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	<title>Comments on: 200 mile RF transmitter (and high altitude balloon)</title>
	<atom:link href="http://hackaday.com/2010/07/27/200-mile-rf-transmitter-and-high-altitude-balloon/feed/" rel="self" type="application/rss+xml" />
	<link>http://hackaday.com/2010/07/27/200-mile-rf-transmitter-and-high-altitude-balloon/</link>
	<description>Fresh hacks every day</description>
	<lastBuildDate>Sun, 12 Feb 2012 02:22:53 +0000</lastBuildDate>
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	<item>
		<title>By: sharx</title>
		<link>http://hackaday.com/2010/07/27/200-mile-rf-transmitter-and-high-altitude-balloon/comment-page-1/#comment-325398</link>
		<dc:creator><![CDATA[sharx]]></dc:creator>
		<pubDate>Sun, 06 Feb 2011 19:14:40 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=26513#comment-325398</guid>
		<description><![CDATA[my project is to communicate with two computers over RF but thanks for this it is helpful and if you can help me connect it to computer i will be much great full. thanks alot]]></description>
		<content:encoded><![CDATA[<p>my project is to communicate with two computers over RF but thanks for this it is helpful and if you can help me connect it to computer i will be much great full. thanks alot</p>
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		<title>By: Alan Parekh</title>
		<link>http://hackaday.com/2010/07/27/200-mile-rf-transmitter-and-high-altitude-balloon/comment-page-1/#comment-164090</link>
		<dc:creator><![CDATA[Alan Parekh]]></dc:creator>
		<pubDate>Sat, 31 Jul 2010 04:15:29 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=26513#comment-164090</guid>
		<description><![CDATA[Love the simple transmitter design!]]></description>
		<content:encoded><![CDATA[<p>Love the simple transmitter design!</p>
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		<title>By: lwatcdr</title>
		<link>http://hackaday.com/2010/07/27/200-mile-rf-transmitter-and-high-altitude-balloon/comment-page-1/#comment-163389</link>
		<dc:creator><![CDATA[lwatcdr]]></dc:creator>
		<pubDate>Thu, 29 Jul 2010 15:10:57 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=26513#comment-163389</guid>
		<description><![CDATA[@scott
What I was suggesting was to use your system to send the GPS signal to a ground station that would then use that date to point the 900mhz dish. That way if you lost the connection with the 900mhz for some reason it might be possible to reacquire the signal with little effort.
All you would need on the ground station is a GPS module and a compass module. You could even mount it on a car or pickup truck and have a mobile ground station.
I have been thinking of doing something like that with a wifi data link using an old echostar dish. The problem I had was if for some reason the dish lost lock it would have a hard time getting it back. With your transmitter I would have a good long range data source to use for dish pointing.]]></description>
		<content:encoded><![CDATA[<p>@scott<br />
What I was suggesting was to use your system to send the GPS signal to a ground station that would then use that date to point the 900mhz dish. That way if you lost the connection with the 900mhz for some reason it might be possible to reacquire the signal with little effort.<br />
All you would need on the ground station is a GPS module and a compass module. You could even mount it on a car or pickup truck and have a mobile ground station.<br />
I have been thinking of doing something like that with a wifi data link using an old echostar dish. The problem I had was if for some reason the dish lost lock it would have a hard time getting it back. With your transmitter I would have a good long range data source to use for dish pointing.</p>
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		<title>By: Scott</title>
		<link>http://hackaday.com/2010/07/27/200-mile-rf-transmitter-and-high-altitude-balloon/comment-page-1/#comment-163226</link>
		<dc:creator><![CDATA[Scott]]></dc:creator>
		<pubDate>Thu, 29 Jul 2010 03:00:10 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=26513#comment-163226</guid>
		<description><![CDATA[@lwatcdr - no need to use the 900mhz dish. I&#039;d just send GPS data directly using FSK (frequency shift keying) to send the coordinates. Having a microcontroller send RTTY (radio teletype) also seems easy! There are so many possibilities...

@Drew - I can see you&#039;ve got a lot of energy! That&#039;s awesome. In a nutshell:

1.) Don&#039;t limit yourself to the lowest radio amateur license (&quot;technician&quot;). Yeah it&#039;s a start, but go ahead and get the 2nd level (&quot;general&quot;), then you can use any amateur band (the lower regions of which are reserved for the highest-level licensees) and have the whole spectrum at your fingertips.

