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Posted by John Woodgate on April 10, 2005, 11:57 am
Please log in for more thread options I read in sci.electronics.design that snbaer@msn.com wrote (in design', on Sat, 9 Apr 2005: Any design work that I do contracts for (normally) EIGHT units: One Engineering model, that may not be mechanically to drawings; One prototype, that is to drawings apart from a list of agreed deviations (e.g. moulded parts won't be available); Six pre-production samples, ***made and tested by the client from parts approved by me (so no purchasing the cheapest trash)***, so I can see that they are competent to make and test, and to show that the design is manufacturable. Things CAN still go wrong after that, but then they can go wrong after 10 000 units have been built. For example, a manufacturer may 'improve' an IC out of all recognition. (8-O( -- Regards, John Woodgate, OOO - Own Opinions Only. There are two sides to every question, except 'What is a Moebius strip?' http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk | ||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Ken Taylor on April 10, 2005, 9:07 pm
Please log in for more thread options > I am tasked with evaluating the feasablility of having an
> upconverter designed. The requirements are not clear yet, but the > design will probably need to convert a 10-100 mhz sinewave to some L > band frequency. The output will need to be gated on with an externally > supplied signal that has programmable output amplitude, and will > support most 'positive-logic' families. The gate signal will be 50ns to > 1mS. The IF input will be CW and linear-sweep type waveforms. > We are open to suggestions concerning off-the-shelf type > solutions, as well as custom design. > Also, we have been bitten in the past by 'out-of-house' designs > that just don't seem to work as advertised. Any suggestions? Is there > such a thing as a contract based upon a working prototype? Am I > dreaming, or is there a way to guarantee a contractor or consultant > delivers as promised? > You could look at Miteq for upconverters. Not sure what you're on about with the gate signal with programmable output amplitude (what's that doing to the upconverter output?). Anyway Miteq have L-band stuff, have a hunt. Ken | ||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Mac on April 11, 2005, 6:55 am
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On Sat, 09 Apr 2005 16:11:49 -0700, snbaer wrote: > I am tasked with evaluating the feasablility of having an
> upconverter designed. The requirements are not clear yet, but the > design will probably need to convert a 10-100 mhz sinewave to some L > band frequency. The output will need to be gated on with an externally > supplied signal that has programmable output amplitude, and will > support most 'positive-logic' families. The gate signal will be 50ns to > 1mS. The IF input will be CW and linear-sweep type waveforms. > We are open to suggestions concerning off-the-shelf type > solutions, as well as custom design. > Also, we have been bitten in the past by 'out-of-house' designs > that just don't seem to work as advertised. Any suggestions? Is there > such a thing as a contract based upon a working prototype? Am I > dreaming, or is there a way to guarantee a contractor or consultant > delivers as promised? This is a strange post. Are you trying to figure out whether the technical spec's can be met or whether there is a methodology for finding good consultants? From what you've said, the technical spec's don't sound problematic. I am aware of systems which very closely resemble what you describe. One point I'm not too sure about is whether you want the consultant to design the external gating signal, or just accept it. Either way, this part is easy, and could be done with an off-the-shelf RF switch which just takes a TTL input to control the switching. --Mac | ||||||||||||||||||||||||||||||||||||||||||||||
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Posted by on April 11, 2005, 10:20 am
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Mac, My post was not very clear. Let me try to clarify. The post was intended to as questions about two areas: (1) electronic design, and (2) business and legal arrangements. As I am new to this area I am trying to get some advice on both. (1) The electronic design would have to convert a programmable output of 10 MHz to 100 MHz to L band frequencies ( 1 GHz to 2 GHz ). The programmable output design is done - we do not have engineers that can handle the up-conversion part of the design. Also, there is a need to gate the L band output with about 1 ns resolution. The gate signal design that will be supplied to the L band output section is done - it is a digital signal with output levels programmable from 0 V to 5 V. (2) The business and legal concerns are about ways to ensure that the result of our business arrangement is working hardware. | ||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Joerg on April 11, 2005, 11:35 pm
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Hello Steve, > (1) The electronic design would have to convert a programmable output
> of 10 MHz to 100 MHz to L band frequencies ( 1 GHz to 2 GHz ). The > programmable output design is done - we do not have engineers that can > handle the up-conversion part of the design. Also, there is a need to > gate the L band output with about 1 ns resolution. The gate signal > design that will be supplied to the L band output section is done - it > is a digital signal with output levels programmable from 0 V to 5 V. What a consultant would have to know are details such as: - Precision, stability of output frequency? - Desired sideband rejection? - Output signal level (dBm)? - Output range freely programmable? If yes, in what steps? - Required gating spectral purity? - EMC concerns (for example if 2.4GHz or 5GHz gear is nearby)? - Production cost budget? Up-conversion in itself isn't such a big deal but probably something has to control the exact frequency range where you want to see your 10-100MHz signal converted to. The frequency stability of the oscillator will to a large extent determine the effort. Also, unless you can completely forego sideband rejection this scenario may require several conversions or at least I-Q techniques. There is a lot of other stuff that needs to be known but which would have to be dealt with outside a public forum. A good consultant will always ask if a spec isn't complete. At an early stage of a concept that would be quite normal. > (2) The business and legal concerns are about ways to ensure that the
> result of our business arrangement is working hardware. Usually that's no problem but it might help if you talk this over with someone who has done business with consultants before and whom you trust. It can also be someone with such experience from another technical discipline, like mechanical engineering. Regards, Joerg http://www.analogconsultants.com | ||||||||||||||||||||||||||||||||||||||||||||||
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>I dreaming, or is there a way to guarantee a contractor or consultant
>delivers as promised?