Re: Variable power control


Jerry Gaffke
 

Here's an old thread well worth reading that touches on pin diode attenuators, mostly in regard to agc for the receiver.
    https://groups.io/g/BITX20/topic/5945215
Here's another old thread:
    https://groups.io/g/BITX20/topic/5913954

Jerry, KE7ER


On Thu, Feb 22, 2018 at 06:34 am, Karl Heinz Kremer, K5KHK wrote:
There is an HP application note about PIN diode attenuators: http://www.hp.woodshot.com/hprfhelp/4_downld/lit/diodelit/an1048.pdf

I was just about to recommend a PIN diode attenuator as well. The device used in this particular configuration reached it's end of life, and may be hard to get soon. There are alternatives: 

https://www.nxp.com/docs/en/data-sheet/BAP70Q.pdf

The data sheet has a chart that shows insertion loss based on frequency and control voltage. 
--

Join BITX20@groups.io to automatically receive all group messages.