one should consider the Slipnot clamp by tennadyne
http://www.tennadyne.com/slipp_nott.htm
N9IWW
-----Original Message-----
From: towertalk-request@contesting.com
Sent: Monday, February 06, 2012 10:59 PM
To: towertalk@contesting.com
Subject: TowerTalk Digest, Vol 110, Issue 22
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than "Re: Contents of TowerTalk digest..."
Today's Topics:
1. Re: Climbing Gear (Kenneth Goodwin)
2. Slipp Nott is sold (Jim Spears)
3. Re: XM240 Mast Clamp (Grant Saviers)
4. ICE 419 , sink or source ? (Jamie WW3S)
5. rf burns (chris casey)
6. Re: rf burns (Mike N1TA)
7. Re: rf burns (chris casey)
8. 12AVQ BASE COIL (k3hx@juno.com)
9. Re: rf burns (Jim Brown)
10. Re: rf burns (Mickey Baker)
----------------------------------------------------------------------
Message: 1
Date: Mon, 6 Feb 2012 16:34:00 -0600
From: "Kenneth Goodwin" <krgoodwin@comcast.net>
Subject: Re: [TowerTalk] Climbing Gear
To: <towertalk@contesting.com>
Message-ID: <000001cce51f$6cf404e0$46dc0ea0$@net>
Content-Type: text/plain; charset="us-ascii"
Wolverine Dura Shocks leather boots are my choice. Any good store that
deals in work shoes/boots. Some good on-line sites:
Wolverine http://www.wolverine.com/US/en
Red Wing http://www.redwingshoes.com/
Ken K5RG
------------------------------
Message: 2
Date: Mon, 6 Feb 2012 18:49:24 -0500
From: "Jim Spears" <n1nk@cox.net>
Subject: [TowerTalk] Slipp Nott is sold
To: <towertalk@contesting.com>
Message-ID: <005501cce529$f4b76020$de262060$@net>
Content-Type: text/plain; charset="us-ascii"
FYI, K4FJ beat everyone out in the pileup.
Jim/N1NK
------------------------------
Message: 3
Date: Mon, 06 Feb 2012 17:27:31 -0800
From: Grant Saviers <grants2@pacbell.net>
Subject: Re: [TowerTalk] XM240 Mast Clamp
To: towertalk@contesting.com
Message-ID: <4F307E03.50605@pacbell.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I think "teeth" are a bad bet to get a good grip on an alloy steel mast
which will have yield strength from 80 to 125ksi. The high end of that
range is nearly "file hard" so it will be very unlikely for a toothed
clamp to bite into the mast beyond the galvanizing. Also, even if one
can find as hard as the mast toothed clamp, hard steel on hard steel has
a low coefficient of friction.
Grant KZ1W
On 2/6/2012 1:20 PM, K8RI wrote:
> On 2/6/2012 10:04 AM, John Lemay wrote:
>> I'd suggest that for real grip you do not need lots of contact area,
>> instead
>> you need "teeth" on the saddle.
>>
>> Something like this ...............
> Teeth? Yes, or a rough contact area, but the clamps shown below are not
> what you want to use on a heavy load unless they are far larger than
> they look.
> They cost more, but those large saddle clamps work quite well.
>
> 73
>
> Roger (K8RI)
>
>> http://www.aerial-parts.co.uk/shop/article_150/V-Bolt.html?shop_param=cid%3D
>> 33%26aid%3D150%26
>>
>> Sorry, I think the link has split.
>>
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
------------------------------
Message: 4
Date: Mon, 6 Feb 2012 20:41:42 -0500
From: "Jamie WW3S" <ww3s@zoominternet.net>
Subject: [TowerTalk] ICE 419 , sink or source ?
To: <towertalk@contesting.com>
Message-ID: <49CB5AE23B4047C5A657FA8D3858107A@ww3s>
Content-Type: text/plain; charset="iso-8859-1"
Does anyone have the pinouts for the ICE 419 to control via a band decoder?
Source or sink?
73, Jamie WW3S
------------------------------
Message: 5
Date: Mon, 6 Feb 2012 20:01:25 -0600
From: chris casey <cscvrp@gmail.com>
Subject: [TowerTalk] rf burns
To: towertalk@contesting.com
Message-ID:
<CAHSq-JsuMwP4-DAEoyVPZWHy7TXw5duxOcbPcPe=7CRn6UOMrA@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
So I haven an 80M loop I usually only get to use for sweepstakes every
year, rest of the time the feed line is coiled up in a tree.
I have had opportunity to bring it inside and setup a "permanent"
operating station. I've had grand fun, but see some weird behavior now
and then. When it was wet out a couple days ago while tuning (mfj
tuner, 450ohm window line feed) it would bounce all over. And more
often than not when I get towards a good match I start getting a growl
in my headphones. Tonight I got a doozie of a rf burn off my key base
which sets right in front of the tuner knobs. It will do this on
several bands, 40m down at the bottom of the band tonight.
