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Transformers after finals.
- Thread starter dvdljns
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The matching network is also a low pass filter to remove harmonics from the output (no transistor is perfectly linear). I would guess the filter would be somewhat standard but filter design has a lot of variables so each model of radio may be different. One of the factors would be how much undesired harmonics the final puts out.
Most AM only units probably use high level modulation so the filter would be a different design than a final that had to stay in its linear range to properly handle SSB.
Using 13.8 volts and 4 watts the Impedance is close enough to 50 ohms if a transformer is used it would likely be a 1:1 ratio and used just for isolation although it may also be tuned as part of the filtering.
I would try to find the parts list as reverse engineering would get complicated.
Most AM only units probably use high level modulation so the filter would be a different design than a final that had to stay in its linear range to properly handle SSB.
Using 13.8 volts and 4 watts the Impedance is close enough to 50 ohms if a transformer is used it would likely be a 1:1 ratio and used just for isolation although it may also be tuned as part of the filtering.
I would try to find the parts list as reverse engineering would get complicated.
prcguy
Member
Typically a solid state transmitter PA using silicon transistors has fairly low output impedance, maybe 5 ohms + or - a few. The output matching in a CB is usually a Pi network with a series inductor and shunt capacitor either side of the inductor. A FET PA transistor would usually be lower impedance than a silicon.
The Pi network is designed to match the very low impedance of the final transistor to 50 ohms, and it also acts as a low pass filter reducing harmonics. I believe the Radio Amateur Handbook has information on designing an appropriate Pi network or there is probably online calculators.
The Pi network is designed to match the very low impedance of the final transistor to 50 ohms, and it also acts as a low pass filter reducing harmonics. I believe the Radio Amateur Handbook has information on designing an appropriate Pi network or there is probably online calculators.
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