[PSUBS-MAILIST] electronic question,

[hank pronk via Personal_Submersibles]

 Hi Alec, you could be onto something there!  I fill it with oil upside down but the oil is like tar, so an air bubble could form.Hank
    On Monday, October 15, 2018, 6:04:13 PM MDT, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Hi Hank,
I noticed you had a rubber cup over the transducer, secured as I recall with a hose clamp. Could you have an air bubble under that? If so that might very well attenuate the signal massively.
Best,Alec
On Mon, Oct 15, 2018 at 7:19 PM Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Hank,I think those units are around 5Watts, so not a lot of power.They probably limit the power because they are designed for diver depths &they would have to have bigger batteries etc & a bulkier unit for more power.Maybe the transducer doesn't receive well when it has a lot of pressure on it.Is the sound coming through headphones or a speaker. Have you tried acomparison between the two. It could be an electronics problem if the signal is clear but not being amplifiedenough. If all else fails you could take it to an electronics person & get themto amplify the sound a bit more. I had been wondering whether those units could be modified to transmit at ahigher power. Maybe the transmitter might not take it, but generally there isa healthy safety margin with electronics. That would be an interesting questionto ask OTS.Alan



On 16/10/2018, at 11:19 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:


Hi All,I am planning to buy one OTS unit for Gamma so I can talk to another sub, but I intend to sort out my existing radio troubles.  My radio in the sub sent a signal to my surface radio and they could hear me perfectly at 225 feet with super bad turbidity and debris in the water.  When the surface radio sent a message to the sub, the sub radio was clear but very faint.  Is it possible that the surface radio did not have sufficient current to power it.  The surface radio uses a 12 to 24 v power converter and Gamma feeds its radio off a huge 24v bank.  Does the radio take more power to transmit than to receive, if so that might be my problem.  Maybe winter will wait for me to test this theory.Hank

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