Sa612 Mixer Circuits

There is a Zener diode providing a 5 Volt supply to the SA602 chip. For SB/CW I use a simple BFO, same circuit as the ten-tec one. https://oshpark. Frequency of interest 10 MHz. I don't know if the VFO output is suitable to drive the IXD directly. The linear detector is on the part of the PC board in the foreground, and the TO220 package to the left of it is an LM317 voltage regulator for the 6 V power rail. A QRP SSB/CW Transceiver for 14 MHz Part 1: Exotic circuitry and hard-to-find components aren't necessary if you want to build excellent performance into a home-brew SSB/CW transceiver: Careful design is the key. requirement for transformers or tuned circuits. The pre-amp circuit is designed around an SSM analog low noise pre-amp integrated circuit. On receive the signal comes on CX3 coaxial connector, then passes (or not) through input attenuator R10,R13,R14, then via switches come to BPF board. It provides the DC reference voltages and currents needed to accurately position and balance the circuit at the point where it works best. The modification is simply breaking out the cap in the bottom of the can, so it can be retuned to 14 MHz using an external cap. The Fontana digital display mixer is a 3 way mixer control. It is intended for low cost, low power communication systems with signal frequencies to 500MHz and local oscillator frequencies as high as 200MHz. The 50ohm output of the mixer is impedance matched to 700 ohms. The mixer circuit I decided to start with in my receiver is a simple direct conversion mixer based on the popular SA612. Original: PDF. What concerns me is that it has no balance adjustment. DC Mixer with 4066 This circuit is a switching type mixer with the 74HC4066 analog switch. However, I thought the circuit seemed a bit complex for a simple function. from the VFO. The both work just fine. Applying the oscillator of the NE602 in low-power mixer applications 1991 Dec 151 Author: Donald Anderson INTRODUCTION For the designer of low power RF systems, the Philips Semiconductors NE602 mixer/oscillator provides mixer operation beyond 500MHz, a versatile oscillator capable of operation to 200MHz, and conversion gain, with only 2. The mixer U1 is another SA612. Ever since discovering that the Si5351 can output multiple independent clocks from one IC, I thought it would be. Unlike a passive diode mixer this has a fairly decent gain. This can be mounted adjacent to the first mixer. SA612AD/01,118 - RF Mixer IC Cellular, HF, VHF Up Converter 500MHz 8-SO from NXP USA Inc. While they're both balanced mixers, the SA612 doesn't seem intended for audio modulation. The resistor R1, therefore, is the current limiting resistor to protect the Zener D3. Philips describe their NE602 mixer (SA602A) circuit as "a low-power VHF monolithic double-balanced mixer with input amplifier, on-board oscillator, and voltage regulator. > 2019-07-03 13:19 : 30K: 1jz-s13-swap-cost. The SA605 superhet circuit works well enough that I may make a PCB layout for it. 40 m Band Superhet Receiver. But you say the IXD is high impedance input. Stereo Amplifier SA-612 Ampl/Mixer Monarch Electronics Int. The Front End. - System is pre-run and tested, with a documented cleanliness level OF ISO 17/15/13 as a minimum. RF mixer circuit symbol. I'm love making SW receivers. This is true when it is used as a 1st mixer in a radio design. Also the calculus to check that the requirements of transmitted power fixed by the International Civil Aviation Organization (ICAO) are made to test out the suitability of the receiver. mixer-part does'nt work, so I decided to test only the local oscillator. pdf The NE602, SA602, and the SA612 are basically the same kindof device. 8 volts on the wrong side of the 5 volt regulator, and the full voltage has felt by the SA612 chip. The resistor R1, therefore, is the current limiting resistor to protect the Zener D3. " The input impedance to an SA612 is about 1. Mixer gain 20dB. For example, the signal inputs In_A and In_B should be floating or. Many circuit designs use old and obsolete parts or appear to be too complicated for beginners. So I started with grand plans, to build a nice stable but cheap varactor controlled VFO about a month ago that tuned ~7. I had experience with the SA612 double-balanced mixer, but I did'nt want to. Because I wanted to use FETs in as many circuits as possible, I first had to determine the gain possible from a singly-balanced FET mixer. mixer 80m lpf gain ctl amp 1-80m out 100-200m pll 100m pll rf board block diagram system block diagram main controller pc async rf board d/a