| Low frequency DDS signal source |
Function signal | Frequency adjustable from 0.1 to 50KHZ, 10MVp-p to 5Vp-p (continuously adjustable) |
| Music signal | Programmable | |
| Modulation signal | The modulation signal and carrier synchronization can display the AM, DSB and FM waveforms on the common oscilloscopes |
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| Telephone interface | Wireless voice communication can be carried out | |
| Audio amplifier, speaker |
Perform power amplifier output on the receiver's audio signal | |
| DDS high frequency signal source |
High frequency sine wave |
Frequency range: 1HZ ~ 25MHZ, output amplitude: 100MVp-p to 2Vp-p (continuous adjustable) |
| Frequency meter |
Measurement frequency range: 0-25MHZ, input voltage not less than 50mv; |
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| Frequency sweep meter |
Amplitude and frequency characteristics of color LCD display, sweep frequency range, time programmable |
| Sine wave oscillator and transistor mixing |
LC frequency 4-12MHz, can be used to study the amplitude frequency characteristics of the Schiller oscillation circuit and the Clapper oscillation circuit. Crystal: 8.8MHZ. Triode mixer circuit: Local oscillator input 8.8MHZ carrier 6.3MHZ, output 2.5MHZ. Can be completed: Operation point setting, voltage impact on the oscillation frequency, oscillation frequency, high frequency signal amplitude, filter center frequency and other control assessment. |
| Intermediate release AGC and demodulation module |
Amplify the 2.5MHz intermediate frequency signal, and the gain is greater than 20db. Envelope detection, observe the diagonal cutting distortion and bottom cutting distortion, and low frequency amplification. Can be completed: Intermediate frequency selection loop, Intermediate release gain, detection distortion, signal output amplitude and other parameters control and assessment. |
| Resonant circuit module |
Single tuning, double tuning, through the varactor to adjust the tuning loop parameters, reliable and stable performance; center frequency 6.3MHZ. Can be completed: Single tuning double tuning loop parameters, tuning loop frequency-selective characteristics control and assessment. |
| High frequency power amplifier module |
Wireless transmission: 6.3MHZ transmit for base amplitude modulation. Observe the phenomenon of class-C working state of high-frequency power amplifiers, test the tuning characteristics and load characteristics of class-C amplifiers, test the effects of changes in excitation signals, load changes and power supply voltage variations on the operating state, and the cosine pulse waveform can be clearly observed in three states of undervoltage, critical and overvoltage. Amplitude modulation: Can be completed: Power amplifier work status control and assessment. |
| Frequency modulation and capacitance coupling frequency discrimination module |
Capacitive coupling loop phase discriminator, slope discriminator 6.3MHZ center frequency. Synchronous demodulation and integrated mixing (Local oscillator input 8.8MHZ carrier 6.3MHZ, output 2.5MHZ). Can be completed: FM signal center frequency, signal amplitude, frequency discrimination loop characteristics, operating point parameter control and assessment. |
| Integrated multiplier amplitude modulation, mixing and synchronous demodulation modules |
AM, DSB, SSB modulation and demodulation, carrier frequency 100KHZ-2.5MHZ. Can be completed: Modulation, modulation signal output, mixing filter and other functional assessment. |
