Reply
 
Thread Tools Search this Thread Display Modes
 
Old 04-10-2019, 06:40 PM   #1
Veteran Member
 
City: New Orleans
Country: USA
Vessel Name: Czech Mate
Vessel Model: President 41
Join Date: Jan 2017
Posts: 57
RG 58 A/JJ - Something making a hole in my boat

Hello all. I was hoping someone could help me identify whatever these are that appear to be making holes in the bottom of my boat. I have two of them just off the centerline and just behind my engines. They each have a cable coming from them labeled RG 58 A/JJ, which makes me think they used to be for some type of electronics that are no longer on the boat. Does anyone happen to know what they are or what they were for?
Attached Thumbnails
Click image for larger version

Name:	Photo 1.jpg
Views:	83
Size:	192.5 KB
ID:	87415   Click image for larger version

Name:	Photo 2.jpg
Views:	70
Size:	163.5 KB
ID:	87416  
__________________
Advertisement

jsplichal2 is offline   Reply With Quote
Old 04-10-2019, 06:43 PM   #2
Guru
 
Pau Hana's Avatar


 
City: Seattle, WA
Country: Good Ol' US of A!
Vessel Name: Pau Hana
Vessel Model: 1989 PT52 Overseas Yachtfisher
Join Date: Aug 2012
Posts: 1,977
Quote:
Originally Posted by jsplichal2 View Post
Hello all. I was hoping someone could help me identify whatever these are that appear to be making holes in the bottom of my boat. I have two of them just off the centerline and just behind my engines. They each have a cable coming from them labeled RG 58 A/JJ, which makes me think they used to be for some type of electronics that are no longer on the boat. Does anyone happen to know what they are or what they were for?
My guess is that they are transducers of some sort.

Where does the cable trace to?
__________________

__________________
Peter- Marine Insurance Guru & tuna fishing addict!

1989 52' PT Overseas yachtfisher
Pau Hana is online now   Reply With Quote
Old 04-10-2019, 06:57 PM   #3
Guru
 
Xsbank's Avatar
 
City: Pender Harbour, BC
Country: Canada
Vessel Name: Gwaii Haanas
Vessel Model: Vancouver Shipyards Custom Aluminum 52
Join Date: Sep 2013
Posts: 3,204
Transducers for sure.
__________________
Don't believe everything that you think.
What are we offended about today?
Xsbank is offline   Reply With Quote
Old 04-10-2019, 07:46 PM   #4
Guru
 
Comodave's Avatar
 
City: Au Gres, MI
Country: US
Vessel Name: Never Say Never
Vessel Model: President 41 DC
Join Date: Jul 2015
Posts: 5,072
Looks like depth finder transducers. How is your President 41? We have one also.
Comodave is offline   Reply With Quote
Old 04-10-2019, 08:14 PM   #5
Veteran Member
 
City: New Orleans
Country: USA
Vessel Name: Czech Mate
Vessel Model: President 41
Join Date: Jan 2017
Posts: 57
Well now I feel like an idiot. I just assumed the depth sounder was on the transom - for no particular reason. Once the cable reached the large bundle leaving the engine room I stopped looking since I assumed it was for something already removed. Love the President. And it is good for a laugh everytime someone thinks I have this huge love affair with Bush #1.
Thanks guys.
jsplichal2 is offline   Reply With Quote
Old 04-11-2019, 07:38 AM   #6
TF Site Team
 
City: Westerly, RI
Country: USA
Vessel Name: N/A
Vessel Model: 1999 Mainship 350 Trawler
Join Date: Jan 2014
Posts: 1,722
RG-58 is Coaxial cable. RG = Radio Guide. It is used for low-power signals and RF connections.

The 58 class has an outer diameter of 0.195 inches, 50 to 53.5 ohms impedance, and can handle up to 500 watts of HF (High Frequency) power.

RG58/U has a solid center conductor of 20 AWG bare copper. Its capacitance is 28.5 pF per foot.

RG58A/U has a center conductor of 20 AWG stranded tinned copper. Its capacitance is 30.8 pF per foot.

RG58C/U has a center conductor of 20 AWG stranded tinned copper. Its capacitance is 30.8 pF per foot. It's outer jacket is a different material than RG58A/U.

RG-58A/U or RG-58C/U was once widely used in "thin" Ethernet (10BASE2), for which it provides a maximum segment length of 185 meters. However, it has been almost completely replaced by twisted-pair cabling such as Cat 5, Cat 6, and similar cables in data networking applications.

RG-58 cable can be used for moderately high frequencies. Its signal attenuation depends on the frequency, e.g. from 10.8 dB per 100 m (3.3 dB per 100 feet) at 50 MHz to 70.5 dB per 100 m (21.5 dB per 100 feet) at 1 GHz.

I have no idea what R-58 A/JJ is. I'm only familiar with JJ as a designation for the BNC connectors on r58m like BNC-A-JJ (A JJ adapter).
Shrew is offline   Reply With Quote
Old 04-11-2019, 08:12 AM   #7
Veteran Member
 
City: New Orleans
Country: USA
Vessel Name: Czech Mate
Vessel Model: President 41
Join Date: Jan 2017
Posts: 57
Probably something old that they donít make anymore. Thanks.
__________________

jsplichal2 is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





All times are GMT -5. The time now is 04:34 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012