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-   -   Marconi 995A/5 Sig Gen Modulation Interference (https://www.vintage-radio.net/forum/showthread.php?t=143942)

David Simpson 14th Feb 2018 6:54 pm

Marconi 995A/5 Sig Gen Modulation Interference
 
Just wondering - are there any 995A/5 buffs out there who have experienced AM modulation remaining when FM is selected on S1. I.e. 50% AM modulation (meter fsd) set, but approx. 25% remains when set to Int. FM when scoping 20MHz 100mV o/p profile. Note, modulation meter(Racal Dana 9009A) had given correct AM & FM settings of 50% AM, & 5Kc/s & 15 Kc/s Dev.

Regards, David


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