It’s a great idea for folks like me who don’t have a NEC4 license! It’s not
very hard to implement, just use a queue (such as RabbitMQ, Active MQ or AWS
SQS) to accept and distribute jobs, and use a web page to upload files and send
jobs to the queue, the server listens on the queue, and do the computation,
send an email to the user or let the user fetch the results with an ID obtained
when submitting the file. At work, I have wrote a few these applications for
cancer researchers. The only issue is the NEC4 license, does it allow these
kind of “sharing”?
Regards,
Ming N2IW
> On Nov 9, 2019, at 6:41 PM, jimlux <jimlux@earthlink.net> wrote:
>
>> On 11/9/19 12:04 PM, David Gilbert wrote:
>> I think that's a fine idea, Jim, assuming that the license allows it. I
>> wouldn't need it very often, but there are times when I'd like better
>> confidence in a model that has closely spaced wires or wires near (or under)
>> ground. It would even be cool to run a simple dipole model to compare with
>> a real antenna to see where actual RF ground might be on this mostly dry
>> rocky hillside.
>
> I've spent the last few months doing this kind of thing modeling dipoles of
> various lengths from 1 meter to 1 km and at various frequencies from 10kHz to
> 100 MHz against the lunar surface at various distances above and below the
> surface. The fact that things like impedance vary smoothly with parameter
> variations is what gives confidence that the numbers are right.
>
>
>
>
>> I'm not sure how difficult it would be to implement, but it might be a good
>> idea to require an individual subscription of sorts with a userid/password
>> to be able to control potential abusers. Or maybe that could be
>> accomplished more simply with limits on compute time, frequency of use, and
>> number of elements.
>
> Yeah, I'll have to contact Joe NA3T and Mark WM7D who have the AZ_PROJ site
> to see what they have to say.
>
> I'm sure there's some standard anti DDOS/hack stuff.
>
>
>
>> 73,
>> Dave AB7E
>>> On 11/9/2019 11:34 AM, jimlux wrote:
>>> I've been thinking about putting up a server that would run NEC4.2 on user
>>> submitted decks - The idea is you would upload your input deck, and then,
>>> sometime later, your output would be there to download. Single run at a
>>> time, some sort of queuing system, some sort of "maximum run time". After
>>> some period of time, your output file would disappear (depends on how much
>>> disk space I have)
>>>
>>> (Just for context, I've been running a bunch of jobs recently for a variety
>>> of designs with >600 segments, the GN3 Sommerfeld-Norton ground, and run
>>> times are about 5 seconds per frequency)
>>>
>>> It would be free, as an experiment. Sort of like the servers that will
>>> produce a aziumuthal map centered at a user entered location.
>>>
>>> The idea is that you can run your NEC2 jobs, and then, after iterating, and
>>> you want to verify against the higher quality modeling that NEC4 provides,
>>> you could do that.
>>>
>>> Or, if your job is simple enough and runs fast enough, you could iterate a
>>> design that has buried wires, etc.
>>>
>>> I do need to look into the NEC4 license agreement to make sure it's
>>> permitted. There's no export control issue - the executable (and source)
>>> are export controlled (EAR, not ITAR), but input and output data is not.
>>>
>>>
>>> I'm looking for feedback on the idea - any interest in it?
>>> Any suggestions on implementation or features?
>>>
>>>
>>> Jim, W6RMK
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>>>
>>>
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