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

vintage_8bit · 3rd Nov 2021, 12:23 pm

Well after a slow power up the electrolytics seem good and as far as I could tell with my random wire antena connected, and looking at the output on my s.d.r. it appears to work. I can see a humped band of signals & noise traveling up and down in frequency as I change the tuning on the preselector.

Re comment from Bill"(The MA197B was originally designed for the Royal Navy for "Common Antenna Working")" Following up on intermittent output, I found that solder had never flowed to the center conductor on the aerial input socket. I wonder if that ever caused past operators problems. Specially as it could of been used in the path of an aerial daisy chain. Colin.

3rd Nov 2021, 12:23 pm	#19
vintage_8bit Heptode Join Date: Feb 2013 Location: Rainham, Kent, UK. Posts: 525	Re: Racal Preselection & Protection unit Well after a slow power up the electrolytics seem good and as far as I could tell with my random wire antena connected, and looking at the output on my s.d.r. it appears to work. I can see a humped band of signals & noise traveling up and down in frequency as I change the tuning on the preselector. Re comment from Bill"(The MA197B was originally designed for the Royal Navy for "Common Antenna Working")" Following up on intermittent output, I found that solder had never flowed to the center conductor on the aerial input socket. I wonder if that ever caused past operators problems. Specially as it could of been used in the path of an aerial daisy chain. Colin.