analog board keypad graphics controller graphics eeprom lcd ram power supply counter char lcd. The SA612A is a low-power VHF monolithic double-balanced mixer with on-board oscillator and voltage regulator. At 01-12-2017, you wrote: Beware ! Links are a scam! On 11/30/2017 4:56 AM, Jean-Matthieu F5RCT via Groups. The MC3362 also has buffered first and second local oscillator outputs and a comparator circuit for FSK detection. hawkins gØceu 57 28 hi z mic adaptor mike michaels w3ts 57 18 a ttl logic probe ken buck 58 6. You ask for a simpler approach: A XOR logic gate can function as a mixer (like SA612), or you can view it as a phase comparator. Diodes D1 and D2 function together as voltage controlled signal processor. Note that on the LEVEL 7 mixers, the slight degradation of specs when operated at a lower LO drive. Using the VCO and double balanced mixer of the SA612, can observe signals in the 100MHz range, on a 20MHz oscilloscope. Two more RF stages, comprising a 2N3053 and an IRF510 are on the second board. The first mixer in the MMR40 is a SA612 double-balanced mixer. It is a double balanced mixer that includes an oscillator that can be crystal-controlled, free running or even driven externally from a PLL, etc. [] In transmit mode, the SA612 is used as a sideband generator by mixing the audio with the carrier oscillator signal to produce an intermediate frequency of 11. What concerns me is that it has no balance adjustment. Typically they convert the higher frequency down to a frequency we can work with to recover the information in the signal. Mixers are used in a variety of RF/microwave applications, including military radar, cellular base stations, and more. An alternative 467 kHz IF mixer circuit; Schematic layout of DL5MGD's homebrewed mixer; PBC layout of DL5MGD's homebrewed mixer; DRM - Miniature Mixer Unit with crystal option. 350MHz upper single side band receiving of amateur radio transmissions. A product detector is really nothing more than a mixer. >the multiplier. I also want to try a dual gate mixer like the one used in a Heathkit SW-717. The NE/SA612A is a low-power VHF monolithic double-balanced mixer with on-board oscillator and voltage regulator. Product specification Replaces data of September 1990 IC17 Data Handbook 1997 Nov 07. (NOTE: U1 may be any one of a family of “mixers” and may be marked SA602, SA602A, SA612. The board layout follows the schematic of Fig 2 fairly closely. Anyone knows how can I get rid of this "Multiple Instances of Flag" error? Hierarchical schematics didn't. It is intended for high performance, low power communication systems. Greetings, Bertus. The architecture is a tweak on a classic bidirectional superhet board with twin SA612 mixers and a crystal filter. >the multiplier. - All hoses and fittings 3000 psi operating pressure rated. The remainder of the design is open source, and building from scratch is encouraged. 10x Ne602sa602 Rf Double Balanced Mixer And Oscillator Replaces Ne612sa612. I designed an SSB IF strip including a printed circuit board for this transceiver. The RF side of things really just needs to have enough gain to use a crummy antenna and decent rejection to AC and switching power supply junk. The tuner employs a mixer transistor and an oscillator transistor connected in circuit so that they form a single series path across the bias source. Niknejad University of California, Berkeley EECS 142 Lecture 20 p. Figure 4 is the circuit for the 24 MHz up- converter. Bubble #9: RF Front End & 1st Mixer · 2N7000 MOSFET switches to antenna through transmitter output · Manually adjusted dual-tuned circuit for Rx preselection · Familiar SA612 (nee NE602) mixer · Local oscillator provided by DDS with IF offset · Output at 4. The model I used for SA612 mixer and an ss is attached. It is impossible. Many circuit designs use old and obsolete parts or appear to be too complicated for beginners. Double-balanced mixer and oscillator SA612A 1997 Nov 07 2 853-0391 18662 DESCRIPTION The SA612A is a low-power VHF monolithic double-balanced mixer with on-board oscillator and voltage regulator. The NE602 through the SA612 series are all virtually identical Gilbert cell-based integrated circuits. The transceiver boasts a superhet receiver and uses a single mixer to combine the transmit BFO and VFO signals, producing (in my build) 7. For higher frequencies I would need a prescaler. 5 volts there. The architecture is a tweak on a classic bidirectional superhet board with twin SA612 mixers and a crystal filter. 