Trimming 2m 5/8 wave antenna for 156 mhz ???
 

After reading all of this thread I came up with a thought.
use it as it is and see if it works satisfactorily.
if not make a coax stub and connect with a "T" adapter and trim that for
optimal performance.

Henry

"James" wrote in message
. ..
Hello ! I just bought a 2m Hamstick antenna at the Orlando Hamfest, the
model 9100. I would like to trim this antenna for 156 mhz, for marine
use on my boat. Can someone tell me "about" how much I should shorten
the
whip to achieve this ? Remember, this is the 5/8 wave antenna with a
loaded
base.

Thank you very much !!


73 de Jim K4PYT

Trimming 2m 5/8 wave antenna for 156 mhz ???
 

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

Trimming 2m 5/8 wave antenna for 156 mhz ???
 

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

Trimming 2m 5/8 wave antenna for 156 mhz ???
 

Pretty good idea Cecil. Thanks !!

73 de Jim K4PYT

Trimming 2m 5/8 wave antenna for 156 mhz ???
 

"John Doe" wrote in message
...
Start trimming by 1/4 " at a time.



Yep...that's what I'd do

and when the SWR gets down to some reasonable level

stop trimming!

Trimming 2m 5/8 wave antenna for 156 mhz ???
 

On Feb 17, 12:41 pm, "James" wrote:
Hello ! I just bought a 2m Hamstick antenna at the Orlando Hamfest, the
model 9100. I would like to trim this antenna for 156 mhz, for marine
use on my boat. Can someone tell me "about" how much I should shorten the
whip to achieve this ? Remember, this is the 5/8 wave antenna with a loaded
base.

Thank you very much !!

73 de Jim K4PYT

5/8 wave on 156 MHz is 47.3 inches (rounding). Seems like whipping up
one of the classic SO-239 connector ground plane antennas out of some
brazing rods would be a super cheap way to do it, then you don't have
to worry about counterpoise and you haven't taken more than about $10
out of the antenna fund.

Jon
KC2PNF