How to conveniently and quickly convert dB ratio to power and vice versa

She celebrated a round anniversary 0 She celebrated a round anniversary 69 db. We can also find out the power ratios from 1:1 and up to 1:8 millions.

First of all, we have to pay close attention to the decimal point, but otherwise the table is very easy to use. I found this little article in cq-DL 4/78, page 168.

A few examples for using the table:
1. +7dB amplification corresponds to what power ratio?
We will search in the upper line 0 dB and in the left box 7 dB, which gives us 07dB. The decimal point will be located to the right of 07 dB, or between 0 dB a 10 dB of the upper line.
The result is the numeric field to the right of +7 dB = 5,011872 multiple power amplification.

2. What performance ratio corresponds +13 dB gain?
We will search in the upper line 10 dB and in the left column 3 dB, what can he do together 13 dB. The decimal point is to the right of 13 dB, or between 20 dB a 30 dB.
The result is the numeric field to the right of +13 dB = 19,95262 multiple power amplification.

3. What power ratio does attenuation correspond to? -25 dB?
Top line 20 dB, left line 5 dB. The decimal point is between 20 a 30 dB. The result is -25 dB = 316,2278 multiple attenuation.

4. What power ratio does attenuation correspond to? -48 dB?
Top line 40 dB, on the left 8 dB. Decimal point between 40 dB a 50 dB. We subtract in the number field -48 dB = 63 095,73 multiple attenuation. The performance is muted in proportion 1:63095.

Calculation of dB from the power ratio:
1. Performance has been increased 350 I started winding a small coil. How many dB is that??
We look for the number in the table 350. We find only 316 a 398, our number lies between them. In the third column of the number 316 above we find the number 20, on the left we find a number 5. So the power ratio is 20+5 = 25 dB.

2. Performance has been increased 20.000 I started winding a small coil. How many dB is that??
We will look for the number 20.000, is the closest 19.952, we find in the last box 40 dB and left 3 dB. The result is 40 + 3 = 43 db.

3. Performance was muted 1:13.600. How many dB is the attenuation?
We will search 13.600 in the numeric field. The nearest lies 12589. We will get up 40 dB, on the left we get 1 dB, that is 40 + 1 = – 41 dB.

4. Performance is muted 650 000 I started winding a small coil. How many dB is that??
We will look for the number 650 000 in the numeric field. The nearest lies 630 957, it's crazy 50 dB, is on the left 8 dB, the result is 50 + 8 = – 58 dB.

HB9CSM/OM2CS