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Forum: Monohull Sailboats

05-10-2020, 08:04

Replies: 52

Coax cable for long run up mast

Views: 9,639

Posted By Ericson38

Re: Coax cable for long run up mast

Thanks for pointing out my error on low power (1 watt not 5 watts).

The confusion here arises from the fact that the ear is a 10[common]Log proportional hearing transducer. So something that...

Forum: Monohull Sailboats

05-10-2020, 07:44

Replies: 52

Coax cable for long run up mast

Views: 9,639

Posted By Ericson38

Re: Coax cable for long run up mast

Steve,

Great website. Also, what do you think of the current crop of internal or external AIS splitters ? The external ones I looked at a few years ago were really just that. As far as received...

Forum: Monohull Sailboats

02-10-2020, 21:07

Replies: 52

Coax cable for long run up mast

Views: 9,639

Posted By Ericson38

Re: Coax cable for long run up mast

Human hearing is approximately Logarithmic. For something to sound twice as loud (in your head), the sound pressure level (SPL) has to be increased by 10dB (10 times).

Forum: Monohull Sailboats

02-10-2020, 19:21

Replies: 52

Coax cable for long run up mast

Views: 9,639

Posted By Ericson38

Re: Coax cable for long run up mast

When I 1st got my towing endorsement on my 100 Ton Masters License in Long Beach Ca in 1991, I decided that working for Vessel Assist (like Sea Tow on the East Coast) would be a fun way to use it. It...

Forum: Monohull Sailboats

01-10-2020, 16:04

Replies: 52

Coax cable for long run up mast

Views: 9,639

Posted By Ericson38

Re: Coax cable for long run up mast

A cable run of 75' using RG 213 would have a loss of around 2.8dB at 150 MHz, knocking a 25 watt signal out of the radio down to 15 watts, just at the point where the masthead VHF antenna port...

Forum: Monohull Sailboats

29-09-2020, 14:10

Replies: 52

Coax cable for long run up mast

Views: 9,639

Posted By Ericson38

Re: Coax cable for long run up mast

25 watts in ideal conditions is more than good enough to close a link to a receiving radio (for decent reception) at 10 miles, which is close to the LOS range at 60 feet elevation.

Antenna gain of...

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