[TowerTalk] TowerTalk Digest, Vol 136, Issue 10
ftravanty
W9JCC at wi.rr.com
Fri Apr 4 15:52:51 EDT 2014
Thanks. No, definately not in the control box. Can read ~ 2 ohms at
times at the cable pins.
Frank W9JCC
On 4/4/2014 1:16 PM, Grant Saviers wrote:
> It's been a while since mine was apart, but I don't see how water can
> get to the pot. IRRC it's on top under the cast Al top bell, so it
> would take a hole in that bell to get water to it. Also, could be the
> ball bearings need cleaned and lubricated.
>
> Are you sure it is the pot in the rotator? The pointer o-ring belts
> stretch and slip in the stock controller and give erratic operation of
> the pointer and I think the nulling pot inside the controller. If you
> are using a Green Heron then you know it is the rotator pot.
>
> I bought the min qty (100) of the o-ring and will send a couple of
> them to anybody that sends me a SASE. Address ok on QRZ
>
> Grant KZ1W
>
>
> On 4/4/2014 9:48 AM, ftravanty wrote:
>> I plan on taking my Yaesu G-2800SDX rotor down this summer to replace
>> an intermittent position feedback pot, that has been acting up for
>> the last three years. It's been in service for over 15 years with low
>> usage. I suspect moisture possibly thaw &freezing in the winter.
>> Couple of questions. Anyone have any pot failure history with the
>> G-2800 series rotor? Anyone have factory setup instructions for re
>> assembly , and is it worth trying to shield the pot shaft bushing
>> from water in this model rotor,?
>> Thanks,
>> Frank W9JCC
>>
>>
>>
>> On 4/4/2014 11:00 AM, towertalk-request at contesting.com wrote:
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>>> When replying, please edit your Subject line so it is more specific
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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 at 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 at aol.com)
>>> 8. Re: Elementary feedline loss question (David Robbins)
>>>
>>>
>>> ----------------------------------------------------------------------
>>>
>>> Message: 1
>>> Date: Fri, 4 Apr 2014 09:34:26 -0400
>>> From: Scott Bullock <scottb at radios-online.com>
>>> To: David Robbins <k1ttt at arrl.net>
>>> Cc: "<towertalk at contesting.com>" <towertalk at contesting.com>
>>> Subject: Re: [TowerTalk] TIC Potentiometer
>>> Message-ID: <AF12D689-D485-43B9-95C2-4C80EAE68470 at 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 at 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 at arrl.net
>>>> web: http://wiki.k1ttt.net
>>>> AR-Cluster node: 145.69MHz or telnet://k1ttt.net
>>>>
>>>>
>>>> -----Original Message-----
>>>> From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf
>>>> Of Scott
>>>> Bullock
>>>> Sent: Friday, April 04, 2014 13:18
>>>> To: Patrick Greenlee
>>>> Cc: towertalk at 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 at windstream.net>
>>> To: towertalk at contesting.com
>>> Subject: Re: [TowerTalk] Fulton 2500 winch single or dual speed?
>>> Message-ID: <533EB862.7010307 at 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 at 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
>>>>> _______________________________________________
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> TowerTalk mailing list
>>>>> TowerTalk at contesting.com
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>>>>
>>>> _______________________________________________
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> TowerTalk mailing list
>>>> TowerTalk at contesting.com
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>>>>
>>>
>>>
>>> ------------------------------
>>>
>>> Message: 3
>>> Date: Fri, 04 Apr 2014 09:53:55 -0400
>>> From: Pete Smith N4ZR <n4zr at contesting.com>
>>> To: TOWERTALK at contesting.com
>>> Subject: [TowerTalk] Elementary feedline loss question
>>> Message-ID: <533EB973.70707 at 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?
>>>
>>
>> _______________________________________________
>>
>>
>>
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