David
DL1DN has send me a link for his
very interesting video.
David made a video in which he reduces his
SSB signal from
2.5 W to
19 mW,
during a QSO
He reduces his power using an attenuator of 3 dB and 3 attenuators of 6 dB.
An attenuator of
3 dB reduces the power to
1/2.
An attenuator of
6 dB reduces the power to
1/4.
David starts with
2.5 watt (0 dB) and uses a homebrew multiband dipole at
1.9 m above the ground.
The next steps are:
Time Attenuation Pwr Signal
0:15 0 dB 2.5 W
1:30 -3 dB 1.25 W S6
1:42 -9 dB 300 mW S5
2:00
-15 dB 80 mW Video says: -18 dB, but it is
-15 dB.
2:14 -21 dB 19 mW S4 or S3
Please notice that every step of
6 dB is
1 S-point.
The receiving OM has an
calibrated S-meter, which is excellent for this experiment.
The video shows what happens when the power is reduced.
David transmits but also
receives through the attenuator.
Every time that David reduces the power, also the signal of the received station is reduced, so you can
hear for yourself what each
step of 6 dB does.
As you can hear, listening though the attenuator is absolutely NO problem.
Click here:
https://www.youtube.com/watch?v=rvpxyoacrec
Enjoy this very interesting video
For
non German speakers:
Wahnsin = madnes
Hintergrundpegel = back ground level
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