vco tuning gain

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yopper
 
Posts: 10
Joined: Mon Jan 01, 2007 3:26 pm

vco tuning gain

Post by yopper »

Hi,

I saw the web pages give some values for R13 and R15 to set the VCO tuning gain. According to my calculations they are a bit off for the specified VCO's (ROS-2500 and ROS-1700W). Especially the ROS-2500 is only specd for 14V (16V absolute max). The schematics give 100K for both and the website 39K (R13) and 47K (R15). When taking 3.3V + 0.5V (saw tooth) = 3.7V I get

gain = 14/3.7 = 3.87, R15 about 27K

and for VCO 2:

24/3.7 = 6.48 so R13 about 56K

Just FYI.

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