Experiments with LC circuits part 2
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The next experiment is made with basket weave coil L6.
The tuner capacitor is C1b.
Coil L6. This coil has no coilformer. |
Measurement number |
LC combination | F min kHz |
F max kHz |
Q 600 kHz |
Q 900 kHz |
Q 1200 kHz |
Q 1500 kHz |
12 | L6 C1b | 512 | 2075 | 317 | 340 | 279 | 243 |
In the next experiment the coil is divided over two coilformers.
The outside diameter of the coil is now reduced, and the receiver can be build
more compact.
The distance between the coilformers is adjustable, I made measurements with
distances of 10, 20 and 40 mm.
|
Coil L7 This coil has two coilformers of foam PVC. |
Measurement number |
LC combination | F min kHz |
F max kHz |
Q 600 khz |
Q 900 kHz |
Q 1200 kHz |
Q 1500 kHz |
13 | L7 C1b 10mm distance |
460 | 1926 | 332 | 324 | 265 | 220 |
14 | L7 C1b 20 mm distance |
511 | 2190 | 287 | 334 | 255 | 224 |
15 | L7 C1b 40mm distance |
550 | 2370 | 283 | 301 | 255 | 216 |
The next coil has less wire then the coils before.
Coil L8 The wire length on the former is 6.5 meter, and the two leads are 0.25 meter.
|
Measurement number |
LC combination | F min kHz |
F max kHz |
Q 600 kHz |
Q 900 kHz |
Q 1200 kHz |
Q 1500 kHz |
16 | L8 C1b | 816 | 3490 | * | 303 | 287 | 269 |
Because of the shorter wire length, the minimum frequency is not very low, but the Q at 1200 and 1500 kHz is higher then all coils before.