AM FM Hidden In-Cabin Antenna - SailNet Community
Reply
 
LinkBack Thread Tools
post #1 of 14 Old 10-10-2011 Thread Starter
1977 CS27 ~ Ravat
 
cghubbell's Avatar
 
Join Date: May 2009
Location: Ontario, NY (PYC)
Posts: 161
Thanks: 5
Thanked 0 Times in 0 Posts
Rep Power: 7
 
AM FM Hidden In-Cabin Antenna

I just installed a sweet little Fusion MS-RA200 stereo head in my CS27's main cabin. I installed one of those cheap pieces of wire that has an antenna bayonet on one end. I would consider the reception to be "OK", but not great. AM seems worse than FM. It also seems very sensitive to orientation and placement, neither of which is easy to control behind the panel.

I have a few requirements for the antenna, which I recognize may not be optimal for anyone else, but here they are:
- I don't want anything mounted (suction cup/sticky) on the cabin ports.
- I don't want to pierce the deck or bulkhead for this.
- I'm not interested in a VHF splitter.
- No additional mast antenna - this has to happen in the cabin.
- Must be possible to hide behind panels.

Seems to me it should be possible to get good reception under these conditions because I've had portable radios in the boat with telescoping antennas which worked fine. I'm ok with making something, or buying something.

Are there any recommendations on antenna orientation (does horizontal/vertical matter for AM/FM?), length, cabling from stereo to antenna, etc? There has to be a HAM expert out there who knows how to make a good antenna work in the cabin...

Thanks in advance,
Chris

CS27 #1254 ~ Ravat
PYC, Lake Ontario

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
cghubbell is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 14 Old 10-10-2011
Reward for lost Kraken!
 
hellosailor's Avatar
 
Join Date: Apr 2006
Posts: 11,491
Thanks: 5
Thanked 132 Times in 129 Posts
Rep Power: 11
   
Chris, for AM you want a plain vertical mast/whip. For FM...one of those "T"s made up from some twin lead, often packaged or sold with home stereos. But as a compromise for both you'd use a vertical whip because anything horizontal will be directional.

Go to a junkyard, for five bucks get an old fashioned car whip antenna complete with cable and plug it in. Find a way to keep it vertical. Compromise on whatever you need to, ti won't get any better unless you buy one of the new amplified (needs power) shorter whips or something fancy.

Maybe you forget, radios with whip antennas, portable shortwaves, tv sets, you always have to fiddle around with pointing the antenna whip. Cars with plain vertical whips? Best compromise.
hellosailor is offline  
Quote Quick Reply Share with Facebook
post #3 of 14 Old 10-10-2011
Member
 
Join Date: Jan 2011
Posts: 83
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 5
 
I've not actually tried this, but intend to at some point. http://www.wryr.org/Antenna_instructions.pdf

Islander 30 MKII "Sojourn"


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
shogan50 is offline  
Quote Quick Reply Share with Facebook
post #4 of 14 Old 10-10-2011
Senior Member
 
Join Date: Feb 2011
Location: San Francisco Bay area
Posts: 2,616
Thanks: 5
Thanked 62 Times in 62 Posts
Rep Power: 5
 
How long is the piece of wire? Consider making it longer. You could run it all the way forward as far as I can see.

Bristol 31.1, San Francisco Bay
MarkSF is offline  
Quote Quick Reply Share with Facebook
post #5 of 14 Old 10-10-2011
Member
 
Oaksail's Avatar
 
Join Date: Jan 2011
Location: Oakville, Ontario
Posts: 54
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 5
 
I have the very same stereo head in my CS30, the antenna is just a plain wire led to the nearest stanchion base thru bolt and nut. I'm surprised at how good the reception is just by using a stanchion.
Oaksail is offline  
Quote Quick Reply Share with Facebook
post #6 of 14 Old 10-10-2011
Just another Moderator
 
Faster's Avatar
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 16,534
Thanks: 104
Thanked 312 Times in 300 Posts
Rep Power: 10
     
Mine is a piece of coax antenna extension wire, about 6 feet long and the stripped core attached to a shroud chainplate fitting inside a cabinet. Works great.

Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
Faster is offline  
Quote Quick Reply Share with Facebook
post #7 of 14 Old 10-11-2011 Thread Starter
1977 CS27 ~ Ravat
 
cghubbell's Avatar
 
Join Date: May 2009
Location: Ontario, NY (PYC)
Posts: 161
Thanks: 5
Thanked 0 Times in 0 Posts
Rep Power: 7
 
Quote:
Originally Posted by Oaksail View Post
I have the very same stereo head in my CS30, the antenna is just a plain wire led to the nearest stanchion base thru bolt and nut. I'm surprised at how good the reception is just by using a stanchion.
Now that's a creative idea! I think to maximize reception the goal is be at 1/2 or 1/4 wavelength as measured from the center of the FM band. That works out to about 31-33 inches from what I've been able to read. I wonder if you're close to that between the wire and stanchion.

