https://www.marcelpost.com/wiki/index.php?action=history&feed=atom&title=Forty-9erForty-9er - Revision history2026-06-10T03:36:29ZRevision history for this page on the wikiMediaWiki 1.39.17https://www.marcelpost.com/wiki/index.php?title=Forty-9er&diff=2447&oldid=prevAdmin at 00:27, 10 December 20162016-12-10T00:27:40Z<p></p>
<p><b>New page</b></p><div>The forty-9er is an improved design over the Pixie2. It has two crystals, one for the rx and one for the tx frequency. <br />
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RX power consumption is around 23mA @ 12V<br />
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Output power is around 2 to 3 Watts.<br />
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[[File:Forty-9er-topview.jpg]]<br />
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[[File:Forty-9er pcb top.jpg]]<br />
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[[File:Forty-9er pcb bottom.jpg]]<br />
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[[File:Forty-9er schematic.jpg|200px|thumb|none|Forty-9er Schematic]]<br />
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Description of the original Norcal Forty 9er [[File:49erOrigMnl.pdf]]<br />
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The Final Power Amplifier that is shipped with this kit is the NEC D882 NPN Transistor.<br />
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datasheet: [[File:NEC-2SD882-datasheet.pdf]]<br />
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Apparently, the datasheet lists this part as suitable for a 3W audio amplifier but it has an Ft of 90MHz.<br />
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An initial check revealed that the power output was only 600mW so I decided to replace it with a BD139 which has an Ft of 190MHz. It also has the same footprint and pinout so it is a drop-in replacement for the D882.<br />
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[[File:BD139.jpg]]<br />
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After fitting this transistor the power output was about 1W.</div>Admin