[PSUBS-MAILIST] electronic question,

[Alec Smyth via Personal_Submersibles]

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 a
> comparison between the two.
> It could be an electronics problem if the signal is clear but not being
> amplified
> enough. If all else fails you could take it to an electronics person & get
> them
> to amplify the sound a bit more.
> I had been wondering whether those units could be modified to transmit at a
> higher power. Maybe the transmitter might not take it, but generally there
> is
> a healthy safety margin with electronics. That would be an interesting
> question
> to 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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