2.) Begin reviewing the material to get your radio license. You&#039;ll learn about all the operating modes (SSB, FM, AM, CW), frequencies, and much more! It&#039;ll give you a better idea of what&#039;s used for what and why, such as why video is best sent on higher frequencies (i.e., 900MHz) and why *continuous wave* (CW) like what I used in this project is so good for low power transmission of Morse code!

3.) Controlling an RC plane 200 miles away would definitely require something more sophisticated, but not outside the realm of hobbyists! Again, read the exam prep material! IMHO the best way is to read the question bank and Google why an answer is what it is if you don&#039;t get it.

4.) depending on where you live, you probably have an active VHF repeater within range. Think of it as an IRC server for local radio operators. Once you get on the air with an inexpensive VHF radio (I started with a $65 Puxing 777 from eBay) you&#039;ll meet a lot of people on the air who can help you learn a ton just by talking to them, and probably even let you borrow equipment of your own until you know what you want to buy! Similar to how computer gurus have tons of old computers in a closet somewhere, a lot of radio gurus have tons of old equipment they&#039;d be happy to lend out to an eager learner!

Get that license and make some contacts =o)

Once you have a working knowledge of major RF concepts, the world is yours for the hacking!]]></description>
		<content:encoded><![CDATA[<p>@lwatcdr &#8211; no need to use the 900mhz dish. I&#8217;d just send GPS data directly using FSK (frequency shift keying) to send the coordinates. Having a microcontroller send RTTY (radio teletype) also seems easy! There are so many possibilities&#8230;</p>
<p>@Drew &#8211; I can see you&#8217;ve got a lot of energy! That&#8217;s awesome. In a nutshell:</p>
<p>1.) Don&#8217;t limit yourself to the lowest radio amateur license (&#8220;technician&#8221;). Yeah it&#8217;s a start, but go ahead and get the 2nd level (&#8220;general&#8221;), then you can use any amateur band (the lower regions of which are reserved for the highest-level licensees) and have the whole spectrum at your fingertips.</p>
<p>2.) Begin reviewing the material to get your radio license. You&#8217;ll learn about all the operating modes (SSB, FM, AM, CW), frequencies, and much more! It&#8217;ll give you a better idea of what&#8217;s used for what and why, such as why video is best sent on higher frequencies (i.e., 900MHz) and why *continuous wave* (CW) like what I used in this project is so good for low power transmission of Morse code!</p>
<p>3.) Controlling an RC plane 200 miles away would definitely require something more sophisticated, but not outside the realm of hobbyists! Again, read the exam prep material! IMHO the best way is to read the question bank and Google why an answer is what it is if you don&#8217;t get it.</p>
<p>4.) depending on where you live, you probably have an active VHF repeater within range. Think of it as an IRC server for local radio operators. Once you get on the air with an inexpensive VHF radio (I started with a $65 Puxing 777 from eBay) you&#8217;ll meet a lot of people on the air who can help you learn a ton just by talking to them, and probably even let you borrow equipment of your own until you know what you want to buy! Similar to how computer gurus have tons of old computers in a closet somewhere, a lot of radio gurus have tons of old equipment they&#8217;d be happy to lend out to an eager learner!</p>
<p>Get that license and make some contacts =o)</p>
<p>Once you have a working knowledge of major RF concepts, the world is yours for the hacking!</p>
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		<title>By: truthspew</title>
		<link>http://hackaday.com/2010/07/27/200-mile-rf-transmitter-and-high-altitude-balloon/comment-page-1/#comment-163186</link>
		<dc:creator><![CDATA[truthspew]]></dc:creator>
		<pubDate>Wed, 28 Jul 2010 22:32:29 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=26513#comment-163186</guid>
		<description><![CDATA[BTW, they have their call set to GO GATORS]]></description>
		<content:encoded><![CDATA[<p>BTW, they have their call set to GO GATORS</p>
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		<title>By: Drew</title>
		<link>http://hackaday.com/2010/07/27/200-mile-rf-transmitter-and-high-altitude-balloon/comment-page-1/#comment-163157</link>
		<dc:creator><![CDATA[Drew]]></dc:creator>
		<pubDate>Wed, 28 Jul 2010 21:12:52 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=26513#comment-163157</guid>
		<description><![CDATA[I talked to my friend, he wasn&#039;t able to give me a clear answer since he didn&#039;t have time to read the article I printed for him yet.

