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Author Topic: Avoiding intermod products based on anticipated strength?  (Read 3282 times)

Russell Ault

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Re: Avoiding intermod products based on anticipated strength?
« Reply #20 on: May 08, 2018, 01:20:13 pm »

Here is a link for an Excel Spreadsheet I made that calculates 2T30, 2T50, and 3T30 IMDs for up to 16 device frequencies. A little late but I hope this is useful to you.

That's hugely useful. In addition to calculating guard bands, it's also a great learning tool, just being able to throw in frequencies and see what happens. Thanks!

-Russ
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Paul McDermott

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Re: Avoiding intermod products based on anticipated strength?
« Reply #21 on: May 08, 2018, 04:02:44 pm »

That's hugely useful. In addition to calculating guard bands, it's also a great learning tool, just being able to throw in frequencies and see what happens. Thanks!

-Russ


Great to hear that you found it useful. I also use it to reverse engineer the acceptance criteria for device and software frequency coordination.

Feel free to contact me with suggestions to make it more useful.

http://rfcoordinationnyc.com/downloads.html
« Last Edit: August 09, 2019, 12:26:07 pm by Paul McDermott »
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Paul McDermott
937-478-5685
thunderpaul@me.com
http://rfcoordinationnyc.com

Russell Ault

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Re: Avoiding intermod products based on anticipated strength?
« Reply #22 on: May 08, 2018, 05:18:30 pm »

I also use it to reverse engineer the acceptance criteria for device and software frequency coordination.

Do you mind sharing your procedure for this? It sounds like a very useful process.

Thanks!

-Russ
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Paul McDermott

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Re: Avoiding intermod products based on anticipated strength?
« Reply #23 on: May 08, 2018, 06:26:41 pm »

Do you mind sharing your procedure for this? It sounds like a very useful process.

Thanks!

-Russ


For example paste all 16 of the frequencies of UHF-R H band Group 1

you can change the acceptance criteria for channel spacing and IMD spacing to find out the parameters they used to calculate the groups.

For this example Channel spacing was 399KHz and 2T3O was 199KHz
2T5O and 3T3O and not calculated for these groups

I don't get too in-depth with this, but I like to be aware of how these calculations are made so when I see a problem in the field I have some facts to work with.

One more reason to always use coordination software and not use magic buttons on devices.
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Paul McDermott
937-478-5685
thunderpaul@me.com
http://rfcoordinationnyc.com

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Re: Avoiding intermod products based on anticipated strength?
« Reply #23 on: May 08, 2018, 06:26:41 pm »


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