Bob

The idea is a keyed CW oscillator on 7.010 MHz with harmonics on 14.020, 21.030 and 28.040 MHz.

As an HF operator may I suggest you have a base frequency of 7.020 or higher rather than 7010. The lower parts of the bands can get quite congested at times so this would give ground stations a better chance of hearing them. Certainly 7.020 is often occupied.

73 Richard G3RWL