[R-390] 8k filter

Tue, 11 Feb 2003 07:33:31 -0500

Uh, Hey Wally ...

Uh, ummmm .. I don't think the kids wanna know that about mechanical
filters.

Beaver

Seriously though, some run their '390's 24/7 or nearly.  20,000/24 = 833
days over 365 = 2.28 years, roughly 2 years, 3 months.  Even taking a mere
fraction of that daily usage, it would seem a lot of our filters are on
borrowed time.  Then, again, I've come across quite a few bad crystals.  "A
diamond is forever", but maybe not quartz.

OK, time for somebody to start working on direct replacement DSP filters.
Tough part is going to be stuffing them into those shiny little cylinders.
;-)

Barry

----- Original Message -----
From: "LI WHA HO WALLY" <[email protected]>
To: "MURPH" <[email protected]>; <[email protected]>
Sent: Tuesday, February 11, 2003 6:50 AM
Subject: Re: [R-390] 8k filter

> Murph, This is the characteristic sign of failure...
> Mechanical filters do not last forever, although most
> people believe they do.... They are designed for about
> 20,000 hours of use...... Sorry...  73's WALLY  K5OP
> --- MURPH <[email protected]> wrote:
> >
> >         Has
> > anyone experienced a decrease in signal strength of
> > about 20 db in the 8k
> > filter position? Sometimes mine will read like the
> > other filter (within +
> > - 2db) positions until the radio is turned off, then
> > back to the 20db
> > decrease.
> >
> > Any Ideas?
> >
> > Richard
> >
> >
> >
> >
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