[Amps] Amp causing RFI

[John Simmons]

I recommend you read the ARRL book 'Grounding and bonding'. I also 
highly recommend you connect to ground rods with exothermic welding.

-de John NI0K

Richard Solomon wrote on 2/4/2020 10:20 AM:
> I agree with Glen. In my case a well
> working system all of a sudden became
> "wonky". RF Feedback, etc.
>
> Turned out the ground lead connection
> outside had loosened up. Re-tightening
> the lead on the ground rod cured all my
> problems.
>
> YMMV
>
> 73, Dick, W1KSZ
>
> On Tue, Feb 4, 2020 at 9:10 AM Glen Zook via Amps <amps at contesting.com>
> wrote:
>
>> Having spent over 30-years as a telecommunications consultant, and having
>> specialties in lightning protection and r.f. grounding, I say that adding
>> ground rods, etc., is NOT balderdash!  No, adding such does not always
>> produce measurable results.  However, the majority of times adding external
>> grounding does contribute favorably.
>> There are PROPER methods of installing coaxial cable.  NFPA NEC (National
>> Electrical Code) requires that the coaxial cable shield be connected to a
>> ground rod at the point where it enters the building.  This is for
>> lightning protection as well as providing an r.f. grounding point.  Also,
>> when the cable is installed on a tower, mast, etc., the shield needs to be
>> grounded to that structure as near the antenna as possible and at the point
>> the cable leaves the structure to enter the building.  In addition, if the
>> structure is higher than around 100-feet, the shield needs to be grounded
>> every 50-feet to 75-feet along the structure.
>> All "other" ground rods, etc., MUST also be connected to the AC mains
>> ground.  There are several reasons for this of which lightning protection
>> is foremost.
>> Way too many seem to think that the 3rd wire in the AC wiring in their
>> house provides sufficient grounding.  Sometimes it does and, more times
>> than not, there can be problems on various bands caused by the length of
>> the wire between the outlet and the AC mains ground rod.
>> The whole idea is to get the lowest impedance path to ground.  When just
>> wire is concerned, the length of the lead needs to be no more than around
>> 4-feet long and shorter is better.  You can increase the length of the
>> grounding path by using something like aluminum flashing which is available
>> in widths from around 4-inches wide to more than 36-inches wide.  Aluminum
>> is not as conductive as copper.  However, it is much cheaper and having
>> wider widths overrides the conductivity.
>> Just get the flashing as near the ground rod as possible (usually on the
>> inside of the building), and then a short piece of large diameter wire
>> through the building wall to the ground rod.
>> There are other things, like using chemical ground rods, that can
>> definitely improve r.f. grounding.  One just has to do as much as possible
>> to achieve a good grounding system.  Of course, the more that the
>> individual can do themselves, the cash outlay is reduced.
>> Glen, K9STH
>> Website: https://k9sth.net
>>
>>      On Monday, February 3, 2020, 09:57:16 PM CST, Jim Brown <
>> jim at audiosystemsgroup.com> wrote:
>> Balderdash. The earth is not a sump into which noise, RFI, and other
>> trash is poured. Comments like this bring to mind the infinite number of
>> monkeys and typewriters producing Shakespeare.
>>
>> 73, Jim K9YC
>>
>>
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