Steve Bosshard (NU5D) wrote: > Cheep Service Monitor - Take a receiver and an oscilloscope and calibrate > the scope to measure transmitter deviation. Then use an inexpensive > frequency counter. For receiver testing find a surplus generator and > use it > with the counter and home made deviation meter (receiver / scope > combination). Filter / cavity duplexer tuning will not be as easy, but it > can be done. Better yet if the receiver has a discriminator zero output > for > freq setting. > > Steve NU5D
Yeah-there you go. With careful setup and double-checking to a known reference, it should work fine! By the way-a good frequency reference now is the 929-932 Mhz paging systems. They are GPS synch'd to the point that even with the ultra high-stab oscillator in an IFR-1200SS, we could use the paging tx to calibrate the monitor, cause it's more accurate! Just watch out for the modulation swings! -- Jim Barbour WD8CHL
