Hi Kids:

I need to build an antenna mount for a motorcycle, and the antenna has
to stand up vertically for use, then fold down horizontally for
storage. Currently using a RAM ball mount, but the RAM isn't strong
enough to hold up in wind. Hence the need for a "rosette" joint.

I may be calling this thing the wrong name, so let me explain: What I'm
looking for is round, somewhere near 2-3" in diameter, is a two piece
design and is held together by a bolt through the center, kinda like
bolting two cookies together. Remove the bolt, separate the two halves
and you see what look like "saw" teeth, that mate up with each other
when bolted together. You loosen the bolt and "ratchet" the thing
around to where you need it, then tighten the bolt. You see these on
adjustable handlebars for motorcycles, some types of adjustable ladders
and scaffolding...things that bear a lot of weight but need to swivel.

Any steerage to the right direction would greatly appreciated.
Ronnie Lyons
Meridian, ID

"Ronnie" wrote in message oups.com...
I need to build an antenna mount for a motorcycle, and the antenna has
to stand up vertically for use, then fold down horizontally for
storage. Currently using a RAM ball mount, but the RAM isn't strong
enough to hold up in wind. Hence the need for a "rosette" joint.

I may be calling this thing the wrong name, so let me explain: What I'm
looking for is round, somewhere near 2-3" in diameter, is a two piece
design and is held together by a bolt through the center, kinda like
bolting two cookies together. Remove the bolt, separate the two halves
and you see what look like "saw" teeth, that mate up with each other
when bolted together. You loosen the bolt and "ratchet" the thing
around to where you need it, then tighten the bolt. You see these on
adjustable handlebars for motorcycles, some types of adjustable ladders
and scaffolding...things that bear a lot of weight but need to swivel.
Any steerage to the right direction would greatly appreciated.
Ronnie Lyons

Sounds like the sort of adjustable clamp you find under every bicycle seat.

Awning shop, Yacht if you want stainless

Hi Kids:

I need to build an antenna mount for a motorcycle, and the antenna has
to stand up vertically for use, then fold down horizontally for
storage. Currently using a RAM ball mount, but the RAM isn't strong
enough to hold up in wind. Hence the need for a "rosette" joint.

I may be calling this thing the wrong name, so let me explain: What I'm
looking for is round, somewhere near 2-3" in diameter, is a two piece
design and is held together by a bolt through the center, kinda like
bolting two cookies together. Remove the bolt, separate the two halves
and you see what look like "saw" teeth, that mate up with each other
when bolted together. You loosen the bolt and "ratchet" the thing
around to where you need it, then tighten the bolt. You see these on
adjustable handlebars for motorcycles, some types of adjustable ladders
and scaffolding...things that bear a lot of weight but need to swivel.

Any steerage to the right direction would greatly appreciated.
Ronnie Lyons
Meridian, ID


I used to run a Ham Radio setup on a BMW motorcycle and got around this
problem by having a fixed bracket that came out from under the rear of
the seat (attached to the bike frame to provide a suitable 'ground
plane') and a folding 'joint' in the antenna itself.

A lot of mobile Ham Radio antennas have built in 'joints' to allow you
to drop the antenna when driving vehicles into low roof areas like
parking garages. They 'normally' consist of a vertical 'slit' fitting
and a collar that is spring loaded and can be screwed down to the base
when in the vertical position. To drop the antenna you unscrew and lift
the collar and the antenna will then fold into the horizontal position.
To revert to vertical use simply lift the antenna and once vertical the
sprung collar 'pops' down over the base fitting and and you can tighten
it down. I have used these types of antennas on motorcycles and cars at
speeds up to 100 MPH and never had a problem with the 'joints'.

Do you need a basic 'receiving' antenna or do you need to transmit on it
too? If it is just going to be used for receiving almost any antenna
will do but if you intend to transmit then the antenna will have to be
'tuned' to the required frequency band.


--
Larry Green
VE3YET (ex G1YET)

Ronnie wrote:
Hi Kids:

I need to build an antenna mount for a motorcycle, and the antenna has
to stand up vertically for use, then fold down horizontally for
storage. Currently using a RAM ball mount, but the RAM isn't strong
enough to hold up in wind. Hence the need for a "rosette" joint.

I may be calling this thing the wrong name, so let me explain: What I'm
looking for is round, somewhere near 2-3" in diameter, is a two piece
design and is held together by a bolt through the center, kinda like
bolting two cookies together. Remove the bolt, separate the two halves
and you see what look like "saw" teeth, that mate up with each other
when bolted together. You loosen the bolt and "ratchet" the thing
around to where you need it, then tighten the bolt. You see these on
adjustable handlebars for motorcycles, some types of adjustable ladders
and scaffolding...things that bear a lot of weight but need to swivel.

Any steerage to the right direction would greatly appreciated.
Ronnie Lyons
Meridian, ID


Something like checkers, you mean.
Mower handles, our Dr. Trimmer has them but they are plastic--pretty
sturdy, though.

Ken Grunke

--
take da "ma" offa dot com fer eemayl

Technical name is Hirth coupling or "face gear".
for the "high priced spread" see
http://www.transconn.com/components/hirth/index.htm
http://www.exactmachinery.com/9HIRTH_cfm.htm
and about 6,700 more places.

I came first came across one of these when I worked on an old
German motorcycle with a multi piece crankshaft.

