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 Post subject: 455KHz IF oscillator with only three parts
PostPosted: May Sat 14, 2022 8:06 pm 
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Joined: Mar Thu 01, 2018 1:30 am
Posts: 1018
Anybody willing to test this circuit? I don't have a three pin ceramic resonator.


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 Post subject: Re: 455KHz IF oscillator with only three parts
PostPosted: May Sat 14, 2022 9:34 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 5580
Location: Texas
Where did you get this? I suspect that I'm the inventor of that circuit. I came up with it on my own and I've never seen it anywhere else on the web. Here's my original published version.

http://www.tompolk.com/inventions/455_K ... lator.html

Really curious where you got it.

It works. Battery voltage is critical and variable with each sample of device.


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 Post subject: Re: 455KHz IF oscillator with only three parts
PostPosted: May Sat 14, 2022 10:30 pm 
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Joined: Mar Thu 01, 2018 1:30 am
Posts: 1018
Macrohenry wrote:
Where did you get this? I suspect that I'm the inventor of that circuit. I came up with it on my own and I've never seen it anywhere else on the web. Here's my original published version.

http://www.tompolk.com/inventions/455_K ... lator.html

Really curious where you got it.

It works. Battery voltage is critical and variable with each sample of device.


Is that so? Wow, cool! A friend of mine send me the same schematic in mail. It wasn't downloading to my phone so I had to redraw it.


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 Post subject: Re: 455KHz IF oscillator with only three parts
PostPosted: May Sat 14, 2022 10:35 pm 
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Joined: Mar Thu 01, 2018 1:30 am
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On a side note, are you a programmer as well? I'm talking about microcontrollers and HEX codes, a PIC series microcontroller is going to drive a CD4046 + LCD + take inputs from four keys to cover the 87.5-108 MHz band in 100KHz steps. A obsolete dedicated PLL chip like TSA5511 isn't needed then. The microcontroller is directly able to control CD4046.


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 Post subject: Re: 455KHz IF oscillator with only three parts
PostPosted: May Sat 14, 2022 11:27 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 5580
Location: Texas
Dare4444 wrote:
On a side note, are you a programmer as well?


I could call myself a programmer if I could call myself a brain surgeon. I can program a VCR and adapt Arduino code to my purposes, but starting from scratch? Nopers.


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 Post subject: Re: 455KHz IF oscillator with only three parts
PostPosted: Jun Tue 14, 2022 10:36 am 
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Joined: May Thu 07, 2015 3:43 pm
Posts: 6
You could use a 432Kcps xtal in series with a 30p cap to tune the tx above and below 455.
This for the reception of usb , lsb , cw .
maxeq


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 Post subject: Re: 455KHz IF oscillator with only three parts
PostPosted: Jun Thu 23, 2022 2:01 pm 
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Joined: May Wed 22, 2013 6:58 pm
Posts: 59
Location: Cincinnati, Ohio
The main idea was published in the British mag. "Electronics World" in 2001, Sept.


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 Post subject: Re: 455KHz IF oscillator with only three parts
PostPosted: Jun Thu 23, 2022 5:22 pm 
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Joined: May Thu 07, 2015 3:43 pm
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could it work , something like this?
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ElectronicsWorld2001SeptEW_minimal_455.png
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