23cm ldmos from ebay cheapy 450Mhz PA

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VK5YYY
Posts: 81
Joined: Sun Sep 27, 2015 1:47 am

23cm ldmos from ebay cheapy 450Mhz PA

Post by VK5YYY » Tue Apr 26, 2016 1:55 pm

Have a look at this little beauty rejigged to 1275mhz, thanks to K5TRA for his ideas
Used 41mm small semi rigid for the loops and a couple of .5-10pf trimmers which have since been laid down and pushed hard up against body of the PA
It gets 16db gain running flat out, only tested to a few watts so far and need a much bigger heat sink
Sent a test pattern to our local repeater so it works
The capacitance values were changed to around a third of the the recommended at 450mhz
ATCs supplied covered all the values required
Yet to drive it a little harder and who know how stable this thing will be
Cost $41USD
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Doesn't get any cheaper than this
Doesn't get any cheaper than this
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