Mixer oscillator for PLL

If the crystals with the ideal frequency is not obtained, then another way to create a feedback oscillator is by mixing the two oscillators. Mixture can also be done by entering the Carrier Oscillator frequency of the plane into the mixer and mix it with 3 MHz crystal oscillator (This crystals are common in the market ). To make this mixer can be used MC1496 as Figure 1 and TA7310 the following Figure 2. If we compare between the two mixer, then a simpler circuit TA7310 and not a lot of eating places on the PCB.

Figure 1. MC1496 mixer


Figure 2.TA7310 PLL mixer

If colleagues have advanced radio amateurs to assemble this kind of PLL along with modifications, it will easily develop with such use types other ICs. In this paper described only single-loop PLL with fellow radio amateur colleagues can continue to develop such a double-loop PLL design so obtained lengkah smaller multi-KHz and the VCO can also be developed into multiband PLL. With a little knowledge about the use of TTL ICs, the tuning frequency can be done in other ways such as with the UP / DOWN switch or can be developed again by using the Rotary decoder circuit.