IF Tuned Inductor Coil 10.7 MHz Filter Quadrature Demodulator CA3189 NE602 For Sale -

This list is for an of LOT of 6 PCS
Two Pink Two Green Two Yellow
10.7 MHz IF Tuned Coils
TESTED at 10.7 MHz!
Great for use with LM3189, CA3089, NE602QUADRATURE DETECTOR MHz Tuned Inductor Coil - NOS - 7mm CAN
LOT of 6 PCS 7mm CAN
( Please, See Pictures quadrature demodulator basics

The basic format of the quadrature detector is shown below.

It can be seen that the signal is split into two components. One of these passes through a network that provides a basic 90° phase shift, plus an element of phase shift dependent upon the deviation.

The original signal and the phase shifted signal are then passed into a multiplier or mixer.

Quadrature FM demodulator circuit

The mixer output is dependent upon the phase difference between the two signals, i.e. it acts as a phase detector and produces a voltage output that is proportional to the phase difference and hence to the level of deviation on the signal.

Mixer phase response for quadrature FM detector

If the operation of the system is designed to ensure that the deviation remains well away from the ±90° points, then the linearity remains very good.

In terms of performance, the quadrature detector is able to operate with relatively low input levels, typically down to levels of around 100 microvolts and it is very easy to set up requiring only the phase shift network to be tuned to the centre frequency of the expected signal. It also provides good linearity and this results in low levels of distortion.

Coincidence FM demodulator

Often the analogue multiplier is replaced by a logic AND gate and the input signal is hard limited to produce a variable frequency pulse waveform.

FM coincidence demodulator using an AND gate

The operation of the circuit is fundamentally the same, but it is known as a coincidence detector. Also the output of the AND gate has an integrator to 'average' the output waveform to provide the required audio output, otherwise it would consist of a series of square wave be sure to see all my list, on thelink the 10.7MHz coil PINK, if you need that it work like an IF tuned transformer, is easy to disassembly to do this!
The simple task is remove the CAN and add five turns of the same wire, above of the existing winding coil, avoiding overlapping the coils.
Use the two available terminals and to solder the wires.
After that, reassembly the CAN, and you have now, the 10.7MHz tuned transformer.
You can add or reduce the number of the turns, to modify the impedance ratio.
In this example, I use the PINK coil, and the impedance ratio is about 4:1 ( the primary have 10 turns ).
Some of the coils have an bit of wax inside, be carefull in all process!
I do not offer any warranty or guarantee about this process, but that I did worked well!
Please, see the photo of the opened, and modified coil I did for examples purpose!
PLEASE!

• I will ship the package via registered economic airmail letter, it is cheap, but may be slow!
• I will inform the tracking number, for this registered airmail letter.
• Import taxes and duty are not included in the price or shipping fees, buyer should pay for it.
  
• To USA, Canada and most parts of Europe, the arrive time varies about 25 to 45 working days.
• To the other countries, the time can be over 45 to 60 working days!
• Customs process is other delay cause.
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