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Forum: Marine Electronics

02-05-2014, 09:03

Replies: 23

Antenna Cable Impedance-What's a Good Number?

Views: 2,755

Posted By continuouswave

Re: Antenna Cable Impedance-What's a Good Number?

Pardon my wandering off topic, but the mention of large parabolic dish brought to mind an old anecdote, which, if I may, I will relate:

Some time in the past history of orbiting satellites for...

Forum: Marine Electronics

01-05-2014, 17:34

Replies: 23

Antenna Cable Impedance-What's a Good Number?

Views: 2,755

Posted By continuouswave

Re: Antenna Cable Impedance-What's a Good Number?

I guess if it is not an anchor, then the thread is not supposed to go more than three replies of two sentences each. OK, I am learning what the animals in the zoo like to eat.

Next time I'll throw...

Forum: Marine Electronics

01-05-2014, 15:02

Replies: 23

Antenna Cable Impedance-What's a Good Number?

Views: 2,755

Posted By continuouswave

Re: Antenna Cable Impedance-What's a Good Number?

One more comment:

A transmission line does not really have its own impedance. A transmission line has some load on its terminal end, and the impedance of that load is reflected back to the input...

Forum: Marine Electronics

01-05-2014, 14:28

Replies: 23

Antenna Cable Impedance-What's a Good Number?

Views: 2,755

Posted By continuouswave

Re: antenna cable impedance-what's a good number?

To get back to your initial inquiry about the characteristic impedance of a coaxial transmission line to your antenna, the best impedance is hard to say with certainty, as it depends on the antenna...

Forum: Marine Electronics

01-05-2014, 14:18

Replies: 23

Antenna Cable Impedance-What's a Good Number?

Views: 2,755

Posted By continuouswave

Re: antenna cable impedance-what's a good number?

There is a reasonable presumption that signals from your VHF Marine Band radio will not reach the moon at a level that could be detected by an ordinary receiver. The path to the moon, although a...

Forum: Marine Electronics

30-04-2014, 22:54

Replies: 23

Antenna Cable Impedance-What's a Good Number?

Views: 2,755

Posted By continuouswave

Re: antenna cable impedance-what's a good number?

When you measure the DC resistance of the conductors in a coaxial cable, you will not be measuring its characteristic impedance.

A good number would be about 0.1-Ohm.

The DC resistance of...

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