I want to design a PIC based SWR watt meter. Please see the attached block diagram of our system.My main problem is the Low Pass Filter Out gives different voltages at different PLL frequency.
Ex:if we tuned 90.2Mhz/200Watts the voltage out is somewhat
if we tuned 103.2Mhz/200Watts the voltage out is somewhat.
The voltage is varying to tuned frequency.How to overcome this?
Also attached our filter coupler.
**broken link removed**
Ex:if we tuned 90.2Mhz/200Watts the voltage out is somewhat
if we tuned 103.2Mhz/200Watts the voltage out is somewhat.
The voltage is varying to tuned frequency.How to overcome this?
Also attached our filter coupler.
**broken link removed**