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Old November 5th 07, 04:43 PM posted to rec.radio.amateur.homebrew
Joe[_5_] Joe[_5_] is offline
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First recorded activity by RadioBanter: Nov 2007
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Default Looking for best pre-amp RF device, for HF

On Nov 2, 9:01 pm, "numeric" wrote:
Looking for a transistor suggestion, for an RF receive pre-amplifier to
cover 10Hz to about 60Mhz. So far, I have found a pair of 2N5109B bipolar
transistors, which work ok in a grounded base push-pull design. These
transistors provide a gain of about 12db over an input voltage range of 1
microvolt or less to over 4 volts. These transistors were designed many
years ago; hopefully better transistors now exist which can provide superior
linearity and better isolation form input to output. In addition, a spice
model must be available.

Thanks.


He did ask for a RECEIVE pre-amp, to 60mHz
Not a power amp, and not 60GHz, and you don't need 4volts for a
receive preamp

How about and MPF102 JFET in Class A
Bias it at about 8mA, and you should get ~20db power gain