15pcs Ic Philipssignetics Dip-8 Ne602an Ne602a. A varicap is a key element here, giving the ability to have the exact 90 degrees between two outputs of this circuit. Total Insurance PC Saver is uniquely engineered into the cord. The version we posted about recently was his “Production 3” version. The input circuit of the amplifier is a differential amplifier built around Q4 and Q5 that employ DC feedback thus preventing any DC voltage from appearing across the speaker with the usual destructive results. It is very simple to build: use ready-made STM32F746G DISCOVERY board from ST Microelectronics, and a small RF shield based on Si5351a frequency generator, couple of SA612 mixers and an opamp. Is the circuit shown below (view with fixed font such as Notepad) an acceptable way of connecting an opamp to a SA602 or SA612? Would the performance (whatever that might be) be improved with a high impedance load. The IC belongs to a family of the following ICs: NE602, SA602, NE612 and SA612. mixer and Bi-Quad filters / Power. If weusealocaloscillator frequencyof24MHz, thentheoutputofthe mixerwillcontainthe receivedsignalplus24 MHz. Some other less serious disadvantages apply to superhets, which are not related to the SA602 chip per se. The block diagram of the transceiver is given below. 7 MHz IF cans. The transmitter mixer output is filtered by a double tuned circuit, using modified 10. Cheap Price of USB to DMX Interface Adapter LED DMX512 Studio Computer PC Stage Lighting Controller Dimmer. -Justin N2TOH. While they're both balanced mixers, the SA612 doesn't seem intended for audio modulation. Pete showcased a nice simple rig on his web site that used a pair of SA612's in a bilateral circuit with one as the tx/rx mixer, and the other as the product detector / balanced modulator with relay switching of the IF filter between the inputs and outputs of the mixers. SA612 Mixer The heart of the receiver is the SA612A is a low-power monolithic double-balanced mixer with on-board oscillator and voltage regulator. mixer-part does'nt work, so I decided to test only the local oscillator. The VFO is a thing of absolute beauty. It is simply another mixer whose output is in the audio. 100 MHz HPF: 1, 2. The Sound Associates SA612 is a high-powered infrared emitter panel. This would include both fixed and variable oscillators as well as fixed and variable crystal oscillators - all in the HF region. The SA612 is a poor performer in the RX mixer position under strong signal. 10x Ne602sa602 Rf Double Balanced Mixer And Oscillator Replaces Ne612sa612. Dan, I like your work here. Frequency of interest 10 MHz. The story didn’t end with the R1, for Rick crunched the math, made careful experiments and raised the bar with his follow-on; the R2 which contained an image-reject mixer. Mischer (englisch mixer) werden in der Kommunikationstechnik zur Frequenzumsetzung (englisch frequency conversion) von elektrischen Signalen verwendet. Horrabin G3BSI and tested by many other hams : its input IP3 is around +40 dBm, a noteworthy and uncommon value for ham equipment. Explore Integrated Circuits (ICs) on Octopart: the fastest source for datasheets, pricing, specs and availability. 5Vdc instead of 5V) on this build…it’s worked well in past projects. The VFO is an Alan Lake design for 80m with the L/C of the tuned circuit changed to give an output of 7. We have the world's largest database of circuit diagram. The xx612 is a low power, high gain device. Ideal would be a quartz version as this offers best stability and accurate resonating frequency of the mixer. Philips SemiconductorsProduct specificationSA612ADouble-balanced mixer and oscillator1997 Nov 075Besides excellent low power performance well into VHF, theSA612A is designed to be flexible. 1µF depending on frequency. Un ampli d’adaptation, donc vous trouverez le schéma ici, est nécessaire. The lowest active component count for such a transmitter is one transistor. Consequently a buffer amplifier of some sort is needed. The modification is simply breaking out the cap in the bottom of the can, so it can be retuned to 14 MHz using an external cap. There is around 5dB of loss in mixing, and then 22dB of gain, leaving a net 15dB gain with over 5dB noise figure (because of the mixer). The VFO is an Alan Lake design for 80m with the L/C of the tuned circuit changed to give an output of 7. C9 should be adjusted for maximum signal strength. "The voltage is rather low (~300mV P-P) but it drives active mixers (e. Some time back, a very generous ham in Oregon gave me a sizeable quantity of SA602 and SA604 SMT IC’s. The SA612 is a double-balanced mixer and oscillator (see data sheets). Again, an opamp buffer is included on the audio input to offer a high input impedance and drive the mixer. Again I made a PCB using Express PCB and the iron-on method. DSB modulator with NE602 SA602 SA612 Lucian Ioan Papadopol. Very interesting information. VI which is the voltage across the known resistor and related to the current. One Column; One Column (Big Image) Full-width Portfolio. For oscillations to exist an oscillator circuit MUST contain a reactive (frequency-dependant) component either an “Inductor”, (L) or a “Capacitor”, (C) as well as a DC power source. Mouser offers inventory, pricing, & datasheets for sa602. 