|Topic Review (Newest First)|
|07-02-2008 07:59 AM|
Simple test of coax:
But: DC resistance tests on antenna systems are a crude check, at best. Assuming they check out, DC-wise, you really need to put an SWR bridge on the system, as well.
Then, if/when that all checks out: You need to test it in real life with some test communications.
|07-02-2008 12:04 AM|
Sorry to hear that It will be, most likely your upmast connection to the antenna in case you have a connector up there.
But very good you flew your spi . When I singlehand it, I just point my boat offwind, engage my autopilot and adjust engine for a 1-2 knots of apparent wind (well, suposing its not blowing that hard, what I wouldn't fly it anyway). Once its done, just quit the engine and the thing grows !! Agree with you, what a blast .....
|07-01-2008 11:25 PM|
Ok== today I picked up an emergency antenna and guess what-- I can both receive and transmit. Before I made the purchace I checked the wiring from the radio to the base of the mast and it was ok. Next I checked for resistance at the base of the mast and it was open. I guess it is either the cable in the mast,the connection,or the antenna. So I guess up the mast I go.
Thanks for the help guys.
P.S. after figureing that out today I went and did my first single handed attempt at flying the spin. What a blast that was.
|07-01-2008 10:04 AM|
Originally Posted by Vasco View Post
|07-01-2008 09:30 AM|
|Vasco||This might sound strange but does your vhf have a "hail" or "loudhailer" function. I had a King vhf that had this function and once in a while I'd press that function button by mistake and, not having any loudspeaker hitched up, nothing would happen when I talked. The first time it happened I even went up the mast to check the antenna. A friend had the same unit and thought I was a genius when I fixed his "non-transmitting" vhf. Of course he'd pressed the hail button inadvertently. Anther thing to look for is an "intercom" function. That might be on.|
|07-01-2008 09:08 AM|
Next time: Suggest you test a new installation as soon as possible after completing the installation, rather than waiting until you need it or want to use it.
Second the earlier suggestion of an emergency backup antenna. You should have one, anyway, for, you know, emergencies . And they make a handy test/debug tool.
Maybe you have a friend that has an SWR bridge? (Also called an "SWR meter.") If you're really lucky, and have a Ham Radio friend that uses VHF, maybe even somebody that has both an SWR bridge and a low-power dummy load. A plain old multimeter may be able to tell you something about your coax and antenna, but you'll almost certainly have to go up the mast (I'm assuming a masthead antenna) to do that.
This looks like a decent article on the whole thing: VHF Marine Antenna Fundamentals.
|06-30-2008 11:07 PM|
|negrini||Well, could be your VHF too. There is no straight/obvious answer. You should approach the problem in parts, and I suggest going from down to top (your mast). First, check your antenna connection for some "resistive load", so in case your antenna circuit is open, you don't fry your VHF output, during the diagnose. Best would be a SWR, but a patch antenna would help you eliminate your radio guess, or bringing it to a friend's boat. Unfortunately, majority of problems in VHF resides on the top of your mast ....|
|06-30-2008 09:50 PM|
Buy a small emergency antenna (which you should have anyway) and try transmitting with it. If it works, the problem is in the antenna or cable and LIKELY a corrosion problem in the fitting at the top of the mast.
P.S. There's one recently listed for sale in classifieds for asking price of $30!
|06-30-2008 08:33 PM|
|sailingdog||It could also be a problem with the antenna cable. Check the antenna connection with a SWR meter.|
|06-30-2008 08:19 PM|
|artbyjody||Did you make sure the handset / mic is actually properly tightened in? (been there done that)...|
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