Re: [IRCA] Updated frequency offset for Tonga?
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Re: [IRCA] Updated frequency offset for Tonga?

That's really intriguing Chuck.  Thanks for pointing that article out.
I wonder what causes the spread in the audio spectra that I often see when I get, say, a 400Hz beat to WWV at night? (compared to the more solid single frequency beat note that I usually see with something like KSL) This happens with my NetSDR and R8 so doesn't seem related to the radio used. The shifts may well average out to a single beat note, but it's pretty ugly on a second by second basis.
I'll have to find out where got the suggestion of using WWVB as a reference rather than the higher frequency standard stations, due to propagation anomalies. 

best wishes,

Nick






  At 04:40 29-07-13, you wrote:
According to http://www.febo.com/pages/hf_stability/ Doppler is non-existent except at sunrise and sunset, and even then it's only causing .5 Hz of error. 

This doesn't take into account the occasional geomagnetic storm.

Chuck

On 7/28/2013 8:33 PM, Nick Hall-Patch wrote:
I think the downside to using the higher frequencies is that they can be quite badly Doppler shifted and smeared by propagation anomalies, Walt, so that although they demodulate OK there isn't a single frequency that you can accurately "hang your hat onto" . 


best wishes,

Nick



At 02:46 29-07-13, you wrote:

Yes, I look for the 2 side bands, and I didn't see any, but correct, the
signal was not strong.  I calibrate the Perseus with WWV/H on 15 MHz .  I
had read that calibrating on a higher frequency is more accurate...Walt

On Sunday, July 28, 2013, Nick Hall-Patch wrote:

> How strong was the overall signal on 1160 at the time Walt?   When a
> signal is weaker, I find that the IBOC sidebands can drop below the
> noise/splatter level (I'm assuming that you were looking at the sidebands
>  on the Perseus display); I think they're about 30dB below the carrier
> strength.
>
> However, I could still hear IBOC this morning on 1147 and 1173 kHz at
> 1115UT, so I think something on 1160 is still cooking.
>
> best wishes,
>
> Nick
>
>
> At 17:42 28-07-13, you wrote:
>
>> I noticed no iboc this morning on 1160, though...walt
>>
>> On Sunday, July 28, 2013, Guy Atkins <atkinsguy@xxxxxxxxx> wrote:
>> > Thanks for the confirmation of KSL as a good calibration choice, Nick. I 
>> > remember now that you and I talked about this station previously for
>> this
>> > purpose.
>> >
>> > 73,
>> >
>> > Guy Atkins
>> > Puyallup, WA
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