Mon-R2, W75, W49, W51 CepA and Orion-KL; 22GHz water masers

[Michiel Klaassen]

Hi All,

With our 9.3m telescope we have done some more measurements on water masers on 22GHz.

Measuring 22GHz masers with a 1m dish is also possible as Eduard has shown!

A thermostat was used to stabilize the DRO. If not done so; the signal will drift in frequency, and adding/stacking will result in no result or very poor and misformed result.

Pointing/tracking the telescope is also difficult; an absolute elevation encoder is a must.

Drifting (rain) clouds in front of the beam will also attenuate the signal.

We modified the DRO osc. setting of the Norsat 9000LDF slightly, by increasing the frequency of the LO. This results in a lower IF frequency of 1.1GHz. 

This frequency now can be captured by a standard SDR dongle.   

Calibrating the intensity scale is difficult; almost all the masers vary, so cannot be used as a standard Jy scale., but still working on it. Venus can be used as a standard GHz source it seems.

The 22GHz masers can be found in the maser Dbase; https://maserdb.net/

All data was captured with Cfrad2.exe on W7 and W10 machines.

We also did a drift measurement on W49 to show that without tracking motors you still can capture W49. 

Next month I will put this 2022 session also on the website. 

Michiel

parac.eu

[pa0...@pa0ply.nl]

Subj. Absolute encoder for elevation

Georg, DF1SR, designed a 12 bits HH-12 inclinometer encoder.

Probably useful for this application?

Br. Jan Kappert PAoPLY

Verstuurd vanaf: myMail voor iOS

dinsdag 30 augustus 2022 16:32 +0200 van vmin...@gmail.com <vmin...@gmail.com>:

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[pa0...@pa0ply.nl]

Verstuurd vanaf: myMail voor iOS

dinsdag 30 augustus 2022 16:32 +0200 van vmin...@gmail.com <vmin...@gmail.com>:

Hi All,

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[Eduard Mol]

Hi Michiel,

Excellent results, well done!

Even with a 1 metre dish pointing is somewhat challenging at 22 GHz. I can only imagine how hard it is to point that 9 metre dish....

Maybe I overlooked it but Mon-R2 seems to be missing in the file you sent.

So far I have detected W3(OH), Orion KL, W49, W51 and W75 with the 1 metre dish. 

Best regards,

Eduard

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[Michiel Klaassen]

Jan,

I use an absolute elevation encoder with resolution of about 16 bit.

Marcus,

for AZ a 16bit analog resolver with AD2S82 is used.

For EL a BWm426 absolute inclinometer; 0.01 deg, res 0.001 deg. dual axis; but one used for now. Modbus comm.

As always, do not use my solution; you have a better one.

Eduard,

Indeed, Mon R2 zipped off; I caught and attached it anyway.

Michiel

parac.eu

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