Jimmie D wrote:

"James" wrote in message
. ..

Dave, as stated in my OP, this is a 5/8 wave antenna. It is the antenna
that I have bought and that I will use temporarily. This will be for a
very
temporary use, and I agree with your suggestion about a marine 1/2 wave,
which I will do later on.

My question is "about" how much to trim for 156 mhz use. I will use an
SWR meter to get it right on spot, but I would like a feel for how much
to
trim. It is tricky to calculate , even using the "468" formula,
because of it being base-loaded.

73 de Jim K4PYT




Triming alone want do it, the base is designed to match the 5/8 2m to 50
ohms. Unless you can also figure out a way to modify the matching network
you cant do it.



B as in B, S as in S. It is plenty close enough to work just fine with
a little trimming.

And B means Bull, and S means ****.

tom
K0TAR

"Tom Ring" wrote in message
. ..
Jimmie D wrote:

"James" wrote in message
. ..

Dave, as stated in my OP, this is a 5/8 wave antenna. It is the
antenna
that I have bought and that I will use temporarily. This will be for a
very
temporary use, and I agree with your suggestion about a marine 1/2 wave,
which I will do later on.

My question is "about" how much to trim for 156 mhz use. I will use an
SWR meter to get it right on spot, but I would like a feel for how much
to
trim. It is tricky to calculate , even using the "468" formula,
because of it being base-loaded.

73 de Jim K4PYT




Triming alone want do it, the base is designed to match the 5/8 2m to 50
ohms. Unless you can also figure out a way to modify the matching network
you cant do it.

B as in B, S as in S. It is plenty close enough to work just fine with a
little trimming.

And B means Bull, and S means ****.

tom
K0TAR



No need for the vulgarities but you are correct, it will probably work.
Sorry didnt mean to bring out any hostility.

Jimmie

"Jimmie D" wrote in message
...

"Tom Ring" wrote in message
. ..
Jimmie D wrote:

"James" wrote in message
. ..

Dave, as stated in my OP, this is a 5/8 wave antenna. It is the
antenna
that I have bought and that I will use temporarily. This will be for a
very
temporary use, and I agree with your suggestion about a marine 1/2 wave,
which I will do later on.

My question is "about" how much to trim for 156 mhz use. I will use
an
SWR meter to get it right on spot, but I would like a feel for how much
to
trim. It is tricky to calculate , even using the "468" formula,
because of it being base-loaded.

73 de Jim K4PYT




Triming alone want do it, the base is designed to match the 5/8 2m to 50
ohms. Unless you can also figure out a way to modify the matching
network you cant do it.

B as in B, S as in S. It is plenty close enough to work just fine with a
little trimming.

And B means Bull, and S means ****.

tom
K0TAR



No need for the vulgarities but you are correct, it will probably work.
Sorry didnt mean to bring out any hostility.

Jimmie


Anyway, I was kind of thinking keeping it as a 5/8th's, I guess I am guilty
of having a one track mind. I agree with Tom that the hamstick will probably
resonate but cut somewhat shorter than a 5/8ths to make up for the extra
wire the 2 meter matching coil has. You will probably wind up with a 9/16ths
antenna |. If memory serves the hamstick does not use a tapped coil
matching network, just a series coil. I have tried cutting one of tapped
coil types for 153Mhz and was barely able to get it to work at with an
acceptable SWR, good luck

Jimmie

Jimmie D wrote:
I agree with Tom that the hamstick will probably
resonate but cut somewhat shorter than a 5/8ths to make up for the extra
wire the 2 meter matching coil has.

Hamsticks usually have an adjustable stinger. Can
the stinger be adjusted from longest to shortest
and those two resonant frequencies be measured?
Is this the 9007 "Mobile Colinear Antenna" from
Lakeview? They don't say it is 5/8WL.
--
73, Cecil http://www.w5dxp.com

No, Cecil, this is NOT the collinear. It is a loaded, 5/8 wave. It
is the 9002.

What is a stinger ? Are you referring to the stainless steel whip ?


73 de Jim K4PYT

James wrote:
No, Cecil, this is NOT the collinear. It is a loaded, 5/8 wave. It
is the 9002.

Sorry, that one is not shown in the Worldradio
advertisement so I didn't know what it looked like.

What is a stinger ? Are you referring to the stainless steel whip ?

Yes, the Lakeview web page says the 5/8WL is "Tunable
for other frequencies". My suggestion is to tune it
to the lowest frequency and measure that frequency.
Then tune it to the highest frequency and measure
that frequency. That should give enough information
to raise its resonant frequency by 7%.
--
73, Cecil http://www.w5dxp.com

Pretty good idea Cecil. Thanks !!

73 de Jim K4PYT