39548Re: [FT897] GROUNDING / Weird sounding warbling tone
- Jun 20, 2013Not sure what your point is on that.
If I add a ground rod to my shack and tie it into my equipment that is
grounded via the power outlet, I am creating a system with two different
ground systems which violates the NEC and may create insurance problems
with a claim. My understanding is that all grounds must be tied
a common point - this would include any ground that had a path back to the
power distribution panel via my rig to the power plug. In my case it
would be impossible
to bind a ground outside my operating position with the one on the other
side of the house
where the utilities are grounded.
Someone knowledgeable please correct me if I am mistaken.
If I somehow had a RF ground that was totally separate from the AC mains
would be a different story. But this is impossible for my equipment.
My point is that In my station, I do not need an RF ground for good
functioning of the equipment.
On 6/20/2013 10:41 AM, raydeeoh08@... wrote:
> Electrical (utility) ground is NOT a RF ground.
> Sent from Yahoo! Mail for iPhone
> *From: * Joel <hiqual@...>;
> *To: * <FT897@yahoogroups.com>;
> *Subject: * Re: [FT897] GROUNDING / Weird sounding warbling tone
> *Sent: * Thu, Jun 20, 2013 2:52:08 PM
> On the subject of grounding and RFI - here is my experience with my
> FT-897 and
> grounding in my own shack.
> First off I am an Heretick - I have *no ground connection* other than
> what exists through
> the power plug on the wall. I have a 2nd floor shack and no easy way to
> install a ground
> rod under me - last time I tried I ended up drilling into 12 inches of
> concrete in an attempt
> to reach earth and ran out of drill. Actually I decided not to install
> one then because I would
> then have an out of code ground rod that was not tied in with the
> service panel ground rod.
> My understanding is that NEC requires all grounding systems to be tied
> together at the
> utility ground.
> My rig works very well and I have no problems with RFI now that I have
> mitigated them and
> run antenna connections carefully. I installed a grounding bar on my
> shack desk and tie all
> equipment to this one bus with short runs of wire. 10 Ga stranded for
> the long runs 14 ga
> solid for the short ones.
> I run a multi band trap dipole fed with coax as well as a 60 meter loop
> fed with 450 ohm ladder line that comes into the
> shack. Also a 6 meter squalo and 2 VHF / UHF antennas. I tune that
> loop for all bands 80-6 with a LDG 600pro
> tuner - I also do that with the dipole as needed. I also use a MFJ 993
> b on occasion. I run
> up to 600 watts out from my amplifier with no issues on the FT897.
> Nothing in the shack is
> hot with RF even at high power ( now that I made those changes ).
> I have had to make sure that all my coax runs are kept separated by a
> few inches , run neatly and
> kept at least 8 inches away from the ladder line. I had to add ferrites
> to USB cables to the PC that
> I use for rig control and Digital modes. I use toroids on the CAT cable
> to the rig.
> In the past 40 + years as a Ham, I have run from many locations in
> Condos , Apartments and such and never had to use
> an earth ground. I have also had multiple locations where it was
> convenient to run a ground and did so.
> You would think that a station like mine would need a good earth ground,
> but my experience proves otherwise.
> Net so far - 212 DXCC entities in the last 18 months ( most with 100W )
> . 1000+ 6 meter contacts 1000+ digital contacts..
> On 6/19/2013 11:42 PM, Alex Netherton wrote:
> > "Tuner instructions say tuner should be "well-grounded" to the
> > from the GROUND post on the tuner. Does "well-grounded" simply mean
> I run
> > any gauge/any wire between the tuner (wing nut GND) and my FT897D (GND
> > screw)?"
> > Ah, no. It means that your transmitter *and* tuner should be
> grounded to a
> > good earth ground. An earth ground is ideally a braided copper strap of
> > about 1 inch going from the back of the rig - tuner - etc to the ground
> > outside the shack, which is (again) ideally a 4 foot ground rod made of
> > copper (expensive!!!) or at least copper clad steel. Even more ideally,
> > four of them in parallel.
> > " Balanced Line-Fed Antenna - Tuner instructions say run a jumper
> wire from
> > Wire post to one of the two Balance Line posts. Does that mean I
> simply run
> > any gauge/any wire between the Wire post and the Balance Line post?"
> > but you still need a good ground.
> > If you can't put in a good earth ground, try routing a wire of heavy
> > to something made of metal that is ultimately connected to the earth. If
> > you live far up in an apartment, I would suggest an MFJ Artificial
> > Ground... They work! At any rate, a ground is necessary to keep pesky RF
> > out of the shack.
> > 73
> [Non-text portions of this message have been removed]
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