[Amps] Amp causing RFI

[Richard Solomon]

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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