[daip] 31DEC13, NOIFS problem

[정다운]

I am sorry. I forgot to let you know username and password.
Username : user1 or user2
Password : abc

If you still have a trouble with access to my data,  please let me know.

You are right. Korean VLBI data might be well calibrated in a pipeline,
but I just want to know the difference between a calibration with NOIFS and
without NOIFS. This is because I am a graduate student studying VLBI
calibration process in detail and I am also curious about the difference
between a pipeline-calibrated result and a manual calibrated result.

I did not think about running SNCOR 4 times for each IF. I think that is a
good idea and I should try it.

I will try to look at the output of NOIFS with PRTUV as soon as I get to my
office.

Thank you.
2016. 7. 1. 오전 12:49에 "Eric Greisen" <egreisen at nrao.edu>님이 작성:

> On 06/30/2016 06:23 AM, 정다운 wrote:
>
>> To do FPT(Frequency Phase Transfer), phase calibration, I need to use
>> SNCOR (OPCODE 'XFER').
>> When I use SNCOR (OPCODE 'XFER') to transfer low frequency phase to high
>> frequency, I'm concern that it will make a few problems if I do not use
>> NOIFS.
>> If I transfer 21.55 GHz phase to 43.10GHz and I have 4 IFs with 16MHz
>> bandwidth, IFs will be like this.
>>
>> IF1                 IF2                   IF3                IF4
>> 21.55GHz    21.566GHz    21.582GHz   21.598GHz  (real)
>> 43.10GHz     43.132GHz    43.164GHz   43.196GHz (transferred)
>>
>> 43.10GHz    43.116GHz    43.132GHz   43.148GHz   (but, real)
>>
>> I think that there will be differences between real IF frequencies and
>> transferred IF frequencies.
>>
>> However, If I use NOIFS, I will have an IF with 64MHz bandwidth.
>> IF1
>> 21.55 GHz  (real)
>> 43.10 GHz  (transferred)
>>
>> 43.10 GHz (real)
>>
>> I think there will be no problem with IF frequencies, so I concluded
>> that I needed to use NOIFS.
>>
>> You can access my data by Filezilla
>>
>> My IP address :
>> 165.132.28.151
>> port  : 22
>> data :
>> /home/kvnyonsei3/KVNFPT/K13035A.FITS
>>
>
> This tool is unfamiliar to me but we tried it and the connection was
> refused.  Apparently I actually have to have an account set up or
> "anonymous" has to be allowed in without a password - which is not a wise
> thing to allow.  Can you find some other way to make the data available?
>
> I do not understand your concerns about the frequencies since I do not
> know the detailed frequency structure of your data.  I do know that phase
> transfer is used with the Korean VLB data with very considerable success
> using a mix of AIPS and ParselTongue in a pipeline.  How does this differ
> from what you need?
>
> I have taken a look at SNCOR and it supports BIF and EIF.  Can you not run
> it 4 times changing the PHASPRM(29) and (30) appropriately for each
> IF?  This would be more accurate (??) than doing a single phase for all
> IFs.
>
> I would still like to find out what is wrong with NOIFS - have you looked
> at the output of NOIFS with a more preise tool like PRTUV?
>
> Eric Greisen
>
>
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