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Old 29th Apr 2019, 9:28 pm   #1
Avid_Nerdlinger
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Join Date: Apr 2019
Location: Durness, Sutherland, UK.
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Default Simple amplitude modulator for radio alignment.

I'm starting to think about building an audio signal generator and mixer. My TG102 signal generator (0 - 2MHz) has a sweep input which might be useable for FM but nothing for AM.

I can't find any cheap Chinese things I can buy off the shelf nor can I find a likely project in this or other forums. My skills are rusty (they were never that shiny) so I might be missing the right search terms. Can anyone point at an existing solution or a cheap product?
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Old 29th Apr 2019, 10:13 pm   #2
paulsherwin
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Default Re: simple amplitude modulator for radio alignment

The easiest solution is to use software on a computer or smartphone.

e.g. https://play.google.com/store/apps/d...pqd1fAP6OWEuAY
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Old 30th Apr 2019, 2:30 pm   #3
Avid_Nerdlinger
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Default Re: Simple amplitude modulator for radio alignment.

Nice app thanks. I've been looking at TG102's schematic and I'm now wondering about modulating it by injecting a sine wave at the output level potentiometer. There doesn't seem to be any heavy load or filtering there. I could test it with that app on my phone but I've just ordered a Chinese function generator kit for 1.44...
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Old 30th Apr 2019, 3:15 pm   #4
MrBungle
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Default Re: Simple amplitude modulator for radio alignment.

TG102 isn't exactly going to be a stable signal source for that sort of stuff. They drift around all over the place. Might be worth doing things about face and building a little transmitter such as the ludens one here and using the TG102 as the modulation source for it:

https://ludens.cl/Electron/amtx/amtx.htm
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