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Today's Topics:
1. Re: TIC Potentiometer (Scott Bullock)
2. Re: Fulton 2500 winch single or dual speed? (Patrick Greenlee)
3. Elementary feedline loss question (Pete Smith N4ZR)
4. Re: TIC Potentiometer (john@kk9a.com)
5. Re: TIC Potentiometer (Steve London)
6. Fwd: Elementary feedline loss question (Hans Hammarquist)
7. Re: Icom Filters FL-52A and FL-96 (K7LXC@aol.com)
8. Re: Elementary feedline loss question (David Robbins)
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Message: 1
Date: Fri, 4 Apr 2014 09:34:26 -0400
From: Scott Bullock <scottb@radios-online.com>
To: David Robbins <k1ttt@arrl.net>
Cc: "<towertalk@contesting.com>" <towertalk@contesting.com>
Subject: Re: [TowerTalk] TIC Potentiometer
Message-ID: <AF12D689-D485-43B9-95C2-4C80EAE68470@radios-online.com>
Content-Type: text/plain; charset=us-ascii
Like I said some don't have the problems like we have :) Saltwater
environment...maybe this is why I dunno. Some people have never has issues on
any of these rotors ever. I seem to be on a first name basis with mr Murphy :)
Hi Dave
Scott
N1CX
Salty's
www.radios-online.com
On Apr 4, 2014, at 9:26 AM, "David Robbins" <k1ttt@arrl.net> wrote:
I have 5 of them up in the air, some getting pretty old, and haven't
replaced a pot in at least 10 years, so far back I can't remember the last
one I did... in fact I just went and found the bag of spare parts for TIC
stuff... I bought 3 clarostat pots in 2003 and still have 2 of them.
David Robbins K1TTT
e-mail: mailto:k1ttt@arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Scott
Bullock
Sent: Friday, April 04, 2014 13:18
To: Patrick Greenlee
Cc: towertalk@contesting.com
Subject: Re: [TowerTalk] TIC Potentiometer
Yea it's a shame a multi thousand dollar piece of equipment is rendered
useless by just a drop of water. Some people have never had a problem like
this. Some like us up here have helped keep vishay in business lol. Seems to
happen less in dry environments like out west etc.
I've spent thousands of hours thinking abt these problems. It's crazy.
Always a stupid little thing that causes them to fail.
Had thought abt putting silicone on the shaft also and may work, in my case
I never thought there would be enough heat inside the Bellhousing to dry
that washer out. Was happy to see we got a few seasons out of that mod. Have
seen pots go bad on brand new rotors less than 2 weeks old. Any of these
that has the shaft pointing up this is more susceptible to happen to. No
drain for water to get out...
Scott
N1CX
Salty's
www.radios-online.com
------------------------------
Message: 2
Date: Fri, 04 Apr 2014 08:49:22 -0500
From: Patrick Greenlee <patrick_g@windstream.net>
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Fulton 2500 winch single or dual speed?
Message-ID: <533EB862.7010307@windstream.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
You were lucky to only have to go to a clinic to get skin flap
reattached. A free wheeling multi-speed winch (coffee grinder - jib
sheet on racing boat) malfunctioned and went free wheeling killing the
crewman manning it with the equivalent of a terrific upper cut punch. I
subsequently sailed aboard that boat and for safety the winch was locked
into one gear. I assure you I always kept my head over the winch out of
the swinging arc of the handles on either side.
It is best to not employ manual winches that free wheel as they are an
accident waiting for a chance to happen. When injury or death are
potential consequences, a few $ more for safety should be a no brainer.
Patrick NJ5G
On 4/3/2014 10:57 PM, Roger (K8RI) on TT wrote:
On 4/3/2014 12:06 PM, jcjacobsen@q.com wrote:
How do,
Gerald is looking for a new winch for his tower.
Please, be careful that you don't get a winch that has a FREE WHEEL
position.
Been there, done that, and had to go to the emergency room to get the
hide put back on the back of my hand. It was just a glancing blow
that peeled the skin off nearly half the back of my hand from knuckles
almost to the wrist bone.
Nothing worse than the winch getting in that mode and having the
handle whipping around at a rapid pace,
I'd say getting hit by it rates right up there.
not to mention the tower dropping at the same or greater rate. Most
marine/boat winches are free wheeling.
Mine has a latch, but I was lowering a mast that wasn't terribly heavy
and had it unhooked. My hand slipped off the handle, but the handle
stopped pointing straight up. I knew better, but it was stationary.
Just as I grabbed, it went around once so fast I couldn't see it
move! Had it hit square it would have broken a bunch of those small
bones. As it is I only have a scar that covers about a third of the
back of my left hand.
Those winches can be dangerous and it only takes a moment of
inattention to put you in a lot of pain.
73
Roger (K8RI)
73
K9WN Jake
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------------------------------
Message: 3
Date: Fri, 04 Apr 2014 09:53:55 -0400
From: Pete Smith N4ZR <n4zr@contesting.com>
To: TOWERTALK@contesting.com
Subject: [TowerTalk] Elementary feedline loss question
Message-ID: <533EB973.70707@contesting.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
If I terminate a long 50-ohm coaxial cable with a 50-ohm dummy load, and
put an MFJ-259B on the other end, and it reads R=56, X=0 at a given
frequency, what is the mathematical relationship between the measured R
(leaving calibration out of it, for now) and the loss in dB?