Thursday, November 7, 2013

40 meter QRP transmitter

This is my first working DSB modulator. It uses two TA7358AP ic as modulator and mixer. Audio ic LM741 is used as af amp.

LM7805 voltage regulator used. 2N2222a is used as tuned RF amplifier that reduces the spurious mixer products and gives the clean signal.

After sometime some fault appeared with veroboard and it went blank. So the project of going DSB over 40 meter was stopped as there was no compatible receiver for it.

(But, however this again reborn in Jan2015 ad 14195kc dsb exciter. )