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Fourteen: VLF Radio Receiver
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plastic standoffs The 60 Hz trap filter switch, the high-pass filter and low-pass filter switches, along with the power on-off switch, were mounted on the front panel of the chassis box The headphone power amplifier power switch, the headphone jack and volume control at R13 were also mounted on the front panel of the chassis box The SO-238 antenna jack, the 1/8 record jack and the ground binding post were all mounted on the rear panel of the chassis box A 9 volt battery holder was used to secure the battery to the left rear corner of the chassis box Once the circuit has been mounted in the selected chassis, you can move on to applying power and testing the VLF receiver Connect a fresh 9 volt battery to the VLF receiver, connect a pair of headphones and a whip antenna to the antenna terminals Turn the power switch to the ON position and you should hear a hissing sound from the headphones If the receiver is totally quiet and you hear nothing, you have a problem! First, you will need to disconnect the battery, the headphones and the antenna, and you will need to carefully examine the circuit board The most common cause for circuit failure is improper installation of electrolytic capacitors and diodes Remember that these components have polarity and it must be observed for the circuit to work correctly Look over the circuit very carefully It is often advisable to have a second pair of eyes Have a knowledgeable electronics friend help you examine the circuit board for mistakes Another cause for possible errors are the incorrect placement of resistors Often colors are mistaken and resistors are installed in the wrong location Another possible problem can be the installation of the semiconductors, namely in this circuit the transistors or FETs Check the manufacturer s pin-out diagrams for the particular device and carefully re-examine the installation Hopefully at this point you have found your error and corrected it and you can then re-connect the battery, antenna and headphones and re-test the VLF receiver to make sure it is now working
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in length connected instead of the vertical antenna Wire antennas should be insulated and supported off the ground as high as you can place them The performance of a wire antenna improves the more you can get it in the clear and the more vertically it can be positioned If you do use a wire antenna, you may have to reduce the value of the input resistor R1 for best results The whistler receiver also needs a ground connection, also called a counterpoise A simple but often effective ground can be provided by your body in contact with the ground terminal (BP2) I have used an improvised finger ring attached to a wire connected to the ground terminal Other places to make a ground connection include car bodies, wire fences, or other large metal objects not connected in any way to an AC power circuit Another approach is to use short sections of copper tubing as ground stakes which can be driven into the ground and connected to your receiver Try several different grounding schemes to see which one provides the quietest reception Don t be too surprised, however, to discover that you wind up having to still make body contact with the ground terminal for quietest reception! The prototype receiver, with a whip antenna, was mounted on a piece of wood approximately 2 60 You can install the antenna at one end of the long rectangular piece of wood (it can be mounted on a bracket or just taped on) and the receiver can be mounted at the other end of the piece of wood, about one foot down from the antenna using duct tape, twosided foam tape or a mounting bracket A length of wire was run from the receiver s ground terminal down the wood and taped in place at several places Now I had a handy walking stick that was easy to carry and use! The base can be stuck into any convenient hole, jammed into a rock pile, clamped onto a fence or vehicle, or even held by hand For the best chance of hearing whistlers and related phenomena, you will have to put some distance between the whistler receiver and the AC power grid The bare minimum distance is about one quarter mile from any AC power line; the more distance you can put between the receiver and AC power lines, the better You ll need to do some exploration to discover quiet sites near you Once you arrive at a potential listening site, set up your receiver, put in a ground connection, and see what happens What you will hear depends to some extent
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