Crystals
Beware of amateur grade crystals advertised in ham magazines. Many do not have good enough calibration tolerance or stability. Insist on only commercial grade crystals for any 2-way radio equipment. Frequency stability for crystal controlled transmitters and receivers consists of a commercial-grade crystal with a rating of ±5 ppm over a temperature range of +10°C to +60°C (50°F to 140°F). Note that crystal ovens, for wider temperature range, are no longer available. Crystals, commercial grade, for all units $25.00 (allow 2-3 weeks for manufacture) Synthesized RadiosOur synthesized radios do not require channel crystals or crystal ovens. Synthesized radios come standard with temperature compensated crystal oscillators (TCXO), which provide ±2 ppm stability over a temperature range of +10°C to +60°C (50°F to 140°F) without requiring a crystal oven. That is a major advantage of synthesized modules vs. crystal controlled. Replacement micros for synthesized units are available for $20.00 |
We use only good quality, commercial grade crystals of 5 ppm tolerance from the best crystal labs. Normal delivery time is about 2-3 weeks because the best crystals are aged to provide good stability over a period of time.