Ramsey Electronics HR40 - Manual (Page 14)

HR40
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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
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A Ramsey frequency counter (CT-90, etc) or,
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Any accurately calibrated receiver covering 40 meters
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At the least, personal familiarity with the 40 Meter Ham band
And the following:
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Coil alignment tool ( can be homemade per directions) and
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9-volt battery, antenna earphones or a small speaker.
Connect the following:
ˆ
Fresh, 9-volt battery.
ˆ Earphone or speaker.
ˆ Antenna or at least a random length of wire.
ˆ Adjust the three controls to the middle of their ranges.
ˆ Press the power switch “on”. You should hear background noise
immediately, at least a gentle hiss.
ˆ See if the volume control does its job, vary it and notice how the volume
changes.
ˆ See if the RF gain control has some effect on what you hear.
ˆ If everything seems ok so far, feel the tops of the two IC's with your finger.
Neither should feel hot or warm
ˆ 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.
ˆ These simple initial checks verify that your receiver is operating well
enough to proceed to the next section, alignment.