[TowerTalk] Back of desk grounding buss

[Jim Brown]

That experience counts for lightning protection of commercial 
installations with big budgets, setups that don't change, no local 
analog audio, and in a broadcast environment, balanced audio. But that's 
not most ham stations. We have limited budgets, we do everything 
ourselves, we change our setups as we try new things, buy new gear, have 
lots of stuff interconnected, like computers, rigs, amps, audio 
processors, SO2R boxes, and all of the interconnections are UNbalanced.  
Moreover, if it's FM broadcast, cellular, or VHF/UHF 2-way, most of 
those antennas are high in the air and have nulls in the direction of 
the equipment, whereas our antennas often produce significant field 
strength in our shacks.

Those interconnections, especially analog audio, is one big reason why 
chassis-to-chassis bonding is far better than running individual wires 
to a common point (or bus bar).

And there is nothing about that chassis-to-chassis bonding that is less 
good than individual wires to a common point. Remember that with those 
wires to a common point, we still have a loop to create magnetic 
coupling -- it's formed by the interconnections between the boxes and 
those long wires to the common point.

73, Jim K9YC

On 3/23/2014 8:44 AM, Jim Lux wrote:
> Your experience is probably more relevant.  Especially with reference to commercial practice.
>
> My thing is more about the theory behind the recommendations, which is often buried in the mists of history.  Sort of like 468/f
>
> On Mar 23, 2014, at 3:53, n4zkf<towertalk at n4zkf.com>  wrote:
>
>> >I didn't put a rover on mars but I do grounding on cell and broadcast
>> >sites for a living working in telecom. Does that count?
>> >