Notices

VHF poor distance

Old 10-04-2011, 03:32 PM
  #1  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Apr 2009
Location: Carolina Beach NC
Posts: 634
Default VHF poor distance

I had an issue with the mike on my vhf and decided to replace the radio. I was offshore for the first time yesterday and could not get any weather channel where I could hear it clearly until I was about fifteen miles off. As I was headed in from offshore I started calling the Sea Tow automated radio check and was not able to get it to respond until I was about ten miles from shore. I didn't get a clear response I could hear until about five miles off. When I got back to my marina and tried again it was clear on transmit and receive. Seems it works fine locally but distance is an issue. Any Ideas? No I was not on low power. I was thinking possibly antenna connector wire may have been loosened up in installation and was going to try to re-solider. Antenna is only about two years old.
SEA HORSE is offline  
Old 10-04-2011, 04:21 PM
  #2  
Junior MemberCaptains Club Member
 
Join Date: Dec 2005
Location:
Posts: 29
Default

Buy a Digital 529-V antenna you won't be sorry
BlackFly is offline  
Old 10-04-2011, 04:38 PM
  #3  
Senior MemberCaptains Club MemberPLEDGER
 
Join Date: Nov 2005
Location: Central Jersey
Posts: 7,961
Default

Yep. Antenna connector. Check it with a VHF SWR meter
t3rockhall is offline  
Old 10-04-2011, 07:22 PM
  #4  
Admirals Club Admiral's Club Member
 
Join Date: Jan 2010
Location: Richmond, VA
Posts: 3,619
Default

Check your ground?
KismetLRC is offline  
Old 10-04-2011, 10:18 PM
  #5  
Senior MemberCaptains Club Member
 
Join Date: Feb 2003
Location: M.Vineyard, MA
Posts: 13,965
Default

Just a hint for marginal reception areas- especially when underway, antennas tend to more vertically plumb relative to any potential distant station if the boat is beam-to the intended station bearing. Less chance of transmission loss to clouds ahead or water aft, though reception should be pretty similar in most all clear directions. (Similar deal for both transmit//receive with many radar setups whose mount angles were not optimized.)
How high is the middle of your antenna?

After confirming I was using USA channel-set I'd agree with checking VSWR. And if reading high, as you are thinking 1st thing I'd try is checking / replacing the PL-259 if that is what yours uses.
TTaxi is online now  
Old 10-04-2011, 11:04 PM
  #6  
CME
Admirals Club Admiral's Club Member
 
Join Date: Mar 2010
Posts: 3,840
Default

Make sure you haven't accidentally put your radio into a "Local" mode. Make sure the letters "Loc" aren't present on your screen. The use of which significantly degrades your VHF's receiver and it does fit your symptoms too.

Always look for the simple answers first.......
CME is offline  
Old 10-05-2011, 04:22 AM
  #7  
Admirals ClubCaptains Club Member Admiral's Club Member
 
Join Date: Aug 2006
Location: Long Island / Nashville
Posts: 474
Default

Check the SWR if possible as was said. When doing so wiggle cable while transmitting and monitoring SWR meter. Keep in mind while we enter a new solar phase there’s a higher probability of worldwide disturbances. In very extreme cases of course. When there’s a major flare during these disturbances the MUF (Max Usable Frequency) becomes very low like below 10mhz. The marine VHF and WX spectrum below is much more susceptible to outages.


WX1


--


162.550


WX2


--


162.400


WX3


--


162.475


WX4


--


162.425


WX5


--


162.450


WX6


--


162.500


WX7


--


162.525


What kind of boat? Antenna? And Height?

Want to understand more about this SFI stuff have a look at below link…
http://www.solarham.com/

Regards,
Mike N2TX
shootie is offline  
Old 10-05-2011, 06:24 AM
  #8  
Senior Member
 
Join Date: Aug 2010
Posts: 836
Default

Digital Antenna, there's a joke.
the_gooch is offline  
Old 10-05-2011, 09:01 AM
  #9  
Senior MemberCaptains Club Member
 
Join Date: Jul 2006
Location: S.E. Michigan
Posts: 1,074
Default

Originally Posted by the_gooch View Post
Digital Antenna, there's a joke.


Digital is the BRAND (maker)
InTheNet is offline  
Old 10-05-2011, 09:26 AM
  #10  
Senior Member
 
Join Date: Dec 2006
Location: Barbados
Posts: 813
Default

as CME suggested...but your VHF may call it "high or low" rather than local.

I second Digital. More expensive than some of the others, but I love not having to second guess my soldering. I have over 2 years on my Digital now, but the other cheaper Shaekespeare ones didn't last that long.
gcmarshall is offline  
Old 10-05-2011, 09:27 AM
  #11  
Senior Member
 
Join Date: Feb 2009
Posts: 556
Default

Originally Posted by shootie View Post
Keep in mind while we enter a new solar phase there’s a higher probability of worldwide disturbances.
Solar distrubances have virtually no affect on marine VHF line of sight communications. It can have a big affect on HF 2-30Mhz skywave communications. Solar disturbances can actually cause long distance "openings" on marine VHF due to sporadic E propagation.

Eric
fairbank56 is offline  
Old 10-05-2011, 09:30 AM
  #12  
Senior Member
 
Join Date: Feb 2009
Posts: 556
Default

Originally Posted by gcmarshall View Post
as CME suggested...but your VHF may call it "high or low" rather than local.
High and Low refer to output power levels (<1w and 25w). LOC and DX refer to Local and Distant settings. DX is the normal setting, local switches in an attenuator to reduce receiver sensitivity. Not all radio's have this feature. Check the manual.

Eric
fairbank56 is offline  
Old 10-05-2011, 09:53 AM
  #13  
Senior Member
 
Join Date: Aug 2010
Posts: 836
Default

Originally Posted by InTheNet View Post
Digital is the BRAND (maker)
touche
the_gooch is offline  
Old 10-05-2011, 10:21 AM
  #14  
Senior Member
 
Join Date: Jul 2010
Location: To far from Holden Beach
Posts: 472
Default

Originally Posted by fairbank56 View Post
Solar distrubances have virtually no affect on marine VHF line of sight communications. It can have a big affect on HF 2-30Mhz skywave communications. Solar disturbances can actually cause long distance "openings" on marine VHF due to sporadic E propagation.

Eric
Don't forget how tropospheric ducting effects vhf and uhf. We love that long range signal bending instead of shooting straight into space.

If you had good reception and transmit range before, you more than likely have a shorted connector. I've never seen a time that I could not get a good WX signal on one of the channels. If they are not strong something related to the antenna has got to be wrong.

Charlie
Sea Ya Charlie is offline  
Old 10-06-2011, 04:49 AM
  #15  
Admirals ClubCaptains Club Member Admiral's Club Member
 
Join Date: Aug 2006
Location: Long Island / Nashville
Posts: 474
Default

Not tryin start a pissin contest? no effect? Just how long you been playin radio?

Yes ducting is very neat anomaly to say the least AS I over the years have seen this spectrum go a 1000 miles.

A good way to reduce connector failure is to install the connector correctly. After you strip the dielectric (black or white cover) tin the entire shield. Use a small pipe cutter to cut down to the center conductor, insert coax into connector and via holes on side of connector solder shield to connector creating a solid connection. Solder the tip and check VSWR.

73
Mike
shootie is offline  
Old 10-06-2011, 06:47 AM
  #16  
Senior Member
 
Join Date: Feb 2009
Posts: 556
Default

36 years as a professional marine electronics communications and service tech. I didn't say "no affect". You are confusing HF and VHF propagation. I don't wish to get into a "contest". Suggest you do your own research to educate yourself on the subject. Suffice it to say, the solar cycle and it's disturbances have virtually no affect on marine VHF-FM line of sight terrestial communications other than sporadic E propagation. I don't think this in any way relates to the OP's question.

Eric
fairbank56 is offline  
Old 10-06-2011, 07:01 AM
  #17  
CME
Admirals Club Admiral's Club Member
 
Join Date: Mar 2010
Posts: 3,840
Default

Jeeze people, take your pissing contest and start your own thread.

Lets help this guy.
CME is offline  
Old 10-06-2011, 07:03 AM
  #18  
Senior Member
 
Join Date: Mar 2009
Location: JACKSONVILLE, FL
Posts: 319
Default

Antenna
JEFF6920 is offline  
Old 10-06-2011, 07:26 AM
  #19  
Admirals Club Admiral's Club Member
 
Join Date: Aug 2011
Posts: 442
Default

Oh man!! just give the guy some decent advise on how to fix his issue like a good step by step on connector installation, and put your macho away..

http://www.seed-solutions.com/gregor...SolderCoax.htm.
westiemax is offline  
Old 10-06-2011, 07:30 AM
  #20  
Admirals ClubCaptains Club Member Admiral's Club Member
 
Join Date: Aug 2006
Location: Long Island / Nashville
Posts: 474
Default

Ok I will leave it alone...Good Luck with resolving your probelm with the original question...

ur 5/9 Dit Dit....
shootie is offline  

Thread Tools
Search this Thread