[TenTec] Corsair II PBT Question

David and Dianne on Comcast dhhdeh at comcast.net
Sat Oct 27 22:07:56 EDT 2012


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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