5 MC (for WWV at 5. This long story will prove that NE602 = SA602 = NE612 = SA612 (for those of you who don't want the gory details -hi) The original NE602 was designed/manufactured by SIGNETICS for the 45MHz FM wireless telephone market. In addition to its basic application as a balanced modulator/demodulator, the device offers excellent performance as an SSB product detector, AM modulator/detector, FM detector, mixer, frequency doubler, phase detector, and more. SSB Demodulation Techniques. From the antenna, the signal is passed through the crystal filter to a FET amplifier. The antenna is link coupled to T2 while the output is fed from a tap on the tuned primary winding of T3 to provide proper impedance matching. Thank you readers for your overwhelming response to our previous guide (Nov 09) about upcoming bank exams. RF amplifier. I say 'was', as I lost record of his company's involvement in Drake equipment roughly in the mid 1980's. It is simply another mixer whose output is in the audio. See more ideas about Mixers, Mixer and Analog devices. It is intended for low cost, low power communication systems with signal frequencies to 500MHz and local oscillator frequencies as high as 200MHz. sa602 are available at Mouser Electronics. TS590 may not has it. as found in most op-amp circuits. You transistor radio contains tuned circuits that are specific to the bands they cover. 4 RECEIVE MIXER Signals from the antenna are applied to a bandpass filter formed with two transformers T2, T3 and capacitors C21, C22 and C23. The heart of the circuit shown here is an IC which goes by the name NE602, NE612 or SA612. This would include both fixed and variable oscillators as well as fixed and variable crystal oscillators - all in the HF region. Here, the input comes in from the output of the 4 MHz crystal filter to pin 2. Provision is made for exalted carrier reception. A product detector is really nothing more than a mixer. I used it. SSB Demodulation Techniques. Pins 4 and 5 are the output pins, here you connect a tuned circuit to get the mixed result. [17:11] yeah [17:12] I used them with no problem [17:12] I got old pal modulator from cable tv frontend [17:12] check SA612 you'll find it more easily [17:12] farnell and mouser have some [17:12] philips ne612AN in the middle of it [17:12] much faster way than ordering [17:13] I had an idea some month ago fetching all the components I have for. · Microwave Mixers · Stripline Quadrature Microwave Mixers · High IP3 Mixer +40dBm - IK4AUY · 1296 MHz Diode Mixer - WA6UAM · Dual-FET HF Mixer · High Dynamic Range HF Mixer · High IP3 (33dBm) BJT Mixer · 900 MHz BJT Gilbert Mixer. One of the op amp circuits is shown in Figure 4. Some other less serious disadvantages apply to superhets, which are not related to the SA602 chip per se. Figure 3 shows the input protection circuit of the AIM430. as found in most op-amp circuits. In addition to its basic application as a balanced modulator/demodulator, the device offers excellent performance as an SSB product detector, AM modulator/detector, FM detector, mixer, frequency doubler, phase detector, and more. Practically, however, mixers often display some very non-ideal characteristics (e. Using the PTT will now activate a 600 Hz tone which is injected into the microphone circuit to modulate the rig. An active antenna is a pure capacitor and its capacity should be at least a few times larger than the input capacitance of the circuit amplifier. I realized the receiver in the manhattan style circuit technique. I've never used popular LM386 because it has a high noisy level. DESCRIPTION. Pin 1 and Pin 2 are signal inputs; Pin 3 is ground; Pin 4 and Pin 5 are mixer outputs. From all circuits I found, there are two, more or less close to what I intend to build winding my own coils. I was intrigued enough to contact the designer Glen Leinweber VE3DNL and with a few modifications to his design came up with the following circuit which performs remarkably well. Double-balanced