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<channel>
	<title>Comments on: RF modem + 250mW amplifier</title>
	<atom:link href="http://hackaday.com/2009/04/02/rf-modem-250mw-amplifier/feed/" rel="self" type="application/rss+xml" />
	<link>http://hackaday.com/2009/04/02/rf-modem-250mw-amplifier/</link>
	<description>Fresh hacks every day</description>
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	<item>
		<title>By: Sweton  T Fleming</title>
		<link>http://hackaday.com/2009/04/02/rf-modem-250mw-amplifier/comment-page-1/#comment-94610</link>
		<dc:creator><![CDATA[Sweton  T Fleming]]></dc:creator>
		<pubDate>Thu, 17 Sep 2009 09:23:51 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=10097#comment-94610</guid>
		<description><![CDATA[these are really great to have..it is great to see you..]]></description>
		<content:encoded><![CDATA[<p>these are really great to have..it is great to see you..</p>
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	<item>
		<title>By: me2</title>
		<link>http://hackaday.com/2009/04/02/rf-modem-250mw-amplifier/comment-page-1/#comment-70936</link>
		<dc:creator><![CDATA[me2]]></dc:creator>
		<pubDate>Fri, 17 Apr 2009 22:36:57 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=10097#comment-70936</guid>
		<description><![CDATA[Wave Magnum - High Power USB Wireless Adapter. Huge 1/2 Watt output. FTW


http://www.radiolabs.com/products/wireless/wave-magnum.php]]></description>
		<content:encoded><![CDATA[<p>Wave Magnum &#8211; High Power USB Wireless Adapter. Huge 1/2 Watt output. FTW</p>
<p><a href="http://www.radiolabs.com/products/wireless/wave-magnum.php" rel="nofollow">http://www.radiolabs.com/products/wireless/wave-magnum.php</a></p>
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	<item>
		<title>By: Oleg Mazurov</title>
		<link>http://hackaday.com/2009/04/02/rf-modem-250mw-amplifier/comment-page-1/#comment-70773</link>
		<dc:creator><![CDATA[Oleg Mazurov]]></dc:creator>
		<pubDate>Thu, 16 Apr 2009 16:53:13 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=10097#comment-70773</guid>
		<description><![CDATA[I used Xbee PROs for links over a 1000m( with antenna ). They are cheap and legal. The power is 60mw, current consumption 300ma.]]></description>
		<content:encoded><![CDATA[<p>I used Xbee PROs for links over a 1000m( with antenna ). They are cheap and legal. The power is 60mw, current consumption 300ma.</p>
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	<item>
		<title>By: Rob</title>
		<link>http://hackaday.com/2009/04/02/rf-modem-250mw-amplifier/comment-page-1/#comment-69553</link>
		<dc:creator><![CDATA[Rob]]></dc:creator>
		<pubDate>Tue, 07 Apr 2009 11:31:37 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=10097#comment-69553</guid>
		<description><![CDATA[I&#039;m really getting into RF electronics/communications.  Are there any good RF websites/forums out there?]]></description>
		<content:encoded><![CDATA[<p>I&#8217;m really getting into RF electronics/communications.  Are there any good RF websites/forums out there?</p>
]]></content:encoded>
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	<item>
		<title>By: samurai1200</title>
		<link>http://hackaday.com/2009/04/02/rf-modem-250mw-amplifier/comment-page-1/#comment-69519</link>
		<dc:creator><![CDATA[samurai1200]]></dc:creator>
		<pubDate>Tue, 07 Apr 2009 04:28:34 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=10097#comment-69519</guid>
		<description><![CDATA[i&#039;m pretty skeptical that he&#039;s actually getting 1km on 250mW, without an antenna, especially with a shit-ton of 900mhz noise. maybe a few valid packets of data, but theres no way it could be a stable stream.]]></description>
		<content:encoded><![CDATA[<p>i&#8217;m pretty skeptical that he&#8217;s actually getting 1km on 250mW, without an antenna, especially with a shit-ton of 900mhz noise. maybe a few valid packets of data, but theres no way it could be a stable stream.</p>
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	<item>
		<title>By: strider_mt2k</title>
		<link>http://hackaday.com/2009/04/02/rf-modem-250mw-amplifier/comment-page-1/#comment-69252</link>
		<dc:creator><![CDATA[strider_mt2k]]></dc:creator>
		<pubDate>Sat, 04 Apr 2009 11:30:43 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=10097#comment-69252</guid>
		<description><![CDATA[Very nice work under the circumstances!

If they get that kind of performance without an antenna then imagine what using a pair of properly tuned radiators would do!

