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

simonjp · 5th Oct 2018, 12:06 pm

Hi gents

Panic over.

Due to a total ignorance on my behalf and having not RTFM, and a lack of understanding of the layout, had a knee jerk reaction and assumed that the missing pcb was the issue.

The pcb was the isb pcb, so last night I spent much time reading about this new variant of dsb.

So without the isb/audio board is no problem.

After cleaning the mode switch and Mhz change switch and applying some nyogel 760 grease, the radio has sprung into life.

The speaker pops a bit but with cans on its fine.

Just need to get an understanding of filters now, which dont seem to do very much.

Anyway, considerable progress if a little egg on the face.

Thanks everyone.

Now I just need to get to the display logic and make an interface using a PIC and a look up table to drive the MA1720 in transceiver mode. ( winter project)

5th Oct 2018, 12:06 pm	#8
simonjp Tetrode Join Date: Sep 2014 Location: Lewes, East Sussex, UK. Posts: 55	Re: Racal RA1772 help Hi gents Panic over. Due to a total ignorance on my behalf and having not RTFM, and a lack of understanding of the layout, had a knee jerk reaction and assumed that the missing pcb was the issue. The pcb was the isb pcb, so last night I spent much time reading about this new variant of dsb. So without the isb/audio board is no problem. After cleaning the mode switch and Mhz change switch and applying some nyogel 760 grease, the radio has sprung into life. The speaker pops a bit but with cans on its fine. Just need to get an understanding of filters now, which dont seem to do very much. Anyway, considerable progress if a little egg on the face. Thanks everyone. Now I just need to get to the display logic and make an interface using a PIC and a look up table to drive the MA1720 in transceiver mode. ( winter project)