The oscillator section of the NE612 is configured as either a series-tuned Colpitts- or Clapp oscillator. Depending on the parts the receive range is from 10050 kHz to 10250 kHz. Due to component tolerances the number of turns and/or the capacity of L3 and C7 are adjusted to tune the required portion of the band.

2014年1月27日 · Being a ham operator I'm always on the lookout for new radio related projects. This time I investigated the properties of direct conversion receivers using the cheap and widely available NE612 balanced mixer IC. There are four different versions of this chip NE602, NE612, SA602 and SA612.

2006年4月14日 · ne612 bfo level DSB (Double Side Band) is not a distorted signal. Both side bands carry the same information and each of them could be suppressed, without distorting the information. To improve the performances of NE612 (as a DSB modulator), you can add a 50 K pot (wiper to ground) across pins 1 and 2, and balance it out a little better.

2019年8月30日 · NE612 is built-in here. The main advantage of this IC is that it requires only a few components and it has got an additional gain of about 12dB or more. In VDD line you will find a 5.6V Zener to bring 12..14V supply voltage down to about 6V.

2011年12月30日 · Der BFO ist ein quarzgesteuerter Colpitts-Oszillator. Im RX-Zweig wird ein NE612 als Produktdetektor, im TX-Zweig ein MC1496 als DSB-Modulator eingesetzt.

2020年1月22日 · Thus a low valued capacitor has been inserted prior to the SSB filter, sited on the RX board. After that we see an amplifier with limited gain due to high emitter degeneration and the NE612 as TX mixer.

2008年1月25日 · The design uses an NE612 oscillator/mixer to do most of the job and an LM386 as an audio amplifier suitable for driving headphones. NE612s don't have a lot of dynamic range so the only gain control is a pot at the antenna that serves as RF attenuator and overall "loudness" control.

2019年4月5日 · NE612: direrct conversion mini rx :like neophyte receiver on QST. RK-50. 2 Layers PCB 35 x 60 mm FR-4, 1.6 mm, 1, HASL with lead, Green Solder Mask, White silkscreen

The NE612, also known as the NE612A, is a versatile analog multiplier and mixer IC that is widely used in radio frequency (RF) and intermediate frequency (IF) applications. At its core, the NE612 functions as a balanced modulator and a mixer, allowing for the combination of multiple input signals and the generation of an output signal with ...

2011年1月13日 · I have seen NE612 transverters before, those were using two NE612s. JA6HIC uses one chip for both RX and TX conversion. The rest of the design involves an external LO. The circuit is fed by RX and TX control voltages, this may be handy in places, although I believe that this is merely a remainder of JA6HIC's earlier designs involving diode mixers.