I have a splice which I figure I'll cut upstream from and add a new
hunk in and add some length. Its a bit short and running right
through a pine tree, I guess I'll add some more feed line in and go
around the tree.
Same antenna with same feed line length matched all over the place
without issue when ran to the travel trailer for sweepstakes. Now if I
don't want nasty noises on TX I have to run an swr above 1.5 usually.
I worked HU2DX on 15M and TX6T/P 17M CW tonight on the first call so
it must not be just a stub of feed line 10' long to the splice...
Besides re-working the splice, and routing around the tree, any ideas?
--
-Chris
------------------------------
Message: 6
Date: Mon, 06 Feb 2012 19:42:36 -0700
From: "Mike N1TA" <mike@n1ta.com>
Subject: Re: [TowerTalk] rf burns
To: towertalk@contesting.com
Message-ID:
<20120206194236.4afedb7d1a081bd79572c9f16ff5db4b.42a1761b35.wbe@email18.secureserver.net>
Content-Type: text/plain; charset="utf-8"
Hi Chis,
What type of ground do you have at your station (if any)?
Mike N1TA
-------- Original Message --------
Subject: [TowerTalk] rf burns
From: chris casey <cscvrp@gmail.com>
Date: Mon, February 06, 2012 7:01 pm
To: towertalk@contesting.com
So I haven an 80M loop I usually only get to use for sweepstakes every
year, rest of the time the feed line is coiled up in a tree.
I have had opportunity to bring it inside and setup a "permanent"
operating station. I've had grand fun, but see some weird behavior now
and then. When it was wet out a couple days ago while tuning (mfj
tuner, 450ohm window line feed) it would bounce all over. And more
often than not when I get towards a good match I start getting a growl
in my headphones. Tonight I got a doozie of a rf burn off my key base
which sets right in front of the tuner knobs. It will do this on
several bands, 40m down at the bottom of the band tonight.
I have a splice which I figure I'll cut upstream from and add a new
hunk in and add some length. Its a bit short and running right
through a pine tree, I guess I'll add some more feed line in and go
around the tree.
Same antenna with same feed line length matched all over the place
without issue when ran to the travel trailer for sweepstakes. Now if I
don't want nasty noises on TX I have to run an swr above 1.5 usually.
I worked HU2DX on 15M and TX6T/P 17M CW tonight on the first call so
it must not be just a stub of feed line 10' long to the splice...
Besides re-working the splice, and routing around the tree, any ideas?
--
-Chris
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
------------------------------
Message: 7
Date: Mon, 6 Feb 2012 21:02:53 -0600
From: chris casey <cscvrp@gmail.com>
Subject: Re: [TowerTalk] rf burns
To: towertalk@contesting.com
Message-ID:
<CAHSq-Js956tvV6cSbpL9VwFgH7izjWL1LXEK4Ad-GAGb9mxwOw@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Yeah, so... I've never had a good ground. Right now the tuner and the
rig are connected by a piece of #14 solid copper, and then the usual
rig to PS to the wall.
Best I can tell I need to bring my station to a ground outside which
is also tied to the service ground. But I can't find a service
ground... So I know I'm exposed in the ground area to some fun.
The thing that I find strange is when I bring this in to the garage,
or into the travel trailer, and connect things the same I have no
problem. Yes its a different plug in the wall, so there are places
where things can be different still. And I took everything apart just
now, re-routed cables etc some, and the behavior changed but is still
there... I need a way to check for RF that doesn't involve my
fingertips. Thats awful.
I see some mention of high voltages created in the tuner and arcing
etc, but I don't think I'm getting arcing but I'm not sure short of a
movie style arc noise I would be sure...
Thanks.
On Mon, Feb 6, 2012 at 8:42 PM, Mike N1TA <mike@n1ta.com> wrote:
> Hi Chis,
>
> What type of ground do you have at your station (if any)?
>
> Mike N1TA
>
>
> -------- Original Message --------
> Subject: [TowerTalk] rf burns
> From: chris casey <cscvrp@gmail.com>
> Date: Mon, February 06, 2012 7:01 pm
> To: towertalk@contesting.com
>
> So I haven an 80M loop I usually only get to use for sweepstakes every
> year, rest of the time the feed line is coiled up in a tree.
>
> I have had opportunity to bring it inside and setup a "permanent"
> operating station. I've had grand fun, but see some weird behavior now
> and then. When it was wet out a couple days ago while tuning (mfj
> tuner, 450ohm window line feed) it would bounce all over. And more
> often than not when I get towards a good match I start getting a growl
> in my headphones. Tonight I got a doozie of a rf burn off my key base
> which sets right in front of the tuner knobs. It will do this on
> several bands, 40m down at the bottom of the band tonight.
