[TenTec] FW: Corsair vs Corsair II

[Steve Hunt]

Jerry,

It's yet another error on the schematic! I lifted L5 this morning and 
measured it: 330nH, not 3.3mH; it resonates with C16 (1000pF) close to 9MHz.

L9 and L10 on that same schematic are similarly in error.

73,
Steve G3TXQ



On 13/03/2013 20:01, Jerry Haigwood wrote:
> Hi Steve,
>      I agree with you.  I don't quite understand what is going on with the
> convoluted Bridge-Tee diplexer on the Corsair II.  A properly designed
> Bridge-Tee diplexer with a Q of 1 would have L5, L6 of 0.88 uHy with C15,
> C16 having values of 354 pF.  I could understand TenTec using a Q different
> than 1 but from looking at their values, it appears they are concerned with
> terminating frequencies below 88 KHz.  Like you stated we have no way of
> figuring out what they are passing but one would figure they want to pass 9
> MHz.  If I had some extra time, maybe I could build a proper Bridge-Tee
> diplexer and try it out.  However, I am not sure how to make any definitive
> measurements since the Corsair II already has excellent dynamic range.
> Jerry W5JH
> "building something without experimenting is just solder practice"
>
>