[Boatanchors] SX-130 question

Jim Bromley, K7JEB k7jeb at cox.net
Wed Feb 1 23:59:32 EST 2012

Another thing that could be happening is that the AVC still
has a short recovery time constant, appropriate for AM and
CW, but subject to 'pumping' by an SSB signal with accompanying
audio distortion and difficulty in reception.  I think most
SSB receivers derive their AVC (AGC) from product-detected audio,
not from envelope-detected IF.  Just a thought.... Jim, K7JEB

On 2/1/2012 9:44 PM, Fuqua, Bill L wrote:
> The SX130 should be superior to the earlier generation receivers.
> With a product detector there should be no need to have a larger
> BFO signal than IF.  The two are directly mixed by multiplying the two
> sine waves, thus the term product detector. 
>   If I can find time I will plug mine in and see how it performs.
> A bit busy now with guest in the house and teaching classes and work
> schedule. 
>   Another thing is that the 130 has a very unusual crystal filter.
> I need to take a closer look at it. 
> 73
> Bill wa4lav

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