HFU HF Underground
Technical Topics => Part 15 AM and FM Station Operation => Topic started by: ChrisSmolinski on January 18, 2020, 1150 UTC
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$24 shipped from Thailand: https://www.ebay.com/itm/531-to-1602-kHz-Low-power-AM-PLL-transmitter-kit-for-learning/153799136672
It includes crystals for both 9 and 10 kHz channel spacing. From a review I read elsewhere, it puts out about 70 mW, and goes up to 1710 kHz.
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NEAT!!!! And, if you want to build a Part #15 compliant antenna for this, Bob at MRAM1500, shows how to do this. http://mram.us/AntennaStory.htm
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Bummer, says listing has ended.
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This seller restocks this item often so check back in a week or so.
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This seller restocks this item often so check back in a week or so.
And there it is: https://www.ebay.com/itm/531-to-1602-kHz-Low-power-AM-PLL-transmitter-kit-for-learning/153801485438
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But beware. Output amplifier operates in Class C. Don't think about amplifying this thing
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It has 3 switch selectable low pass filters after the final. Amplify then high level modulation would be the way to go if you wanted more power.
~
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The 'way to go' would be to buy a proper transmitter in the first place!
I don't get this Part 15 thing?
70mW and you're trying to amplify it...why bother?
I ask you!
;)
Str.
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The 'way to go' would be to buy a proper transmitter in the first place!
I don't get this Part 15 thing?
70mW and you're trying to amplify it...why bother?
I ask you!
;)
Str.
Some people want to run a legal Part 15 transmitter, to cover a small area, un-amplified. You're allowed 100 mW and a 3 meter antenna, so 70 mW is legal. Avoids getting The Knock :)
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It is actually a cool little oscillator. Got mine in kit form a few years ago and it worked a charm. Check out..
https://www.amateurradioshop.nl/webshop/bouwkits/hf/detail/41/am-pll-middengolf-oscillator-bouwkit.html
Or just build your own. http://www.tompolk.com/radios/frequencysynthesizer/freqsynth.html
There are a lot more schematics floating about for this. Must dig them out.
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I bought (and received) one of these kits from E-Bay. Unfortunately, no schematic was provided with the kit. Does anyone have a link to a good schematic, pdf, etc?
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Cancel that. I think this is the correct schematic: https://drive.google.com/file/d/12Yjb3Vw2Dr0Qa4AUOGLJELPkQlfi7KyV/view
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NEAT!!!! And, if you want to build a Part #15 compliant antenna for this, Bob at MRAM1500, shows how to do this. http://mram.us/AntennaStory.htm
It seems that url just needs the "WWW" to work: http://www.mram.us/AntennaStory.html
I also ran across some related sites 8)
https://vk.com/realfreeradio
https://mbcf.boards.net/thread/315/question-mram-1500
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While you're on this Part 15 kick, here's another site, http://boomerthedog.net/radio.html
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While you're on this Part 15 kick, here's another site, http://boomerthedog.net/radio.html
Thanks for that link! I really liked the low power AM transmitter in a box.
(http://boomerthedog.net/images/chez-uncovered-sm.jpg)
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I got one of those Greek C-QUAM transmitters recently and will be doing a youtube video on it soon with partial stereo proof-of-performance measurements. Its based largely on the Chris Cuff design.
+-RH
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Thought I'd chime in... I bought this kit from eBay recently.
I''ll start by saying that I've actually designed and built several non-radio kits for my own business. I was unable to get this one running.
Engrish aside, the design is very interesting and easy to understand. 4 parts were missing, including a couple "irritating" to fine.
Once I sorted everything, I had a spot-on carrier with no modulation. I troubleshot the obvious culprits for a day, and them binned it.
I have no doubt that the design is worth the money, but missing parts from an overseas shipper suggests a certain level of "I don't care."
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Why run pt. 15 ? Well I do but I live in a heavily concentrated area home wise that is... I use AM and FM and well let's see 8 5 unit apartments equals 40 + listeners... and that doesn't include the folks across the road, mostly older like myself but so many of us luv 'old radio shows'... brings back memories of when we were much younger... :-)
have a great day and a better tomorrow :-)
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The eBay kit referred to in the original post on this thread has been out of stock for a while now. I messaged the seller to ask if he will be selling it again. He replied that the airlines in his country (Thailand) are not operating because of the COVID-19 situation and, therefore, he cannot sell his products.
Hopefully, it will be back in stock at some point in the future.