Reply
 
Thread Tools Search this Thread
 
Old 29 June 2004, 05:26   #31
Member
 
Country: UK - England
Town: Southampton
Length: under 3m
Join Date: Jun 2004
Posts: 7
@Pete, Just to add to your point. I do not work for a company. I work for myself, making these units to help me fund my way through University... so I am not sure how this fits in with the forum rules. I do encourage any questions, as I don't pretend to answer all questions through my eBay listings.

As a further point to the discussion at hand, I suggest these devices as a way of determining if your boat has been stolen or not (by the use of automated location requests through the trace provider), rather than as a tracker. Having said that, you can help the Police with their enquiries by providing them with a rough location of where the boat has moved to.

Dan.
__________________

__________________
JagoHarry is offline   Reply With Quote
Old 29 June 2004, 05:42   #32
Member
 
Country: UK - England
Town: nr Lymington
Boat name: JU-JU
Make: Halmatic PAC22
Length: 6m +
Engine: 140.5 Mermaid
Join Date: Sep 2003
Posts: 1,400
Pete7 thanks for flagging this up they look really interesting and yes I think a sea trial would be good.

Dan a couple of questions:-

what is the full cost ,(sorry Iím being a bit slow this morning) as far as I can work out, it is the cost of the unit(£18.99), sim card (£6), sim activation(£1.50), followus fee (£10) and that is it unless you use it then you pay for the use.
Can you pot the unit?
If it is located in a boat what will affect its range?
How long does the battery powered one last for? my boat is 24v so this would be my best option unless you do a 24v version?

Des
__________________

__________________
Scary Des is offline   Reply With Quote
Old 29 June 2004, 06:27   #33
Member
 
Country: UK - England
Town: Southampton
Length: under 3m
Join Date: Jun 2004
Posts: 7
Des,

Thanks for your questions, I will do the best I can to answer them.

Costs
Basic Tracker is £18.99
Add £10 for the listening device (bug) option
Add £10 for a 12V Power Supply option
Add £6 if you want me to supply a Vodafone Sim Card (This will need registering in a mobile phone capable of using the Vodafone network first).

Regarding the actual tracing, that's a tracing company. I suggest FollowUs (http://www.followus.co.uk), and reading their reference material will help you. You buy a set number of credits, which you use for location traces. Each trace costs 1 credit, with a zoom in on a location for 0.05 credits. Registering a sim card costs 5 credits (only needs doing once). They also charge 1 credit for checking consent (for tracing) every so often.

Here are their current offers (only visible to actual members, so I have pasted that info here)

June Offer: 50 LOCATION CREDITS £14.99 (about 30p a trace)
Top-Up 20 CREDITS £10.00
Top-Up 50 saving of 5.00 on your LOCATION CREDITS £20.00
Bulk Buy Saver - Top-Up 600 saving of 150.00 on your LOCATION CREDITS £175.00

Potting
I'm not sure what you mean by this. I am guessing that you are referring to a potting compound to ensure moisture resistance? I'm not sure how it would affect the reception of the tracker (think mobile phones here), but as long as you don't affect the electrical resistance of the tracker, and its not too thick, it should be fine. That said, even a plastic bag tightly sealed should do the trick.

Range
Regarding range, again, think mobile phones. It is basically a heavilly modified mobile phone, so if you have reception for a vodafone mobile in a given part of the boat, then the tracker will be fine. Things such as RF or microwave radiation will probably affect range.

Battery Life
I have not been able to test battery life properly, and it heavily depends on the batteries used. Normal current consumption is between 5mA and 50mA, 200mA at peak when first turned on. Obviously a higher current rating for the listening device. I have heard of anywhere between 1-3 weeks for them though.

Supply Voltage
The power supply for the trackers is a regulated 4.4V supply, which can accept an input voltage of 6V to 14V. I'm not sure if it can handle up to 24V without modification. I will need to do some calculations if you require it to handle 24V, as it will most likely need modification (due to heat disipation for the power regulator). Unless you already have a step down transformer to supply an input voltage of 6V to 14V. If there is a demand (2-3 people) for a 24V version, I will happily consider designing a 24V input supply, but it will probably be about £2-4 more expensive (compared to the 12V version) due to heat sinking and suitable casing. Eitherway, I will investigate it for you.

I hope that this helps! Any more questions, fire them my way. I'll put these questions up on my site too (eventually).

Dan.
__________________
JagoHarry is offline   Reply With Quote
Old 29 June 2004, 07:10   #34
Member
 
Country: UK - England
Town: nr Lymington
Boat name: JU-JU
Make: Halmatic PAC22
Length: 6m +
Engine: 140.5 Mermaid
Join Date: Sep 2003
Posts: 1,400
Thanks Dan
I asked about potting (resin encapsulating) because the wet/salty environment on a boat is a killer for anything electric and even so-called waterproof housing can suffer from water ingress. Some of the marine electronics manufactures use waterproof housing filled with nitrogen to stop this problem. Potting would prevent access to the sim or other things on the unit would this be a problem?

