[TenTec] [Fwd: Line Isolator Balun (sorta) question.]

[John Chance-Read]

I won't go into the technical aspects of your query - cos I don't know nothink 
!.
BUT I tried what you proposed following problems with both my rigs ATU an 
expensive Sig Gen, my SWR Meter and a brand new monitor.  Monitor, Sig Gen and 
one of my rig went US.   I continued to have problem (though not as much) after 
I fitted all of your suggestions.
In the end I found that pointing the end of my dipole directly at the Shack 
stopped the lot.  It was the radiated signal that was doing the damage.  
John 




________________________________
From: Jim Lowman <jmlowman at sbcglobal.net>
To: tentec at contesting.com
Sent: Fri, 6 August, 2010 4:38:14
Subject: [TenTec] [Fwd: Line Isolator Balun (sorta) question.]

Background -

QST Magazine, and various commercial entities, tout the benefits of a 
1:1 line-isolation balun - sometimes simply made by slipping a number of 
ferrite beads over the coax feed lime. and securing them with heat 
shrink tubing.  (e.g., Palomar Engineers, BuxCom, and other vendors 
sell these as an inexpensive kit.)

Several articles and commercial vendors suggest using line isolation 
baluns ( which are often made of ferrite beads)  on  feed lines in the 
shack - including the short jumper cables running between rig and amp, 
and between amp and tuner,  and so forth.

Questions -

1)  What if I put those ferrite beads on ALL my coax jumper cables as 
they run between rig and amp and tuner ?  Any downside to this ?

2)  What if I installed those beads on outside coax cables, at the feed 
point, as suggested in the many articles I have read.  Any downside to 
this ?

3)  What if I do both  1)  and  2)...  and install them all over the 
place ?

              THANKS in advance for your insight.

======================  James - K8JHR  ========================



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