Panasonic Table AM/FM Radio Model RF 544
By Horner - usenet poster
Hello all,
I have the the above mentioned radio. Though the audio sounds
great during the day, (Must have quite a good AF bandwith)
At night the problem of 9Khz whistle raises it ugly head.
Anybody got an idea to modify the radio (switchable) to
narrow its bandpass so that I can more enjoy listening at night?.
Regards,
Mitchell
Solution #1
posted on Aug 10, 2005
Jimmy NY - usenet poster
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Thanks Phil. Doesn't seem to hard to make up. I'll delete the switch as far
as the notch
select is concerned. Now where did I put that veroboard :)
The only other pain in the but is radio 2 (1611KHz) which I can here softly
in the background
spaced apart at the IF frequency (455KHz).
Guess I can't really get rid of that because the TX site is only about 1 KM
away
Cheers,
Mitchell
as the notch
select is concerned. Now where did I put that veroboard :)
The only other pain in the but is radio 2 (1611KHz) which I can here softly
in the background
spaced apart at the IF frequency (455KHz).
Guess I can't really get rid of that because the TX site is only about 1 KM
away
Cheers,
Mitchell
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Solution #2
posted on Aug 10, 2005
Hart - usenet poster
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On Sat, 21 Feb 2004 09:43:58 GMT, "Mitchell McCreath"
Hello Mitchel,
For fun, in addition to the notch filter you could add a simple manual
RF gain control. Find the AGC line and with a suitable potentiometer
resistor arrangement (trimpots either side of the control pot) alter
the AGC voltage slightly.
You could fit a 3 position switch to have.
Normal AGC (original circuit without mod)
Manual RF gain no AGC
Manual RF gain with AGC
Easy to do with a signal generator to help you but
you could just muck about without one just for fun.
I am assuming you have a circuit diagram for your
radio, if you can't get one easily and cheaply then
forget my suggestion.
Regards,
John Crighton
Sydney
Hello Mitchel,
For fun, in addition to the notch filter you could add a simple manual
RF gain control. Find the AGC line and with a suitable potentiometer
resistor arrangement (trimpots either side of the control pot) alter
the AGC voltage slightly.
You could fit a 3 position switch to have.
Normal AGC (original circuit without mod)
Manual RF gain no AGC
Manual RF gain with AGC
Easy to do with a signal generator to help you but
you could just muck about without one just for fun.
I am assuming you have a circuit diagram for your
radio, if you can't get one easily and cheaply then
forget my suggestion.
Regards,
John Crighton
Sydney
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Solution #3
posted on Aug 10, 2005
Chandler - usenet poster
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Don't know about that model, but in general you could make a 9kHz notch
filter out of one or two op-amps. Then wire it into the receiver near the
volume control connections.
Peter
filter out of one or two op-amps. Then wire it into the receiver near the
volume control connections.
Peter
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Solution #4
posted on Aug 10, 2005
Gary10 - usenet poster
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"Mitchell McCreath" <mmou @bigpond.net.au>
** This site should give you a few ideas.
http://www.geocities.com/rbruc ecarter/amaudio.htm
........... Phil
** This site should give you a few ideas.
http://www.geocities.com/rbruc ecarter/amaudio.htm
........... Phil
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