The AM Forum
May 08, 2024, 05:39:51 PM *
Welcome, Guest. Please login or register.

Login with username, password and session length
 
   Home   Help Calendar Links Staff List Gallery Login Register  
Pages: [1]   Go Down
« previous next »
  Print  
Author Topic: Dipole Question  (Read 5923 times)
0 Members and 1 Guest are viewing this topic.
KE5YTV
Contributing
Member
*
Offline Offline

Posts: 351
« on: November 16, 2014, 12:23:11 AM »
I'm putting up a inverted V dipole at my home. The center will be at 40' sloping down to 8' at the ends. My problem is that one leg will pass over a concrete parking area. My question is, how will the concrete affect the antenna performance?  Huh

Mike
Logged
Mike
KE5YTV  Dallas, TX
"The longest trip begins with a stop at the ATM."
KX5JT
Contributing
Member
*
Offline Offline

Posts: 1948


John-O-Phonic
« Reply #1 on: November 16, 2014, 04:09:53 AM »
Concrete is simply an insulating (non-conductive) material sitting on top of ground, I think it will be very minimal.  Just make sure it's high enough that vehicles can't take it down.
Logged
AMI#1684
KD6VXI
Contributing
Member
*
Offline Offline

Posts: 2656


Making AM GREAT Again!
« Reply #2 on: November 16, 2014, 12:04:58 PM »
Concrete is not an insulator.

Try grabbing a 120 vac leg while standing barefoot on that wonderful insulator.

Hopefully you'll still be alive to report back on your findings.

Search UFER  grounding for more info.

Bad piece if information here.

--Shane
KD6VXI
Logged
KC2ZFA
Member

Offline Offline

Posts: 438
« Reply #3 on: November 16, 2014, 12:58:07 PM »
detailed info here: http://www.iotpe.com/IJTPE/IJTPE-2013/IJTPE-Issue16-Vol5-No3-Sep2013/14-IJTPE-Issue16-Vol5-No3-Sep2013-pp96-101.pdf
Logged
Steve - K4HX
Administrator
Member

Offline Offline

Posts: 2720
« Reply #4 on: November 16, 2014, 02:51:05 PM »
Unless the area covered by the concrete is exceptionally large, the effect will be just about zero. In other words, don't worry about it.
Logged
aa5wg
Member

Offline Offline

Posts: 435
« Reply #5 on: November 16, 2014, 08:17:06 PM »
I agree with Steve.  The effective result will be minimal.  There could be steel re rod inside the concrete.
However, from experience this had a zilch effect on my antennas.

73,
Chuck
Logged
Pete, WA2CWA
Moderator
Member

Offline Offline

Posts: 8080


CQ CQ CONTEST


WWW
« Reply #6 on: November 16, 2014, 10:17:02 PM »
Quote from: KE5YTV on November 16, 2014, 12:23:11 AM
I'm putting up a inverted V dipole at my home. The center will be at 40' sloping down to 8' at the ends. My problem is that one leg will pass over a concrete parking area. My question is, how will the concrete affect the antenna performance?  Huh

Mike

I might only be a problem if you park a tall truck in the parking area.
Logged
Pete, WA2CWA - "A Cluttered Desk is a Sign of Genius"
KX5JT
Contributing
Member
*
Offline Offline

Posts: 1948


John-O-Phonic
« Reply #7 on: November 17, 2014, 05:33:21 AM »
I stand corrected then... it's not an insulator... hmmm... well... at least the idea of it not being very significant to a dipole above it holds.
Logged
AMI#1684
KE5YTV
Contributing
Member
*
Offline Offline

Posts: 351
« Reply #8 on: November 17, 2014, 11:27:20 AM »
Thanks guys! I was afraid that the antenna performance was really going to be compromised. So now, it's full speed ahead.

Mike
Logged
Mike
KE5YTV  Dallas, TX
"The longest trip begins with a stop at the ATM."
flintstone mop
Contributing
Member
*
Offline Offline

Posts: 5047
« Reply #9 on: November 17, 2014, 03:01:51 PM »
What bands are you trying to use?
Inverted Vees are very good antennas for those who cannot have a true flat top dipole.
Are you planning to use a remote tuner? or are you going to find a sweet spot?
Fred
Logged
Fred KC4MOP
KE5YTV
Contributing
Member
*
Offline Offline

Posts: 351
« Reply #10 on: November 17, 2014, 05:28:22 PM »
Hi Fred,

80-15 meters with a tuner.

Mike
Logged
Mike
KE5YTV  Dallas, TX
"The longest trip begins with a stop at the ATM."
Pages: [1]   Go Up
  Print  
The AM Forum  > THE AM BULLETIN BOARD > Technical Forum > Topic: Dipole Question
 « previous next »
 
Jump to:  

AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
 AMfone © 2001-2015
Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Page created in 0.072 seconds with 19 queries.