[TenTec] Corsair II PBT Question

Daniel Schlieper daniel.schlieper at tuxomania.net
Tue Oct 30 05:36:14 EDT 2012

Hi Dave,

I try to find the Inrad 2.8 kHz filter for 6 MHz IF, but cannot see 
anything suitable on the Inrad website. Do you know the order number?

I wonder if this mod actually needs an 2.8 kHz filter. Would the 2.4 kHz 
filter (Inrad # 756) do as well? Or is the width critical?

73 Daniel DM3DA

On Sat, 27 Oct 2012, David and Dianne on Comcast wrote:

> Your PBT imbalance problem is likely caused by asymmetrical 2.4 KHz filters 
> in the Corsair II. This is a long known problem with the CSII, Omni V and 
> Omni VI's.
> I have had similar experiences with all of the many (!) Corsair II's I have 
> owed over the years along with an Omni V and Omni VI. L/O and IF stage 
> alignments will not improve this problem caused the inconsistent performance 
> and design of the stock TT 2.4 KHz filters.
> The remedy is to replace both 2.4 KHz stock filters with INRAD 2.8 KHz 
> filters in the 9 and 6 MHz IF stages and to make sure the the local ocs's are 
> adjusted as`perfectly as possible.
> You will be rewarded with far improved SSB audio fidelity and wonderful SSB 
> TX audio.
> What you are describing I experienced with all the TT radios of this IF 
> design that I have owned over the years. The 100% fix is this filter swap. 
> Pricey but really worth it. Any easy swap out.  You can also install the 2.4 
> KHz filter board (9 MHz) with sockets to make future filter swapping really 
> easy.  I think that Barry N1EU documented that mod. (Check out his really 
> neat CSII wiki site at http://corsair.wikidot.com/corsair-9mhz)
> I have a last production run Omni V and last production run CSII that I have 
> switched out these filters and the results are super.
> 73 de N1LQ-Dave
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