mixer and oscillator SA602A 1997 Nov 07 11 Philips Semiconductors and Philips Electronics North America Corporation reserve the right to make changes, without notice, in the products, including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. US Stock 2pcs SA612AN SA612 DIP-8 Mixer & Oscillator in Business & Industrial, Electrical Equipment & Supplies, Electronic Components & Semiconductors, Semiconductors & Actives, Integrated Circuits (ICs), Other Integrated Circuits | eBay. Here's something we've needed for a long time: an LTSpice model for the ever-popular NE602/SA612 chip. An alternative 467 kHz IF mixer circuit; Schematic layout of DL5MGD's homebrewed mixer; PBC layout of DL5MGD's homebrewed mixer; DRM - Miniature Mixer Unit with crystal option. Receiver for Jupiter Mixer The Mixer used in this receiver is Philips SA612. C9 100pf = 101 C10 100pf = 101 C20. More details for ADE-5 can be seen below. 3 dB, P1dB 1. This does work and I copied strong CW and SSB signals. I use the recommended Colpitts circuit for synthesizer applications (Figure 8 of data sheet). Simple Mixer with 4 Input Circuit diagram : A basic mixer suitable for mixing microphones or even effects outputs. Here, the input comes in from the output of the 4 MHz crystal filter to pin 2. 05 MHz Product Detector RX (high) RX -TX = 800 Hz AF Amp BP Filter AF Out NE5532 The Product Detector The product detector’s job is to convert an incoming signal from RF frequencies to audio frequencies. We can identify three subclasses of circuits, sharing certain similarities. An alternative 467 kHz IF mixer circuit; Schematic layout of DL5MGD's homebrewed mixer; PBC layout of DL5MGD's homebrewed mixer; DRM - Miniature Mixer Unit with crystal option. The above circuit was clearly designed to go on the end of a 455 kHz or higher IF strip. The schematics I got started with for my first build are over on George Smart's wiki. Hi all, sorry for this late note, but I sent it in html and resulted in a too large file. 4 MHz signal. Again, the small yellow caps are installed first followed by the resistors and diode. The data-sheet figure for 45MHz is -13dBm. K3 has an image noise filter (2 xtals â€" BW 14kHz) to reduce noise generated by the IF amplifier entering the second mixer. Hello, for my receiver I want to use an SA612 as a mixer, but the test of the 1. The numbers in this data sheet are typical measurements in our laboratory, and not guaranteed. The coil has 100 uH, high Q, capacitor 1000 pF styroflex, for first experiments no varactor. A milliwatt level TX can be made by feeding audio to a diode mixer either from a carbon microphone circuit or an audio amplifier such as the LM386. His upconverter uses a 100 MHz crystal oscillator that brings frequencies between 0-30 MHz up to a range of 100 – 130 MHz, which is in the receivable range of the RTL-SDR. Its internal circuits is this: Internally the circuit has three Bias circuits which set it up in the right conditions. It is a well-known "low cost" mixer. The NE612 is an integrated circuit which contains a balanced mixer with its own on-board local oscillator and voltage regulator. Replaces data of September 17, 1990. - Circuit breaker panel for heater/valve stand operation (pre-wired to generator). All the part names for which the file SA612. HAM Sample and Hold SDR (Software Defined Radio) Modulator/Transmitter for DSB, SSB, CW, AM, FM, DRM. While accurate analog multiplier circuits can be designed, they do not provide high. The block diagram of the transceiver is given below. This I s my little AD9850, Arduino, NE602 super-heterodyne all band receiver. The both work just fine. I've never used popular LM386 because it has a high noisy level. Next, it is fed to one input (pin 1) of U2 — the SA612 mixer. The linear detector is on the part of the PC board in the foreground, and the TO220 package to the left of it is an LM317 voltage regulator for the 6V power rail. The modification is simply breaking out the cap in the bottom of the can, so it can be retuned to 14 MHz using an external cap. 5 uHy inductance will do the job. It has an oscillator at pins 6 & 7, inputs at pins 1 & 2, and outputs at pins 4 & 5. If the author remembers well an article that he read in a professional magazine many years ago, the synchrodyne receiver is the ancestor of the superheterodyne receiver. Q1 and Q2 accept one of the mixer's input - in our case 3Mhz. The schematic of a receiver I call the Simple Superhet is shown in Figure 3. DRM frequency list and schedule. - Circuit breaker panel for heater/valve stand operation (pre-wired to generator). Homebrew