Topband: Monopole Radiation Patterns, takeoff angles etc

[Herb Schoenbohm]

Some USN subs used to be retrofitted here in the VI and I was called to 
pick up some of the transmitters which required a fork lift to put the 
transformers on the back of a truck.  The RF deck used a pair of 
4CX5000's and they appear to drive some sort of transducer for 
underwater communication. One of the techs called them "fish phones" for 
underwater to surface communications. I am not sure what the modulation 
scheme was nor what technology it was replaced with but both methods 
were a form of two way underwater communications.  I had heard that the 
mile long trailing wire method was abandoned in favor of a brute force 
method to drive data via salt water to the surface.

Herb Schoenbohm, KV4FZ




On 5/8/2012 9:38 AM, ZR wrote:
> ELF sub communication was to get a signal to a submerged sub and it still
> took megawatts and an extremely slow bit rate. All it did was to tell the
> sub to come up enough to deploy its satellite antenna and get high speed
> burst data.
>
> Carl
> KM1H
>
>
>