. I grab some, then continue on my way. Coming back, the
rest were still there so I grabbed all of them. QUite a weight once
accumulated.

There were a few hundred BNC connectors.

I wonder if this was at the time when networks were moving from coax to
UTP? I still have a wonderful collection of BNC patch leads which were
surplus when my company switched over.

Including some 50 ohm terminators that are far too small to be any good as a
dummy load?