CS27 #1254 ~ Ravat
PYC, Lake Ontario

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
cghubbell is offline  
Quote Quick Reply Share with Facebook
post #8 of 14 Old 10-11-2011 Thread Starter
1977 CS27 ~ Ravat
 
cghubbell's Avatar
 
Join Date: May 2009
Location: Ontario, NY (PYC)
Posts: 161
Thanks: 5
Thanked 0 Times in 0 Posts
Rep Power: 7
 
Quote:
Originally Posted by hellosailor View Post
Go to a junkyard, for five bucks get an old fashioned car whip antenna complete with cable and plug it in. Find a way to keep it vertical. Compromise on whatever you need to, ti won't get any better unless you buy one of the new amplified (needs power) shorter whips or something fancy.
That's what I was sort of gravitating towards. I figured I could pick one up cheap and mount it along the bulkhead in the wet locker which is right next to the cabinet I've mounted the stereo in.

What I'm wondering is, will the thicker & stiffer wire of the car antenna receive signals any better than the flexible wire I currently have? If not, then I may be better off just extending my wire and doing a better job of mounting it so that it's extended and not curved anywhere.

CS27 #1254 ~ Ravat
PYC, Lake Ontario

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
cghubbell is offline  
Quote Quick Reply Share with Facebook
post #9 of 14 Old 10-11-2011
Senior Member
 
Join Date: Sep 2006
Location: Texas
Posts: 526
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
 
This is a sailboat right? You've got to have a metal guy wire somewhere? The higher the better. get a piece of coax. You will get the best reception with height, and an even multiple of 1/4 wave. The spacing between the wires in a coax or twin pair lead is the impedance. In an antenna you are converting from infinite impedance to usually either 75 or 50 ohms. that is what the antenna is for. The easiest way to do this, (barring the desire to to a lot of calculations), is to connect the shield to ground, and slowely move the inner conductor along the spreader, or whatever you are using until you get the best signal, permanently connect it to this point, job done.

The Sun has Risen on a New Day filled with the Promise of Adventure.
CapnBilll is offline  
Quote Quick Reply Share with Facebook
post #10 of 14 Old 10-11-2011 Thread Starter
1977 CS27 ~ Ravat
 
cghubbell's Avatar
 
Join Date: May 2009
Location: Ontario, NY (PYC)
Posts: 161
Thanks: 5
Thanked 0 Times in 0 Posts
Rep Power: 7
 
Quote:
Originally Posted by CapnBilll View Post
This is a sailboat right? You've got to have a metal guy wire somewhere? The higher the better. get a piece of coax. You will get the best reception with height, and an even multiple of 1/4 wave. The spacing between the wires in a coax or twin pair lead is the impedance. In an antenna you are converting from infinite impedance to usually either 75 or 50 ohms. that is what the antenna is for. The easiest way to do this, (barring the desire to to a lot of calculations), is to connect the shield to ground, and slowely move the inner conductor along the spreader, or whatever you are using until you get the best signal, permanently connect it to this point, job done.
Certainly is a sailboat, and it certainly has wire rope standing rigging. Maybe one of the shrouds is close to a 1/4 wave multiple? The catch is, I have a deck-stepped mast and I really, really, really do not want to create another deck piercing for an AM/FM antenna.

I can get good reception below decks with a cheaper portable radio using its built-in telescoping antenna, so I know that I don't need to go all the way to the spreaders to meet my needs (although it may well do a much better job up there!).

The goal here is to figure out the best options for hiding antenna somewhere within the cabin and improve upon the reception my cheapo wire is capable of.

CS27 #1254 ~ Ravat
PYC, Lake Ontario

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
cghubbell is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Micro Budget Cruising - Hidden Costs Looper Cruising & Liveaboard Forum 7 10-29-2012 07:37 PM
Hidden costs in buying / owning a boat 0verdrive Boat Review and Purchase Forum 21 09-19-2008 09:15 PM
Hidden treasure in Roscoe Bay erps General Discussion (sailing related) 4 09-05-2008 11:17 AM
fastening to cabin fiberglass cabin interior marcusn Gear & Maintenance 3 09-06-2007 07:04 PM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome