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| * Eight single pixel receivers A,B,C,D, and the 3x3 dual-polarisation HERA receiver are installed in the [http://www.iram.es/IRAMES/telescope/telescopeSummary/receiver6.html receiver cabin]. | ==== ABCD dual polarisation receivers (till mid March 2009) ==== * Eight single pixel receivers A,B,C,D are installed in the [http://www.iram.es/IRAMES/telescope/telescopeSummary/receiver6.html receiver cabin]. It is planned to replace them by EMIR in mid March 2009. |
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| * [http://www.iram.es/IRAMES/groups/receiver/receiver.html More information on the heterodyne receivers.] | |
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1. HERA is a heterodyne receiver array consisting of two arrays of 3x3 pixels with 24" spacing. The two arrays have orthogonal polarization (V, H) the two polarizations pointing at identical locations on the sky. HERA is equipped with a derotator allowing to follow a source in the sky maintaining the same "footprint". The tunable range is between 215 and 272 GHz. In this range the beamwidth varies between 12" and 9". * [http://www.iram.es/IRAMES/otherDocuments/manuals/HERA_manual_v20.pdf HERA manual, version 2.0] by Schuster et al. 2006 * [http://esoads.eso.org/abs/2004A%26A...423.1171S Schuster et al. 2004, A&A, 423, 1171] A 230 GHz Heterodyne Receiver Array for the IRAM 30m telescope ([http://www.iram.es/IRAMES/otherDocuments/manuals/0179hera.pdf local copy]) |
ABCD dual polarisation receivers (till mid March 2009)
Eight single pixel receivers A,B,C,D are installed in the [http://www.iram.es/IRAMES/telescope/telescopeSummary/receiver6.html receiver cabin]. It is planned to replace them by EMIR in mid March 2009.
- Four of the 8 A,B,C,D receivers can be used simultaneously. HERA cannot be combined with other receivers.
Rx |
# |
Pol |
Rx combinations |
tuning range |
Trx |
IF |
IF Bw |
Gim |
Rem. |
||||
|
|
|
AB |
CD |
AD |
BC |
|
[GHz] |
[K] |
[GHz] |
[GHz] |
[dB] |
|
A100 |
1 |
V |
X |
|
X |
|
|
(72-)80.0-115.5 |
60-80 |
1.5 |
0.5 |
>20 |
1. |
B100 |
1 |
H |
X |
|
|
X |
|
(72-)81.0-115.5 |
60-85 |
1.5 |
0.5 |
>20 |
1. |
C150 |
1 |
V |
|
X |
|
X |
|
130-183 |
70-125 |
4 |
1 |
15-25 |
|
D150 |
1 |
H |
|
X |
X |
|
|
130-183 |
80-125 |
4 |
1 |
08-17 |
|
A230 |
1 |
V |
X |
|
X |
|
|
197-266 |
85-150 |
4 |
1 |
12-17 |
|
B230 |
1 |
H |
X |
|
|
X |
|
197-266 |
95-160 |
4 |
1 |
12-17 |
|
C270 |
1 |
V |
|
X |
|
X |
|
241-281 |
125-250 |
4 |
1 |
10-20 |
2. |
D270 |
1 |
H |
|
X |
X |
|
|
241-281 |
150-250 |
4 |
1 |
9-13 |
2. |
Remarks:
Using a special external LO, frequencies down to 77 GHz can be measured with good sideband rejection. For frequencies below 77 GHz, the sideband recection becomes weaker, and the sideband ratio reaches unity at 72 GHz. [http://www.iram.fr/IRAMFR/PV/lowfreqs/report.ps.gz Test report of 2004], [http://www.iram.fr/IRAMFR/PV/lowfreqs/spectra.html Test spectra]
- Noise increasing with frequency