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 Post subject: Not necessarily antique, but close-scanning
PostPosted: Apr Thu 22, 2021 4:34 pm 
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Joined: Apr Thu 22, 2021 4:27 pm
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I would like to make a circuit that scans both the AM, and FM dial, from the lowest frequency, to the highest frequency on any radio. The speed should be adjustable.
Any ideas?? :lol:
Thanks in advance
PS. this is not necessarily a antique radio question, but this is the only forum I could find to ask this.


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 Post subject: Re: Not necessarily antique, but close-scanning
PostPosted: Apr Thu 22, 2021 6:09 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1715
Location: Wayside, NJ Monmouth
Could program an Arduino to run a servo motor to tune back an forth.


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 Post subject: Re: Not necessarily antique, but close-scanning
PostPosted: Apr Fri 23, 2021 4:19 am 
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Location: Texas
Do you want it to stop at each station? How strong? How long? Or just scan up and down continuously like Knight Riders lights?

I'd start with applying a voltage-controlled oscillator to a direct conversion receiver.

Oh, you said any radio. EBay and maybe Amazon sell motorized volume controls that are controlled by remote control and consists of a stepping motor that is physically connected to a potentiometer. You could disconnect the potentiometer from the motor pulley and instead connect the motor pulley to the tuning knob of your radios. Something that simple would not pause at each station.


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