[TenTec] proper caps for Omni V?--> Sanyo Oscon

[Dr. Gerald N. Johnson]

On Wed, 2008-03-05 at 17:44 -0500, Joe Roberts wrote:
> There is WAY WAY too much AF gain in the Omni V. A factory recommended 
> fix was posted on this board recently by Don K6RV on 16 Feb 08.
> 
> There is also some overdrive of the product detector going on. W3TS mods 
> address that issue. Big help with IF noise and resulting AF intermod.
> 
> While re-capping your rig, try Increasing the SSB AGC time constant caps 
>    to avoid pumping. I did this before recapping the rest of the board 
> and noted an increase in definition and clarity, as well as less jumpy 
> AGC, but I think the quality enhancement was a fresh spunky cap at work 
> rather than the change of value.
> 
> There are a number of overlapping issues with the Omni V that all impact 
>   listening enjoyment. AF gain distribution is one, but excessive 
> digital noise which can be fixed by good caps and the above-mentioned IF 
> gain issue are others.
> 
> Replacing the stock 1st IF sideband filter with the 2.7 INRAD is also a 
> fabulous improvement which goes beyond mere bandwidth considerations. I 
> have never seem this adequately explained, but the ears don't lie (and 
> even if they do, how can you tell?). Others have commented on this 
> effect, so it is not just me.

You may like that added bandwidth out to 3 KHz audio but I prefer to
roll it off at about 2100 Hz with the DSP in my receiver. I find it copy
of voice signals is more comfortable with the narrower bandwidth.
Perhaps that comes from years of using a Collins with a 2.1 KHz filter
bandwidth.
> 
> All I can say is that it is extremely worthwhile to "retread" the good 
> old Omni V. With the fixes, it sounds as good as anything I've ever 
> heard...and I have always been a obnoxious snob about good RX audio.
> 
> Of course, the basic performance is outstanding too...and with the mods 
> you can finally enjoy it.
> 
> 
> 73 Joe N5KAT
> 
73, Jerry, K0CQ