[TenTec] Corsair II PBT Question
daniel.schlieper at tuxomania.net
Tue Oct 30 05:36:14 EDT 2012
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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