Re: weak radio reception. trying to fix. SONY ICF-CD523

I don't know the input impedance. My schematic above shows what I'm dealing with.
FM Chip, 26Ω resistor, a band pass filter, cap...and wire.
Is there a generic or safe value we can use for the average consumer radio?

Re: weak radio reception. trying to fix. SONY ICF-CD523

in doing some research, is a dipole antenna worth trying?
I see some for 100.5MHz... which is the station I want to improve. But these antenna's have two wires. Would I ground one? Or is this antenna totally wrong. :O

Re: weak radio reception. trying to fix. SONY ICF-CD523

I know I can't just run wire all over the place. I read a post on this forum where a guy ran 6.3 feet of wire for an antenna on a similar sony radio. I hooked up 8 feet of wire. Installed the radio where it belongs.... and then started cutting back on the wire until it sounded good. I'm at less than 2 feet. I'll look at that post... and do some research.

Re: weak radio reception. trying to fix. SONY ICF-CD523

Well,, I read through that tech manual. Thats great stuff. Lots of detail.
I don't have the equipment to do the FM test...
Is there anything else I cantest or try???

Re: weak radio reception. trying to fix. SONY ICF-CD523

For sure.... thats why I cut that feed, and ran my own wire.
It impoved things.... but the odd station is wacky.

Hey all,
I've got this SONY Under Cabinet Radio. Model # ICF-CD523.
Over the years the FM reception has really gone down hill. I would like to try and fix this. I opened up the radio and found the FM Chip CXA1960Q. From Pin #18 we go through a 26Ω resistor (R6) and then it goes out to a BPFI (GFWE2 SE). The input of this 3 pin device is fed from a cap (C953, 200pF).
The other side of this cap goes to the secondary side of the step down transformer. So basically they are using the power cord as an antenna (as it is well known).

I checked the resistor and...

Re: New Members - please post your introductions here

Good day all, Bob Here. Graduated from Fanshawe many years ago. Diploma's in Electrical, Controls Engineering & Robotics. (5 long years of school).
I am working in my field and loving it. Some medical... but mostly defense control systems and a few [I][U]other[/U][/I] cool things under that umbrella.

I've come across many posts on here WRT radios. Great stuff... Looking for some help!
And hopefully I too can contribute too.
BobRe: New Members - please post your introductions here