[CQ-Contest] Bravo - CQ

Pete Smith N4ZR n4zr at contesting.com
Thu Jun 25 21:15:05 EDT 2015

Begging your pardon, but I'm not confused, Jim.  Such bonding may be 
required in your locality, but here, in older houses, everything back to 
2-wire knob and tube is permitted. Moreover, the size of the bonding 
conductors often does not meet your specifications (you see, I did read 
the presentation).

I acknowledge that the other topic, bonding within the station, is a 
different matter.  I've done a lot of that to solve AC hum issues, in 
particular. The only point I was trying to make is that sometimes the 
best can be the enemy of the good, and if a couple of isolation 
transformers are an alternative to solving all of the pin one problems 
you point out in modern station equipment, that may make sense.

73, Pete N4ZR
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On 6/25/2015 5:08 PM, Jim Brown wrote:
> On Thu,6/25/2015 1:25 PM, Pete Smith N4ZR wrote:
>> But... many of us live in older houses, with iffy wiring and long 
>> distances among entrances of various services, making the sort of 
>> bonding you call for a major undertaking. 
> Hi Pete,
> You're confused between bonding within the station and bonding for 
> lightning safety as required by Electrical building codes. The bonding 
> between grounded objects and entrances of wiring is REQUIRED BY LAW. I 
> had exactly such an old house in Chicago.  Our shack "ground" MUST, BY 
> LAW, be bonded to those grounds. To not do it is unsafe. The minimum 
> requirement is via the Green wire in the AC power system. Better (for 
> lightning safety) to run a perimeter ground to connect those separated 
> grounds .
>> By comparison, a couple of 5-buck isolation transformers make a lot 
>> of sense for the particular purpose Ed described. 
> Power distribution and bonding inside the shack is what eliminates the 
> need for audio transformers.
> 73, Jim K9YC
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