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Old April 13th 14, 05:48 PM posted to,
Fred McKenzie Fred McKenzie is offline
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First recorded activity by RadioBanter: Jul 2006
Posts: 317
Default Hayward design broadband low noise preamp for loops

In article ,
Fred McKenzie wrote:

The circuit is billed as a broadband amplifier, but low noise is not
mentioned. It is presented as a 24 dB add-on amplifier for a low noise
preamp used in Figure 18.


I found a circuit in a late 70s ARRL Handbook. It is a single stage
identical to each of the two stages in the Antenna Book's Figure 19. I
suspect it is the "Hayward design" you were initially looking for.

The Handbook mentions that the circuit uses negative feedback for wide
bandwidth and unconditional stability. The 2N5179 data sheet indicates
it has low noise.