[RFI] RFI/EMI MAJOR Problems
John Carobine - WB8RFB
wb8rfb at yahoo.com
Wed Nov 29 23:39:46 EST 2006
Please describe what you use for an antenna feedline
and how it is routed from your amplifier to the
Physically, how close is it to the AC wiring in your
house and does it run parallel to it? If so, for what
distance? Are you using any high/low pass filters in
the appropriate locations? Are you on satellite TV or
cable or an outdoor antenna? More info I think will
--- Bob Gates <regates at hughes.net> wrote:
> Hi All,
> I wish all I had to deal with were little noises in
> my receiver. All of my little noises are in my
> head. I apologize if the problems I'm about to
> describe are not best suited to this forum, but I
> can't find one that seems better suited. If there
> is, you certainly won't hurt my feelings if you tell
> me to look elsewhere.
> My problems start when I turn on the linear, at
> anything over about 500w output. At that point I
> generate major TVI, to the tune of completely
> blanking out the screen. All cordless phones
> receive my signal S9, before disconnecting the phone
> altogether. I start tripping GFCIs in some parts of
> the house, and can even lock up my PC on one band,
> after listening to audio/cw coming through the PC
> speakers. I have mix 43 toroids, in various
> combinations, all through the house, to the tune of
> 48 of them.
> I have 8 of them forming a common mode choke at
> three points on my single antenna feed line. I have
> another choke on the power line for my UPS, which
> has my PC hooked through it. I've got the AC power
> lines for all the TVs and base unit for the phones
> wrapped w/ 12 turns around a toroid. And I have an
> 8 toroid choke on the amplifier's power line.
> Since adding all these chokes, I've gone band by
> band to see if one is worse than the other. Haven't
> checked 10M since I don't use it. On 15M, my PC
> locks up and sound comes through the PC speakers.
> TVI is not too bad, and minor interference on the
> phones. No GFCIs seem to trip. 20M is the only
> band with no problems of any kind. 40 and 80M are
> the most serious. Almost ALL of the problems I
> described in the second paragraph. Major TVI, cuts
> out the cordless phones, trips GFCIs. But no
> problem with the PC.
> Antenna is Butternut HF6V on the roof of our two
> story house, and the shack is on the lower level.
> Antenna ground is about 60' of 2x14 romex. Don't
> know what the solid wire equivalent of 3 #14 wires
> is offhand. But it terminates on the opposite side
> of the house from the station ground, clamped to an
> 8' ground rod driven in 7-1/2'. My station ground
> system has all major components connected to #2
> stranded copper wire, about 30' total length, which
> terminates clamped to a 1/2"x8' electrical ground
> rod, driven in to within about 4" of the surface.
> Nothing else is connected to either the antenna or
> station ground. There is a ground wire for the
> house electrical panel that seems to be #2 stranded
> copper, but I can't tell where it's terminated
> underground since the ground here is a tad bit
> frozen right now. Everything in the shack connected
> to AC is on a separate circuit run directly to the
> panel, as is the 220V amp. Rig is a FT1000MP Mk 5
> and the linear is an Emtron DX-3.
> Hope I haven't overwhelmed you with useless
> information. I would certainly appreciate any
> advice on the source of this mess, and potential
> cures. Thanks in advance.
> 73, Bob W7BJ
> dit dit
> RFI mailing list
> RFI at contesting.com
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