Once your Station has been set up for SSTV Its a good idea to make several test

 transmissions at full power into a dummy load .Then you can see whether the rig (and if used the Linear ) are adjusted correctly for this 100% duty cycle mode.

Once this is done its good practice to transmit on fairly low power on the antenna on A FREE frequency and LISTEN on a receiver to ensure the tones sent are not distorted repeat this at full power and look for signs of any RF breakthrough into Your computer or its monitor whilst on air.

If RF does get in try and see which lead is carrying it and filter that lead with ferrite rings

 Or as I have found useful wrap the whole length of lead with old video tape as this tends to reduce pickup a lot a Balanced antenna on hf reduces these problems as does open wire feeder and a good ATU.

For a final check work a station or two and ask for critical comments most will send

 you a test card to allow you to check you are receiving straight .Generally if the receiver is straight the transmitter will also be sending straight pictures . On the occasion this does not hold true the better software�s allow adjustment in the software to ensure the transmit does comply ( Read the Help files Gents! )

G0VFU Frank

 G3KLV Gordon