RF Circuit Design Ideas "There is no such thing as a new idea. Consequently a buffer amplifier of some sort is needed. It is intended for low cost, low-power communication systems with signal frequencies to 500 MHz and local oscillator frequencies as high as 200 MHz. The 17-meter transceiver project is underway. The requirements laid down in Article 11(2) of Directive 97/13/EC of the European Parliament and of the Council of 10 April 1997 on a common framework for general authorisations and individual licences in the field of telecommunications — under which a charge imposed on operators of telecommunications services for the use of scarce resources must seek to ensure optimal use of those resources. Explore Integrated Circuits (ICs) on Octopart: the fastest source for datasheets, pricing, specs and availability. I realized the receiver in the manhattan style circuit technique. The electrical circuit as it described below in the manual is intended for 14. As you can see, it’s running on 9V batteries! The frequency counter has its own 9V battery and a spiffy new hand-me-down case (originally used for a power supply I think, before which it was a watch case!). Direct Conversion Receiver using NE612 for HF Bands The NE612 is an integrated circuit which contains a balanced mixer with its own on-board local oscillator and voltage regulator. It is a double balanced mixer that includes an oscillator that can be crystal-controlled, free running or even driven externally from a PLL, etc. Since last time I redesigned the filters to match 50Ω to 1500Ω of the sa612 mixer. Applying the oscillator of the NE602 in low-power mixer applications 1991 Dec 151 Author: Donald Anderson INTRODUCTION For the designer of low power RF systems, the Philips Semiconductors NE602 mixer/oscillator provides mixer operation beyond 500MHz, a versatile oscillator capable of operation to 200MHz, and conversion gain, with only 2. The dif ferential input stage. The IC1 doubles as receive and transmit mixer and IC2 acts as product detector and balanced modulator. The data-sheet figure for 45MHz is -13dBm. 1 and 2: differential input 3: minus power suply 4 and 5: differential output. In a hurry? Skip straight to table of contents. 4 MHz signal. I used single in-line package (SIP) header pins and a shorting plug. Share EAGLE library. hi everbody i have sa612 mixer and oscillator IC. The signal of the VCO in the 4046 is buffered by feeding it into the internal phase detector. The resistor R1, therefore, is the current limiting resistor to protect the Zener D3. Here is a description of the circuit in Figure 5. The differential outputs of the mixers are connected to opamps through dc blocking capacitors. Hello, I am using SA612 mixer for down conversion, Before the mixer I have image filter that is designed using coupled resonators. In the picture above, VFO circuit is located on the right, RX on the left. Product specification Replaces data of September 1990 IC17 Data Handbook 1997 Nov 07. One column; Two Column; Two Column (Light) Three Column. It is a double balanced mixer that includes an oscillator that can be crystal-controlled, free running or even driven externally from a PLL, etc. Crystals for the mixer are easy to find also when using either a 10. The audio level into the SA602 mixer should be about 200 mV. It was built into a shielded enclosure with smc connectors and uses a hand made double sided pcb with a ground plane built into an old tuner casing. Impedance matching is familiar to most Amateurs because antennas have to be matched to transmitters. Schematics and C code for a 0-5V PIC LCD volt meter ; Schematics and C code for a PIC frequency counter operating up to about 50 MHz (7 segment) Schematics and C code for a PIC frequency counter operating up to about 50 MHz (LCD) Self Oscillating Amplifier for Distortion Testing. I'm not going to describe these two modules in greater detail because I recommend using a commercial VCO such as the Mini-Circuits POS-300 instead. Very interesting information. The output of this circuit is taken from R7 and/or R8. mixer-part does'nt work, so I decided to test only the local oscillator. The AD608 chip combines an active mixer and a logamp/limiter into one “receiver if subsystem” package. The actual decoder is built around a dsPIC 2011. Some of these circuits tried did hear QRSS signals well but overloaded easily and blanked out with strong adjacent signals which we always have to contend. A direct-conversion receiver (DCR), also known as homodyne, synchrodyne, or zero-IF receiver, is a radio receiver design that demodulates