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Old 12th May 2017, 4:30 pm   #25
PJL
Dekatron
 
Join Date: Sep 2005
Location: Seaford, East Sussex, UK.
Posts: 5,997
Default Re: Avantic BM611 Stereo Decoder

I have it back on the scope/siggen and it is showing some odd behaviour (hysterisis) through the cathode follower so I am going to try taking it off the detector but it will be marginal without a buffer. The bandwidth is probably a bit tight showing a pretty linear response over +/-99KHz when the signal is just triggering the tuning indicator but take the signal down 10dB it is clearly rolling off at the edges. So next steps are:
1. Improve the signal path from detector to decoder including build a high input impedance buffer.
2. Drag out the Polyskop and have another go at alignment.
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