From GRWiki
Jump to navigation Jump to search
General Radio 1216-A
Unit IF amplifier
General Radio 1216-A Unit IF Amplifier

Available from 1954 to 1968

Catalog History
 Document Year Page
Catalog N 1954 118
Catalog O 1956 68
Catalog P 1959 66
Catalog Q 1961 58
Catalog R 1963 82
Catalog S 1965 107
Catalog T 1968 122
(All manuals in PDF format unless noted otherwise)

The General Radio 1216-A Unit IF Amplifier was introduced in Catalog N (1954) and remained available through Catalog T (1968).

The Type 1216-A is an high gain amplifier operating at a fixed frequency of 30 MHz with a bandwidth of 0.7 MHz.

Combined with a unit oscillator and mixer, it forms what General Radio called a DNT detector, which in its simplest form is a radio receiver whose frequency range is determined by the selected unit oscillator.

The 1216-A is equipped with a meter for signal strength measurements using its built in attenuator. The meter can switched to monitor the input to the amplifier. An AVC function located on the attenuator switch is advantageous when using the 1216-A in the null detector role.

The 1216-A contains its own power supply and connection for suppling power to an external unit oscillator. Front-panel binding posts provide an output of the demodulated signal.

The recommended mixer for DNT applications is the 874-MR with an upper frequency limit of 5 GHz.


  • Center Frequency: 30 MHz
  • Bandwidth: 0.7 MHz at 3 dB down; 9.5 MHz at 60 dB down
  • Attenuator Range: 0 to 70 dB in 10 dB steps, a single 3 dB step is also provided
  • Sensitivity: Less than 2 μV input from a 400 Ω source required for a 1% meter deflection (above noise). Less than 50 μV input from a 400 Ω source required for full-scale meter deflection. Input voltages referred to are open circuit source voltages.