Hey radio heads and sparkys.....have a VHF coax question

[Scott Danforth]

replacing the new antenna on the boat because I forgot it was up and in a bridge vs fiberglass antenna situation....... guess what losst

anyway, new antenna showed up.

I can either spend 3 hours cutting out 3M 4200 to pull new wire, or I can add a connector at the folding wake-tower hinge.

If I put a connector there, how much signal loss will I see?

 

[alldodge]

Rule of thumb is -0.5 db loss per connector

 

[sam am I]

TMI.............and in terms of power

10*log (Po/Pi) = db

Assuming -0.5 db loss per connector (think its actually less, something like -0.1 db, almost neglectable, connector quality dependent I'm sure)

At any rate..........

10* log (x) = -0.5 db

solve for x

log (x) = -0.5/10

x = 10^(-0.5/10)

x = 0.891

The ratio of Po (power out) over Pi (power in) = 0.891

Meaning?

If Po/Pi = 0.8912

And if we assume Pi = 15 watts for an example

then Po/15 = 0.8912

or Po = 15*0.8912

Po = 13.37 watts

If you're sending in 15 watts, you're going to lose 1.631 watts (-0.5 db) at the connection and have 13.37 watts left to transmit.(assumes no cable loss).

Just a guess though.......

 

[Scott Danforth]

Makes more sense to dig out the 4200 and run the whole thing..... Thanks guys

 

[sam am I]

Sure, no prob