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Re: Re: [aprssig] What a diffeence an antenna makes

joe at dellabarba.com joe at dellabarba.com
Tue Nov 1 19:06:01 UTC 2005


I like to keep the marine VHF going. I would hate to fall overboard and
have my wife hit the big red distress button and nothing happen :(
I am likely going to add a 3rd antenna for an AIS system soon (AIS is
the marine version of APRS).
The new antenna also eliminates the autopilot turning 30 degrees every
time the APRS radio transmits.
BTW - we met up in Saint Michaels when I saw you on Findu after getting
a wifi signal.
73 de Joe
SV Coquina
www.dellabarba.com


Robert Kirk <isobar at bcpl.net> wrote on 11/01/2005, 06:55:56 AM:
> Joe... My solution is to use the same 156MHZ antenna as you, but installed 
> on the masthead, coming down to a coax A-B switch. It can feed the boat's 
> marine VHF or a Kenwood D7 HT for APRS & voice. That gives the little 5 
> watt Kenwood tremendous range from the 40' masthead. I could APRS all the 
> way down the Bay last year and hit the Annapolis 105 voice repeater from 
> Crisfield. That way you don't need the extra, ugly 8' pole on the transom.
> 
> Yes, but you say you can't talk on the marine VHF when  the A-B is in the 
> Kenwood position. That's actually the reason I got a ham license, to avoid 
> all that waterborne CB chatter (except for calling the bridge tender on 
> Channel 13).  If you do need the marine channels, you can listen to them on 
> the Kenwood and flip the A-B switch if you ever  need to transmit.
> 
> Bob Kirk
> N3OZB
> & Isobar - Alberg 30 #181
> 
> 
> At 10:03 AM 10/31/05 -0500, Joe Della Barba wrote:
> >On my boat I had an old decrepit mag mount 2 meter whip bungee-corded to 
> >the stern rail for APRS. Even with 30 watts it had problems getting out 
> >from many areas. I recently replaced it with a marine VHF base loaded 
> >half-wave (tuned for 156 MHz) on an 8 foot extension. The new antenna and 
> >the gain of 8 feet in antenna height has done wonders. My trip to Saint 
> >Michael's and back tracked perfectly.
> >73 de N3HGB-5
> >Joe
> 
> 
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