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Old 04 August 2011, 18:13   #21
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Originally Posted by GJ0KYZ View Post
That's insane advice, surely? If the guy's 15 miles out to sea, a hand-held tx is unlikely to raise the CG; only a 25w fixed set with a decent antenna will guarantee communication at that range. An EPIRB is fine as an additional safety measure but a reliable radio is more important in my book; you can't talk to the CG or other vessels and update them of your situation with a PLB.
I'm thinking i would definately prefer the radio option. Mainly so i can actually speak with humans and if i connect it up to the gps then at least it will transmit my location in an emergency. Having just checked my distances its around 13 miles out we go sometimes (knock john forts).
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Old 04 August 2011, 18:19   #22
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an Ariel mount at 1metre will contact a shorebased station at 15 nautical miles.

Fixing a VHF is an option, but my comment is if he is always in group...you have safety in numbers...

A PLB is good if the when all goes wrong, a DSC Fix VHF radio is worth it weight in gold if GPS is fitted to it - Press the Red Button.

We communicate with 5 watt, radios from ranges along the coast greater than 15 miles to Forth Coastguard.

Power Does not govern the range of a VHF signal but is the height of Ariel.

I carry a handheld, a Fixed Radio and PLB on my 5.5 metre RIB, but i have A Frame.

Regards

S.
Thanks for your comments. The areial that Channel Ribs has quoted on is 1 metre and i'm not going to be going any further than 15 miles. I will certainly connect up to the gps and i'm sure thats an option on mine.

I only have a few cm's between my up and over garage door and outboard when i close the door hence why an a frame is not installed and i'm after an aerial that folds. Providing everyone thinks the fixed set is a worthwhile investment i'll go for it. Just didnt want to spend pennies, well actually pounds if i'm not going to get much improvement but from comments so far it seems i will.
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Old 04 August 2011, 18:20   #23
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Quote:
Originally Posted by GJ0KYZ

I don't think that's quite right. A squelch circuit in an FM receiver sets a threshold that a signal needs to exceed in order to unmute the audio. The reason why weak transmissions break up when the squelch is 'on' is that they will occasionally drop below the signal threshold and so become temporarily inaudible.
thanks - I always thought it cleaned up the signal like filter so it makes the wave form cleaner...too much you make the wave form too clean hence distort....

maybe both is right! just different ways if saying it.....
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Old 04 August 2011, 18:57   #24
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Originally Posted by actions

Thanks for your comments. The areial that Channel Ribs has quoted on is 1 metre and i'm not going to be going any further than 15 miles. I will certainly connect up to the gps and i'm sure thats an option on mine.

I only have a few cm's between my up and over garage door and outboard when i close the door hence why an a frame is not installed and i'm after an aerial that folds. Providing everyone thinks the fixed set is a worthwhile investment i'll go for it. Just didnt want to spend pennies, well actually pounds if i'm not going to get much improvement but from comments so far it seems i will.
it's not the size of Ariel it is the height Ariel is mounted from the sea...what malthouse suggests is fine... the higher you mount the actual Ariel the better...


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Old 05 August 2011, 02:07   #25
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Crikey that was a lively thread over night!

Having a PLB and no fixed VHF seems a bit odd to me, upon recording a beacon's signal the first thing they will do is call on the radio and then on a phone number; neither any good if you are off shore. They will still send help of course.

Then there are all the times when you need help but it is not a Mayday, if you use a PLB then you are in for a scolding!

You can never guarantee getting through on a handheld, even close in shore.
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Old 05 August 2011, 03:42   #26
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thanks - I always thought it cleaned up the signal like filter so it makes the wave form cleaner...too much you make the wave form too clean hence distort....

maybe both is right! just different ways if saying it.....
No its not. Squelch has nothing to do with VHF signal processing. It measures the output of the audio amp. If the signal is below the level determined by the squelch knob then it cuts the audio output. The problem is when the wanted bit of the signal is bearly higher than the background noise level.

Also my understanding is that the squelch and volume controls do not affect the transmitted signal in any way. So if the CC is not hearing you then its not the squelch or volume its another problem.

Anyone going 15nm out from the coast should have a fixed VHF set AND a handheld in my mind.

Gary
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Old 05 August 2011, 03:59   #27
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Just another bit of info/experience to throw into the melting pot. I have a fixed set on my rib and I have raised the CG 30 miles away with only using 1w transmit power. This I believe is down to the aerial being mounted on the A-frame, and the CG having very high aerials with good gain. I have also picked up the CG from a similar distance on my handheld, though I doubt they would receive me.

(whilst not aerial related, there is no need to quote the previous message every time you post. We've all read the thread and know what's been posted and it makes for far too much scrolling ) Oh, and we're talking about aerial's not washing powder (Ariel) . Bring back Louise
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Old 05 August 2011, 04:29   #28
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Just another bit of info/experience to throw into the melting pot. I have a fixed set on my rib and I have raised the CG 30 miles away with only using 1w transmit power. This I believe is down to the aerial being mounted on the A-frame, and the CG having very high aerials with good gain. I have also picked up the CG from a similar distance on my handheld, though I doubt they would receive me.

(whilst not aerial related, there is no need to quote the previous message every time you post. We've all read the thread and know what's been posted and it makes for far too much scrolling ) Oh, and we're talking about aerial's not washing powder (Ariel) . Bring back Louise

Ok, i will stop adding whats already been said too. ha ha.
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Old 06 August 2011, 16:31   #29
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Ok the results. I went out yesterday, adjusted the squelch accordingly and hey presto, got the coastguard, although the fixed set on the other rib was much clearer and picked up other conversions going on.

Also worked really well when the other rib shouted to say he had caught something round his prop.

Thanks for the info chaps.

Getting a fixed VHF too.
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Old 15 August 2011, 14:08   #30
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Update on my progress

Just waiting for the fixed VHF to arrive now.

Would have been handy today though. As we pulled out the harbour i was monitoring channel 16 and 8 as was out with two other ribs. Heard an "Excersice Pan Pan" for a MOB being completed by a training boat in the area. on 8.

About ten minutes later heard CG on 16 co-ordinating rescue for the pan pan MOB, but not an excercise. I clairified the boats name and it was one in the same. Used 16 to contact CG and informed them of it being possible excersice and they asked me to check on channel 8 with the boat and call them back on 67. Long story longer, the boat replied AIO and yes it was training. So went to 67. I could hear the CG calling me but they couldnt hear me replying. Therfore went to 16 and it was all confirmed as an excercise and the boat concenred was all in order and they confirmed they couldnt hear me on 67 but loud and clear on 16.

So why could the CG not hear me on 67 but they could on 16. Is 16 a stronger airwave if this is possible?
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