I am installing an EM-trak B100 class B transponder AIS
. I installed a Shakespeare 4200 on bimini
about 2m above the water
. Not perfect but easily doable. On receive I can see 50+ AIS
signals in our area, with the furthest boat about 30nm away, ATON up to 50nm. I am in a marina inside a deep bay with shallow land around.
I cannot see my boat on MarineTraffic, but other boats closel by. A friend on the same docks can see me on his AIS receiver.
Shakepeare 4200 with 15' of RG58 cable and PL259 connector. Originally I had extended this with 15' RG8 with PL259 ends and a joiner. Initially I thought that my extension may be bad. Today I moved the B100 temporarily to the aft cabin
and hooked it up directly to the Shakespeare pig tail. Same or worse results (number to follow further down). I redid (soledered the PL259 twice with same reults. I checked with multi meter that I have no connection between shield and core
Testing so far.
When I hook up to the mast head antenna
from the VHF
I can see my boat on MarineTraffic.
The ProAIS software
has a diagnostics page with VSWR. Here are some screen
Picture 1: SWR 0.9:1 with mast head
Size: 120.7 KB
ID: 87136" style="margin: 2px" />
Picture 2: SWR 1.9:1 with 4200 on bimini and RG extension
Picture 3: SWR 3.1:1 without extension on supplied 15' pigtail RG58, connector twice redone - same readings for SWR
Size: 109.9 KB
ID: 87137" style="margin: 2px" />
Is the antenna bad?