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Re: LF: Re: Vintage RF current meter

To: [email protected]
Subject: Re: LF: Re: Vintage RF current meter
From: DK7FC <[email protected]>
Date: Wed, 04 May 2016 15:15:24 +0200
In-reply-to: <[email protected]>
References: <[email protected]cal> <[email protected]>
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Hi Rik,

A nice drawing, remindes me to the early times of the internet and before ;-)

As Alan suggested, what about a single core working as a current transformer?

BTW ferrite cores, i have got my package a few minutes ago 100x 3C85 cores for VLF. The show can go on! See https://dl.dropboxusercontent.com/u/19882028/VLF/20160504_144923.jpg Looks like goodies ;-)

73, Stefan

Am 04.05.2016 11:24, schrieb Rik Strobbe:

Hello Luis,

 

one way to change the range without opening meter is to use two 4/1 radio transformers:

- first transformer high side to the TX, and low side to one and of the meter

- second transformer low side to the other end of the meter and high side to the antenna

Drawback: the transformers will introduce some additional loss

 

  -----                  -----

       }|    Meter     |{

       }|     +--+     |{       

TX     }| ----|  |---- |{       Antenna

       }|{    +--+    }|{

  -----   ------------   -----

 

73, Rik  ON7YD - OR7T

 

PS: drawing needs a monospace font (eg. Courier New)

 


Van: [email protected] <[email protected]> namens VIGILANT Luis Fernández <[email protected]>
Verzonden: woensdag 4 mei 2016 10:46
Aan: [email protected]
Onderwerp: LF: Vintage RF current meter
 
Hi xyF
 
Yesterday I got a nice gift from a local friend, Pascual EA5JF :-)
 
 
Unfortunately the current range under 1A looks unusable 
Still not opened to have a look. Seems to use a thermocouple. Is there any chance to make it
more sensible and usable for <1A currents ?
 
73 de Luis
EA5DOM
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