[time-nuts] 60 KHz Receiver

[J. Forster]

Depends on your soil. New England is mainly rock with very poor conductivity.

-John

==============


> Hi
>
> Same gotcha as the horizontal dipole - most of the energy is shorted out
> by the ground. Think of a transformer with a shorted turn.
>
> Bob
>
>
> On Oct 5, 2010, at 5:58 PM, J. Forster wrote:
>
>> A loop around the house?
>>
>> -John
>>
>> ==============
>>
>>
>>> Hi
>>>
>>> Ok, the next layer to this onion is the antenna. At 100KC your antenna
>>> is
>>> 35X smaller than it is on 80 meters foot for foot. In other words, your
>>> 100' tall vertical on 80 equates to a <3 foot tall antenna at 100 KC.
>>> QRP
>>> on 80 with a 3' transmit antenna anybody? Been there done that, not
>>> much
>>> range at all. At VLF forget about transmitting with a horizontal
>>> antenna
>>> unless you are airborne.
>>>
>>> It's not just the antenna, the ground counts as well. If you are by the
>>> seashore that may not be a big deal. If you are inland, prepare to lay
>>> many very long radials.
>>>
>>> ----------
>>>
>>> After that you hit signal to noise. The receivers worked as well as
>>> they
>>> did because they had an enormous signal to work with. There's an
>>> amazing
>>> amount of crud running around down below 200 KHz these days. Even for
>>> timing you need a lot of signal to get good results.
>>>
>>> Bob
>>> KB8TQ
>>>
>>> Ham for way more than 30 years....
>>>
>>>
>>> On Oct 5, 2010, at 4:59 PM, paul swed wrote:
>>>
>>>> Well crazy as it sounds if you are at 100 KC you might just want 1
>>>> loran
>>>> tower in a chain or even fewer. You only need 1 station not 3. Timing
>>>> rcvrs
>>>> worked on one signal.
>>>>
>>>>
>>>> On Tue, Oct 5, 2010 at 4:46 PM, <shalimr9 at gmail.com> wrote:
>>>>
>>>>> Not necessarily, on 3 phase systems, you would have to be creative to
>>>>> get
>>>>> below .9
>>>>>
>>>>> You can easily get to .95 with a simple multipulse rectification.
>>>>> Beyond
>>>>> that, other than regulatory compliance, you do not gain much
>>>>> efficiency.
>>>>>
>>>>> I can't imagine these systems running on anything other than 3 phase
>>>>> power.
>>>>>
>>>>> Didier
>>>>>
>>>>> Sent from my Verizon Wireless BlackBerry
>>>>>
>>>>> -----Original Message-----
>>>>> From: "J. Forster" <jfor at quik.com>
>>>>> Sender: time-nuts-bounces at febo.com
>>>>> Date: Tue, 5 Oct 2010 13:37:21
>>>>> To: Discussion of precise time and frequency measurement<
>>>>> time-nuts at febo.com>
>>>>> Reply-To: jfor at quik.com, Discussion of precise time and frequency
>>>>> measurement
>>>>>      <time-nuts at febo.com>
>>>>> Subject: Re: [time-nuts] 60 KHz Receiver
>>>>>
>>>>> And the Power Factor sucks, so there is a lot less real power being
>>>>> used.
>>>>>
>>>>> -John
>>>>>
>>>>> =============
>>>>>
>>>>>> Ok, but that is no megawatt!
>>>>>>
>>>>>> Also, most of the transmitters were doing multi duty, handling
>>>>>> several chains simultaneously.  That would up the average power
>>>>>> proportionately.
>>>>>>
>>>>>> -Chuck Harris
>>>>>>
>>>>>> Poul-Henning Kamp wrote:
>>>>>>> In message<4CAB888B.4040604 at erols.com>, Chuck Harris writes:
>>>>>>>> It is a pulse transmitter.  It makes short bursts of 10 or 12
>>>>>>>> pulses,
>>>>>>>> and then waits one GRI, and then does it again.  I would think the
>>>>>>>> actual continuous power draw is around 10Kw.
>>>>>>>
>>>>>>> http://phk.freebsd.dk/photos/L9007M/dscf0458.jpg.html
>>>>>>>
>>>>>>> About 50kW for Ei�i (400kW, 9007M)
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
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>>>>>
>>>>>
>>>>>
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