Some detailed pictures of the instrument
Thermocouple details
RF connectors at the bottom side
Back side with manufacturer and probably date. Week 11th 1956 ??
Here is a video showing a similar device. With complete explanations and descriptions
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 ;-)
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)
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 ?
