You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
The Feb 2025 Radioddity Giveaway Results are In! Click Here to see who won!

Reply to thread

Message

Hi Marconi,

The correct formulas were generated by W4RNL and his Basic program can be found at the website with a URL of http://on5au.be/content/a10/moxon/moxgen.html. The problem I found that causes values that don't model well is as follows: The error in the KG4ZOW online calculator source code reads: $d1 = 0.4342945 / log ( $dw )
but the constant 0.4342945 should have been multiplied by log ($dw) not divided by it.

Here is a copy of the correct code from the W4RNL basic program: D1=.4342945*LOG(DW)

I was able to create my own Moxon calculator spreadsheet using the W4RNL basic program and my spreadsheet generates values exactly as the downloadable program called MoxGen, and these values model just fine in 4NEC2. If I change my spreadsheet to include the error in the KG4ZOW program mentioned above, my spreadsheet then generates values like the KG4ZOW online calculator which model poorly. Simple but critical error for those building Moxon antennas. Since finding the error I have not heard back from KG4ZOW or W4/VP9KF but hopefully they will eventually respond and correct their online calculators or remove them from the internet.

P.S. the LOG function in the above mentioned code is a natural log function, not a base 10 Log function for those wanting to create their own Moxon spreadsheet.

Take care,
Don (wd8dsb)

<blockquote data-quote="wd8dsb" data-source="post: 753755" data-attributes="member: 60288">Hi Marconi,The correct formulas were generated by W4RNL and his Basic program can be found at the website with a URL of <a href="http://on5au.be/content/a10/moxon/moxgen.html" target="_blank">http://on5au.be/content/a10/moxon/moxgen.html</a>.&nbsp; The problem I found that causes values that don&#039;t model well is as follows:&nbsp; The error in the KG4ZOW online calculator source code reads: $d1 = 0.4342945 / log ( $dw )but the constant 0.4342945 should have been multiplied by log ($dw) not divided by it.Here is a copy of the correct code from the W4RNL basic program: D1=.4342945*LOG(DW)I was able to create my own Moxon calculator spreadsheet using the W4RNL basic program and my spreadsheet generates values exactly as the downloadable program called MoxGen, and these values model just fine in 4NEC2.&nbsp; If I change my spreadsheet to include the error in the KG4ZOW program mentioned above, my spreadsheet then generates values like the KG4ZOW online calculator which model poorly.&nbsp; Simple but critical error for those building Moxon antennas.&nbsp; Since finding the error I have not heard back from KG4ZOW or W4/VP9KF but hopefully they will eventually respond and correct their online calculators or remove them from the internet.P.S. the LOG function in the above mentioned code is a natural log function, not a base 10 Log function for those wanting to create their own Moxon spreadsheet.Take care,Don (wd8dsb)</blockquote>

[QUOTE="wd8dsb, post: 753755, member: 60288"] Hi Marconi, The correct formulas were generated by W4RNL and his Basic program can be found at the website with a URL of [URL]http://on5au.be/content/a10/moxon/moxgen.html[/URL]. The problem I found that causes values that don't model well is as follows: The error in the KG4ZOW online calculator source code reads: $d1 = 0.4342945 / log ( $dw ) but the constant 0.4342945 should have been multiplied by log ($dw) not divided by it. Here is a copy of the correct code from the W4RNL basic program: [B]D1=.4342945*LOG(DW) [/B] I was able to create my own Moxon calculator spreadsheet using the W4RNL basic program and my spreadsheet generates values exactly as the downloadable program called MoxGen, and these values model just fine in 4NEC2. If I change my spreadsheet to include the error in the KG4ZOW program mentioned above, my spreadsheet then generates values like the KG4ZOW online calculator which model poorly. Simple but critical error for those building Moxon antennas. Since finding the error I have not heard back from KG4ZOW or W4/VP9KF but hopefully they will eventually respond and correct their online calculators or remove them from the internet. P.S. the LOG function in the above mentioned code is a natural log function, not a base 10 Log function for those wanting to create their own Moxon spreadsheet. Take care, Don (wd8dsb) [B] [/B] [/QUOTE]

Top Bottom