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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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| 1. 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] | 1. 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]] |
ABCD dual polarisation receivers (till mid March 2009)
Eight single pixel receivers A,B,C,D are installed in the 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. Test report of 2004, Test spectra
- Noise increasing with frequency