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| Gollum's tips and little tricks for crystal sets | ||
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Chapters Click on blue dots | Last
update: | Headlines,
previews |
Antennas, ground |
12/07/2006 | What kind of antenna should I use? Which type of antenna coupling is the best? Which ground is best? Frame antennas. Aluminum foil antenna. Ferrite rod antenna. Antenna coupling via 52 ohms coaxial cable. |
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Coils, circuits, wave traps |
11/15/2006 | Cylinder coils with lower internal capacity. Low loss coils. Litz wire coils better than solid wire coils? How to solder rf litz wire. Which coil former is for b.c. band high "Q" best? Basket weave coils? Spiderweb-coils? Cylinder coils? Rejector circuits (wave traps) for B.C. and SW band crystal receivers. Ferrite pot core coils. How counting circuits? Do not use bad isolation matererial. Serial or parallel resonance? LC - Ratio and crystal set. |
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Diodes, Crystals |
09/13/2007 | Which diodes to choose? Are there differences between diodes of the same type? Which diodes produce best sensitivity? Moment of truth for special super-diodes. Crystal rectifiers. A simple rectifier. Voltage doubler. |
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DX-reception |
12/10/2005 | Crystal receiver DX reception. Marginal reception at day-time? Which headphone is best for DX reception? DX Crystal Receiver with low losses. Determining of weaker stations. Tracking of long distance stations. Are cases (covers) important? Many wires, many switches. |
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Frequencies, ranges |
01/25/2003 | The tuning range of your crystal receiver. How to adjust the coil for the required frequency range? RF Signal Generator. Frequency determining without rf signal generator. |
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Miscellaneous |
02/06/2008
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. List of manufacturers. Needs you measuring instruments? Xtal sets of my guests. Hints by my guests. DRM reception using a crystal set |
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Phones, transformers |
05/14/2004 | You have no 2000 ohms headphone? Which headphone is best for DX reception? Test the sensitivity. Using two crystal earphones with a crystal receiver. Sound powered ear phones. Impedance transformers. R.F. filter capacitor connected parallel to the ear phone? Loudspeaker reception. |
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Tuning capacitors |
05/15/2004 | How connect the tuning capacitor? Solid dielectric or air dielectric tuning capacitor? Which capacity should the tuning capacitor have? Variable capacitors and high Q in tuned circuits. |