So, the latest SlowJT9 test is completed. I regret I was not able to run one night on 630m as planned. I used a QRP Labs Ultimate 3S beacon transmitter for these tests. Yesterday I checked my ability
Paul For idea 3, a pair of 74LS90 or similar /10 chips will do it The absolute frequency instability at 13.6MHz may be worse than at 136KHz from the rig, depending on what mixing / multiplication is