-Based on this performance you could probably go hellishly far with a set of properly aimed directional antennas.

combining radio with data stuff is probably my favorite combination of disciplines.

kudos dude]]></description>
		<content:encoded><![CDATA[<p>Very nice work under the circumstances!</p>
<p>If they get that kind of performance without an antenna then imagine what using a pair of properly tuned radiators would do!</p>
<p>-Based on this performance you could probably go hellishly far with a set of properly aimed directional antennas.</p>
<p>combining radio with data stuff is probably my favorite combination of disciplines.</p>
<p>kudos dude</p>
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		<title>By: threepointone</title>
		<link>http://hackaday.com/2009/04/02/rf-modem-250mw-amplifier/comment-page-1/#comment-69167</link>
		<dc:creator><![CDATA[threepointone]]></dc:creator>
		<pubDate>Fri, 03 Apr 2009 21:32:10 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=10097#comment-69167</guid>
		<description><![CDATA[I&#039;m fairly certain that this does not interfere with cellphone bands, unless you really eff up the transmitter.

Anyway, 900Mhz is an ISM band and not nearly as illegal to mess around with as, say, jamming other stations on FM *ahem*. In fact, I know for a fact that there are commercially available 1W 900Mhz transmitters on the market--as another reader mentioned, if the wireless system is frequency hopping, this isn&#039;t even close to the maximum power output allowed (in fact, you&#039;re allowed 4W maximum EIRP, so 1W with a 6dBi antenna--the one he used was only 3dBi, I think). 

Of course, I don&#039;t know if this applies for Europe, and I think any wireless DIY project is a bit mucky since you&#039;d usually have to get your circuit FCC approved first and whatnot. I haven&#039;t looked at it yet, but I&#039;m fairly certain that implementation he uses does not employ frequency hopping (though the CC1100 is definitely capable of it)]]></description>
		<content:encoded><![CDATA[<p>I&#8217;m fairly certain that this does not interfere with cellphone bands, unless you really eff up the transmitter.</p>
<p>Anyway, 900Mhz is an ISM band and not nearly as illegal to mess around with as, say, jamming other stations on FM *ahem*. In fact, I know for a fact that there are commercially available 1W 900Mhz transmitters on the market&#8211;as another reader mentioned, if the wireless system is frequency hopping, this isn&#8217;t even close to the maximum power output allowed (in fact, you&#8217;re allowed 4W maximum EIRP, so 1W with a 6dBi antenna&#8211;the one he used was only 3dBi, I think). </p>
<p>Of course, I don&#8217;t know if this applies for Europe, and I think any wireless DIY project is a bit mucky since you&#8217;d usually have to get your circuit FCC approved first and whatnot. I haven&#8217;t looked at it yet, but I&#8217;m fairly certain that implementation he uses does not employ frequency hopping (though the CC1100 is definitely capable of it)</p>
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	<item>
		<title>By: fartface</title>
		<link>http://hackaday.com/2009/04/02/rf-modem-250mw-amplifier/comment-page-1/#comment-69134</link>
		<dc:creator><![CDATA[fartface]]></dc:creator>
		<pubDate>Fri, 03 Apr 2009 18:13:49 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=10097#comment-69134</guid>
		<description><![CDATA[Kind of like my 10W FM transmitter amp.  I use it to block out the RAP stations when I am on a construction site.

Some of those insulation guys or drywallers listen to some really crappy music, great to go to the car, flip on and kill that station with a nice blank station.

I typically send nothing, but I can transmit my Sirius radio as well... works good on larger sites when I am programming a Lighting control panel or Honeywell Access Panel.]]></description>
		<content:encoded><![CDATA[<p>Kind of like my 10W FM transmitter amp.  I use it to block out the RAP stations when I am on a construction site.</p>
<p>Some of those insulation guys or drywallers listen to some really crappy music, great to go to the car, flip on and kill that station with a nice blank station.</p>
<p>I typically send nothing, but I can transmit my Sirius radio as well&#8230; works good on larger sites when I am programming a Lighting control panel or Honeywell Access Panel.</p>
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	<item>
		<title>By: cmholm</title>
		<link>http://hackaday.com/2009/04/02/rf-modem-250mw-amplifier/comment-page-1/#comment-69130</link>
		<dc:creator><![CDATA[cmholm]]></dc:creator>
		<pubDate>Fri, 03 Apr 2009 17:48:41 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=10097#comment-69130</guid>
		<description><![CDATA[He wasn&#039;t claiming bosnia-herzegovina wasn&#039;t part of Europe. He&#039;s suggesting that the regulatory environment there is a bit loose.]]></description>
		<content:encoded><![CDATA[<p>He wasn&#8217;t claiming bosnia-herzegovina wasn&#8217;t part of Europe. He&#8217;s suggesting that the regulatory environment there is a bit loose.</p>
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	<item>
		<title>By: Steve</title>
		<link>http://hackaday.com/2009/04/02/rf-modem-250mw-amplifier/comment-page-1/#comment-69116</link>
		<dc:creator><![CDATA[Steve]]></dc:creator>
		<pubDate>Fri, 03 Apr 2009 16:33:29 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=10097#comment-69116</guid>
		<description><![CDATA[&quot;The article is posted on a Bosnia-Herzegovina domain web site, so “illegal” as we Americans or Europeans think of it doesn’t apply.&quot;

