[time-nuts] WWVB New Modulation scheme...

Peter Gottlieb nerd at verizon.net
Sat Oct 27 03:26:17 UTC 2012


I've used the HP 3586 for measuring AM carrier frequencies as well as my Tek 
495P (both referenced to Rb) for higher frequencies such as air band.

Some carriers are dead nuts on while others are quite far off (at least to my 
mind) although I've never found one outside of its required tolerance.

It seems possible to measure pretty accurately with these instruments, at least 
on AM or CW signals, but not sure the best way for FM.  I've played with the HP 
53310A but haven't set it up for precise measurements yet, or really studied 
what all it is capable of.

Peter


On 10/26/2012 11:10 PM, Orin Eman wrote:
> Looks like they _might_ have been 30 _Hz_ out... I had to tune to 1188.97
> to get a 1kHz beat in upper sideband mode a few minutes ago but they are
> within 10Hz of where they are supposed to be now - according to my radio
> anyway (I just checked the radio against WWV at 5MHz and it was less than
> 10Hz out).
>
> Orin, KJ7HQ.
>
> On Fri, Oct 26, 2012 at 7:41 PM, Bob Camp <lists at rtty.us> wrote:
>
>> Hi
>>
>> Not to mention attention from the guy who *should* be 3 channels over …
>>
>> Bob
>>
>> On Oct 26, 2012, at 10:31 PM, Peter Gottlieb <nerd at verizon.net> wrote:
>>
>>> It would attract a lot of attention from people not finding it at the
>> right place on the dial.
>>> On 10/26/2012 10:09 PM, Max Robinson wrote:
>>>> The frequency of 1190 indicates an AM station.  I assume you mean 30
>> Hz.  An error of 30 KHz would attract a lot of attention from Charley.
>>>> Regards.
>>>>
>>>> Max.  K 4 O DS.
>>>>
>>>> Email: max at maxsmusicplace.com
>>>>
>>>> Transistor site http://www.funwithtransistors.net
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>>>> ----- Original Message ----- From: "Chuck Forsberg WA7KGX N2469R" <
>> caf at omen.com>
>>>> To: "Discussion of precise time and frequency measurement" <
>> time-nuts at febo.com>
>>>> Sent: Friday, October 26, 2012 12:14 AM
>>>> Subject: Re: [time-nuts] WWVB New Modulation scheme...
>>>>
>>>>
>>>>> I have my 3586b slaved to my Thunderbolt along with a
>>>>> Flex-1500 radio, Racal-Dana counter, Advantest Spectrum
>>>>> analyzer and Gigatronics signal generator.
>>>>>
>>>>> You might be interested to know KEX 1190 in Portland
>>>>> is about 30 kHz low.  At least they aren't spewing
>>>>> IBOC lately.
>>>>>
>>>>> --
>>>>> Chuck Forsberg WA7KGX N2469R     caf at omen.com   www.omen.com
>>>>> Developer of Industrial ZMODEM(Tm) for Embedded Applications
>>>>>   Omen Technology Inc      "The High Reliability Software"
>>>>> 10255 NW Old Cornelius Pass Portland OR 97231   503-614-0430
>>>>>
>>>>>
>>>>> _______________________________________________
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