Roger wrote:
> Carl wrote:
>
>> ----- Original Message ----- From: "Roger" <sub1@rogerhalstead.com>
>> To: <ka4inm@tampabay.rr.com>
>> Cc: "amps" <amps@contesting.com>
>> Sent: Saturday, February 06, 2010 2:02 PM
>> Subject: Re: [Amps] QRO Questions
>>
>>
>>
>>> Ron Youvan wrote:
>>>
>>>>> There was a PTFE coax about the size of RG213 that I saw in Germany
>>>>> (at Friedrichshafen maybe?) some time ago, but I can't remember
>>>>> what it's called and have never seen it since. Anyone know of this
>>>>> stuff?
>>>>>
>>>>>
>>>> There is a PTFE coax about the size of RG-58 with less loss and
>>>> more power handling
>>>> capacity than RG214 so what you mention is a lot more than
>>>> probable. (as is 1/4"
>>>> superflex) I like the Times LMR products, while not as efficient as
>>>> above, many are "direct
>>>> burnable." (polyethylene jacket)
>>>>
>>>>
>>> Of course PTFE gives off toxic fumes if there an arc, or if it is over
>>> heated.
>>>
>>>
>>> 73
>>>
>>> Roger (K8RI)
>>>
>> I guess it may hurt a few birdies on the tower.
>>
> There I'd not be worried<:-)
With our induction heaters and float zone refiners (30 some back in
those days). The refiners ran around 12 KW into widely varying loads and
very high SWRs. We used relatively large, 1 1/2" teflon insulated coax.
The Teflon was wound around the inner conductor and on top of that was a
layer of Teflon cord cross wound to form a mess, another layer of wound
Teflon sheet and then a double braid covered by a fiberglass and PVC jacket.
Typically we'd blow out about one of those every day of two. The
transports that moved through vacuum seals also used Teflon insulation.
There was always a bunch of those stacked up waiting to be rebuilt. When
we'd have an arc over at the base of a transformer there'd be a lot of
black smoke and soot along with a smell similar to Chlorine and most
likely part of the gas was Chlorine. The gas given off is very poisonous
which we didn't find out until a bit later. After they found out what
it gives off when burnt, any arc usually resulted in all the operators
deciding to take a break at the same time.
The gas isn't good for you, but unless in a closed space or you stick
you nose in the smoke it's unlikely to cause any problems.
In research we had one set up using a spark gap to protect the cable and
transport. The device looked very much like a transmitting doorknob cap.
However it had this funny sign on it and contained radioactive Cesium to
set the ionization potential to a specific value. The thing fell apart
in my hands. I dumped it into a pile, put a metal pail over it, rinsed
my hands in an eyewash, and headed for the shower leaving a trail of
clothes down the hall. Time the decon crew got there I was about half
froze, but clean<:-)) Man those showers are C-O-L-D ! Fortunately my
clothes were clean as well so they let me put them back on.
73
Roger (K8RI)
> 73
>
> Roger (K8RI)
>
>> Carl
>>
>> _______________________________________________
>>
>>> Amps mailing list
>>> Amps@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>>
>>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|