Grounding the Antenna or Coaxial Cable? - Canadian TV, Computing and Home Theatre Forums

 
LinkBack Thread Tools Search this Thread Display Modes

post #1 of 6 (permalink) Old 2009-09-22, 11:00 PM Thread Starter
Rookie
 
Join Date: Aug 2009
Location: Ottawa, ON
Posts: 26
Question Grounding the Antenna or Coaxial Cable?

I'm relatively new here so please pardon me if this is a n00b question.

I've got a 4221HD mounted on my balcony and the coax comes into my apartment and connected directly to my PVR.

I was fine-tuning the antenna aiming this evening and noticed something extremely odd. The back of my hand brushed lightly against one of the bowtie elements and I felt a low voltage shock. I can grab it firmly and feel nothing, but if I touch it very lightly with the back of my hand or my arm, there's definitely voltage there.

I've been shocked by 120 volt AC and this is certainly not nearly so strong. I don't know it it's AC or not, but I never expected the active antenna elements to be energized.

What's the deal here? The antenna isn't grounded, but I wouldn't have expected this to be a problem outside a lightning strike. The coax cable is a total of three metres long and the distance between the antenna and the PVR is maybe two metres. I can't figure out what's going on here.

Any ideas? Is this a serious problem?
rpali is offline  
Sponsored Links
Advertisement
 
post #2 of 6 (permalink) Old 2009-09-22, 11:32 PM
Moderator
 
Join Date: Jan 2009
Location: Kitchener, ON
Posts: 4,785
Grounding antenna equipment isn't just about preventing/limiting damage from lightning.

The metal sheath around the dialectric of coax acts as a "faraday cage"; dissapating RF and electrical energy before it interferes with the centre conductor. Static discharge and buildup (or any electrical discharge or arcing) generates noise, which will negatively impact your reception.

Antennas will build up static charge--by the wind passing through the elements.

You need to find a way to ground the antenna. It can be difficult in a condo/apartment situation, but it must be done.
Jase88 is offline  
post #3 of 6 (permalink) Old 2009-09-22, 11:42 PM Thread Starter
Rookie
 
Join Date: Aug 2009
Location: Ottawa, ON
Posts: 26
What specifically has to be grounded? The antenna or the mast to which I've mounted it to? They're both metal so I'm assuming it doesn't matter.

I'm curious though. If the antenna had picked up a static charge, the difference in potential should have equalized (between me and the antenna) fairly quickly. I detected no such change as I continued to try to feel the electricity. Very strange.
rpali is offline  
post #4 of 6 (permalink) Old 2009-09-23, 01:00 AM
Moderator
 
Join Date: Jan 2009
Location: Kitchener, ON
Posts: 4,785
Both the antenna mast and the coax need to grounded (refer to the grounding thread).

You discharged the static when you touched the antenna. However, it will build up quickly again.
Jase88 is offline  
post #5 of 6 (permalink) Old 2009-09-28, 10:48 AM
Rookie
 
Join Date: Sep 2009
Posts: 5
Exclamation Grounding the New Antenna or Coaxle Cable?

Hi guys

I just installed my exterior antenna, and i was wondering So i need to ground my ANTENNA or the COAXLE CABLE?

And how do i do it? I have been looking for the the GROUNDING THREAD but cannot find it.

Thanks.
bigbody300 is offline  
post #6 of 6 (permalink) Old 2009-09-28, 11:09 AM
Moderator
 
Join Date: Jun 2005
Location: Vancouver - OTA, Pioneer KURO Elite Signature PRO-141FD, 27" iMac, WDTV Live.
Posts: 2,781
Cyclism is offline  
Closed Thread

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Canadian TV, Computing and Home Theatre Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome