QSK once again how to make qsk ?

     QSK

Once again i am making the QSK for the earlier made qrp  7.159 mhz vxo controlled cw transceiver. It had only simple switching and was good enough for doing tuing tuing carriers tones. but for the effective cw use you need FULL BREAK-IN QSK. 

I have found the problem why it did not work on air ? faulty dipole antenna coaxial wire. It had aluminium foil which does nto work , i should have used the copper one. dump it and will make a long wire or half-wave from that dipole install and remove the wire. let's see.

how i checked the dipole ? with the 40 meter receiver it was producing more noice then signal and with even a small house antenaa wire it produced less signal and ok volume. so that coaxial has been aproblem. sometimes it takes lots of time to find the true problem.

this time i will brew a linear for 80/40 also so that i can use the 3.686 kc system as well as 7.159 system. you need atleast 15 watts. and the 50 watts are good thing. the single FET IRF840 can produce it easily with 28 volt power supply.

before the linear is made atleast i should have the trx fully ready so this qsk. 

THE CKT.

here is the circuit. its actuall and revised from the earlier version as i changed the components.

QSK revised

The components are placed on the veroboard. I like to use veroboard for this part as it is DC control section and veroboard holes provides easy to put components. Here we are taking the two output one is with delayed on/off control of the  relay. the delay is important. Two diodes are used to clamp the capacitor discharge voltage to a set minimum. It helps quick switching off the relay.
 

component placement !! work in progress

it will be finished and then uploaded the result.  

to be continued.....