72. Install the battery clamp. Position battery and holder so as not to cover nearby PC board mounting holes. Use the method for securing the clamp that is most convenient for you, such as:
•wire looped through clamp and PC board holes, soldered.
•small screws
•
•
73. If you desire increased audio output, C27, 10 µF, may be installed. Be sure the (+) and
74. We’re at the end now, just one part left to install. Install D2, the red LED signal indicator. The short lead is the cathode; it goes toward potentiometer R21. Leave it standing about 1/2 an inch off of the board when soldering. After soldering bend it over to a 90º angle at its midpoint so that it faces the outside of the board.
Your shortwave broadcast receiver is now finished, except for the capacitors that will determine the frequency range you will receive.
SHORTWAVE ANTENNA IDEAS
The type of antenna you'll want to use for your SR2 depends on the degree of interest you have in shortwave listening, whether you are limited to an indoor or balcony antenna, and whether you think you may soon want to obtain a HAM radio license. If the latter is true, you may want to consult HAM radio literature and build the dipole or vertical antenna which you also plan to use for HAM listening and transmitting. A
The rest of these notes on antennas are for the benefit of SR2 builders who simply wish to enjoy some shortwave broadcast listening. The SR2 is very sensitive, so its antenna requirements are minimal for casual evening listening when international broadcast signals are quite strong. 10 to 20 feet of insulated hookup wire can be neatly strung behind furniture and curtains for an adequate indoor antenna. The same length of wire, or more, outdoors or up in the attic, will be an even better receiving antenna.
1.The ideal antenna setup for this frequency range is considered to be an outdoor wire 25 to 50 feet in length, with the ground side of the antenna jack connected to a copper cold water pipe.
2.For convenience, a short length of audio cable with
3.A "banana plug" may also be plugged into the antenna jack but will not