Drake DSR-2 muddy audio - UK Vintage Radio Repair and Restoration Discussion Forum

Denwood · 15th Aug 2011, 8:06 pm

Hi,
Would anybody have an idea why I might have distorted audio on AM in this receiver? I can best describe it as 'muddy', and it's not obvious from using a signal generator and oscilloscope what is going on.

The last IF is 50kHz, and I suspect it may be a group delay or phase change problem. It seems OK on SSB. I've not fiddled with the alignment (yet). Any ideas?

Regards,
Murray ZL1BPU

15th Aug 2011, 8:06 pm	#1
Denwood Retired Dormant Member Join Date: Aug 2011 Location: Waiuku, South Auckland, New Zealand Posts: 14	Drake DSR-2 muddy audio Hi, Would anybody have an idea why I might have distorted audio on AM in this receiver? I can best describe it as 'muddy', and it's not obvious from using a signal generator and oscilloscope what is going on. The last IF is 50kHz, and I suspect it may be a group delay or phase change problem. It seems OK on SSB. I've not fiddled with the alignment (yet). Any ideas? Regards, Murray ZL1BPU