[TenTec] Argonaut II/Delta II crystal filters

[Kevin Purcell]

Especially as Ten Tec holds a patent on the Jones Filter (until  
2009). Interesting read.

<http://www.google.com/patents?id=blsfAAAAEBAJ>

I suspect Elecraft aren't using it (though I'd love to hear that they  
licensed it). Previously mentioned on the Ten-Tec list

<http://lists.contesting.com/_tentec/2004-10/msg00106.html>

It's a compromise design. It's 8 crystals (and some varactors) doing  
the work of quite a few more crystals in a small space.

I think it's a win for compact equipment (like the small Scout/Argo)  
but I didn't think it was a good match to the "bigger" gear like the  
Argo/Delta II.

On Aug 1, 2007, at 5:37 AM, Bob Towers wrote:

>> Bottom line, TenTec dropped the Jones filter as it was a failure.  
>> Elecraft
>> uses it and has had success with it, to say the least!
>
> Ah, see my second comment! It's certainly a much better filter in the
> K2, though I would like that PBT and fully variable bandwidth on my  
> K2.
> Can't have everything, I suppose.

--
73 DE N7WIM / G8UDP
Kevin Purcell
kevinpurcell at pobox.com