Posted on Mar 19, 2013

The unit consists of rlamplifier Q1, local oscillatorQ2, and mixer Q3. The two bands are covered without a bandswitch by using an i-f or 3.5 MHz. The oscillator range is 7.5 to 14.5 MHz. Incoming signals from 4 to 11 MHz are mixed with the oscillator to produce the 3.5-MHz i-f. Signals from 11 to 18 MHz are mixed with the oscillator to also produce an i-f of 3.5 MHz. At any one oscillator frequency, the two incoming signals are 7 MHz apart.

Click here to download the full size of the above Circuit.

Rf amplifier input Cl/L1 comprises a high-Q, lightly loaded, tuned circuit; this is essential for good band separation.

Leave Comment

characters left:

New Circuits



Popular Circuits

positive voltage regulator circuit with
FM Transmitter Bugs
LM2876 40W audio power amplifier circuit design
27MHz CB Amplifier Circuit
Build Basic Radio Frequency Electronic Circuits
Timing SCR control motor reversing circuit
Vanda F-9500A preamplifier b