[hpsdr] Penelope Minimum Power

[Joe Martin K5SO]

Hi Keith,

If you run Penelope at power levels lower than about 200mW or so your  
dynamic range will suffer so it's best to use an external attenuator  
and always run Penelope at a healthy output level from the board itself.

If you only need 2 mW or less output you can pull J2 and take the rf  
out from pins 1 & 3 on J2 instead of from the BNC connector.   
Actually, you can lift the center conductor pin on the BNC connector  
from the board and use a small coaxial line from the BNC over to J2 to  
make a nice configuration.  Doing so bypasses the output amplifier  
stage on Penelope and allows you to run with full dynamic range but  
with a very low power out level.

If you need more than 2mW out an external attenuator with the normal  
Penelope configuration is best.

73,  Joe K5SO

On Apr 27, 2009, at 8:46 AM, <n3ick at cox.net> wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
> Was wondering if anyone had already checked what the stable minimum  
> output power or Penelope is? Setting up a PA to use with it I need  
> to use low power settings to prevent overdriving the PA. Maybe would  
> be best to just put a fixed attenuator in line because of software  
> changes that may occur. Any info and thoughts appreciated thanks.
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