On Thu,6/25/2015 6:15 PM, Pete Smith N4ZR wrote:
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).
That is true in many localities. The problem is that MotherNature does
not know that, nor does it know that telco or CATV wiring is installed
by workers who are members of a different union, or that those
industries havelobbied for exemptions from good engineering practice. So
if a home is poorly wired, or those well considered building code
requirements are violated,lightning damage is more likely, and more
likely to be more severe.
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,
Yes, but this is NOT an example of that principle, which I've often
preached!
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.
Bonding is a better and less expensive "band-aid" for the Pin One
Problem than transformers, and has the added advantage of making our
station safer.
73, Jim K9YC
73, Pete N4ZR
Download the new N1MM Logger+ at
<http://N1MM.hamdocs.com>. Check
out the Reverse Beacon Network at
<http://reversebeacon.net>, now
spotting RTTY activity worldwide.
For spots, please use your favorite
"retail" DX cluster.
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
_______________________________________________
CQ-Contest mailing list
CQ-Contest@contesting.com
http://lists.contesting.com/mailman/listinfo/cq-contest
_______________________________________________
CQ-Contest mailing list
CQ-Contest@contesting.com
http://lists.contesting.com/mailman/listinfo/cq-contest
|