[time-nuts] 60 KHz Receiver

[J. Forster]

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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