[R-390] Filters

[Bob Camp]

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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