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I posted this in a comment already so you can ignore that if you want. Depending on the output of your AV to RF converter you might need something else. The ones that I have all have a coaxial output. You can get some of these to go on the end of the coax cable and plug it into the 'ext ant' on the back.
I have a similar set. I bought this 3.5mm to COAX adapter on Amazon for like $8
[F Type Female to 1/8" 3.5mm Male Mono Plug Jack Adapter Coupler Converter
I then plugged that into a RadioShack RF modulator I had lying around that took the coax and adapted it to S-Video
Yes! I own a BiSider and use it often. I do it a few ways, but mos frequently convert the image into coax and use one of these guys to plug into the Ext Antenna jack.
I'm much younger than this set, so maybe not the best resource, but I believe that's just and RF input and something like this would let you plug any regular RF adapter for like an NES into it and play.
You can buy a 3.5mm (male) to coax (female) adapter and then add an RF modulator.
However, does that TV also have an FM radio? Then that input may only be for FM radio and not for an external TV antenna.
You'll need one of These adapters to plug into the EXT ANT port. (Search for "3.5mm to F" or "3.5mm to coax" - I just grabbed the first link that came up)
You'll be able to get anything that outputs an RF signal into it from there -- Unfortunately it's the worst signal you can throw at it, but on a screen that small it won't matter as much. If you don't have anything that has a native RF output, you can also pick up an RF modulator which will take composite video and give you an RF output as well.
Composite converted to Coax, which is then converted to 3.5mm. How I was able to hook up my DVD player and composite systems to a Sony TV-511E.
I wonder if something like this might work? It's got an audio plug on one end and a female coax adapter on the other, which you could connect to a 75-ohm like this. Or maybe just get like a male-female 75 ohm transformer and then connect it to your antenna via coax? Or however.
Anyway, the phone jack type connector should hopefully at least enable you to make the signal from an antenna or other video source available to the Quasar.
One of these, rf only. https://www.amazon.com/Fancasee-Adapter-Coupler-Converter-Connector/dp/B07R3B2Q38
Just popped in to let you know that these exist. Though I will never not be a fan of making it work with the stuff you already have lying around.
That makes sense.
That should work, right?
Thanks very much for your help.
Here's something that might interest you.
These exist all over the place, just hook a coax to the output of your modulator and plug the other end into the 3.5 jack
I have that exact TV. You need this to plug into that 3.5mm jack so you can use a regular coax cable.
From there you can use any RF modulator (The one in your post should work just fine).
If you're planning on watching OTA channels, the days of analog are long gone. You'll need a Digital Converter Box to take in the now-digital OTA signals and output something the vintage TV can understand. The one I linked to has RF out so you can plug that right into the above adapter and straight into the TV.
If you have something composite or above you'll need to convert down to RF. For composite, an RF modulator like the one you linked will work just fine.
For HDMI you can buy cheap HDMI to Composite adapters and then take the same Composite to RF modular approach, but honestly I'd recommend against this. Unless you buy very expensive scaling hardware or plug it into a computer and specifically output 640x480 you'll end up with a squashed image.
The first item I saw in an amazon search. There's probably cheaper options if you do more searching.
Grab one of these and a DTA box and enjoy wheel of fortune in glorious 5" B&W
3.5mm to F adapter https://www.amazon.com/Fancasee-Adapter-Connector-Coupler-Converter/dp/B07R3B2Q38/ref=sr_1_6?keywords=3.5mm+f&qid=1561191012&s=gateway&sr=8-6
Or use belling-lee or whatever other connector is convenient.