I did my own research- it seems the lowest level, Amateur Technician class, can use SSB(Phone)&amp; CW (continuous wave) in the band of 28.300 - 28.500 Mhz, which is roughly 10 meters, and the range your project works in. I don&#039;t know anything yet, so I&#039;m not sure if the signal your transmitter is sending out is one of those signal types.

Thanks very much for offering to answer questions via email, I will take you up on that this weekend- my weekdays are insanely busy- I&#039;m fortunate enough to be learning machining, welding, electronics, and OSHA training at my local college in an experimental manufacturing boot camp of sorts, and I&#039;m meeting people into all kinds of cool Hackaday type backgrounds other than my machining background.

Two last questions here though:

1. What is the signal this uses called? I know it&#039;s using Morse code, but what signal type is that? &quot;CW&quot;, &quot;SSB&quot;, or something else?

2. Would a reciever for this be possible to be nearly as small? I&#039;d like to control an RC plane for 200 miles shooting landscape photos on mountaintops.]]></description>
		<content:encoded><![CDATA[<p>I talked to my friend, he wasn&#8217;t able to give me a clear answer since he didn&#8217;t have time to read the article I printed for him yet.</p>
<p>I did my own research- it seems the lowest level, Amateur Technician class, can use SSB(Phone)&amp; CW (continuous wave) in the band of 28.300 &#8211; 28.500 Mhz, which is roughly 10 meters, and the range your project works in. I don&#8217;t know anything yet, so I&#8217;m not sure if the signal your transmitter is sending out is one of those signal types.</p>
<p>Thanks very much for offering to answer questions via email, I will take you up on that this weekend- my weekdays are insanely busy- I&#8217;m fortunate enough to be learning machining, welding, electronics, and OSHA training at my local college in an experimental manufacturing boot camp of sorts, and I&#8217;m meeting people into all kinds of cool Hackaday type backgrounds other than my machining background.</p>
<p>Two last questions here though:</p>
<p>1. What is the signal this uses called? I know it&#8217;s using Morse code, but what signal type is that? &#8220;CW&#8221;, &#8220;SSB&#8221;, or something else?</p>
<p>2. Would a reciever for this be possible to be nearly as small? I&#8217;d like to control an RC plane for 200 miles shooting landscape photos on mountaintops.</p>
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		<title>By: lwatcdr</title>
		<link>http://hackaday.com/2010/07/27/200-mile-rf-transmitter-and-high-altitude-balloon/comment-page-1/#comment-163132</link>
		<dc:creator><![CDATA[lwatcdr]]></dc:creator>
		<pubDate>Wed, 28 Jul 2010 19:31:28 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=26513#comment-163132</guid>
		<description><![CDATA[@scott couldn&#039;t you use this to create an automatic tracking system for the 900mhz directional antenna?
If you sent the gps data by CW using your radio You could calculate the location to point the 900mhz antenna using some servos.
You could also slave a camera to it for imaging of the balloon. 
Just a though.]]></description>
		<content:encoded><![CDATA[<p>@scott couldn&#8217;t you use this to create an automatic tracking system for the 900mhz directional antenna?<br />
If you sent the gps data by CW using your radio You could calculate the location to point the 900mhz antenna using some servos.<br />
You could also slave a camera to it for imaging of the balloon.<br />
Just a though.</p>
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		<title>By: Scott</title>
		<link>http://hackaday.com/2010/07/27/200-mile-rf-transmitter-and-high-altitude-balloon/comment-page-1/#comment-163129</link>
		<dc:creator><![CDATA[Scott]]></dc:creator>
		<pubDate>Wed, 28 Jul 2010 19:21:36 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=26513#comment-163129</guid>
		<description><![CDATA[http://www.swharden.com/blog/images/balloon_transmitter_final.png]]></description>
		<content:encoded><![CDATA[<p><a href="http://www.swharden.com/blog/images/balloon_transmitter_final.png" rel="nofollow">http://www.swharden.com/blog/images/balloon_transmitter_final.png</a></p>
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		<title>By: man</title>
		<link>http://hackaday.com/2010/07/27/200-mile-rf-transmitter-and-high-altitude-balloon/comment-page-1/#comment-163128</link>
		<dc:creator><![CDATA[man]]></dc:creator>
		<pubDate>Wed, 28 Jul 2010 19:16:14 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=26513#comment-163128</guid>
		<description><![CDATA[where is the circuit diagram for this project]]></description>
		<content:encoded><![CDATA[<p>where is the circuit diagram for this project</p>
]]></content:encoded>
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		<title>By: Sine Wave</title>
		<link>http://hackaday.com/2010/07/27/200-mile-rf-transmitter-and-high-altitude-balloon/comment-page-1/#comment-163051</link>
		<dc:creator><![CDATA[Sine Wave]]></dc:creator>
		<pubDate>Wed, 28 Jul 2010 16:28:05 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=26513#comment-163051</guid>
		<description><![CDATA[@therian-

