UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Help with FM tuner Signal injection/probing

PJL · 25th Apr 2019, 11:09 am

I have used a 2022 and a tek 454a scope with sweep output for this. The 2022 can FM modulate +/- 100kHz so connect the sweep output to the 2022 external modulation input and use a x10 or higher probe to monitor the discriminator output. The 2022 seemed to have an AGC on the modulation input so it just worked for me. This is for alignment and will not help with sensitivity measurements.

25th Apr 2019, 11:09 am	#2
PJL Dekatron Join Date: Sep 2005 Location: Seaford, East Sussex, UK. Posts: 5,997	Re: Help with FM tuner Signal injection/probing I have used a 2022 and a tek 454a scope with sweep output for this. The 2022 can FM modulate +/- 100kHz so connect the sweep output to the 2022 external modulation input and use a x10 or higher probe to monitor the discriminator output. The 2022 seemed to have an AGC on the modulation input so it just worked for me. This is for alignment and will not help with sensitivity measurements.