This page tells you how we are getting on with production of the COBRA backend.
It will give you an idea of the extent of the work required, and how much is left to do.
Phase 1 of the project as agreed on Friday 19th April 2002 is to provide enough instruments by September 2002, to record a band 50MHz wide, split into bands of 5MHz, and sampled at quadrature baseband at a rate of 5MSPS. This will require 10 Sampler Boards, 10 LED Display Boards, 10 Interface Boards, 10 LO modules, and three backplane boards mounted into three chassis. In addition, there will be 20 passband filters, and 40 low-pass filters. | |
Phase 2 of the project will increase this capacity by a further six sets of sampler, interface, and LO modules. This will allow us to observe a band up to 80MHz. | |
Phase 2 of the project will depend on the success or otherwise of Phase 1. Also we are constantly looking at the available technology, in particular, ways of getting data onto the PCI bus. At the moment we are using Adlink boards (PCI-7300A) which use 16-bit, 33MHz technology. We are waiting for affordable 32-bit 66MHz technology, which will revolutionise our data capture methods. | |
I set up an experiment with two Samplers, which feed data into two Interface boards, and thence two Adlink PCI Boards. This allowed us to to run two systems in parallel so we could test the repeatability of the hardware. This also gives the scientists opportunity to test the scalability of their software. | |
On 25th June we successfully ran the experiment using two samplers in parallel. We observed B0329+54 using the 42ft telescope. The result was very encouraging. Nice clear pulse booming in. Visually, at least, it was very difficult to distinguish any variance between the two systems. A more in depth comparison will be made soon. This is quite a simple experiment, and does not implement any scalability software. We just wanted to be sure that the two independent machines produced similar data. |
This chart correct at 10/09/2002 |
I am currently building two backplanes. These will be fitted into crates prior to being installed into the rack. |
Board Type | Serial Number | Components Available | Assembled | Tested | Installed |
---|---|---|---|---|---|
SAMPLER | 001 | ||||
SAMPLER | 002 | ||||
SAMPLER | 003 | ||||
SAMPLER | 004 | ||||
SAMPLER | 005 | ||||
SAMPLER | 006 | ||||
SAMPLER | 007 | ||||
SAMPLER | 008 | ||||
SAMPLER | 009 | ||||
SAMPLER | 010 |
Board Type | Serial Number | Components Available | Assembled | Tested | Installed |
---|---|---|---|---|---|
LED DISPLAY | 001 | ||||
LED DISPLAY | 002 | ||||
LED DISPLAY | 003 | ||||
LED DISPLAY | 004 | ||||
LED DISPLAY | 005 | ||||
LED DISPLAY | 006 | ||||
LED DISPLAY | 007 | ||||
LED DISPLAY | 008 | ||||
LED DISPLAY | 009 | ||||
LED DISPLAY | 010 |
Board Type | Serial Number | Components Available | Assembled | Tested | Installed |
---|---|---|---|---|---|
INTERFACE | 001 | ||||
INTERFACE | 002 | ||||
INTERFACE | 003 | ||||
INTERFACE | 004 | ||||
INTERFACE | 005 | ||||
INTERFACE | 006 | ||||
INTERFACE | 007 | ||||
INTERFACE | 008 | ||||
INTERFACE | 009 | ||||
INTERFACE | 010 |
Board Type | Serial Number | Components Available | Assembled | Tested | Installed |
---|---|---|---|---|---|
LO MODULE | 001 | ||||
LO MODULE | 002 | ||||
LO MODULE | 003 | ||||
LO MODULE | 004 | ||||
LO MODULE | 005 | ||||
LO MODULE | 006 | ||||
LO MODULE | 007 | ||||
LO MODULE | 008 | ||||
LO MODULE | 009 | ||||
LO MODULE | 010 |
Board Type | Serial Number | Components Available | Assembled | Tested | Installed |
---|---|---|---|---|---|
BACKPLANE | 001 | ||||
BACKPLANE | 002 | ||||
BACKPLANE | 003 |
Board Type | Serial Number | Components Available | Assembled | Tested | Installed |
---|---|---|---|---|---|
FILTER/PB | 001 | ||||
FILTER/PB | 002 | ||||
FILTER/PB | 003 | ||||
FILTER/PB | 004 | ||||
FILTER/PB | 005 | ||||
FILTER/PB | 006 | ||||
FILTER/PB | 007 | ||||
FILTER/PB | 008 | ||||
FILTER/PB | 009 | ||||
FILTER/PB | 010 | ||||
FILTER/PB | 011 | ||||
FILTER/PB | 012 | ||||
FILTER/PB | 013 | ||||
FILTER/PB | 014 | ||||
FILTER/PB | 015 | ||||
FILTER/PB | 016 | ||||
FILTER/PB | 017 | ||||
FILTER/PB | 018 | ||||
FILTER/PB | 019 | ||||
FILTER/PB | 020 |
Board Type | Serial Number | Components Available | Assembled | Tested | Installed |
---|---|---|---|---|---|
FILTER/LP | 001 | ||||
FILTER/LP | 002 | ||||
FILTER/LP | 003 | ||||
FILTER/LP | 004 | ||||
FILTER/LP | 005 | ||||
FILTER/LP | 006 | ||||
FILTER/LP | 007 | ||||
FILTER/LP | 008 | ||||
FILTER/LP | 009 | ||||
FILTER/LP | 010 | ||||
FILTER/LP | 011 | ||||
FILTER/LP | 012 | ||||
FILTER/LP | 013 | ||||
FILTER/LP | 014 | ||||
FILTER/LP | 015 | ||||
FILTER/LP | 016 | ||||
FILTER/LP | 017 | ||||
FILTER/LP | 018 | ||||
FILTER/LP | 019 | ||||
FILTER/LP | 020 | ||||
FILTER/LP | 021 | ||||
FILTER/LP | 022 | ||||
FILTER/LP | 023 | ||||
FILTER/LP | 024 | ||||
FILTER/LP | 025 | ||||
FILTER/LP | 026 | ||||
FILTER/LP | 027 | ||||
FILTER/LP | 028 | ||||
FILTER/LP | 029 | ||||
FILTER/LP | 030 | ||||
FILTER/LP | 031 | ||||
FILTER/LP | 032 | ||||
FILTER/LP | 033 | ||||
FILTER/LP | 034 | ||||
FILTER/LP | 035 | ||||
FILTER/LP | 036 | ||||
FILTER/LP | 037 | ||||
FILTER/LP | 038 | ||||
FILTER/LP | 039 | ||||
FILTER/LP | 040 |