I'm building a turnstile in the 1GHz range. The length of the coax
for the 90* phasing loop is too short to work with easily. Would I
get the same results using a phasing loop 270* in length?

Ralph

wrote in message
...
I'm building a turnstile in the 1GHz range. The length of the coax
for the 90* phasing loop is too short to work with easily. Would I
get the same results using a phasing loop 270* in length?

Ralph

Yes, I am curious, what are you using to verify that your harness has the
proper delay. At these frequencies I would want a vector voltmeter or
network analyzer to check.

Jimmie

yes, but it will rotate the opposite way.

wrote in message
...
I'm building a turnstile in the 1GHz range. The length of the coax
for the 90* phasing loop is too short to work with easily. Would I
get the same results using a phasing loop 270* in length?

Ralph

wrote in message
...
I'm building a turnstile in the 1GHz range. The length of the coax
for the 90* phasing loop is too short to work with easily. Would I
get the same results using a phasing loop 270* in length?

Ralph

Hi Ralph

Could you consider constructing your Turnstile so the "phasing loop" is a
straight length of coax, about 2 inches long seperating the two (crossed)
dipoles?

Jerry

On Sun, 17 Jun 2007 17:08:58 GMT, "Jerry Martes"
wrote:


wrote in message
.. .
I'm building a turnstile in the 1GHz range. The length of the coax
for the 90* phasing loop is too short to work with easily. Would I
get the same results using a phasing loop 270* in length?

Ralph

Hi Ralph

Could you consider constructing your Turnstile so the "phasing loop" is a
straight length of coax, about 2 inches long seperating the two (crossed)
dipoles?
Jerry


I figured 1.8 inches for 1066 MHz. I wanted to build it into a pvc
pipe cap so there isn't much room to work. Also, am I correct to
assume the 1.8 is the total length, including what is stripped back to
make the connection?
Ralph

wrote in message
...

On Sun, 17 Jun 2007 17:08:58 GMT, "Jerry Martes"
wrote:


wrote in message
. ..
I'm building a turnstile in the 1GHz range. The length of the coax
for the 90* phasing loop is too short to work with easily. Would I
get the same results using a phasing loop 270* in length?

Ralph

Hi Ralph

Could you consider constructing your Turnstile so the "phasing loop" is
a
straight length of coax, about 2 inches long seperating the two (crossed)
dipoles?
Jerry


I figured 1.8 inches for 1066 MHz. I wanted to build it into a pvc
pipe cap so there isn't much room to work. Also, am I correct to
assume the 1.8 is the total length, including what is stripped back to
make the connection?
Ralph


Hi Ralph

I dont know what your needs are for this Turnstile antenna, so my input
may be of no value. But, a Turnstile can be made to work by feeding both
dipoles with one feed point. No phasing harness is needed. Make one
dipole a little short so it is capacitive and the other dipole a little long
so it is inducvtive.

Jerry

On Jun 17, 12:47 pm, "Jerry Martes" wrote:


I figured 1.8 inches for 1066 MHz. I wanted to build it into a pvc
pipe cap so there isn't much room to work. Also, am I correct to
assume the 1.8 is the total length, including what is stripped back to
make the connection?
Ralph

Hi Ralph

I dont know what your needs are for this Turnstile antenna, so my input
may be of no value. But, a Turnstile can be made to work by feeding both
dipoles with one feed point. No phasing harness is needed. Make one
dipole a little short so it is capacitive and the other dipole a little long
so it is inducvtive.

Jerry

The only problem with that is the antenna will still have basically a
dipole
pattern. I assume he is wanting the usual omni pattern with circular
polarization at the higher angles..
But maybe not... You need the phase line if you want a true omni
"turnstile"
pattern.
But saying that , I have used turnstiles with no line.. But usually on
80m..
And it does change the pattern a bit from the original single dipole,
but not
quite the same as using a phase line.
MK

wrote in message
oups.com...
On Jun 17, 12:47 pm, "Jerry Martes" wrote:


I figured 1.8 inches for 1066 MHz. I wanted to build it into a pvc
pipe cap so there isn't much room to work. Also, am I correct to
assume the 1.8 is the total length, including what is stripped back to
make the connection?
Ralph

Hi Ralph

I dont know what your needs are for this Turnstile antenna, so my input
may be of no value. But, a Turnstile can be made to work by feeding
both
dipoles with one feed point. No phasing harness is needed. Make one
dipole a little short so it is capacitive and the other dipole a little
long
so it is inducvtive.

Jerry

The only problem with that is the antenna will still have basically a
dipole
pattern. I assume he is wanting the usual omni pattern with circular
polarization at the higher angles..
But maybe not... You need the phase line if you want a true omni
"turnstile"
pattern.
But saying that , I have used turnstiles with no line.. But usually on
80m..
And it does change the pattern a bit from the original single dipole,
but not
quite the same as using a phase line.
MK


Hi MK

I may have screwed up, but I think that a pair of dipoles on the same
plane, configured like a pair of non-symetrical Vs could be fed with one
feed point to produce a free space cardiod pattern. That would be one
short dipole and one one longer dipole fed in parallel.

Jerry




Jerry