Or maybe Invar alloy for maximum temperature stability?
---per
At 04:23 16.04.2005, you wrote:
>The problem with the stability is that most of these were constructed
>using a Galvinised steel rod to set the tuning correct? Try a
>replacing it with a more similar metal to copper like brass or copper
>threaded rod if you can find it. or a plastic rod that has good
>tempreture charecteristics. What would be ideal are some threaded
>bushings with set screws and then the rod doesn't need to be threaded.
>
>On 4/15/05, Joe <[EMAIL PROTECTED]> wrote:
> >
> > I had a set of "sewer pipe" duplexers like what you are describing for
> > 220Mhz years ago. I built a wood box, put a small light bulb and a
> > thermostat inside and set it to about 90 degrees. These kept them fairly
> > stable year-round.
> >
> > 73, Joe, k1ike
> >
> > At 07:44 AM 4/15/2005 -0600, you wrote:
> > >Not in Indiana, but a comment. I Used one of those Duplexers years
> ago. Be
> > >careful where you locate it. Extremely sensitive to temperature
> variations.
> > >We had it on a mountaintop and retired it after the first winter.
> > >Gary - K7NEY
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
>
>
>
>
>
>Yahoo! Groups Links
>
>
>
>
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