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Re: LF: Re: Vintage RF current meter

To: "[email protected]" <rsgb_lf_grou[email protected]>
Subject: Re: LF: Re: Vintage RF current meter
From: Rik Strobbe <[email protected]>
Date: Wed, 4 May 2016 16:25:28 +0000
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Thread-topic: LF: Re: Vintage RF current meter

Hi Luis,

 

a single transformer, as suggested by Alan, will do the job.

 

73, Rik  ON7YD - OR7T

 


Van: [email protected] <[email protected]> namens VIGILANT Luis Fernández <[email protected]>
Verzonden: woensdag 4 mei 2016 17:37
Aan: [email protected]
Onderwerp: RE: LF: Re: Vintage RF current meter
 
Thank you for the comments Rik, Alan, Stefan
 
The idea of external transformers seems better than digging inside this venerable instrument. And permits an easy two scale configuration
If a single transformer can do, will mean less looses. Right ?
 
Will open it and make some pictures to show you anyway
 
Stefan. Don't blame me if I call you .....Lord of Rings  :-)))))
 
Hope it really help you to run more current on your wire. But beware of the power of the ring ;-)
 
73 de Luis
EA5DOM


De: [email protected] [mailto:[email protected]] En nombre de DK7FC
Enviado el: miércoles, 04 de mayo de 2016 15:15
Para: [email protected]
Asunto: Re: LF: Re: Vintage RF current meter

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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