UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Standard Beam Approach

jamesinnewcastl · 17th Mar 2023, 10:40 pm

Hi All

Valve 5 in now. This is the one that extracts the audio from the incoming signal. See the YouTube link below for a video simulating the aircraft swinging from too far left to too far right on approach. Dots - then silence then dashes.

https://www.youtube.com/watch?v=p0YYN8qF7vg

The receiver is really only responding to the RF, converting it to an IF and then detecting the audio, the effect of flying across the 'beam' is all done by the box you can see me operating in the video. In real life of course the SBA kit would be moved across the beam on an aircraft - I've not got that far - yet!

There is a bad joint somewhere as you can hear a mad sqeak towards the end of the video but I'll fix that later. Next I need to get the dials going, that's the job of valve 6, the last one!

Cheers
James

17th Mar 2023, 10:40 pm	#72
jamesinnewcastl Heptode Join Date: Jul 2009 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 723	Re: Standard Beam Approach - Rebuild update Hi All Valve 5 in now. This is the one that extracts the audio from the incoming signal. See the YouTube link below for a video simulating the aircraft swinging from too far left to too far right on approach. Dots - then silence then dashes. https://www.youtube.com/watch?v=p0YYN8qF7vg The receiver is really only responding to the RF, converting it to an IF and then detecting the audio, the effect of flying across the 'beam' is all done by the box you can see me operating in the video. In real life of course the SBA kit would be moved across the beam on an aircraft - I've not got that far - yet! There is a bad joint somewhere as you can hear a mad sqeak towards the end of the video but I'll fix that later. Next I need to get the dials going, that's the job of valve 6, the last one! Cheers James