Topband: Monopole Radiation Patterns, takeoff angles etc

[ZR]

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


----- Original Message ----- 
From: "Hardy Landskov" <n7rt at cox.net>
To: "Mike Waters" <mikewate at gmail.com>; "topband" <topband at contesting.com>
Cc: "ZR" <zr at jeremy.mv.com>; "Richard Fry" <rfry at adams.net>
Sent: Monday, May 07, 2012 11:02 PM
Subject: Re: Topband: Monopole Radiation Patterns, takeoff angles etc


>
> ----- Original Message ----- 
> From: "Mike Waters" <mikewate at gmail.com>
> To: "topband" <topband at contesting.com>
> Cc: "ZR" <zr at jeremy.mv.com>; "Richard Fry" <rfry at adams.net>
> Sent: Monday, May 07, 2012 7:35 PM
> Subject: Re: Topband: Monopole Radiation Patterns, takeoff angles etc
>
>
>> Let me expand on what I said previously.
>>
>> I always thought that ground wave propagation decreased with frequency. 
>> For
>> example, don't AM broadcast stations in the lower end of the AM broadcast
>> band have greater coverage than at the high end, all things being equal?
>
> Yes most definately. Ground wave is substantial over sea water. Why do you 
> think
> the international distress frequency for ships was at 500 KHz?
>
>> I have always thought that, and I also think that this phenomenon 
>> increases
>> as we move through 160 meters, then through 80, 40, etc. etc. and we 
>> become
>> more and more dependent on higher angles there for at but local
>> communications.
>>
>> Of course, this is somewhat dependent on the time of day, whether we are
>> talking about daytime or nighttime propagation.
>
> What you say is about lowering frequency is true. This is why submarines 
> can
> communicate throughout the World because at low enough frequencies, the 
> whole
> planet Earth looks like an insulator.
>
> 73 Hardy N7RT
>
>
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