Reply
 
Thread Tools Display Modes
 
Old 02-15-2014, 01:41 AM   #1
Veteran Member
 
alberto's Avatar
 
City: Valencia
Country: Spain
Vessel Name: Song of Summer
Vessel Model: GB 42 Classic
Join Date: Nov 2012
Posts: 85
Gonios

Hi,
Do any of you use a goniometer for detecting the position of a VHF call?
apparently they are coming out of use.
thanks
__________________
Advertisement

alberto is offline   Reply With Quote
Old 02-15-2014, 04:11 PM   #2
Guru
 
Steve's Avatar
 
City: Thibodaux, Louisiana
Country: USA
Vessel Name: Gumbo
Vessel Model: 2003 Monk 36
Join Date: Oct 2007
Posts: 3,607
Until today I had never heard that word, I imagine they are some sort of RDF(radio direction finder) used mostly before loran and GPS. I guess the Coast Guard may use something similar to locate distress calls from non DSC radios.
__________________

__________________
Steve W.
http://mvgumbo.blogspot.com/
Steve is offline   Reply With Quote
Old 02-16-2014, 03:43 AM   #3
Veteran Member
 
alberto's Avatar
 
City: Valencia
Country: Spain
Vessel Name: Song of Summer
Vessel Model: GB 42 Classic
Join Date: Nov 2012
Posts: 85
Yes, that is. RDF
alberto is offline   Reply With Quote
Old 02-16-2014, 08:12 AM   #4
Scraping Paint
 
City: Fort Lauderdale
Vessel Model: CHB 48 Zodiac YL 4.2
Join Date: Oct 2007
Posts: 3,804
Are you interested in how VHF DF works or just if anyone is using it on their boat?

A good treatise on how different systems work is available here:

http://digitalcommons.calpoly.edu/cg...context=theses

I had one of this type antenna on my tug, it allowed me to find a "null" or no signal point but did not discriminate which of the 180 degree points it came from, that took a little maneuvering to work out.
Attached Images
 
RickB is offline   Reply With Quote
Old 02-16-2014, 09:20 AM   #5
Guru
 
City: North Charleston, SC
Country: USA
Join Date: Sep 2010
Posts: 4,390
I used to use a portable transistor radio as a direction finder to orient TV antennas on roofs of buildings. It shows a null in two directions so you have to have a general idea which direction the signal is coming from to start with.

I have no idea why a private boater would care what direction a VHF signal came from. Also, VHF transmissions are normally too short to use a simple direction finder antenna.
rwidman is offline   Reply With Quote
Old 02-16-2014, 10:38 AM   #6
Guru
 
psneeld's Avatar
 
City: Avalon, NJ
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 15,892
Some of our assistance towboats have VHF ADF...they work pretty well even with short transmissions...especially when you get close and check to see if you passed them yet..just a couple words or a keyed mike for a few seconds will give a usable indication.

I can remember when the offshore billfishermen were all hot on the Standard Horizon ADFs and installing them to see if they could home in on each other's "hot bite".

Here's the company who make the ones we use now...

Direction Finder?Products?TAIYO MUSEN CO., LTD.
psneeld is online now   Reply With Quote
Old 02-16-2014, 06:14 PM   #7
Veteran Member
 
alberto's Avatar
 
City: Valencia
Country: Spain
Vessel Name: Song of Summer
Vessel Model: GB 42 Classic
Join Date: Nov 2012
Posts: 85
It is just curiosity.
Sometimes for knowing when fishing, and also when silly conversations are blocking the number 9 channel in Europe...
It is important to identify these cases
Thanks
alberto is offline   Reply With Quote
Old 02-17-2014, 12:13 AM   #8
Member
 
City: Anacortes Washington
Country: U.S.A.
Vessel Name: Jupiter
Vessel Model: 42-ft. Camano Offshore
Join Date: Feb 2011
Posts: 10
Polaris VHF was a rdf and was made in the 60's and 70's around $1200 worked well.
The one I had on my old willard worked good,probably still does. nice to who how is answering and safety.
Don Souza
Don Souza is offline   Reply With Quote
Old 02-17-2014, 03:02 AM   #9
THD
Guru
 
City: Seattle
Country: US
Join Date: Apr 2012
Posts: 1,142
In the very old days, when Loran A was just coming in, we used an RDF on our charter fishing boat out of Wrightsville Bch, NC. Used it to return to fishing spots offshore and to find other boats that were on a hot spot. We would tune in a known station, vector it on the chart, find another and, voila, we were at the intersection! I didn't know they were even still around. It worked right beside our chart recorder with the graph paper on a roll and the squiggly needle!
__________________

THD is offline   Reply With Quote
Reply

Thread Tools
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 08:30 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012