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Bias Setting?

[email protected]
 

I just completed my BIT40X and can only get about 1 Watt of RF out.? I turned the bias adjust pot fully clockwise and read a current of about 200 ma from the power supply.? The instructions say it shoud be near zero ma and increase as you turn the pot counterclockwise.

I used a 100 MHz scope to measure the peak voltage across a 50W Bird dummy load.? The peak voltage is about 10 volts which equates to about 1 W of output power.? I had a friend listen to my signal and he said it was clear but very weak.

Any suggestions about where to look?

The receiver portion works just fine on 40 meters.? Having no AGC will take a little getting used to.? Hi Hi

Barry - K5VIP
 

You might look here: ??/g/BITX20/message/22764

and maybe here: ??/g/BITX20/message/21027

Others have posted DC voltages, such as this file ? /g/BITX20/files/K7AGE/BITX40%20Voltage%20Measurments.pdf? from this post ?/g/BITX20/message/23583?

LTSpice is a very cool tool when figuring out this stuff, and is free to download. ?I haven't figured out how to get it to work properly for time domain plots of high Q circuits using quartz crystals yet.

Jerry, KE7ER

On Fri, Mar 17, 2017 at 01:28 pm, Nathern Priddy wrote:

I used a 100 MHz scope to measure the peak voltage across a 50W Bird dummy load.? The peak voltage is about 10 volts which equates to about 1 W of output power.? I had a friend listen to my signal and he said it was clear but very weak.

Any suggestions about where to look?

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