Space is a problem on most boats and for me it might be better to have the box of tricks and power supply hidden in the bottom the boat and a separate aerial, is this possible?

With regard to batteries I think my best option would be a separate 12v battery because I tend to turn of the 24V system to stop quiescent drain. I can get a 2.2Ah sealed battery for £8 or would it be better to go for a 6v battery?
Des
__________________
Scary Des is offline   Reply With Quote
Old 29 June 2004, 07:16   #35
Member
 
Country: UK - England
Town: Nutbourne
Boat name: Renegade
Make: Porter
Length: 6m +
Engine: 140 Tohatsu
MMSI: 235022904
Join Date: Dec 2003
Posts: 1,195
Des
Is your 24V supplied from 2 x 12V batteries?
If it is you can take 12V from just 1 of them.
__________________
Mark H
"A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools" Douglas Adams
Mark Halliday is offline   Reply With Quote
Old 29 June 2004, 07:47   #36
Member
 
Country: UK - England
Town: Beverley
Boat name: TBA
Make: Unknown
Length: 6m +
Engine: Tohatsu 8Hp
Join Date: Apr 2004
Posts: 257
I had a look at followus.co.uk yesterday, not quite sure if they send more text messaages to authorise tracking after the initial one, or just warnings? If so, I can see that this could be a problem, how would you know to reply to the text?
Anyone know the answer? Otherwise looks like a great idea.
__________________
Roohairy

"I'm not lost, I'm exploring...."
roohairy is offline   Reply With Quote
Old 29 June 2004, 07:48   #37
Member
 
Country: UK - England
Town: nr Lymington
Boat name: JU-JU
Make: Halmatic PAC22
Length: 6m +
Engine: 140.5 Mermaid
Join Date: Sep 2003
Posts: 1,400
Quote:
Originally Posted by Mark Halliday
Des
Is your 24V supplied from 2 x 12V batteries?
If it is you can take 12V from just 1 of them.
Mark look at this.

12V from a 24V system

Des
__________________
Scary Des is offline   Reply With Quote
Old 29 June 2004, 08:19   #38
Member
 
Country: UK - England
Town: Southampton
Length: under 3m
Join Date: Jun 2004
Posts: 7
Quote:
Originally Posted by roohairy
I had a look at followus.co.uk yesterday, not quite sure if they send more text messaages to authorise tracking after the initial one, or just warnings? If so, I can see that this could be a problem, how would you know to reply to the text?
Anyone know the answer? Otherwise looks like a great idea.
They send a single text message to check for authorisation, which requires a reply from the sim card being tracked with the tracker to say 'yes'.

The subsequent messages are messages saying that if you no longer wish to be traceable, then go to the website, and enter the specified pin number (which is in the text message itself). It does not require a reply. The tracker will not give an audible indication that a text message has been received too.

Hope this helps this query.
Dan.
__________________
JagoHarry is offline   Reply With Quote
Old 29 June 2004, 08:23   #39
Member
 
Country: UK - England
Town: Southampton
Length: under 3m
Join Date: Jun 2004
Posts: 7
Des, no worries, here is some more info.

Quote:
Originally Posted by Scary Des
I asked about potting (resin encapsulating) because the wet/salty environment on a boat is a killer for anything electric and even so-called waterproof housing can suffer from water ingress. Some of the marine electronics manufactures use waterproof housing filled with nitrogen to stop this problem. Potting would prevent access to the sim or other things on the unit would this be a problem?
If you want to 'lock' the sim into the phone, then fine. It should not be a problem as far as I can see. I understand about the salty/moist atmosphere, and would thus recommend it. The tracker is covered in foam, which just cushions the electronics.


Quote:
Space is a problem on most boats and for me it might be better to have the box of tricks and power supply hidden in the bottom the boat and a separate aerial, is this possible?
A separate aerial is not possible, since the tracker requires a short aerial due to its high frequency of operation (900Mhz). A ceiling or hollow pipe, etc would be better, which is nearer the top of the boat.

Quote:
With regard to batteries I think my best option would be a separate 12v battery because I tend to turn of the 24V system to stop quiescent drain. I can get a 2.2Ah sealed battery for £8 or would it be better to go for a 6v battery?
A 12V battery would be fine, a 6V battery would probably last longer, as there would be less wasted energy disipated as heat (due to the voltage drop performed by the power regulator). I will check it works with 6V later tonight.

Hope this helps,
Dan.
__________________
JagoHarry is offline   Reply With Quote
Old 29 June 2004, 09:35   #40
Member
 
Country: UK - England
Town: Southampton
Length: under 3m
Join Date: Jun 2004
Posts: 7
I have now started a list of FAQ on my site (many are from this discussion) which should help answer most questions. If you are still unsure, ask away!

http://www.jagoharry.co.uk

Dan.
__________________

__________________
JagoHarry is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 15:12.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.