>
> I have a splice which I figure I'll cut upstream from and add a new
> hunk in and add some length. Its a bit short and running right
> through a pine tree, I guess I'll add some more feed line in and go
> around the tree.
>
> Same antenna with same feed line length matched all over the place
> without issue when ran to the travel trailer for sweepstakes. Now if I
> don't want nasty noises on TX I have to run an swr above 1.5 usually.
> I worked HU2DX on 15M and TX6T/P 17M CW tonight on the first call so
> it must not be just a stub of feed line 10' long to the splice...
>
> Besides re-working the splice, and routing around the tree, any ideas?
>
> --
>
> -Chris
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
--
-Chris
------------------------------
Message: 8
Date: Tue, 7 Feb 2012 03:26:22 GMT
From: "k3hx@juno.com" <k3hx@juno.com>
Subject: [TowerTalk] 12AVQ BASE COIL
To: towertalk@contesting.com
Message-ID: <20120207.032622.12382.2@webmail09.dca.untd.com>
Content-Type: text/plain; charset=ISO-8859-1
I'd be grateful to know about the matching coil at the base of the 12AVQ.
In particular:
Coil diameter
Coil wire gauge
Number of turns
Location of tap, number of turns from grounded end.
Also any hints or tips about this antenna as mounted upon an elevated
pole would be appreciated.
72,
Tim
____________________________________________________________
Get Free Email with Video Mail & Video Chat!
http://www.juno.com/freeemail?refcd=JUTAGOUT1FREM0210
------------------------------
Message: 9
Date: Mon, 06 Feb 2012 19:48:23 -0800
From: Jim Brown <jim@audiosystemsgroup.com>
Subject: Re: [TowerTalk] rf burns
To: towertalk@contesting.com
Message-ID: <4F309F07.7030303@audiosystemsgroup.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
GROUND is NOT the problem, although you should definitely bond your
station to the earth and to the service entrance. The "service" ground,
whatever it is, goes to the power panel chassis, so THAT'S where you
should go if you can't find what it's grounded to.
As to your RF burns -- you've got RF in the shack because your antenna
is unbalanced, and causing RF current to flow on the feedline. The
easiest solution to that (other than changing the antenna) is to add a
serious common mode choke at the feedpoint. A bifilar choke formed by
winding 14 turns (x2) of #14 or #12 THHN on a #31 ferrite core would
work quite well. See http://audiosystemsgroup.com/RFI-Ham.pdf for
details, and a lot of "why and how it works and why it's needed."
73, Jim Brown K9YC
On 2/6/2012 7:02 PM, chris casey wrote:
> Yeah, so... I've never had a good ground. Right now the tuner and the
> rig are connected by a piece of #14 solid copper, and then the usual
> rig to PS to the wall.
>
> Best I can tell I need to bring my station to a ground outside which
> is also tied to the service ground. But I can't find a service
> ground... So I know I'm exposed in the ground area to some fun.
>
> The thing that I find strange is when I bring this in to the garage,
> or into the travel trailer, and connect things the same I have no
> problem. Yes its a different plug in the wall, so there are places
> where things can be different still. And I took everything apart just
> now, re-routed cables etc some, and the behavior changed but is still
> there... I need a way to check for RF that doesn't involve my
> fingertips. Thats awful.
>
> I see some mention of high voltages created in the tuner and arcing
> etc, but I don't think I'm getting arcing but I'm not sure short of a
> movie style arc noise I would be sure...
>
> Thanks.
>
> On Mon, Feb 6, 2012 at 8:42 PM, Mike N1TA<mike@n1ta.com> wrote:
>> Hi Chis,
>>
>> What type of ground do you have at your station (if any)?
>>
>> Mike N1TA
>>
>>
>> -------- Original Message --------
>> Subject: [TowerTalk] rf burns
>> From: chris casey<cscvrp@gmail.com>
>> Date: Mon, February 06, 2012 7:01 pm
>> To: towertalk@contesting.com
>>
>> So I haven an 80M loop I usually only get to use for sweepstakes every
>> year, rest of the time the feed line is coiled up in a tree.
>>
>> I have had opportunity to bring it inside and setup a "permanent"
>> operating station. I've had grand fun, but see some weird behavior now
>> and then. When it was wet out a couple days ago while tuning (mfj
>> tuner, 450ohm window line feed) it would bounce all over. And more
>> often than not when I get towards a good match I start getting a growl
>> in my headphones. Tonight I got a doozie of a rf burn off my key base
>> which sets right in front of the tuner knobs. It will do this on
>> several bands, 40m down at the bottom of the band tonight.
