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

steve1811uk · 21st Mar 2006, 10:34 am

I have got a R200 and have aligned the MW band the best I can.

I used broadcast stations Capital Gold 1458kHz (set scale to 206m) and RTE 567 kHz (set scale to 529m). I am very happy with the allignment and sensitivity on MW. However when I switch to long wave I find the sensitivity is very poor. I don't have a signal generator only a scope to hand so the only adjustment I could make was to the LW local oscillator trim cap. I adjusted this to get local oscillator range of 630 kHz to 745 kHz which I think is correct.

I believe the capacitor on the tuning rod is the wrong value. It is a small silver rolled polystyrene type (looks modern) and is unlikely to be the correct value of 40pF. Do you think this is the original part ? I aim to replace this with 40 pF or replace with a trim cap and adjust. I need some help with the tuning scale as I can only align on a broadcast station. The longwave scale is not marked with wavelength.

Can anyone tell me two strong stations to align to. Where on the MW tuning scale do they appear ? Any help appreciated. Steve

21st Mar 2006, 10:34 am	#1
steve1811uk Retired Dormant Member Join Date: Mar 2006 Location: Manchester Posts: 33	Roberts R200 LW reception poor I have got a R200 and have aligned the MW band the best I can. I used broadcast stations Capital Gold 1458kHz (set scale to 206m) and RTE 567 kHz (set scale to 529m). I am very happy with the allignment and sensitivity on MW. However when I switch to long wave I find the sensitivity is very poor. I don't have a signal generator only a scope to hand so the only adjustment I could make was to the LW local oscillator trim cap. I adjusted this to get local oscillator range of 630 kHz to 745 kHz which I think is correct. I believe the capacitor on the tuning rod is the wrong value. It is a small silver rolled polystyrene type (looks modern) and is unlikely to be the correct value of 40pF. Do you think this is the original part ? I aim to replace this with 40 pF or replace with a trim cap and adjust. I need some help with the tuning scale as I can only align on a broadcast station. The longwave scale is not marked with wavelength. Can anyone tell me two strong stations to align to. Where on the MW tuning scale do they appear ? Any help appreciated. Steve Last edited by Darren-UK; 18th Jul 2007 at 12:16 am. Reason: General tidying.