WildCat FM /technical station.
attic of station's chief /Top floor /White Room
FM stereo matrix generator

The modulator of the matrix method was produced by using "double balanced mixer TI/SN76514"
it is please by there is an interest the introduction in the experiment,
the production of FM stereo matrix generator, and the verification report.

 
 

The main board is changes every day because it is an experiment.

It connects with the transmitter and it auditions.
Please see the verification report for tone quality and the performance. !!
 
 

frequency response with 10Hz to15KHz +/- 0.5dB. Use SONY SA5ES
Though the problem remains in the ability of VCO of the transmitter used to test
20Hz to 10KHz=-40dB,....All standards are filled.

The circuit design of L-R that uses usual OP.AMP is verified again, and the balance input of double balanced mixer is used. L-R is synthesized at the same time in balanced mixer, and the circuit passing is omitted by one step by an original circuit design, and the phase delay and the tone quality deterioration with an active element are reduced.
 
 

in the coarse adjustment, FM linear detector and the photograph of the wave form were taken temporarily and seen.

The signal is in beauty.
 
 

it is not a way where MPX of the SW method is rough. Because the first sine wave has been synthesized, a clean signal is promoted. generating a high quality FM stereo multiplex signal is in beauty.
 
 
 

if the page after the future is seen, whether in - what this paging it ..it is.. means White Room is understood, and thought by most fellows that the head whitens in the thing.
 
 
 
 
 

Person who wants to emit good sound from FM transmitter and to see.!
person who wants to secede from "Toy transmitter" for mini FM.!!
You who has pride as broadcasting because of sound of the highest.!

Person who wants to broadcast because of sound at professional level. !

FM stereo MPX signal is you ardent who wants to clarify something. !!

Take if there is a your motivation.
FM stereo matrix generator /1  Production of pilot signal and subcarrier generation circuit
 
 
 

FM stereo matrix generator /1  Production of pilot signal and subcarrier generation circuit
FM stereo matrix generator /2  Production of L-R, L+R circuit, and Balanced modulator circuit
FM stereo matrix generator /3  Production of Pre-emphasis /input filter/buffer amplifier circuit
FM stereo matrix generator /4  Connection to VCO/exciters and phase of pilot signal
FM stereo matrix generator /5  FM stereo modulation signal Spectrum seen from side of electric wave
 
 

document of yamamoto by WildCat FM