Cruisers Forum

Thread Tools Search this Thread Rate Thread Display Modes
Old 12-12-2013, 19:02   #46
Registered User

Join Date: Apr 2008
Location: Cheyenne, WY
Boat: 1981 Ta Tong Cape Horn Cutter
Posts: 323
Images: 2
Send a message via Skype™ to gts1544
Re: Radio directional finder

cal40john, I can't speak to the nautical technicalities, but on aircraft ADF systems (automatic direction finding), we had both the rotating (mechanical or electrical) directional antenna, which could resolve the direction of the transmitting antenna to within 180 degrees, but you couldn't tell which direction without the sense antenna, which was a simple single wire from cabin top to tail. This sense antenna, through the circuitry, resolved the ambiguity. Make sense, no pun intended? gts1544
gts1544 is offline   Reply With Quote
Old 18-12-2013, 15:35   #47
Registered User

Join Date: Dec 2013
Location: Ireland
Boat: Nissan NV200
Posts: 3
Re: Radio directional finder

It was the heady days of the early 80s, when only mil had gps towards late 80s use to be called p code, as it was v accurate then the civil models were made a fraction less accurate, but DF was the old Decca and loran systems oh how bad these things were, u they had to apply deveation and variation errors, big pool of errors, god i hated it every hour pool of errors or every watch, still have the notes somewhere, i would be surprised if most stations hadnt shut down due to Satnav,
spearfish is offline   Reply With Quote
Old 18-12-2013, 16:00   #48
roverhi's Avatar

Join Date: Aug 2005
Location: Carlsbad, CA
Boat: 1976 Sabre 28-2
Posts: 7,505
Send a message via Yahoo to roverhi
Re: Radio directional finder

The last US Loran station shut down several years ago. AFAIK Loran receivers are totally useless now. Occasionally someone tries to sell one on Ebay or Craig's List. Don't know whether they are clueless or scammer trying to nick the unwary. Knowing Craig's List, it's probably the latter
Peter O.
'Ae'a, Pearson 35
'Ms American Pie', Sabre 28 Mark II
roverhi is offline   Reply With Quote
Old 18-12-2013, 16:21   #49
Moderator Emeritus
Hudson Force's Avatar

Cruisers Forum Supporter

Join Date: Nov 2008
Location: Lived aboard & cruised for 45 years,- now on a chair in my walk-in closet.
Boat: Morgan OI 413 1973 - Aythya
Posts: 8,402
Images: 1
Re: Radio Directional Finder

I used an RDF from the 70's into the early 90's. I skipped LORAN and I remember the first GPS units were at around 4 or 5K. With the obvious knowledge of the sun rising in the east and setting in the west, I never needed to distinguish between the two nulls. If a weak station was lost to my hearing at 95 degrees and on the sweep I could hear it again at 119 degrees then the bearing was 107 degrees,- worked well. I could still use airports and radio stations until the GPS costs came down to about $200. From south Florida to the Bahamas I could always pick up West Palm Beach, Jupiter Inlet, West End and Eggmont Key.
Take care and joy, Aythya crew
Hudson Force is offline   Reply With Quote
Old 18-12-2013, 16:47   #50
Registered User

Join Date: Aug 2012
Posts: 1,065
Re: Radio Directional Finder

RDF and ADF receivers are good for detecting lightning discharges. Intensity of the discharge and relative bearing could be gotten. In 2007-2008 the radio in my truck would receive the beacon located on Adak Is. in the Aleutians. I was in central California.
Richard5 is offline   Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Newbe to ssb, anybody help me with some basic info? chrismin Marine Electronics 32 05-11-2013 15:17
Obtaining Accurate Offshore/Hi-Seas Weather data/forecasts, while at sea ka4wja Marine Electronics 57 25-10-2013 11:00
SatPhone vs SSB/SW KStepman Marine Electronics 44 27-09-2013 18:06
Furuno NX300- 200-400 miles offshore jared1048 Marine Electronics 9 11-05-2013 09:37
Ham License Dockhead Marine Electronics 138 04-03-2013 12:12

Advertise Here

All times are GMT -7. The time now is 14:25.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.