Reply
 
Thread Tools Search this Thread
 
Old 13 June 2016, 14:43   #1
Member
 
Country: UK - England
Town: Fareham
Boat name: Wave Glider
Make: Cobra 7.55
Length: 7m +
Engine: Suzuki 250
Join Date: Sep 2004
Posts: 118
VHF Aerial and FM Reception

Hi,

Forgive this probably very obvious question to those in the know. I have noticed on my new rib the VHF Aerial goes through a splitter to both the VHF and the Radio (Music)

Is this right that the VHF Aerial can also double up as a FM antenna? I ask the question as I cannot find any radio stations with signal.... I also did a radio check yesterday and Solent Coastguard said I was readable but weak... but then I was at the top of the Hamble river and almost under the M27!

Thanks... :-)
__________________

__________________
adams1x is offline   Reply With Quote
Old 13 June 2016, 14:56   #2
Member
 
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 4,962
Yes, the VHF antenna can be used for FM reception with a suitable splitter but there will be a loss of gain to the VHF radio. The insertion loss is usually stated along with the splitter instructions. As a guide -3dB = half power.
__________________

__________________
JW.
jwalker is offline   Reply With Quote
Old 13 June 2016, 15:18   #3
Member
 
Country: UK - England
Town: Fareham
Boat name: Wave Glider
Make: Cobra 7.55
Length: 7m +
Engine: Suzuki 250
Join Date: Sep 2004
Posts: 118
many thanks.. wonder why there are no stations then... might get a cheapy FM aerial and plug it in to test :-)
__________________
adams1x is offline   Reply With Quote
Old 13 June 2016, 17:30   #4
Member
 
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 4,962
Quote:
Originally Posted by adams1x View Post
many thanks.. wonder why there are no stations then... might get a cheapy FM aerial and plug it in to test :-)
Why not get a rubber duck type fm antenna and use it permanently, remove the splitter and then get the full performance from the vhf antenna?
__________________
JW.
jwalker is offline   Reply With Quote
Old 13 June 2016, 17:33   #5
RIBnet admin team
 
willk's Avatar
 
Country: Ireland
Make: Redbay Boats
Length: 9m +
Engine: 370hp
Join Date: Feb 2008
Posts: 12,924
RIBase
Quote:
Originally Posted by jwalker View Post
Why not get a rubber duck type fm antenna and use it permanently, remove the splitter and then get the full performance from the vhf antenna?
Aye - Vtronix make a wee FM antenna in the style of the dreaded RIBfader - mine seems to work well enough offshore.
Attached Thumbnails
Click image for larger version

Name:	Return from Monachs.jpg
Views:	73
Size:	65.8 KB
ID:	113792  
__________________
"Who knows what evil lurks in the hearts of men?"
.
willk is offline   Reply With Quote
Old 13 June 2016, 17:46   #6
Member
 
Country: UK - England
Town: Fareham
Boat name: Wave Glider
Make: Cobra 7.55
Length: 7m +
Engine: Suzuki 250
Join Date: Sep 2004
Posts: 118
Good plan... on the hunt now :-)

Thanks for the advice as always! Now who is the man person to speak to about the Suzuki V6's! Need to post another thread!
__________________
adams1x is offline   Reply With Quote
Old 14 June 2016, 03:13   #7
Member
 
boristhebold's Avatar
 
Country: UK - England
Length: 7m +
Join Date: Aug 2009
Posts: 1,292
I have a cobra 7.5 with a shakespeare 1.2M VHF Aerial which goes into a RayMarine AIS100 splitter, the splitter has connections for the FM Signal, VHF Signal and AIS Signal, and all work very well. Having used various types of the normal vitronix, rib raider style aerials in the past I find I get much better VHF with the shaekespeare 1.2M. Its mounted on a foldable SS base for going under bridges or general dry stack issues.

If your having issues it could be a combination of splitter type, aerial type or even just bad connections, its always worth going for quality connections, cable and aerial.
__________________
boristhebold is offline   Reply With Quote
Old 14 June 2016, 04:12   #8
Member
 
Country: UK - England
Town: Fareham
Boat name: Wave Glider
Make: Cobra 7.55
Length: 7m +
Engine: Suzuki 250
Join Date: Sep 2004
Posts: 118
Thanks for the advice, great choice of boat BTW :-)
__________________

__________________
adams1x is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 06:44.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.