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> Eico 710 grid dip meter oscillator
Eico 710 grid dip meter oscillator
EICO 710 GRID DIP METER OSCILLATOR was a Very Popular AC Power Grid Dip Meter/Oscillator with a frequency range of 400 KHz-250MHz in 8 overlapping ranges and measuring a Cute & Compact 6.5 L x 2.5 H x 2.3 W and uses a 1:7 Planetary Drive on the tuning capacitor, a 6AF4A in a Colpitt s oscillator circuit and is transformer-operated, using only about 10 Watts of power.
A Grid Dip Meter/Oscillator is basically a wide-range oscillator with a meter in the grid-return line to indicate when the resonant frequency of the tuned circuit it is loosely coupled to match the frequency of the GDO oscillator. That happens because the tuned circuit-under-test absorbs the energy of the oscillator, causing the "dip" of the meter needle downwards. If that oscillator is reasonably calibrated, you then know the approximate resonant frequency of your coil-capacitor combination.
