[IGSSTATION-5620] FW: HOB2 external frequency H-maser swapover [SEC=UNCLASSIFIED]

Nicholas.Dando at ga.gov.au Nicholas.Dando at ga.gov.au
Mon Dec 16 19:57:11 PST 2013

Site ID :                HOB2
DOMES:               50116M004
Location:              Mt Pleasant Observatory, Hobart, Tasmania Australia

Dear colleagues,

Please be advised of some changes to the external frequency of the HOB2 receiver in the previous few weeks.

NASA H-maser > non maser oscillator for a few hours > NASA H-maser

NASA H-maser > Vremya-CH V1005A H-maser

It is anticipated the HOB2 receiver will be returned to the NASA H-maser sometime in the future. Once we have updated information we will make the necessary changes to the site log.

Nicholas Dando 
National Geospatial Reference Systems
Minerals and Natural Hazards Division  |  GEOSCIENCE AUSTRALIA
Cnr Jerrabomberra Avenue and Hindmarsh Drive Symonston ACT
GPO Box 378 Canberra ACT 2601 Australia
Applying geoscience to Australia's most important challenges

Dear GA,
We are going to change out some vacuum pump components in the NASA H-maser here at Hobart. In preparation for this we have moved the entire Hobart observatory to the Vremya-CH V1005A (Russia) H-maser frequency standard. We did this today soon after 0100 UT on December 2nd. This would have affected your GPS receiver external oscillator connection briefly during the swap.


> We were only on the non maser oscillator for a few hours. However, we 
> discovered that the room thermostat had failed and so we shall be 
> doing more work affecting the H-maser tomorrow. Since the room 
> temperature is not constant, frequency stability could be degraded 
> over periods greater than 0.5 hours.
> On 14/11/2013 12:13:
>> Hi GA,
>> Our NASA maser H-maser needs some work.
>> We will disconnect it and run the station from a non maser oscillator 
>> for a little while. This will commence around UT 0110 on 14 November 
>> 2013.
>> We will keep you posted as to when it returns to H-maser freq 
>> standard today.
>> Also we may need to do something similar next Monday and we will keep 
>> you informed of that too
>> Regards,

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