Best germanium diode for FM detector - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

PaulR · 19th Sep 2011, 6:54 pm

This thread seems to be becoming specific to my C&S set so maybe it should be merged with my original enquiry about it. https://www.vintage-radio.net/forum/...ad.php?t=71729

Anyway, I think that the resistor in question is R22 on here http://www.portabletubes.co.uk/boats/amunit2.JPG which measures 119K as opposed to 100k. The concern was that this might have gone low rather than high. Might replacing it actually make things worse? The capacitors are a little hard to get at so I haven't disturbed them yet.

Paul

John_BS · 19th Sep 2011, 8:17 pm

Hf distortion on FM is most commonly associated with multipath. Have you tried moving the antenna?
John

ENGLISH VICTOR · 23rd Sep 2011, 1:21 pm

Yes Dave of course you are correct it was a typo on my part. Having spent some considerable time in the broadcast industry I do know the difference between pre and de emphasis and where they are employed. I must be more careful in future.
Regards Victor.

19th Sep 2011, 6:54 pm	#21
PaulR Dekatron Join Date: Oct 2003 Location: Southport Lancashire, UK. Posts: 3,236	Re: Best germanium diode for FM detector This thread seems to be becoming specific to my C&S set so maybe it should be merged with my original enquiry about it. https://www.vintage-radio.net/forum/...ad.php?t=71729 Anyway, I think that the resistor in question is R22 on here http://www.portabletubes.co.uk/boats/amunit2.JPG which measures 119K as opposed to 100k. The concern was that this might have gone low rather than high. Might replacing it actually make things worse? The capacitors are a little hard to get at so I haven't disturbed them yet. Paul

19th Sep 2011, 8:17 pm	#22
John_BS Octode Join Date: Dec 2008 Location: Wincanton, Somerset, UK. Posts: 1,782	Re: Best germanium diode for FM detector Hf distortion on FM is most commonly associated with multipath. Have you tried moving the antenna? John

23rd Sep 2011, 1:21 pm	#23
ENGLISH VICTOR Hexode Join Date: Feb 2008 Location: Sydney, Australia Posts: 356	Re: Best germanium diode for FM detector Yes Dave of course you are correct it was a typo on my part. Having spent some considerable time in the broadcast industry I do know the difference between pre and de emphasis and where they are employed. I must be more careful in future. Regards Victor.