As an example, a receive frequency of 146.94 MHz requires a mixer frequency of (146.94 - 11.2) or 135.74 MHz. To adjust for a room temperature of 71 degrees add (135.74 * .2), or 27 hertz to the injection frequency of 135.74.

After the radio has been in operation for a month or so, re-net the receive and transmit crystals and then again in about six months...... This will compensate for crystal aging.