Stereo Receiver User Manual

HR40 • 14
INITIAL TESTING OF YOUR HR40:
You’re now ready to power up and test your HR40, but before you begin take
some time to sweep off your bench of any loose component leads or solder
splashes. A clean work area not only makes testing less frustrating but also
less prone to problems.
REQUIRED FOR INITIAL TESTING AND ALIGNMENT:
A known frequency standard in the 10MHz range such as:
• Crystal oscillator or,
• RF signal generator or,
• Grid Dip oscillator or,
• QRP transmitter such as a Ramsey QRP-40
• A Ramsey frequency counter (CT-90, etc) or,
• Any accurately calibrated receiver covering 40 meters
• At the least, personal familiarity with the 40 Meter Ham band
And the following:
• Coil alignment tool ( can be homemade per directions) and
• 9-volt battery, antenna earphones or a small speaker.
Connect the following:
 Fresh, 9-volt battery.
 Earphone or speaker.
 Antenna or at least a random length of wire.
 Adjust the three controls to the middle of their ranges.
 Press the power switch “on”. You should hear background noise
immediately, at least a gentle hiss.
 See if the volume control does its job, vary it and notice how the volume
changes.
 See if the RF gain control has some effect on what you hear.
 If everything seems ok so far, feel the tops of the two IC's with your finger.
Neither should feel hot or warm
 Slowly rotate the tuning control. At this point you may or may not hear
anything, since neither coil has been adjusted. If you do hear a few
whistles as you tune, the SA602 oscillator is working just fine.
 These simple initial checks verify that your receiver is operating well
enough to proceed to the next section, alignment.