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[. . . ] LOW BANDER Low Frequency SWL Converter
Ramsey Electronics Model No. VLF1
Tune in on all that low frequency action your rig has been missing!Get down below 400KHz with an effective and easy-tobuild design.
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Converts 400KHz shortwave up to 4MHz. Less than 10dB loss from 10KHz to 600KHz! [. . . ] Finally, route it back through the second hole again.
14. Remember to be delicate and loose with your wiring. Snug the coils as much as you can without having to use anything but gentle force on the wires. Now wind the second wire through the other hole in the same way. Your transformer should now look like this:
VLF1 · 11
16. The twisted part is the center tap of the secondary and the other two ends make up the end points of the secondary. This will go much faster than the secondary winding. Install C7, . 1uF ceramic disk capacitor (marked 104) next to R5. Install C13 1uF electrolytic capacitor next R6. Be sure to observe polarity.
VLF1 · 13
31. Install Q1 the 2N3904 NPN transistor next to C13. This provides amplification for the mixed signal fed to the output jack. Be sure to align the part with the outline on the board. The flat side should face the RCA jacks at the bottom of the board. Install R9, 270 ohm resistor (red-violet-brown) next to C3. Install R8, 18 ohm resistor (brown-gray-black) next to Q1. Now take a break from this part of the board and mosey over to the left side and you can install the heart of the VLF1, the integrated circuits. Solder in U2, the MC74HC04AN Hex Inverter. Be sure to observe the direction when placing it. ICs soldered in the wrong way tend not to work. Its outline on the board has a notch at one end. Line this up with the notch on the top of the IC. [. . . ] NOT be assembled with acid core solder or flux. BE returned in fully-assembled form, not partially assembled. BE accompanied by the proper repair fee. No repair will be undertaken until we have received the MINIMUM repair fee (1/2 hour labor) of $25. 00, or authorization to charge it to your credit card account. [. . . ]
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