uh

&quot;Bosnia and Herzegovina is a country on the Balkan peninsula of South Eastern Europe with an area of 51,129 square kilometres (19,741 sq mi). &quot;]]></description>
		<content:encoded><![CDATA[<p>&#8220;The article is posted on a Bosnia-Herzegovina domain web site, so “illegal” as we Americans or Europeans think of it doesn’t apply.&#8221;</p>
<p>uh</p>
<p>&#8220;Bosnia and Herzegovina is a country on the Balkan peninsula of South Eastern Europe with an area of 51,129 square kilometres (19,741 sq mi). &#8220;</p>
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	<item>
		<title>By: leon</title>
		<link>http://hackaday.com/2009/04/02/rf-modem-250mw-amplifier/comment-page-1/#comment-69110</link>
		<dc:creator><![CDATA[leon]]></dc:creator>
		<pubDate>Fri, 03 Apr 2009 14:40:42 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=10097#comment-69110</guid>
		<description><![CDATA[jan: not sure i implied anywhere that snr improves with amplification.]]></description>
		<content:encoded><![CDATA[<p>jan: not sure i implied anywhere that snr improves with amplification.</p>
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	<item>
		<title>By: Jan</title>
		<link>http://hackaday.com/2009/04/02/rf-modem-250mw-amplifier/comment-page-1/#comment-69108</link>
		<dc:creator><![CDATA[Jan]]></dc:creator>
		<pubDate>Fri, 03 Apr 2009 14:29:19 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=10097#comment-69108</guid>
		<description><![CDATA[leon: you can&#039;t improve snr by simple amplification. the noise level will be amplified by the same amount.]]></description>
		<content:encoded><![CDATA[<p>leon: you can&#8217;t improve snr by simple amplification. the noise level will be amplified by the same amount.</p>
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	<item>
		<title>By: Teebo</title>
		<link>http://hackaday.com/2009/04/02/rf-modem-250mw-amplifier/comment-page-1/#comment-69106</link>
		<dc:creator><![CDATA[Teebo]]></dc:creator>
		<pubDate>Fri, 03 Apr 2009 13:50:06 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=10097#comment-69106</guid>
		<description><![CDATA[Hey everybody thanks for telling us that it&#039;s illegal, Buzz Killington.]]></description>
		<content:encoded><![CDATA[<p>Hey everybody thanks for telling us that it&#8217;s illegal, Buzz Killington.</p>
]]></content:encoded>
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	<item>
		<title>By: leon</title>
		<link>http://hackaday.com/2009/04/02/rf-modem-250mw-amplifier/comment-page-1/#comment-69105</link>
		<dc:creator><![CDATA[leon]]></dc:creator>
		<pubDate>Fri, 03 Apr 2009 13:45:12 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=10097#comment-69105</guid>
		<description><![CDATA[sorry, that&#039;s with regards to the &quot;GSM band with lots of cellular noise&quot; will probably only effect SNR. (this could turn ugly) you&#039;d also have to look at what modulation scheme is being used by each (chipcon radio and GSM) if you are looking at interference.]]></description>
		<content:encoded><![CDATA[<p>sorry, that&#8217;s with regards to the &#8220;GSM band with lots of cellular noise&#8221; will probably only effect SNR. (this could turn ugly) you&#8217;d also have to look at what modulation scheme is being used by each (chipcon radio and GSM) if you are looking at interference.</p>
]]></content:encoded>
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	<item>
		<title>By: rasz</title>
		<link>http://hackaday.com/2009/04/02/rf-modem-250mw-amplifier/comment-page-1/#comment-69104</link>
		<dc:creator><![CDATA[rasz]]></dc:creator>
		<pubDate>Fri, 03 Apr 2009 13:28:53 +0000</pubDate>
		<guid isPermaLink="false">http://hackaday.com/?p=10097#comment-69104</guid>
		<description><![CDATA[leon first you say it would increase sensitivity, then that it wouldnt. Make up your mind :)
Anyway its moot as he is pumping out on GSM band and has to fight with Cell towers.]]></description>
		<content:encoded><![CDATA[<p>leon first you say it would increase sensitivity, then that it wouldnt. Make up your mind :)<br />
Anyway its moot as he is pumping out on GSM band and has to fight with Cell towers.</p>
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