Ramsey Electronics FR146 Instruction Manual download pdf (Page 4)

SR-1 – 4

INTRODUCTION TO THE SR-1

The SR-1 is a single-conversion superheterodyne receiver designed specifically

for listening to AM broadcasting stations in the range of 4 to 10 Mhz. Because

of this "superhet" design, your favorite foreign broadcasting services will come

in loud and clear, with pleasing audio sound quality, with a minimum of

overload, frequency drift or heterodyne whistles. Because of this broadcast

oriented design, other shortwave signals such as Morse code (CW), single-

sideband (SSB) voice communications and some Teletype signals will usually

sound like garbled hisses. On the other hand, similarly inexpensive receivers

designed for CW and SSB can give only marginal performance in receiving

broadcast stations due to the lack of superheterodyne design. For example, our

popular Ramsey direct-conversion receivers for the 80,40,30 and 20 Meter

Amateur bands will also pick up AM broadcast stations, but you'll mainly hear

their strong AM "carrier" signal due to the lack of the superheterodyne circuitry.

Even if such a carrier is tuned to a "null," listening fidelity is less than desirable.

WHAT YOU CAN EXPECT TO HEAR

First, let's take a look at what is POSSIBLE to hear on your SR-1. The

following are the international shortwave broadcasting bands within its tuning

range:

4.750-5.060 Mhz. (Lower power, regional "tropical" broadcasting)

5.950-6.200 Mhz (Late evening)

7.100-7.300 Mhz. (Late afternoon, early evening) (This band is always shared

with the 7.0-7.3 Mhz Amateur Radio Band)

9.500-9.900 Mhz. (Always "something" on, 24 hours a day!)

Especially strong signals include these, among others:

• BBC London: an intelligent perspective on world affairs

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Ramsey Electronics FR146 Instruction Manual Page 4