Very enlightening, thanks, that component date code is also very helpful. I
got more than I asked for and I appreciate it.
73, Jim wd4air
>From: Duane - N9DG <n9dg@yahoo.com>
>Reply-To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
>To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
>Subject: Re: [TenTec] Identification of filters in my Corsair
>Date: Thu, 5 May 2005 18:46:29 -0700 (PDT)
>
>--- James Duffer <dufferjames@hotmail.com> wrote:
> > I am wanting the Ten-Tec idntification of the crystal
> > filters in my Corsair.
> >
> > On the PBT 80979 Rev A board the .25 position. I have a 6
> > pole filter with
> > two banks of three each crystals. On one crystal on one
> > bank is stamped
> > 48054. On the other bank of three, two crystals have the
> > following: one
> > has NSI, another has 84-05. What is the 3 number Ten-Tec
> > part for this filter?
>
>282
>
> > In the 0.5 position of the board another 6 pole filter with
> > the following
> > stamped on the crystals 48053, NSI, 84-04. Similar to the
> > .25 filter. What is this Ten-Tec number:
>
>285
>
> > In the 2.4 position an eight (8) pole crystal filter is
> > marked 48074, NSI,
> > 84-01. What is the Ten-Tec filter number for this filter?
>
>I'm not aware of the 2.4 kHz filter ever being offered as an
>option, so as far as I know it does not have any "28x"
>designation.
>
> > On the board 80977 is an 8 pole filter with a crystal
> > stamped 8321 and
> > another stamped in black ink 220. I believe the 220 is the
> > Ten-Tec number
> > for this particular filter. If not please enlighten me.
>
>Yupp you're right. It's the only 9MHz filter in a Corsair.
>
> > I just sold a Corsair recently and the filters were plainly
> > marked with 3
> > digit numbers. I am wondering what is the deal with these
> > filters.
>
>My interpretation (ok, ok so it's only a guess) is that the
>filters that do not have the model numbers i.e. 282, 285,
>288, etc. stamped on them were factory installed with the
>radio when it was built. Those that do have the 3 digit model
>number are added after the radio left the factory. Any better
>guesses???
>
>Not sure what the NSI is for but the 4 digit numbers are
>manufacturing date codes. So "8321" means that it was
>manufactured in the 21st week of 1983. BTW that 4 digit
>component coding scheme is quite common for electronic
>component parts of all kinds. They often provide some rough
>clues as to when a piece of equipment was made. Not all
>components have them but many do, and not all 4 digit codes
>are date codes, so be carefull when when trying draw
>conclusions from those numbers. And in some cases when
>service work was done to a piece of gear some much newer
>codes will be present, - again use caution.
>
>Even with those cautions you can still usually estimate a
>piece of equipment's age with an accuracy of 6 months to a
>year or so of when it was manufactured.
>
>Duane
>N9DG
>
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