Ramsey Electronics QRP-80 Manual de instrucciones descargar pdf (Pagina 19)

HR-80• 19

A careful check of all construction WILL solve your problem. Over

95% of the kits returned for repair have nothing more than a simple

assembly or construction error!

GENERAL NOTES FOR EXPERIENCED QRP BUILDERS:

We at Ramsey Electronics deliberately designed the HR-series of

DC receivers to be easily available, affordable and buildable by any

person willing to follow the assembly directions. To achieve this goal,

the current models, with direct coupling of the NE602 to the LM386

operating with a gain figure of 50, use an amazing minimum of parts.

If you know what you are doing with DC receiver design, we

encourage you to use our HR-series for reliable building blocks for

achieving maximum performance for your own application. If a good

idea does not work as expected, you can easily restore your Ramsey

receiver to its original circuit configuration.

Our job has been to keep in stock for immediate delivery a good

basic design, a quality PC board with plenty of work room, useful

front panel controls, correct and adjustable inductors, workable

varactor tuning and the popular NE602. We know these receivers

WORK, as specified, and that the ONLY reason any HR-receiver will

not work after the 1-2 hours needed for assembly is if we packed the

wrong parts or you put them in wrong. Once you are sure the

receiver performs as specified, there is a lot you can do to coax

maximum performance from the basic circuit.

For instance, if you choose a DC power source other than the 9-volt

battery, the space allowed for the battery offers plenty of room for a

top mounted perfboard or PC-board for preamp stages and or any

sort of passive or active audio filter that suits your needs. Keep your

work neat with short leads so as not to introduce broadcast station

overload.

ALTERNATE POWER SOURCES:

Most of the HR-80 circuitry can be operated from 6 to 14 volts

without damage or significant modification. However, it is quite

important that you carefully hook up with the correct polarity; reverse

polarity or excessive voltages WILL damage your kit.

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Ramsey Electronics QRP-80 Manual de instrucciones Pagina 19