"It's pretty easy with a high quality sound card. You'll need JavaSound and basic knowledge of bitrate, amplitude, pulsewidth (e.g. 44.1Khz). Just do the math and send out an array of non-zero values on the outputbuffer. You can verify your…"
Matt's Discussions
JAVA -- Generate PPM/PWM Signals -- How To
Started this discussion. Last reply by Cliff-E May 31, 2012. 1 Reply 0 Likes
Good Afternoon! I need some help with a personal project, below is what I'm trying to achieve. What I'd like to do: 1) Capture input from a Joystick or other USB devices. 2) Convert the input into…Continue
How to determine Legality of Frequency & TX power
Started this discussion. Last reply by David Jan 18, 2012. 6 Replies 0 Likes
Community: I have called the FCC to be transferred 3 times and then finally transferred to a voice-mail with no answer.I want to know which document(s) I can look at to determine the legal…Continue
Design & Build Custom tx and rx
Started this discussion. Last reply by Jake Stew Mar 2. 10 Replies 0 Likes
Hello! I'm interested in designing and building my own custom tx and rx from scratch. Although, my electronics (circuits) skills are not quite up to par with this. (Started with computer science…Continue
Matt's Page
Latest Activity
Matt posted a discussionJAVA -- Generate PPM/PWM Signals -- How To
Good Afternoon! I need some help with a personal project, below is what I'm trying to achieve. What I'd like to do: 1) Capture input from a Joystick or other USB devices. 2) Convert the input into a PPM signal that can be output through a USB cable. 3) Create a USB to Stereo cable adapter. I'm pretty sure there are libraries I can use to capture the input, so I'm not terribly worried about # 1 yet. But what I cannot find on google is how to generate a PPM/PWM signal and then output it via…See More
David replied to Matt's discussion How to determine Legality of Frequency & TX power"I'd suggest serious caution before adopting this approach. In my experience with the amateur radio community (I'm a licensed operator), HAM operators start the enforcement process with the FCC through a report filed with the…"
Dr Gary L Snyder replied to Matt's discussion How to determine Legality of Frequency & TX power"Look at the licensing requirements for the various ham operators licenses.
Doc"
Kevin Mahler replied to Matt's discussion How to determine Legality of Frequency & TX power"Getting a Ham License will not only open up new frequencies and power options but, will teach you a great deal more about RF, tx/rx and antennas.
Or, you could just do what you want and wait for the FCC to call you. ;)
"
Matt replied to Mike G's discussion FAA and UAV vs FPV"I think this pretty much lays out the law: http://www.faa.gov/about/initiatives/uas/media/UAS_FACT_Sheet.pdf
Basically, I don't think they will go after you in-less you piss them off or they need to make an example of you. (at least…"
David replied to Matt's discussion How to determine Legality of Frequency & TX power"Frequency allocation can be found in this FCC doc: http://transition.fcc.gov/oet/spectrum/table/fcctable.pdf, which contains info on which subsection to refer to for a given frequency.
Tx power (more importantly ERP) and other restrictions are…"
David Kovar replied to Matt's discussion How to determine Legality of Frequency & TX power"Greetings,
'tis a good question. You might try asking the ARRL (national association for amateur radio - http://www.arrl.org/).
-David
"
Matt posted a discussionHow to determine Legality of Frequency & TX power
Community: I have called the FCC to be transferred 3 times and then finally transferred to a voice-mail with no answer.I want to know which document(s) I can look at to determine the legal issues/restrictions for using a given frequency with a specific tx power. Also, any restrictions such as video only, not allowed to encrypt ...etcThanks!See More
Matt replied to Matt's discussion Design & Build Custom tx and rx"I'm 100% interested. I sent you a PM with my email address."
Matt replied to Matt's discussion Design & Build Custom tx and rx"That is correct Allen. I'm Finishing up a degree in Professional Aeronautics and starting on Electrical Engineering - so I want to get a head start by doing a mini project like this. This is strictly for educational purposes.
Thank you…"
Allen Babb replied to Matt's discussion Design & Build Custom tx and rx"My replies where under the assumption that the OP was going to try making his own transmitter and reciever radio from scratch, which I see now is not what what he was referring to when he said "Tx" and "Rx".
I…"
Jake Stew replied to Matt's discussion Design & Build Custom tx and rx"> you'll have to comply with FCC rules... which boils down to a very limited range and can only do AM transmissions.
Please elaborate on that... What's to stop a 433mhz ISM band radio on a chip that puts out 100mw (1W…"
Jake Stew replied to Matt's discussion Design & Build Custom tx and rx"I have the same project planned. Might have a little more electronics experience.
If you've checked out the OpenLRS…"
AdminThomas J Coyle III replied to Matt's discussion Design & Build Custom tx and rx
"Matt,
You might want to take a look at this thread to get an idea of what it takes to build a custom TX/RX combo: http://www.lynxmotion.net/viewtopic.php?f=21&t=4399
I presently have several of the PCTx interfaces and am investigating…"
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