>>
>> I have a splice which I figure I'll cut upstream from and add a new
>> hunk in and add some length. Its a bit short and running right
>> through a pine tree, I guess I'll add some more feed line in and go
>> around the tree.
>>
>> Same antenna with same feed line length matched all over the place
>> without issue when ran to the travel trailer for sweepstakes. Now if I
>> don't want nasty noises on TX I have to run an swr above 1.5 usually.
>> I worked HU2DX on 15M and TX6T/P 17M CW tonight on the first call so
>> it must not be just a stub of feed line 10' long to the splice...
>>
>> Besides re-working the splice, and routing around the tree, any ideas?
>>
>>
------------------------------
Message: 10
Date: Mon, 6 Feb 2012 22:59:33 -0500
From: Mickey Baker <fishflorida@gmail.com>
Subject: Re: [TowerTalk] rf burns
To: chris casey <cscvrp@gmail.com>
Cc: "towertalk@contesting.com" <towertalk@contesting.com>
Message-ID: <31B3B8EB-4620-4830-B43F-FEA9B6B3DF85@gmail.com>
Content-Type: text/plain; charset=us-ascii
When n1ta asked the ground question, I thought "ding ding ding... We have a
winner."
The reality is that, somehow, your transmitted energy found a path of low
impedance through your body, likely to ground or what appeared
(electrically) to be another part of the antenna system. You will likely
continue to get zapped occasionally until you establish a common ground for
the gear in your shack.
Try using extension cords, different antennas and variable coax lengths into
your garage and travel trailer and you'll find lengths that will cause you
to get burned there, too, or worse.
Or bring everything in your shack to nearly the same rf potential by
establishing a good single point ground for everything and reap fringe
benefits like a lower noise level.
Seriously, be careful - this is a safety issue. You could be hurt or killed.
Mickey
On Feb 6, 2012, at 10:02 PM, chris casey <cscvrp@gmail.com> wrote:
> Yeah, so... I've never had a good ground. Right now the tuner and the
> rig are connected by a piece of #14 solid copper, and then the usual
> rig to PS to the wall.
>
> Best I can tell I need to bring my station to a ground outside which
> is also tied to the service ground. But I can't find a service
> ground... So I know I'm exposed in the ground area to some fun.
>
> The thing that I find strange is when I bring this in to the garage,
> or into the travel trailer, and connect things the same I have no
> problem. Yes its a different plug in the wall, so there are places
> where things can be different still. And I took everything apart just
> now, re-routed cables etc some, and the behavior changed but is still
> there... I need a way to check for RF that doesn't involve my
> fingertips. Thats awful.
>
> I see some mention of high voltages created in the tuner and arcing
> etc, but I don't think I'm getting arcing but I'm not sure short of a
> movie style arc noise I would be sure...
>
> Thanks.
>
> On Mon, Feb 6, 2012 at 8:42 PM, Mike N1TA <mike@n1ta.com> wrote:
>> Hi Chis,
>>
>> What type of ground do you have at your station (if any)?
>>
>> Mike N1TA
>>
>>
>> -------- Original Message --------
>> Subject: [TowerTalk] rf burns
>> From: chris casey <cscvrp@gmail.com>
>> Date: Mon, February 06, 2012 7:01 pm
>> To: towertalk@contesting.com
>>
>> So I haven an 80M loop I usually only get to use for sweepstakes every
>> year, rest of the time the feed line is coiled up in a tree.
>>
>> I have had opportunity to bring it inside and setup a "permanent"
>> operating station. I've had grand fun, but see some weird behavior now
>> and then. When it was wet out a couple days ago while tuning (mfj
>> tuner, 450ohm window line feed) it would bounce all over. And more
>> often than not when I get towards a good match I start getting a growl
>> in my headphones. Tonight I got a doozie of a rf burn off my key base
>> which sets right in front of the tuner knobs. It will do this on
>> several bands, 40m down at the bottom of the band tonight.
>>
>> I have a splice which I figure I'll cut upstream from and add a new
>> hunk in and add some length. Its a bit short and running right
>> through a pine tree, I guess I'll add some more feed line in and go
>> around the tree.
>>
>> Same antenna with same feed line length matched all over the place
>> without issue when ran to the travel trailer for sweepstakes. Now if I
>> don't want nasty noises on TX I have to run an swr above 1.5 usually.
>> I worked HU2DX on 15M and TX6T/P 17M CW tonight on the first call so
>> it must not be just a stub of feed line 10' long to the splice...
>>
>> Besides re-working the splice, and routing around the tree, any ideas?
>>
>> --
>>
>> -Chris
>> _______________________________________________
>>
>>
>>
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk@contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
>>
>> _______________________________________________
>>
>>
>>
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk@contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
>
>
>
> --
>
> -Chris
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
------------------------------
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End of TowerTalk Digest, Vol 110, Issue 22
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