&quot;ps too much talk about legality of this, dont forget that FCC laws are equivalent to claiming ownership of sunlight or criminalizing vocal communication without permit&quot;

Bad analogy.

No matter how you choose to use sunlight on your property, nothing you do will prevent me from being able to use it, too. On the other hand, your abuse of RF spectrum space can deny me my rights to use it, too. 

Even a malfunctioning street lamp or a cracked insulator on a power pole, for example, has rendered large chunks of the lower HF ham bands unusable. I know, because when it happened locally, I used test equipment to pinpoint the sources of this unintended radiation and then worked with property owners and the power company to rectify those problems. These people acted in a responsible fashion.

As to the matter of vocal communication, if you think there are no rules that govern it, try yelling &quot;fire&quot; in a movie theater or make a joke about a bomb while you are standing in line at an airport. I can guarantee that you will be contacted by someone with a badge who will be more than happy to explain to you why you *don&#039;t* have the right to do those things.

If there is too much talk of anything, there is too much talk of &quot;rights&quot; without any acknowledgement of &quot;responsibility.&quot;  Adults recognize that rights and responsibility go together, and are inseparable. Adolescents think they are entitled to use the credit card without having to pay the bill.]]></description>
		<content:encoded><![CDATA[<p>@therian-</p>
<p>&#8220;ps too much talk about legality of this, dont forget that FCC laws are equivalent to claiming ownership of sunlight or criminalizing vocal communication without permit&#8221;</p>
<p>Bad analogy.</p>
<p>No matter how you choose to use sunlight on your property, nothing you do will prevent me from being able to use it, too. On the other hand, your abuse of RF spectrum space can deny me my rights to use it, too. </p>
<p>Even a malfunctioning street lamp or a cracked insulator on a power pole, for example, has rendered large chunks of the lower HF ham bands unusable. I know, because when it happened locally, I used test equipment to pinpoint the sources of this unintended radiation and then worked with property owners and the power company to rectify those problems. These people acted in a responsible fashion.</p>
<p>As to the matter of vocal communication, if you think there are no rules that govern it, try yelling &#8220;fire&#8221; in a movie theater or make a joke about a bomb while you are standing in line at an airport. I can guarantee that you will be contacted by someone with a badge who will be more than happy to explain to you why you *don&#8217;t* have the right to do those things.</p>
<p>If there is too much talk of anything, there is too much talk of &#8220;rights&#8221; without any acknowledgement of &#8220;responsibility.&#8221;  Adults recognize that rights and responsibility go together, and are inseparable. Adolescents think they are entitled to use the credit card without having to pay the bill.</p>
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		<title>By: Scott</title>
		<link>http://hackaday.com/2010/07/27/200-mile-rf-transmitter-and-high-altitude-balloon/comment-page-1/#comment-163020</link>
		<dc:creator><![CDATA[Scott]]></dc:creator>
		<pubDate>Wed, 28 Jul 2010 15:06:05 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=26513#comment-163020</guid>
		<description><![CDATA[@therian - Of course microwave frequencies are wide open for the taking. Use them all you want and no one will compete with you ...how many hundred miles do you think you can send a message on the ~2GHz wifi frequencies?  There are advantages to low frequencies (i.e., sending messages around the globe with milliwatts at the expense of bitrate), and there is very limited bandwidth down there, and thus the ability to regulate its usage is necessary.]]></description>
		<content:encoded><![CDATA[<p>@therian &#8211; Of course microwave frequencies are wide open for the taking. Use them all you want and no one will compete with you &#8230;how many hundred miles do you think you can send a message on the ~2GHz wifi frequencies?  There are advantages to low frequencies (i.e., sending messages around the globe with milliwatts at the expense of bitrate), and there is very limited bandwidth down there, and thus the ability to regulate its usage is necessary.</p>
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		<title>By: Michael Bradley</title>
		<link>http://hackaday.com/2010/07/27/200-mile-rf-transmitter-and-high-altitude-balloon/comment-page-1/#comment-163018</link>
		<dc:creator><![CDATA[Michael Bradley]]></dc:creator>
		<pubDate>Wed, 28 Jul 2010 14:55:01 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=26513#comment-163018</guid>
		<description><![CDATA[@Scott, Thank you, this makes sense now. great project, love the simplicity!]]></description>
		<content:encoded><![CDATA[<p>@Scott, Thank you, this makes sense now. great project, love the simplicity!</p>
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		<title>By: IsotopeJ</title>
		<link>http://hackaday.com/2010/07/27/200-mile-rf-transmitter-and-high-altitude-balloon/comment-page-1/#comment-163016</link>
		<dc:creator><![CDATA[IsotopeJ]]></dc:creator>
		<pubDate>Wed, 28 Jul 2010 14:53:38 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=26513#comment-163016</guid>
		<description><![CDATA[So much talk about the legality of this! Check out 47CFR97 for the federal regulations regarding amateur radio.  

