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Author Topic: A salvaged RF Ammeter  (Read 1804 times)
VU2NAN
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Posts: 248




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« on: May 13, 2012, 11:29:53 AM »

Please do click on the link below.

http://nandustips.blogspot.in/2012/05/salvaged-rf-ammeter.html

73

Nandu.
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G3RZP
Member

Posts: 4625




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« Reply #1 on: May 13, 2012, 12:19:30 PM »

It's always said that you can calibrate a thermo-ammeter on DC. There is some inaccuracy caused by skin effect being greater at HF, but it's not generally enough to worry about for amateur purposes.

The big problem with thermo-ammeters is that they are rather delicate, and don't take kindly to overloads. They are repairable - Ray, VK2NO wrote an article about doing this for Issue 13 of 'Signal', the magazine of the Vintage and Military Amateur Radio Society.
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VU2NAN
Member

Posts: 248




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« Reply #2 on: May 13, 2012, 11:22:12 PM »

Hi OM Peter,

Many thanks for the info.

I went through OM Ray's article and admire his tenacity!

73

Nandu.
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G3RZP
Member

Posts: 4625




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« Reply #3 on: May 14, 2012, 05:40:39 AM »

Nandu,

Me too!

73

Peter
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