View Single Post
Old 23-Oct-2018, 1:53 PM   #10
rabbit73
Retired A/V Tech
 
Join Date: Aug 2012
Location: S.E. VA
Posts: 2,747
The code says the coax shield should be grounded using the grounding block and the mast should be grounded, each with its own separate 10 gauge copper wire connected to the house ground. Don't make a splice, use a separate split bolt for each. The split bolt is an open "U" that will surround the house ground wire when the nut for the split bolt is removed.



Quote:
Thank you for your explanation and diagram. I had used wireties to fasten the coax to the mast, so obviously I'm doing that wrong. Where can I buy the standoff described in the diagram, to extent the coax off of the mast?
The diagram is a little out of date. You can fasten the coax to the mast. Many years ago 300 ohm twin lead was used instead of coax. It had to be kept away from nearby metal objects, hence the standoff insulator. Then coax came along and coax standoffs were available for it. The insulator in the standoff was designed for coax or twin lead (slot in insulator). The metal of the standoff that surrounds the feed line insulator is not closed (it's a hook), to avoid having a shorted turn around the twin lead which would affect the signals in the twin lead.

https://www.summitsource.com/Channel...071-P9727.aspx

https://www.summitsource.com/Channel...072-P9726.aspx
Attached Images
File Type: jpg Split Bolt7_1.jpg (71.4 KB, 2420 views)
__________________
If you can not measure it, you can not improve it.
Lord Kelvin, 1883
http://www.megalithia.com/elect/aeri...ttpoorman.html

Last edited by rabbit73; 23-Oct-2018 at 2:14 PM.
rabbit73 is offline   Reply With Quote