26-10-2017, 06:10 PM
Richard, just to confirm, if you want to check the RF/IF stages with a signal generator then a modulated signal is best as any sound can be instantly heard if the detector and AF stages are working ok, you can check without modulation but it would mean monitoring the output of the detector with a DC meter or a 'scope set to DC and you would also need to be able to "interpret" the result(s)
For sure the best type of generator for injecting RF/IF is one that has built in modulation facilities, that is, one that contains it's own internal AF oscillator (usually oscillating at a fixed frequency such as 400Hz or 1kHz or there about) that can be switched in to modulate the RF/IF carrier that's generated within, you'll struggle without one if you want get into all this radio stuff, they can be broadly cast as two types, AM signal generator and FM signal generator, an AM signal generator is the most useful for most needs.
This post might cross.
Lawrence.
For sure the best type of generator for injecting RF/IF is one that has built in modulation facilities, that is, one that contains it's own internal AF oscillator (usually oscillating at a fixed frequency such as 400Hz or 1kHz or there about) that can be switched in to modulate the RF/IF carrier that's generated within, you'll struggle without one if you want get into all this radio stuff, they can be broadly cast as two types, AM signal generator and FM signal generator, an AM signal generator is the most useful for most needs.
This post might cross.
Lawrence.
