Diode Ring Mixer Direct Conversion Receiver

In the ideal mixer there would be absolutely no rf or lo appearing on the if output or absolutely no lo power appearing on the rf port. This is okay but not optimal.

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Radio Receiver Circuitry Part 2

Introduction To Mixers

Simpler single signal direct conversion receivers.

Diode ring mixer direct conversion receiver. This is a thought bubble. For direct conversion receivers zero if there is no image band image cannot be. This 5vdc is used on diode switch input pins on receiver board to select the required.

My best a version of rick campbells r1 receiver with a level 17 diode ring mixer still thrills me to bits. For a receive or transmit mixer not a concern but if used as a product detector or direct conversion receiver this could present a problem with reciprocal mixing products. I tried product detec tors using a single diode a dual gate mosfet a pair of back to back diodes an lm1496 an xr2208 single balanced diode mixers and double balanced diode mixers.

Its much easier to mentally screen it out with this receiver compared to say a pixie or other simple direct conversion receiver which lacks a double balanced diode ring mixer up front. In coming rf signal is fed straight to a double balanced diode ring mixer and mixed with same frequency vfo. Direct conversion receiver i built and tested a score of circuits.

There is still some discernable am bleedthrough but not much at all. Nic hamilton would be interested to hear your comments. Direct conversion experiments introduction.

Mixer output is intelligence carrying modulated audio signal. Simpler single signal direct conversion receivers. As the multipig is a modular radio.

If you want info on mixers click here. I plan to use its vfo and band pass filter for my dc experiments which will be based on the splendid series of radcom articles by eamon skelton. The direct conversion receiver dcrx has many faults.

October 28 2015 october 28. For example the diode ring mixer transformers are now ft37 43s instead of tv. Conversion loss of a typical diode mixer is approximately 6db.

The ne602 was probably chosen for low cost and simplicity. Some experiments in direct conversion receivers. In the first installment of this series we discussed why were building a direct conversion receiver and talked about some basic ideas.

Direct conversion receivers and direct demodulation. How do i describe the sound of a well designed dc receiver. A standard double balanced diode ring mixer would give the receiver a better performance.

A look at the receiver portion of the schematic show that the phaser has a direct conversion receiver using the time proven but dated ne602 mixer. The receiver could also use some form of agc like i use in the agc 80 series. In a receiver the most damaging distortion products are odd order since those are.

In this installment we explore what it takes to make the leap from a printed schematic to something physical that works. Having built a simple crystal set and a super regenerative receiver i was keen to experiment with a direct conversion receiver. I built a direct conversion 2 meter receiver on a superstrip not recommend.

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