[time-nuts] Why the fuss?

Rob Kimberley robkimberley at btinternet.com
Fri Sep 28 08:36:14 UTC 2012


Tom,

We had a similar problem at a BBC site when I was selling Datum in the UK.
We managed to get round the problem with a better antenna. The third
harmonic of the UHF wasn't slap bang on L1 but close enough with a basic GPS
antenna to kill GPS.

Rob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Tom Miller
Sent: 27 September 2012 18:44
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Why the fuss?

Under other issues, I have one where GPS could not be used. It was at a UHF
TV station where the third harmonic fell right in the L1 band. A 220,000
watt UHF transmitter driving a gain antenna for 5 MW EIRP will always
produce some third harmonic near the antenna. There was no access to GPS
within 1 km of the site.

They were using the WWVB signal as the time and frequency reference. 
Luckily, the conversion the DTV moved them to a new channel and now they can
use the GPS.


Tom

----- Original Message ----- 
From: "Bob Camp" <lists at rtty.us>
To: "'Discussion of precise time and frequency measurement'" 
<time-nuts at febo.com>
Sent: Thursday, September 27, 2012 1:02 PM
Subject: Re: [time-nuts] Why the fuss?


Hi

Right here in PA for one. You essentially can not buy a new house without
there being various conditions written into the title. One universal one is
"no antennas". The only exception is for one 19" sat dish for TV, since
that's a federal mandate.

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of brent evers
Sent: Thursday, September 27, 2012 10:57 AM
To: jfor at quikus.com; Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Why the fuss?

Zoning, Legal?

Where?

Brent

On Thu, Sep 27, 2012 at 10:41 AM, J. Forster <jfor at quikus.com> wrote:
> Because:
>
> LORAN-C is gone.
>
> Not all can use GPS because of siting, horizon, zoning, legal, and other
> issues. Not everyone can erect antenna towers.
>
> There is nothing else, except perhaps WWV or CHU on HF.
>
> -John
>
> ==================
>
>
>
>> I cannot think of a time-nuts WWVB reference requirement
>> that cannot be better satisfied with a GPSDO.
>>
>> Will  NIST publish a public domain reference circuit?
>> That would allay patent concerns.
>>
>> --
>> 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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>
>
>
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