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#1
July 11th 06, 12:09 AM
posted to rec.radio.scanner
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Fisher Price 157 Baby Monitor AGC Defeat
Did it years ago and never documented it. Anyone ?????
Thanks Pancake |
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#2
July 11th 06, 02:40 AM
posted to rec.radio.scanner
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Fisher Price 157 Baby Monitor AGC Defeat
On Mon, 10 Jul 2006 19:09:17 -0400, pancake
wrote: Did it years ago and never documented it. Anyone ????? Probably just lift the AGC diode. But why? |
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#3
July 12th 06, 11:04 AM
posted to rec.radio.scanner
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Fisher Price 157 Baby Monitor AGC Defeat
On Mon, 10 Jul 2006 21:40:25 -0400, Al Klein
wrote: On Mon, 10 Jul 2006 19:09:17 -0400, pancake wrote: Did it years ago and never documented it. Anyone ????? Probably just lift the AGC diode. But why? I Prefer constant levels, Thanks Pancake |
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#4
July 12th 06, 01:32 PM
posted to rec.radio.scanner
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Fisher Price 157 Baby Monitor AGC Defeat
On Wed, 12 Jul 2006 06:04:33 -0400, pancake
wrote: On Mon, 10 Jul 2006 21:40:25 -0400, Al Klein wrote: On Mon, 10 Jul 2006 19:09:17 -0400, pancake wrote: Did it years ago and never documented it. Anyone ????? Probably just lift the AGC diode. But why? I Prefer constant levels, Which is what AGC gives you. Without it you get constant gain, but varying levels. |
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#5
July 13th 06, 02:59 AM
posted to rec.radio.scanner
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Fisher Price 157 Baby Monitor AGC Defeat
On Wed, 12 Jul 2006 08:32:06 -0400, Al Klein
wrote: On Wed, 12 Jul 2006 06:04:33 -0400, pancake wrote: On Mon, 10 Jul 2006 21:40:25 -0400, Al Klein wrote: On Mon, 10 Jul 2006 19:09:17 -0400, pancake wrote: Did it years ago and never documented it. Anyone ????? Probably just lift the AGC diode. But why? I Prefer constant levels, Which is what AGC gives you. Without it you get constant gain, but varying levels. Perhaps I was incorrect in calling it AGC, the data sheet on the chip calls it ALC . Regardless, it sucks up unwanted noise from the audio. |
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#6
July 13th 06, 01:32 PM
posted to rec.radio.scanner
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Fisher Price 157 Baby Monitor AGC Defeat
On Wed, 12 Jul 2006 21:59:19 -0400, pancake
wrote: Perhaps I was incorrect in calling it AGC, the data sheet on the chip calls it ALC . Regardless, it sucks up unwanted noise from the audio. Sounds like a squelch control. It turns the audio off if there's just background noise? There's something being fed to that pin on the chip. Either ground the pin or connect it to the positive rail - one or the other is effectively "off" for the function. If you have a voltmeter, just check which way the voltage goes to cut off the audio - you want the other voltage on it constantly. |
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