"For between $20 and $25, I returned home with headphones, a tuning coil
, a crystal detector, a condenser and other mystifying gadgets."
The second method is to set the free-running frequency to a desired low end frequency and tune the low power tuning coil
current in a positive direction to achieve +2000 MHz tuning range.
This correction is achieved by feeding back the discriminator voltage to the electromagnet tuning coil
with a gain of approximately 200.
Frequency range (GHz) 2.5 to 4.0 Insertion loss (dB) 5.0 3 dB bandwidth (MHz) 30 to 60 Coarse selectivity (dB) 36 Tuning coil
current (A) 0.5 Switch time ([[micro]second]) 15 Weight (g) 80 Characteristics of a tuned filter compared to the [S.sub.21] characteristics of a YIG-tuned filter based on equal insertion passband losses are shown in Figure 7.
A simple PLL/FM modulation connection with a fine tuning coil