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Old 18 November 2009, 09:28   #11
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Originally Posted by GaryC View Post
I was made aware by the launch site, that when 14 miles out and on an emerg call to the coastguard (which was fine reception wise) that the launch site could only hear one side of the conversation. I am hoping the bigger whip will give us a little more range.
What channel were you working on, 16 or a Duplex* CG working channel, e.g. 23?

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Old 19 November 2009, 10:30   #12
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What channel were you working on, 16 or a Duplex* CG working channel, e.g. 23?

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Initially Ch 16 and then another channel that I cant quite remember. (it will have been one selected by the coastguard)

The main reason is probably one of ariel height. The Launch site are about 50ft above sea level. Whereas the Coastguard are on top of a cliff and then have a tower.
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Old 19 November 2009, 10:34   #13
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Originally Posted by 9D280 View Post
Which may be to your tramsmitting detriment unless your RIB is perfectly stable & aligned to the horizon....... As you roll over waves that perfect disc will tip sky / sea ward along with the aerial, meaning the signal will fire over the top & miss most recieving antennae on one side & get swallowed by the sea on the other.
It is my understanding that the vertical divergence is approx 50deg for a 6db gain antennea. So unlikely to cause problem. (to much)

It will also be mounted on top of an A Frame so should be ok re height.

Thanks

Gary
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Old 19 November 2009, 10:43   #14
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Initially Ch 16 and then another channel that I cant quite remember. (it will have been one selected by the
You will be aware that the CG often use Duplex working channels. Your Launch site would not be technically able to receive you on this channel, only the CG's replies. If they could hear you on 16 but not the other channel - this is probably the reason. They might have just missed the short initial transmission on 16 too.

Otherwise, it's your wee antenna
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