Great job. Thanks for doing it correctly. I bet your stations performance
shows the results of your efforts too.
73
Bob, K4TAX
----- Original Message -----
From: "Gary Hoffman" <ghoffman@spacetech.com>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Monday, April 06, 2009 6:33 PM
Subject: Re: [TenTec] RF Ground
> Apropos of this, I use 1 inch OD soft copper refrigeration tubing for my
> ground connections also. It is quite available and (relatively)
> inexpensive. I order rolls of it from McMaster Carr, but your local
> refrigeration shop will have it too.
>
> In my case I also permanently attach the tubing directly to the grounding
> points in question, (welding) and make runs as short as possible.
>
> For example, the main RF ground is just outside my (separate) shack
> building, and almost directly under it. My tubing runs from the single
> point ground bar located 4 inches behind my rig on the wall, and goes
> straight down through the floor to the outside ground point. Maybe 3.5
> feet
> total length. There is also an outdoor grounding connection plate located
> right there just above the dirt, through which coax cables are brought and
> thus bonded to ground. Those can also be disconnected outdoors, on the
> "shack side" of this plate.
>
> The outside RF "central" ground I have constructed is then bonded
> (outside)
> to all my other grounds, including power system, telephone and cable
> system,
> the grounds at the base of the tower, the grounds at the base of the
> vertical and so forth and so on. None of that comes indoors. All of
> these
> bonds are either refrigeration tubing, or for the longer runs, very heavy
> copper wire. Of course these bonds are safety bonds only.
>
> My RF ground refrigeration tube, being 3.5 feet long is barely more than 1
> meter in length (obviously) which makes it an excellent performer. Useful
> even on the 10 meter band, where it is still only very roughly 0.1
> wavelength long.
>
> 73 de Gary, AA2IZ
>
>
> ----- Original Message -----
> From: "Bob McGraw - K4TAX" <RMcGraw@Blomand.net>
> To: <Gary@doctorgary.net>; "Discussion of Ten-Tec Equipment"
> <tentec@contesting.com>
> Sent: Monday, April 06, 2009 10:23 AM
> Subject: Re: [TenTec] RF Ground
>
>
>> Gary:
>>
>> Here's what Jerry had to say and I agree:
>>
>> quote:
>>
>> If you really want lightning and RF grounding, those ground sources need
>> to be connected together with wide copper strap. 18" is a nice width.
>> Otherwise the inductance is too much to be totally effective.
>>
>> 73, Jerry, K0CQ
>> end quote:
>>
>> The 18" copper strap that Jerry suggests would be nice but would also be
>> a
>> nice investment today.
>>
>> In my case I use a piece of 1/2" copper refrigeration tubing to
>> connect/bond
>> [actually via CAD WELD} all of my driven grounds. There's 3 at the base
>> of
>> the tower in a ring and 1 at each corner of the house. The house has a
>> series of lightning rods across the top. All of these points are
>> connected
>> together. Also, the mast out the top of the tower has 2 bonding flexible
>> straps between the mast and the tower sleeve. This assures that the mast
>> is
>> bonded to the tower and the path is not through my rotor.
>>
>> Yes, in your case, the path between your service ground and your antenna
>> ground is through your station equipment via the coax. Not good!
>>
>> 73
>> Bob, K4TAX
>>
>> .
>>
>> ----- Original Message -----
>> From: "Gary Smith" <Gary@doctorgary.net>
>> To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
>> Sent: Monday, April 06, 2009 5:05 AM
>> Subject: Re: [TenTec] RF Ground
>>
>>
>>> Hi Bob,
>>>
>>> My antennae use the same radial field of 60 or so 130' radials. The
>>> radial plate is 360' from the house. The only connection between the
>>> house and the radial field is via the coax shield. Are you suggesting
>>> I run a length of additional wire from one of the radials to the
>>> grounding point of the service entrance ground rod?
>>>
>>> Gary, KA1J
>>>
>>>> As to having a RF ground, a ground radial system below your antenna is
>>>> the
>>>> reference point for that antenna. Several antennas can share the same
>>>> radial system. Also that radial system must be bonded back to the
>>>> service
>>>> entrance ground.
>>>>
>>>> 73
>>>> Bob, K4TAX
>>>
>>> _______________________________________________
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>>> TenTec@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/tentec
>>>
>>
>>
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>>
>
>
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