יש כאן מישהו שיכול להביא נימוק פיסיקאלי שאכן לכבל אחד יש השפעה על גוון הצליל יותר מכבל אחר?
נימוק פיסיקאלי ולא נימוקי וודו ואמונות תפלות.
היחיד שחושב בצורה צלולה הוא ארנון.
מצאתי נקודה מעניינת במאמר מסויים:
"Copper is the next best conductor, with about 1.05 times the resistance of silver, and due to its lower cost is the most commonly used conductor for audio and video cables. Unfortunately copper oxidation is a semi conductor and should be avoided because of the "skin effect" which causes high frequencies to use the outside of the conductor at high frequencies. If the outside of the conductor is oxidized, high frequency performance will suffer."
עריכה:
אחרי קריאה קצרה מצאתי משהו עוד יותר מעניין שגורם לי לחשוב שבאמת יש הבדלים.
"
When sending power down a transmission line, it is usually desirable that as much power as possible will be absorbed by the load and as little as possible will be reflected back to the source. This can be ensured by making the load impedance equal to Z0, in which case the transmission line is said to be matched. Ensuring the source impedance matches Z0 will maximize power transfer from the source to the transmission line, but has no other effect on the behavior of the line.
Some of the power that is fed into a transmission line is lost because of its resistance. This effect is called ohmic or resistive loss (see ohmic heating). At high frequencies, another effect called dielectric loss becomes significant, adding to the losses caused by resistance. Dielectric loss is caused when the insulating material inside the transmission line absorbs energy from the alternating electric field and converts it to heat (see dielectric heating).
The total loss of power in a transmission line is often specified in decibels per metre (dB/m), and usually depends on the frequency of the signal. The manufacturer often supplies a chart showing the loss in dB/m at a range of frequencies. A loss of 3 dB corresponds approximately to a halving of the power.
High-frequency transmission lines can be defined as transmission lines that are designed to carry electromagnetic waves whose wavelengths are shorter than or comparable to the length of the line. Under these conditions, the approximations useful for calculations at lower frequencies are no longer accurate. This often occurs with radio, microwave and optical signals, and with the signals found in high-speed digital circuits."
קישור לכתבה: http://en.wikipedia.org/wiki/Transmission_line
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