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HP 8447D AMPLIFIER
 
 


 
 

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The 8447D is a general purpose wideband amplifier with a frequency range of 100kHz to 1.3GHz.  This cost $765 in 1980.  A Manual was downloaded.
 
 
 
Front view
 
 
Gain is 26dB ±1.5dB with a noise figure of <8.5dB and a maximum output level of +7dBm.  50Ω input and output impedance and a maximum dc input voltage of ±10V.  Other versions were also available: 8447A 100kHz to 400MHz, 20dB gain, >+6dB output; 8447C 30MHz to 300MHz, 30dB gain, >+17dB output; 8447E 100kHz to 1.3GHz, 22dB gain, >+15dB output.  Also the 8447F which is a D and E version in one case.
 
 
 
 
 
The Amplifier consists of a power supply and a thin film hybrid integrated circuit amplifier which is hermetically sealed.  This has low noise, low distortion, flat frequency response, long term stability & reliability.  Front Panel BNC input and output connectors.
 
 
 
 
 
 
 
 
 
 
 
Rear Panel power connector, fuse and voltage selector.
 
 
 
 
 
 
 
 
July 2007
 
The 8447D is in good condition and just needed cleaning.  Powers up ok and a quick test shows that it is amplifying without any obvious distortion.  Performance tests need to be carried out.
 
 
 
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