subs’

[Mike GormanParticipant @mikegorman61436]

[Mike GormanParticipant @mikegorman61436]

Hi,

 Just returning to boats as my aicraft don’t last long enough! 

I used to buid Sub’s from scratch in the late 60s early seventies and found 27 megs’ O.K. or is there a better system, I use 2.4 on my aicraft but don’t know if it will work through water. Incidentali I built a 1mtr “Perkasa “at the time and loved it so much that I just got the one fron Vosper Perkasa Company. THe Lake I used

was at New Brighton , Wirral

   cheers,

 

 

 

 

 

 

 

Any veiwes or opinions  wecome   MIKE

[sammykParticipant @sammyk]

hi mike ,i have been told that that 2.4  systems dont work to well in subs maybe some one will answer your post who knows more about subs.the good news is that it works fine on surface craft.regards sammyk

[The Long BuildParticipant @thelongbuild]

2.4 a no go for any subs going under the water.

[60wattParticipant @60watt]

Posted by Mike Gorman on 11/11/2009 16:32:44:

Any veiwes or opinions  wecome   MIKE

 Not my view, Mike.

http://www.modelsubmarines.org/page6.html

 

Hitec and cloned receivers are inexpensive in synthesised 40 FM format so it is worthwhile seeking out sub users if it is worthwhile switching from 27Mhz.

[Mike GormanParticipant @mikegorman61436]

Thank’s for the info guys’ and mabe someone can tell me if I can change my 35 megs tranny into 40 megs? certainly sounds like 40 megs is the way to go as at one of the lakes Ihope to sail  they have problems with a  ham radio nearby!

 

                    thank’s again MIKE.

[Mike GormanParticipant @mikegorman61436]

Thank’s for the info guys’ and mabe someone can tell me if I can change my 35 megs tranny into 40 megs? certainly sounds like 40 megs is the way to go as at one of the lakes Ihope to sail  they have problems with a  ham radio nearby!

 

                    thank’s again MIKE.

[60wattParticipant @60watt]

35 to 40 conversions can only be done by the manufacturer and it is more expensive than a new transmitter and receiver.

A 40 FM receiver for example will cost £3 + £4 post from Hong Kong.On the downside you have to ask around to find where to get Esky or Sunupp compatible crystals.You can get synthesised receivers for £10 so you can guess what a replacement 40FM set costs.

[Mike DavidsonParticipant @mikedavidson22772]

Having worked on real submarines, I can tell you that they use very low frequencies to communicate with submarineswhere VHF waves go dead straight in line of sight, and the VLF waves tend to curve down towards the earth. I have not even attempted to communicate with a submerged model yet, but we could follow the big boys and use a buoyant wire aerialtowed behind. The only way to tell one is there is if you see a line of seagulls drifting along sideways at fifteen knots. I suppose you could use a very thin whip antenna poking up out of the water surface, but as I said , I have never done it so I cannot say.

[60wattParticipant @60watt]

http://www.modelsubmarines.org/page6.html

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