Hi all,
I have some dumb questions that I hope noone minds me asking, and I figured others may have questions about setting their shacks up too.
My question...
I have an HF base rig, a rather long dipole antenna and I need to ground the antenna. How do I do this??? Run coax from rig -> earth spike -> antenna, but how to connect them all together? Just put a cut in the coax partway along and run copper from that to the spike?
Apologies for the dumbness of the question... at least I'm asking before I blow something (or someone - probably myself) up
Cheers
Meg
Setting up your shack
Moderator: VK6ZMS
I don't think it is a dumb question, it's something that's you need to know!
Happy scanning,
Robb Wise,
Scanning Tasmania
www.scanningtasmania.org
Uniden UBC9000XLT & UBCD 996 & 396T. Icom RX7. SW: Sangean ATS 505 & 909
Robb Wise,
Scanning Tasmania
www.scanningtasmania.org
Uniden UBC9000XLT & UBCD 996 & 396T. Icom RX7. SW: Sangean ATS 505 & 909
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Is this in the Foundation manual? I have a feeling I read it there... I can't check any more because somebody stole mine
Check this powerpoint out. It might help
http://www.aksarbenarc.org/main/media/H ... unding.ppt
Choke balun at HamUniverse.. easy to make, no cutting etc
http://www.hamuniverse.com/balun.html
I use this on a couple of 2m antennae
Check this powerpoint out. It might help
http://www.aksarbenarc.org/main/media/H ... unding.ppt
Ground your rig and any other devices to the same point and not from one to the next.A "complete" antenna like a dipole or a ground plane does not need a RF ground, as long as you keep common-mode currents off your feedline. A "current" or "choke" balun is most commonly used for this.
Choke balun at HamUniverse.. easy to make, no cutting etc
http://www.hamuniverse.com/balun.html
I use this on a couple of 2m antennae
Rob
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The powerpoint is perfect - the foundation manual mentions grounding, but doesn't talk about how to do it.robbage wrote:Is this in the Foundation manual? I have a feeling I read it there... I can't check any more because somebody stole mine
Check this powerpoint out. It might help
http://www.aksarbenarc.org/main/media/H ... unding.ppt
Thanks Robbage
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That PowerPoint slide is brilliant!
Page 53 of the first edition Foundation manual (I haven't got my hands on the new one yet), does have a small section on RF Earth:
Also, even though the book mentions a water pipe, I think I'd much rather use a dedicated earth stake.
Page 53 of the first edition Foundation manual (I haven't got my hands on the new one yet), does have a small section on RF Earth:
The photo that goes with the text shows some thick earth wire clamped to a copper rod buried in the ground. One thing I remember being told about connecting the wire to the ground stake is to use a clamp rather than solder.Earthing or Grounding
Your amateur station should have a 'signal earth' consisting of a thick and short wire connected to a ground rod, water pipe or/and a series of buried wires. The thick earth wire is connected to the rear of your antenna tuner or if you don't use a tuner to your transceiver.
A suitable earth can be made using 6 square mm earth wire connected to a ground stake or water pipe. If your station is in a multi-storey building, or more than a few metres above ground, then such earthing is not practical and the methods are mroe difficult. Seek advice from a more experienced person at a local radio club.
Also, even though the book mentions a water pipe, I think I'd much rather use a dedicated earth stake.
Doug Bell (Zebedee) VK6DB
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The problem with using a water pipe is that they are sometimes not a proper ground, with the risk that anybody touching a tap or having a shower can get zapped. This happens occasionally with mains power grounded to water pipe.
Rob
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OF78WD
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Copper water pipe is required to be bonded to the earth stake so doesn't matter what you use they are all connected.robbage wrote:The problem with using a water pipe is that they are sometimes not a proper ground, with the risk that anybody touching a tap or having a shower can get zapped. This happens occasionally with mains power grounded to water pipe.
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I'm not sure what you're trying to say there, would you mind elaborating?FoxtrotZu;u wrote:Copper water pipe is required to be bonded to the earth stake so doesn't matter what you use they are all connected.
Doug Bell (Zebedee) VK6DB
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It is very dark.
You are likely to be eaten by a grue.
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Icom IC-V85 2m VHF Ham TRX handheld
Wouxun KG-UVD1P VHF/UHF wideband Ham TRX handheld
Wouxun KG-679P VHF wideband Ham TRX handheld
Wouxun KG-713 UHF wideband Ham TRX handheld - Location: Just on the border of your waking mind
Yes. Unfortunately people disconnect them, plummers don't have them redone after work, they get knocked off, they corrode and some electricians don't do what they are supposed to in the first place.FoxtrotZu;u wrote:Copper water pipe is required to be bonded to the earth stake so doesn't matter what you use they are all connected.
Rob
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Yep, the station earth isn't a problem - there's a lug on the back of my rig and I have some copper pipe - just a matter of drilling a hole in the floor to feed the wire through and digging some kind of hole in this gravel!Zebedee wrote:The photo that goes with the text shows some thick earth wire clamped to a copper rod buried in the ground. One thing I remember being told about connecting the wire to the ground stake is to use a clamp rather than solder.Earthing or Grounding
Your amateur station should have a 'signal earth' consisting of a thick and short wire connected to a ground rod, water pipe or/and a series of buried wires. The thick earth wire is connected to the rear of your antenna tuner or if you don't use a tuner to your transceiver.
I'm trying to figure out how (and looking at that powerpoint doc - IF) to earth the dipole antenna also.
Either way, I think the antenna goes into the trees tomorrow and we'll start on the earthing system, but I'd like to get everything *right* before I switch on and irradiate everything within a 5km radius - the firies are likely to scold me alot if that happens
Cheeers
Meg
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Yaesu FT-1802M 2m Ham TRX mobile x 2
Yaesu FT-7800R 2m/70cm Ham TRX and wide band RX mobile
Icom IC-208H 2m/70cm Ham TRX and wide band RX mobile
Icom IC-706MKIIG all-band all-mode Ham TRX mobile
Icom IC-V85 2m VHF Ham TRX handheld
Wouxun KG-UVD1P VHF/UHF wideband Ham TRX handheld
Wouxun KG-679P VHF wideband Ham TRX handheld
Wouxun KG-713 UHF wideband Ham TRX handheld - Location: Just on the border of your waking mind
I'm pretty sure you don't need to for a dipole. Does it have a balun on it already or is it a plain coax cable with a wire from the shield and another from the centre? That link I posted about making a balun is easy and doesn't require cutting or soldering the existing antenna. I made mine with about 100mm of PVC pipe with a notch in each end where the coax could be slotted into the notch, wind some turns and slotted into the other notch. If you do it right, you don't need to tape it (tape will perish). The PVC pipe should be UV-stabilised type so it doesn't kark it either.meg wrote:I'm trying to figure out how (and looking at that powerpoint doc - IF) to earth the dipole antenna also
Rob
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OF78WD
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- Location: arrived south - code 44
Thanks Robbage - yep, it's got a balun already. So, this means I might be able to get this rig fired up by the end of the long weekend, which would be fantastic!robbage wrote:I'm pretty sure you don't need to for a dipole. Does it have a balun on it already.
Thanks again, and particularly for not laughing at the dumb question! I'm sure I'll have more...
Cheers
Meg