Must be a nightmare to machine.

GmcD


On 21 Jan 2005 10:52:03 -0800, "Ronnie"
wrote:
snip
Hence the need for a "rosette" joint.
I may be calling this thing the wrong name, so let me explain: What I'm
looking for is round, somewhere near 2-3" in diameter, is a two piece
design and is held together by a bolt through the center, kinda like
bolting two cookies together. Remove the bolt, separate the two halves
and you see what look like "saw" teeth, that mate up with each other
when bolted together. You loosen the bolt and "ratchet" the thing
around to where you need it, then tighten the bolt. You see these on
adjustable handlebars for motorcycles, some types of adjustable ladders
and scaffolding...things that bear a lot of weight but need to swivel.
snip

On 21 Jan 2005 10:52:03 -0800, "Ronnie" wrote:

Hi Kids:

I need to build an antenna mount for a motorcycle, and the antenna has
to stand up vertically for use, then fold down horizontally for
storage. Currently using a RAM ball mount, but the RAM isn't strong
enough to hold up in wind. Hence the need for a "rosette" joint.

I may be calling this thing the wrong name, so let me explain: What I'm
looking for is round, somewhere near 2-3" in diameter, is a two piece
design and is held together by a bolt through the center, kinda like
bolting two cookies together. Remove the bolt, separate the two halves
and you see what look like "saw" teeth, that mate up with each other
when bolted together. You loosen the bolt and "ratchet" the thing
around to where you need it, then tighten the bolt. You see these on
adjustable handlebars for motorcycles, some types of adjustable ladders
and scaffolding...things that bear a lot of weight but need to swivel.

Any steerage to the right direction would greatly appreciated.
Ronnie Lyons
Meridian, ID

LORAN antenna mount. Marine supply place might have 'em.

Ronnie wrote:

Hi Kids:

I need to build an antenna mount for a motorcycle, and the antenna has
to stand up vertically for use, then fold down horizontally for
storage. Currently using a RAM ball mount, but the RAM isn't strong
enough to hold up in wind. Hence the need for a "rosette" joint.

I may be calling this thing the wrong name, so let me explain: What I'm
looking for is round, somewhere near 2-3" in diameter, is a two piece
design and is held together by a bolt through the center, kinda like
bolting two cookies together. Remove the bolt, separate the two halves
and you see what look like "saw" teeth, that mate up with each other
when bolted together. You loosen the bolt and "ratchet" the thing
around to where you need it, then tighten the bolt. You see these on
adjustable handlebars for motorcycles, some types of adjustable ladders
and scaffolding...things that bear a lot of weight but need to swivel.

Any steerage to the right direction would greatly appreciated.
Ronnie Lyons
Meridian, ID


Get thee to a Guitar Center or other purveyor of imported music gear. Go
into the drum shop and look at their mounting clamps. They have lots and
lots of clamps which have to be rigid and never rust and are cheap. I have
a particular one in my drum parts drawer which I was given which has 2 of
those round ratchety angle-adjust things so you can adjust something at
two angles. I've seen the exact one I have but I don't know what it's called
either. - GWE

Ronnie wrote:

Hi Kids:

I need to build an antenna mount for a motorcycle, and the antenna has
to stand up vertically for use, then fold down horizontally for
storage. Currently using a RAM ball mount, but the RAM isn't strong
enough to hold up in wind. Hence the need for a "rosette" joint.

I may be calling this thing the wrong name, so let me explain: What I'm
looking for is round, somewhere near 2-3" in diameter, is a two piece
design and is held together by a bolt through the center, kinda like
bolting two cookies together. Remove the bolt, separate the two halves
and you see what look like "saw" teeth, that mate up with each other
when bolted together. You loosen the bolt and "ratchet" the thing
around to where you need it, then tighten the bolt. You see these on
adjustable handlebars for motorcycles, some types of adjustable ladders
and scaffolding...things that bear a lot of weight but need to swivel.

Any steerage to the right direction would greatly appreciated.
Ronnie Lyons
Meridian, ID


DW calls theirs "dogbone clamps" see http://www.dwdrums.com/clampsarms/

DW makes good stuff.

GWE

Marine VHS antenna mount. Plastic or SS.
JR
Dweller in the cellar
Ronnie wrote:

Hi Kids:

I need to build an antenna mount for a motorcycle, and the antenna has
to stand up vertically for use, then fold down horizontally for
storage. Currently using a RAM ball mount, but the RAM isn't strong
enough to hold up in wind. Hence the need for a "rosette" joint.

I may be calling this thing the wrong name, so let me explain: What I'm
looking for is round, somewhere near 2-3" in diameter, is a two piece
design and is held together by a bolt through the center, kinda like
bolting two cookies together. Remove the bolt, separate the two halves
and you see what look like "saw" teeth, that mate up with each other
when bolted together. You loosen the bolt and "ratchet" the thing
around to where you need it, then tighten the bolt. You see these on
adjustable handlebars for motorcycles, some types of adjustable ladders
and scaffolding...things that bear a lot of weight but need to swivel.

Any steerage to the right direction would greatly appreciated.
Ronnie Lyons
Meridian, ID

Thanks for the great replies, you've stirred the juices of creativity
!!

Ronnie

Thanks for the great replies, you've stirred the juices of creativity
!!

Ronnie

Thanks for the great replies, you've stirred the juices of creativity
!!

Ronnie