I just got my technician-level license, and can&#039;t wait to try this!

btw, 200 miles is nothing in amateur radio.   and the FCC actually gives you a lot of privileges with your license...such as the ability to transmit at up to 1500 Watts in certain frequencies!!]]></description>
		<content:encoded><![CDATA[<p>So much talk about the legality of this! Check out 47CFR97 for the federal regulations regarding amateur radio.  </p>
<p>I just got my technician-level license, and can&#8217;t wait to try this!</p>
<p>btw, 200 miles is nothing in amateur radio.   and the FCC actually gives you a lot of privileges with your license&#8230;such as the ability to transmit at up to 1500 Watts in certain frequencies!!</p>
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		<title>By: therian</title>
		<link>http://hackaday.com/2010/07/27/200-mile-rf-transmitter-and-high-altitude-balloon/comment-page-1/#comment-162998</link>
		<dc:creator><![CDATA[therian]]></dc:creator>
		<pubDate>Wed, 28 Jul 2010 14:09:39 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=26513#comment-162998</guid>
		<description><![CDATA[&quot;think about what might happen if radio communications were unrestricted&quot;
 interfering guys get tired of each other and change frequency. Argument about chaos pretty much outdated and apply only to worldwide low-frequency communication, there is plenty local space,for exapmle WIFI prove this with only 14 channels]]></description>
		<content:encoded><![CDATA[<p>&#8220;think about what might happen if radio communications were unrestricted&#8221;<br />
 interfering guys get tired of each other and change frequency. Argument about chaos pretty much outdated and apply only to worldwide low-frequency communication, there is plenty local space,for exapmle WIFI prove this with only 14 channels</p>
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		<title>By: Scott</title>
		<link>http://hackaday.com/2010/07/27/200-mile-rf-transmitter-and-high-altitude-balloon/comment-page-1/#comment-162983</link>
		<dc:creator><![CDATA[Scott]]></dc:creator>
		<pubDate>Wed, 28 Jul 2010 12:33:25 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=26513#comment-162983</guid>
		<description><![CDATA[MY LEGAL RATIONALE - the &#039;danger&#039; of border-line legal radio projects increases with output power. I&#039;m licensed to use 29MHz (license AJ4VD), which I do feel is important. Amateur radio licenses are a good thing, as they do a great job at promoting education. Now, if I were transmitting 50,000 watts in this project, the FCC would probably have a larger axe to grind. However, in this project I&#039;m using about 0.01W (probably less than the a wireless car door unlocker keychain) and since it&#039;s practically undetectable, I&#039;m not overly-concerned.]]></description>
		<content:encoded><![CDATA[<p>MY LEGAL RATIONALE &#8211; the &#8216;danger&#8217; of border-line legal radio projects increases with output power. I&#8217;m licensed to use 29MHz (license AJ4VD), which I do feel is important. Amateur radio licenses are a good thing, as they do a great job at promoting education. Now, if I were transmitting 50,000 watts in this project, the FCC would probably have a larger axe to grind. However, in this project I&#8217;m using about 0.01W (probably less than the a wireless car door unlocker keychain) and since it&#8217;s practically undetectable, I&#8217;m not overly-concerned.</p>
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