[TenTec] FW: Corsair vs Corsair II

[Jerry Haigwood]

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"




-----Original Message-----
From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Steve Hunt
Sent: Wednesday, March 13, 2013 4:28 AM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] FW: Corsair vs Corsair II

That should have been:

"....... you'd expect around 5.6uH to resonate with C15 at 9MHz"

Steve G3TXQ



On 13/03/2013 09:24, Steve Hunt wrote:
> The CorsairII has what appears to be a Bridge-Tee diplexer between the 
> mixer and the Norton amplifier - R23, R24, L5, L6, C15, C16. However, 
> the values of L5 and C16 look very odd.
>
> I don't know the value of L6 (part# 21056), but you'd expect around 
> 6.6uH to resonate with C15 at 9MHz. You'd also expect L5 and C16 to 
> resonate at 9MHz, but 3.3mH for L5 seems way too high. A possible 
> misprint?
>
> Steve G3TXQ
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>

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