[TenTec] Corsair II vs Omni C

[Barry N1EU]

I'm working on an af circuit mod for the C2 to lower the noise but it's
still a work in progress.  It's an easy rig to modify, so I encourage you
to experiment.  Some approaches I'm taking are to minimize the op-amp
chain, seek a replacement for the RC4136 with lower noise op amps, and
adding a low pass audio filter.  What would really be fantastic is a
redesigned if/af board that would be a drop-in replacement.  But we'd need
a design guy to help with that one.

73,
Barry N1EU

On Sat, Mar 9, 2013 at 3:23 AM, Curt <rhulett1 at consolidated.net> wrote:

> A recently acquired Corsair II seems to have a lot more receiver noise
> than an  Omni C.  My impression from reading is that this is a consequence
> of the additional IF to provide PBT, and the type of AF op amps used.  I've
> also seen some references to but no details of modifications that decrease
> this noise.
>
> Also, the N.B. function on mine doesn't seem to accomplish anything.
>  Again, my impression is that this is because these only work on ignition
> noise pulses and not on atmospheric broadband "white" noise.
>
> Any comments would be appreciated.
>
> 73, Curt KB5JO
>
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