[time-nuts] Re: Loop Antennas

[Bob Camp]

Hi

The next layer to this is that some (but not all) WWVB receiver designs appear to rely
upon the “bandpass filter” of the antenna to provide reasonable rejection of “crud”. 

Having any sort of resonant circuit out in the back yard has implications. As the resonance
shifts with temperature, so does the phase shift. At VLF phase is indeed a big deal. Just
how big a deal ….. 

As with a lot of things, you can indeed measure outside temperature and model this or that. 
Lots of fun can be had.

Bob

> On Jun 7, 2023, at 5:30 PM, Graham / KE9H <ke9h.graham at gmail.com> wrote:
> 
> For WWVB time signals, I use a resonant ferrite rod antenna, but depending on the rod, the antenna bandwidth can be several hundred to several thousand Hz. Resonant multi-turn loops are likely to be similar.
> 
> You will need a broad-band (non-resonant) loop for receiving Loran-C, due to the much wider modulation bandwidth of the signal.
> --- Graham
> 
> On Wed, Jun 7, 2023 at 3:46 PM Bob Camp via time-nuts <time-nuts at lists.febo.com <mailto:time-nuts at lists.febo.com>> wrote:
>> Hi
>> 
>> There are a number of sites around the web that go through the details
>> of doing large-ish loop antennas for various LF signals. Are you trying to
>> do something small (fit in your pocket) or something fairly large (10 foot 
>> diameter) ? 
>> 
>> Bob
>> 
>> > On Jun 7, 2023, at 2:25 PM, JOHN HARTZELL via time-nuts <time-nuts at lists.febo.com <mailto:time-nuts at lists.febo.com>> wrote:
>> > 
>> > Dear time nuts,
>> > 
>> > Who has experience using loop antennas on the front end of receivers for receipt of Loran C, and other time signals?
>> > 
>> > Kind regards,
>> > 
>> > John
>> > 
>> > https://linkedin.com/in/john-h-6a131b12/
>> > 
>> > 
>> > 
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