Ramsey Electronics HR30 Instruction Manual - page 15
HR30
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15
These simple initial checks verify that your receiver is operating well enough to
proceed to the next section, alignment.
Alignment:
Turn on whatever reference signal source you plan to use. This can be a
regular transceiver keying a few milliwatts into a dummy load, a crystal
oscillator or a signal generator. Or, you can look for a known signal that you
have tuned in on another receiver.
If you are without any reference signal whatsoever but have a reasonable
antenna , you can use your familiarity with the 30m band to make a rough
alignment of the receiver. If ham radio and 30 meters are new to you, here’s a
rough idea of what you can expect to hear on this busy band.
10.00 - 10.000 MHz Commercial RTTY, CW
10.100 - 10.150 Amateur radio CW and RTTY QSO’s
NOTE: A miniature transformer alignment tool is used to turn the slugs in L1
and L2. If you do not have one, make one by gently sanding the tip of a wooden
match stick, a kabob skewer or other piece of wood or plastic. While it seems
that a small jeweler’s screwdriver could be used, be aware that its metallic
construction will make adjustments of L2 very erratic and could damage the
powdered iron slug. Any kind of metal tip will affect the coils true value, so that
the oscillator will run at one frequency with the metal instrument in the coil can,
and a completely different frequency by itself.
❒
For now, set the tuning control to its mid-point. Use the insulated alignment
tool to gently rotate the slug in the top of L2. If it starts to get tight , DO NOT
FORCE IT! Instead gently rock it back and forth until it loosens up. You
should find your 10MHz reference over a range of approximately 5 to 9
MHz. The varactor tuning control can cover any 300 KHz range chosen
within the 5 to 9MHz limits.
❒
Adjust L1 for maximum received signal strength. Now you’re ready to
receive on-the-air signals! After you get used to its tuning and performance,
you can adjust the tuning control, L1 and L2 to get the exact tuning range
you want.