Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
Strays
Survey Question

Operating
Contesting
DX Cluster Spots
Propagation

Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net

donate to eham
   Home   Help Search  
Pages: [1]   Go Down
  Print  
Author Topic: HamStick whip shortening question  (Read 877 times)
KF7ZFC
Member

Posts: 121




Ignore
« on: November 04, 2017, 12:19:18 PM »

I have used #8 solid copper wire to find the resonant points on 40m, 20m and 17m HamSticks. Using my antenna analyzer I cut a little bit at a time to arrive at resonance/low SWR.

Originally I had lowered the stainless steel whips but that caused the resonant frequencies to lower due to the whip now in the coil area. The copper wire I kept short just so it cleared the clamp collar it's in.

The whip diameter is slightly larger than the copper wire.

My question is when I cut the stainless whip shorter should I leave a longer length than what I cut the copper wire to?
Logged
K3LI
Member

Posts: 46




Ignore
« Reply #1 on: November 04, 2017, 12:57:14 PM »

I would think they should be close to the same length.  There may be a small difference due to the corona ball on the end of the SS whip.  Personally, I would cut them a minimum of 1/4 to 3/8 longer than the copper and work them down.
Logged
WB6BYU
Member

Posts: 17179




Ignore
« Reply #2 on: November 04, 2017, 03:45:20 PM »

I'd leave a little extra, just in case...

You should be able to slide the whip down at least an inch or so before it starts protruding into the coil.
and that much adjustment may come in handy (particularly for the 40m whip, which likely will have
sharper tuning than the others.)  You should be able to feel where the winding stops under the heat
shrink tubing on the outside of the antenna - that's the lower limit.  The actual tuning will depend on
your ground system and nearby objects, so it is helpful to leave room for adjustment as things change
in the future.
Logged
KF7ZFC
Member

Posts: 121




Ignore
« Reply #3 on: November 04, 2017, 06:42:20 PM »

Thanks
Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!