UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - FM to AM converter

coopzone · 27th Sep 2018, 4:56 pm

hi,

This AM transmitter seems to be very stable and does not drift significantly. I think in part this is due to the tank circuit using a choke type coil that's encapsulated. Also it uses emitter coupling to the aerial. The frequency remains stable even with voltage change in the supply. The only thing that seems to effect the frequency is if you grab the aerial, even then not much change.

Derek

27th Sep 2018, 4:56 pm	#15
coopzone Hexode Join Date: Jan 2018 Location: Cannock, Staffordshire, UK. Posts: 268	Re: FM to AM converter - variation on a theme! hi, This AM transmitter seems to be very stable and does not drift significantly. I think in part this is due to the tank circuit using a choke type coil that's encapsulated. Also it uses emitter coupling to the aerial. The frequency remains stable even with voltage change in the supply. The only thing that seems to effect the frequency is if you grab the aerial, even then not much change. Derek