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Re: [TenTec] Orion 2

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Orion 2
From: Robert & Linda McGraw K4TAX <RMcGraw@Blomand.Net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sat, 19 Nov 2005 11:47:33 -0600
List-post: <mailto:tentec@contesting.com>
I understand the 8 pin connector is like some of the other current rigs that 
use this connector.  Best wait for the final technical info however.

Sorry to hear about the failure of your Orion due to lightning.  As to a 
lightning strike system that is fool proof.........well factually there is 
no such critter.  It would take a conductor the size of a truck to handle 
the current of a single direct stroke.

Now with that said, it would appear that system grounding at the station is 
the fault for allowing such an event and damage to take place.  Ok, so you 
did disconnect the antenna from the radio.  That's good.  But to the point, 
this is not adequate in most situations.  The largest fault and general 
oversight lies in the system where one has a ground for their tower/antenna 
and a ground for the AC mains {as required by code}.  Most likely with this 
condition one has an excellent path for lightning damage during a nearby 
strike as the two grounds will be at different voltage potentials.  One must 
accept the fact that any two points on the earth, regardless of spacing 10 
ft or 100 ft or 1000 ft, will have some value of resistance.  The radio and 
power supply usually have been found to be connected to what some call 
"radio ground" and also AC mains ground via the power supply and 3rd pin AC 
ground and or neutral.  Your antenna is not your problem.  Solution:  The 
radio ground and the AC mains ground must be connected or bonded together 
outside of the house. I use a piece of 1/2" soft copper water line, trenched 
in only 2 or 3 inches around the foundation to connect the two grounds which 
are some 60 ft apart.  Now some folks will argue that in doing this it will 
bring lightning into the house via the wiring. Well this is exactly what 
happened in an unbonded condition and most likely this is what damaged your 
radio.

Look at your grounding system very carefully.  I'll bet you the price of a 
new Orion II that you'll find fault with your ground system.  And to that 
end, the generic application of "more grounds" is not the solution.  Correct 
grounds is the proper solution.  The rule:  all grounds on the property must 
be bonded together to provide a low resistance between the ground points. 
Failure to do this will result in a "step voltage" between grounds and any 
equipment connected to these grounds will become the path of lowest 
resistance and maximum smoke.

73
Bob, K4TAX

----- Original Message ----- 
From: "Stephen M Shearer" <wb3lgc@verizon.net>
To: "'Discussion of Ten-Tec Equipment'" <tentec@contesting.com>
Sent: Saturday, November 19, 2005 10:14 AM
Subject: Re: [TenTec] Orion 2


> It would be nice if TT would publish the 8 pin mike connector diagram.
>
> While I wait for my O2, I could remake my mike cable from my O1 (dead 
> since
> the end of July when lightning took its life).  I don't expect the 
> connector
> to change as the debugging moves forward.
>
> Btw: New Lightning Rule #1;  A well grounded rig will provide a path for
> lightning even if the antenna coax is disconnected from (and separated 
> from)
> the radio.
>
> 73, Steve WB3LGC


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