UR5FFR

Радиолюбительские конструкции и программы
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PostPosted: 13 Aug 2020, 20:19 
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В сети распространено мнение что материал 2 можно использовать только до 10МГц. Оказывается это не так - производитель заявляет о максимальной частоте в 45МГц (пруф).

Attachment:
Micrometals.png
Micrometals.png [ 73.63 KiB | Viewed 488 times ]


Я имею этому хорошее подтверждение - в ФНЧ усилителя на 14МГц сильно грелись китайские желтые кольца из 6го материала. Кольца оказались с большими потерями. Из 6го материала были только мелкого диаметра поэтому перемотал на кольцах из 2го материала и все заработало без нагрева и потерь.


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PostPosted: 14 Aug 2020, 00:14 
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Relayer wrote:
В сети распространено мнение что материал 2 можно использовать только до 10МГц. Оказывается это не так - производитель заявляет о максимальной частоте в 45МГц


http://www.amidoncorp.com/product_image ... s/1-08.pdf

MAc
mrn


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PostPosted: 14 Aug 2020, 07:43 
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В этом pdf утверждается что материал 6 нельзя применять при частотах меньше 10 МГц. На мой взгляд это очень спорно. Я не доверяю этой информации


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PostPosted: 15 Aug 2020, 02:03 
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Relayer wrote:
В этом pdf утверждается что материал 6 нельзя применять при частотах меньше 10 МГц. На мой взгляд это очень спорно. Я не доверяю этой информации


Not exactly.
You can not treat this kind of graph as sharp "from point to point". Look at http://www.amidoncorp.com/product_image ... s/1-18.pdf
Exactly for t37-2 and t37-6 with 40 turns. It's similar inductance and Quality factor of "6" material is a bit better for higher frequencies. But maxQ for "2" is abt 4MHz and for "6" abt 6MHz.
You are ABSOLUTELY right, that legend says - do not use "6" below 10MHz ant that is not true. But in real "6" material is a little better on higher frequencies then "2"
only a little.
"Not for use" is of course not accepted.
Full listing of Amidon's pdf is here. http://www.amidoncorp.com/specs/

Best 73
MAc
9mrn

Do You plan compare parameters of raisin, raisin dx and raisin dx2?


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PostPosted: 15 Aug 2020, 12:29 
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sp9mrn wrote:
Do You plan compare parameters of raisin, raisin dx and raisin dx2?

Its simple: good, better, best :)


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PostPosted: 16 Aug 2020, 13:18 
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;-)
Thanks.
Returning to toroids - did you see that? https://groups.io/g/ucx/message/2039

73
MAc


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PostPosted: 16 Aug 2020, 21:00 
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Thanks, this is interesting. I'm copy it here

Manuel; DL2MAN wrote:
I did a high resolution calibration with 5500 Points per Sweep between 1-50MHz. Every 9,9khz I have a calibration Point and a measurement point (averaged: every point measured 5x, the 2 points with biggest deviation get kicked and the remaining 3 get averaged).
Now 1 full sweep (for calibration and for measurement) takes about 10 Minutes....
As you can see below: The higher the Q gets, the more uncertainty is involved. But as before: All 3 curves were aquired with the same setup and settings, and the trend (for comparison) should be very clear.


High Resoultion Plot of Micrometals T37-2 (red):
Attachment:
InkedHighRes-1-50-T37-2_LI.jpg
InkedHighRes-1-50-T37-2_LI.jpg [ 96.97 KiB | Viewed 400 times ]

High Resolution Plot of Micrometals T37-6:
Attachment:
InkedHighRes-1-50-T37-6_LI.jpg
InkedHighRes-1-50-T37-6_LI.jpg [ 130.83 KiB | Viewed 400 times ]

And just for comparison and to underline my initial statement to avoid cheap chinese Toroids: High Resolution plot of Chinese 37-6 (Yellow) Toroid:
Attachment:
HighRes-1-50-chinese37-6.png
HighRes-1-50-chinese37-6.png [ 20.29 KiB | Viewed 400 times ]

Quote:
Conclusion:
For 160m - 60m T37-2 is superior to T37-6
For 40m, they are equally usable
For 30m and higher T37-6 is superior to T37-2
And never ever use chinese Toroids exept for dummy loads ;)

73 Manuel; DL2MAN


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