Antenna physical size
 

Art Unwin wrote:

Considering that it meets Maxwells requirements and is at least a
wavelenght
of a radiator my expectations are much higher than yours
I suspect that the output will exceed that of a 160 M antenna which
has a ground plane.
I also suspect that if I diddn't concentrated so much on small
physical size it could easily be uprated
to compete with a yagi!

I can hardly wait for the trials, Art.

Either way the
experimental trail undertaken I have found to
be very rewarding as many other amateurs have had when experimenting
with antennas and who refuse
to accept that all is known

Perhaps you're repeating the attempts of those experimenters of long
ago, who knew and discarded.

Dave K8MN

Antenna physical size
 

Art Unwin wrote:

OK mike one last time.
Make a former to wind apon.
Set it up vertically and secure so that it doesn't fall over.
Get two reels of insulated wire preferbly pre wound paired
wire on each reel. Join the paired wires
Put the joint at the rear of the former with one reel to the left
and one reel to the right.
Wnd one wire clockwise and then wind counterclockwise the
wire from the other reel. Repeat these two functions making
sure the overlapped wires stay parallel with each other.
When you have completed the length of the spool then join
one wire to another wire from the opposite reel. You now have two
wires in your hands
one from each of the reels. These two wires are what you connect to
the transmission line..
Suggestions for the former. Make two cross arrangements using 1/2 inch
plastic piping.
At each of the 8 ends place a tee connection. Four pipes around a foot
long can the join the two sections,
Use tees instead of elbows so the antenna is easier to mount.
If you want it to be all frequencie:
Cut a 1/2 inch plastic pipe in half,' length wise.
Make wire loops and fit them over the cut pipe and solder them tight.
Place a quick start threaded rod inside the cut pipe with a motor at
one end.
Make a electrical wiper to place on the quick start thread to make
electrical
connection to the loops as the motor turns.
Connect a meter to one of the start wires and disconnect it from the
joint.
Place a sowing needle on the other end of the instrument and pierce
the
wires in sequence until one
gets to the coax connection points marking each wire that is
connected to the meter.
Connect the marked wires to the loop that were made sp electrical
contact
can be made to the threaded shaft
Connect the shaft to one of the wires that consists of the feed
points.
Rejoin the wire connections at the start point so that now you have a
complete electrical
circuit starting at the feed points
Place assembly anywhere and apply power and have a qso.
Now will somebody that is savvy with computors do that excercise that
I suggested
with regard to tipped radiators and report on it before you make this
antenna or start
tilting towers around ten degrees sinc the change is not worth it when
calculating total gain?

Well, there it is. I'm going to scrounge a "former" and a "sowing"
needle and get right to work.

Dave K8MN

Antenna physical size
 

Dave Heil wrote:
Art Unwin wrote:

OK mike one last time.
Make a former to wind apon.
Set it up vertically and secure so that it doesn't fall over.
Get two reels of insulated wire preferbly pre wound paired
wire on each reel. Join the paired wires
Put the joint at the rear of the former with one reel to the left
and one reel to the right.
Wnd one wire clockwise and then wind counterclockwise the
wire from the other reel. Repeat these two functions making
sure the overlapped wires stay parallel with each other.
When you have completed the length of the spool then join
one wire to another wire from the opposite reel. You now have two
wires in your hands
one from each of the reels. These two wires are what you connect to
the transmission line..
Suggestions for the former. Make two cross arrangements using 1/2 inch
plastic piping.
At each of the 8 ends place a tee connection. Four pipes around a foot
long can the join the two sections,
Use tees instead of elbows so the antenna is easier to mount.
If you want it to be all frequencie:
Cut a 1/2 inch plastic pipe in half,' length wise.
Make wire loops and fit them over the cut pipe and solder them tight.
Place a quick start threaded rod inside the cut pipe with a motor at
one end.
Make a electrical wiper to place on the quick start thread to make
electrical
connection to the loops as the motor turns.
Connect a meter to one of the start wires and disconnect it from the
joint.
Place a sowing needle on the other end of the instrument and pierce
the
wires in sequence until one
gets to the coax connection points marking each wire that is
connected to the meter.
Connect the marked wires to the loop that were made sp electrical
contact
can be made to the threaded shaft
Connect the shaft to one of the wires that consists of the feed
points.
Rejoin the wire connections at the start point so that now you have a
complete electrical
circuit starting at the feed points
Place assembly anywhere and apply power and have a qso.
Now will somebody that is savvy with computors do that excercise that
I suggested
with regard to tipped radiators and report on it before you make this
antenna or start
tilting towers around ten degrees sinc the change is not worth it when
calculating total gain?

