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Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders.

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Old 14th Feb 2018, 6:54 pm   #1
David Simpson
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Join Date: Mar 2008
Location: Aberdeen, UK.
Posts: 1,524
Default 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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