[TenTec] RE: Model 544 CW Filter & NB

[Frank Krozel]

Hi all:
Nice to see the activity on the older Ten Tecs.  I am looking for a Triton I
if anybody has one, any condition, let me know....
On the filters, I have a document at the office that allows the addition of
the crystal filter to a Triton - How sweet can that be..... I was
considering doing that to my Triton II but decided to keep it stock.
If you want a copy of that article, e-mail me.
Frank KG9H

----- Original Message -----
From: "Pepperdine, Brien (CAB)" <brien.pepperdine@cab.gov.on.ca>
To: <tentec@contesting.com>
Sent: Thursday, January 18, 2001 1:08 PM
Subject: [TenTec] RE: Model 544 CW Filter & NB


>
>
> This is the info I sent to Peter on the subject of the Triton IV filter.
> Some of you now or in the future (archived) might find it of use.
>
> You have a good chance of achieving filtering  this way:
> In the QST review of the analog rig version Doug Demaw published the FULL
> schematic of the filter - which actually has 4 widths (and not just the
> one the TT filter made available by their front panel switch). So if you
> build the
> filter and house it in a box (like the 2 width filter used by the Argonaut
> 509) you have  a nice 4 width filter exactly as the Triton IV had (but
which
> did
> not use all available widths). This is really simple to build, in my
> opinion, since it is just an LM747 dual opamp and some caps etc. Easy to
> build with prototype board (copper strips and holes), or dead bug or
> Manhattan style construction.
> See QST of July 1979, page 46.
>
> You could also buy the Vectronics CW filter, which is exactly the same
> filter and schematic from what I can see ( I looked yesterday and the
> whole assembly and parts manual for it is online at their site in Adobe
> .pdf form). While they have it set up as an external audio filter to be
> used at the headphones there is no reason one could not insert it into the
> audio chain inside the Triton where it works before the audio amp stage.
> This is the same design as TT  - it was common at the time in various
> forms and I think possibly also was in QRP Classics, an old ARRL
compendium.
>
> Now, if you want even MORE fun and performance, if you look at the QST for
> Sept 1981, page 17, there is an article describing how to hook in a
> external TenTec Model 217 500 HZ filter into the I.F. chain, giving the
rig
> some good
> narrow CW I.F. filtering. Very nice, taking the thing overall pretty much
> into TT OMNI C territory (if I can go so far as to say that..) since one
> would then have a switchable I.F. cw crystal
> filter in or out, as well as a multiple width CW audio filter if you build
> and use
> the QST  opamp-rc design from the review's spec, or use the Vectronic
> filter.
> The Vectronic filter is I think pretty much what the old MFJ CW-1, CW-2
> etc. external filters are/were and which are found at hamfests and other
> venues of used ham gear.
> Hope this helps you out.
>
> -Information and comments herein are mine own and are separate and
> independent of the electronic information gateways, pathways and
> provider(s) utilized-
>
> --
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>


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