Well, there it is. I'm going to scrounge a "former" and a "sowing"
needle and get right to work.

Dave K8MN


Don't forget an 'apon'....

Dave WD9BDZ

Antenna physical size
 

David G. Nagel wrote:
Dave Heil wrote:

Well, there it is. I'm going to scrounge a "former" and a "sowing"
needle and get right to work.

Dave K8MN


Don't forget an 'apon'....


Can you guys tell us the correct way to spell coil former? It's a
bobbin made of insulating material upon which wire is wound. Here's one
that got a patent:

http://www.patentstorm.us/patents/6262650.html


- 73 de Mike N3LI -

Antenna physical size
 

Michael Coslo wrote:
David G. Nagel wrote:
Dave Heil wrote:

Well, there it is. I'm going to scrounge a "former" and a "sowing"
needle and get right to work.

Dave K8MN


Don't forget an 'apon'....


Can you guys tell us the correct way to spell coil former? It's a
bobbin made of insulating material upon which wire is wound. Here's one
that got a patent:

http://www.patentstorm.us/patents/6262650.html

You've done well, Mike. Now what is a "sowing needle" and what might an
"apon" be?

Dave K8MN
the product of an inferior American education
(at least according to Art Unwin)

Antenna physical size
 

Michael Coslo wrote:
David G. Nagel wrote:
Dave Heil wrote:

Well, there it is. I'm going to scrounge a "former" and a "sowing"
needle and get right to work.

Dave K8MN
Don't forget an 'apon'....


Can you guys tell us the correct way to spell coil former? It's
a bobbin made of insulating material upon which wire is wound.

Alternatively, wind the wire onto a mandrill.


--

73 from Ian GM3SEK 'In Practice' columnist for RadCom (RSGB)
http://www.ifwtech.co.uk/g3sek

Antenna physical size
 

Mike Coslo wrote:
On Fri, 14 Mar 2008 11:57:41 -0700, Roy Lewallen wrote:

Richard Harrison wrote:
Build a small scale model that can be tested indoors and report its
characteristics. Antennas are scaleable.
That's more easily said than done. One of the critical characteristics
of a small antenna is loss. And to correctly replicate loss in a scaled
antenna requires scaling the conductivity of the conductors as the
square root of the frequency. To scale to a higher frequency requires
that the conductivity be better than the original. Unless the original
is made from lead and the scale factor moderate, this wouldn't be
possible.

If what I suspect is true, would not the coax also need to be scaled?

Dunno. What do you suspect?

Roy Lewallen, W7EL

Antenna physical size
 

Ian White GM3SEK wrote in
:

Alternatively, wind the wire onto a mandrill.

Or would that be a mandrel?

Owen

Antenna physical size
 

Michael Coslo wrote:

Can you guys tell us the correct way to spell coil former? It's a
bobbin made of insulating material upon which wire is wound. Here's one
that got a patent:

http://www.patentstorm.us/patents/6262650.html


"Former" is simply the British English equivalent to "coil form" in U.S.
English.

Roy Lewallen, W7EL

Antenna physical size
 

Owen Duffy wrote:
Ian White GM3SEK wrote in
:

Alternatively, wind the wire onto a mandrill.

Or would that be a mandrel?


I've seen both spellings recommended in print, but winding wire onto a
mandrill will be far more entertaining.


--

73 from Ian GM3SEK 'In Practice' columnist for RadCom (RSGB)
http://www.ifwtech.co.uk/g3sek