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

steve1811uk · 21st Mar 2006, 12:05 pm

Darren, I have the early version serial number 8304. The cap should be 40 pF but I think it has been changed as it is a silver polystyrene tubular type and looks modern. I aim to replace this cap with a fixed and variable cap in parallel. I will then adjust this cap to allign as I already adjusted the local oscillator to run at the correct frequency (630 kHz to 745 kHz) using a callibrated digital scope.

I can receive radio 4 but in order to do the LW alignment I need to know where it should appear on the tuning scale. The LW scale is not marked with wavelength. My specific question is this, when tuned to Radio 4 LW what is the reading on the MW scale ? The ferrite rod seems OK and the LW coil has not moved.

Hope someone can help. Steve.

21st Mar 2006, 12:05 pm	#3
steve1811uk Retired Dormant Member Join Date: Mar 2006 Location: Manchester Posts: 33	Re: Roberts R200 LW reception poor Darren, I have the early version serial number 8304. The cap should be 40 pF but I think it has been changed as it is a silver polystyrene tubular type and looks modern. I aim to replace this cap with a fixed and variable cap in parallel. I will then adjust this cap to allign as I already adjusted the local oscillator to run at the correct frequency (630 kHz to 745 kHz) using a callibrated digital scope. I can receive radio 4 but in order to do the LW alignment I need to know where it should appear on the tuning scale. The LW scale is not marked with wavelength. My specific question is this, when tuned to Radio 4 LW what is the reading on the MW scale ? The ferrite rod seems OK and the LW coil has not moved. Hope someone can help. Steve. Last edited by Darren-UK; 18th Jul 2007 at 12:18 am. Reason: General tidying.