[R-390] Filters

[ka9egw1 at britewerkz.com]

So if not PTFE, what sort of coax was he speaking of, do you suppose?  Is
there a 'special' teflon good to extreme temps?  Would that be the stuff
used in PTFE-dielectric PL-259's?  Or was he maybe just exaggerating in
the interest of emphasizing a point that Teflon is harder to melt than,
say, polyethlyene?

<NOW I'm confused>
73, Brian KA9EGW

> Hi
>
> Most teflon is rated to about 450 to 550 F.  You can indeed melt it with a
> torch.
>
> Bob
>
> On Feb 16, 2013, at 11:24 AM, KA9EGW <ka9egw1 at britewerkz.com> wrote:
>
>> If it is actually teflon, good luck trying to get it to melt.  Years ago
>> when I was a Novice, WA9TIR told me [speaking in praise of
>> Teflon-dielectric coax] "you can get that stuff glowing red and it won't
>> melt".  Whehter he was exaggerating I know not.
>>
>> if it's polyethylene, good luck keeping it from melting.
>>
>>
>> On 2/16/2013 8:00 AM, quartz55 wrote:
>>> I've got some 1/2" hardline.  Wonder if I could cut out enough teflon
>>> foam or whatever that dielectric is to use for the filter spacer?  Then
>>> how do you keep it from melting when soldering back together?  Or like
>>> someone said, use JB Weld.
>>>
>>> I've already sent the IF output (16KHz) to an SRA-3 mixer to mix the
>>> 455 down to 12KHz and fed it into my soundcard, used 'Dream' to
>>> demodulate it.  I made up a 467KHz oscillator to drive the mixer. It
>>> seems to work, but is a pain to work with.  I couldn't seem to get the
>>> Radio Mondiale to demodulate, but then was not sure I had the signal.
>>>
>>> BTW I put the Fluke ohmeter on some of that foam used to put ICs into.
>>> It measures about 2Meg at 1/4" spacing, about 3Meg at 1".  Don't think
>>> that's a good solution.
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