Ramsey Electronics QRP-80 Manual de instrucciones descargar pdf (Pagina 15)

HR-80• 15

and L2 to get the exact tuning range you want.

ALIGNMENT HINT FOR ALL DIRECT CONVERSION RECEIVERS:

You will clearly hear the oscillator of your kit - very close to its

receiving frequency, if you tune around for it on ANY shortwave radio

covering the same frequency range. Even if your shortwave set does

not have a BFO (beat frequency oscillator) for CW-SSB, you’ll still

hear a powerful ‘hiss or quieting’ when your shortwave receiver is

tuned near the frequency of the HR-80. Your shortwave receiver is

actually picking up the oscillator signal within the HR-80!

USING YOUR RECEIVER:

In your first tests, you might feel that tuning in CW and SSB stations

by turning the control shaft seems tricky. Don't despair! The addition

of a simple knob to the final version of your kit will result in more

comfortable tuning right away. Also, the larger the knob, the easier

the tuning is. Even smoother control can be accomplished by a

vernier dial, which will also provide calibration marks. Finally, if you

intend to use this receiver only for monitoring or working a very

specific frequency range, you can add a resistor in series with the

tuning control to achieve the bandspread you want for your own

application. For details, please see the upcoming section, Notes to

Experienced QRP Builders.

We want you to enjoy this economical receiver, whether you use it

for portable listening or as a base for easy experimentation. Isn’t it

amazing the performance that can be achieved with just two IC

chips?

• TUNING SSB SIGNALS

As you know, the protocol for the 160 - 80 - 40 Meter Bands is lower

sideband (LSB), with Upper Sideband (USB) used for 80 - 18 - 15 -

12 - 10 Meter SSB.To check or ‘scan’ a given band for SSB signals,

tune your HR-80 up from the low end for USB signals and down

from the high end for LSB.

• CW OPERATION

A direct-conversion receiver lets you hear equal ‘sidebands’ on either

side of the zero-beat ‘null’ of the exact frequency of the signal to

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Ramsey Electronics QRP-80 Manual de instrucciones Pagina 15