the incoming radio signal using synchronous detection driven by a local oscillator whose frequency is identical to, or very close to the carrier frequency of the intended signal. SSB sig-nal generation in the transmitter part of radio station and nal stage power ampli cation are depicted. I designed an SSB IF strip including a printed circuit board for this transceiver. This double-balanced mixer can be driven by a single-ended LO source and requires only -2dBm of LO power. The basic kit comes with two crystals so the builder can choose conversion to either 4 MHz or 10 Mhz. The SA605 superhet circuit works well enough that I may make a PCB layout for it. 1 Watts of RF into the usual 50 Ohm load. Typically they convert the higher frequency down to a frequency we can work with to recover the information in the signal. At 01-12-2017, you wrote: Beware ! Links are a scam! On 11/30/2017 4:56 AM, Jean-Matthieu F5RCT via Groups. Its limiter function has been investigated in an AM/PM circuit, in addition to a 53MHz synchronous detector with the AD831 active mixer. The amplitude of the audio out is surprising. By the addition of one integrated circuit and some passive components, I was able to convert my earlier developed 40-meter direct conversion receiver design into a superhet model. The less complex designs are direct conversion, while more com-plex designs use an intermediate fre-quency (IF), say 5 MHz, and add a crystal filter for selectivity. NXP sa612 RF Mixer are available at Mouser Electronics. It is not a particularly good choice as a product detector in a superhet. Here's something we've needed for a long time: an LTSpice model for the ever-popular NE602/SA612 chip. With addition of the TA7642, increased simplicity of the circuit, contributing with IF high gain, selectivity and demodulation for AM signals. voltage on pin 8 of both the SA612's If everything was put together properly you should see something close to 7. A TAK-3H mixer may be substituted if higher dynamic range is needed (see text). An extra cost option will convert to 14 MHz. The SA612 is a good mixer, but has its limitations. The key RF mixer circuit symbol shows the two signals entering circuit block consisting of a circle with a cross or "X" within it. I'm designing a HF transceiver and I'm going to use SA612/NE612 as a product detector. The data-sheet figure for 45MHz is -13dBm. Change C52 to. I've never used popular LM386 because it has a high noisy level. It is impossible. I've expanded and somewhat redesigned mine to include switchable filters, gain control, antenna selection, and frequency stabilization. The 17-meter transceiver project is underway. Internal bias saves you having to use external components. This project started as a Wee Willy DSB Transceiver for 40Metres which means it is a direct conversion receiver using an NE602 as the mixer. This superheterodyne for medium wave has a crystal filter with about 6 kHz bandwith an a center frequency of 4,4 MHz, which is is also the IF. 000MHz - 14. The SA615 combines the functions of the SA602 and SA604A but has higher performance. Hello, I am using SA612 mixer for down conversion, Before the mixer I have image filter that is designed using coupled resonators. Crystals for the mixer are easy to find also when using either a 10. Transistors Q10 and Q11 act as. The output impedance of the SA612 is about 1500 ?. The MC3362 also has buffered first and second local oscillator outputs and a comparator circuit for FSK detection. The less complex designs are direct conversion, while more com-plex designs use an intermediate fre-quency (IF), say 5 MHz, and add a crystal filter for selectivity. DESCRIPTION. SA602, SA612 Mixer This side will present some of my ongoing 612 project. It is intended for high-performance, low-power communication systems. Receiver for Jupiter Mixer The Mixer used in this receiver is Philips SA612. Typically they convert the higher frequency down to a frequency we can work with to recover the information in the signal. In a simple inductor-capacitor, LC circuit, oscillations become damped over time due to component and circuit losses. About the MF-LF converter/mixer: This is a very sensitive homemade MF converter/interface allowing you to receive the DRM radio (Digital Radio Mondiale) with your general coverage receiver and a soundcard. Nuts & Volts is written for the hands-on hobbyist, design engineer, technician, and experimenter. The linear detector is on the part of the PC board in the foreground, and the TO220 package to the left of it is an LM317 voltage regulator for the 6 V power rail.