On 11/4/2015 10:53 PM, Jim Henderson wrote:
> On Wed, 04 Nov 2015 22:14:15 +0000, Stephen wrote:
>
>>> Could be - generally a harmonic frequency can cause weirdness as well -
>>> I
>>> was more talking about why it's lines and not just snow.  The proximity
>>> of the transmitter to the "receiver" is what causes that.
>>>
>>>
>>   From the little I know only having worked, with Comms guys. You are
>> right but then you could tell me anything. It is all magic to me.
>> They even told me that our phone calls were bounced off the sky and the
>> sea. And I believed them.
>
> Well, I do have a radio license. ;)
>

So do I. Albeit the lowest level (RT). I could use a marine radio on a 
fishing vessel or stand in for the RO on an Oil Rig.


> But that's the reason that proximity to the transmission point for the EM
> waves matters - and a closer but power power (at transmission point)
> overpower a signal that's farther away but stronger.  With a 5W
> transmitter that's not well filtered, an amateur radio operator can
> disrupt commercial radio (AM/FM) and TV (VHF/UHF) transmissions quite
> significantly.  Every amateur radio operator has to learn at least a
> little about this in the US, because we're responsible for dealing with
> harmful interference we might cause with our gear.
>

It is quite a fearsome exam. With Morse code and regulations.

> Even with well-filtered equipment, though, if I put the transmission
> source for my radio right next to a computer monitor or CRT display, I
> can cause some interference.
>

Don't forget the cable. Bad connections can cause reflections. ;-)



-- 

Regards
     Stephen

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