Hi Dick the Epcos core data is on the web but the PDF file download doesnt
work for me. See
http://www.search.epcos.com/pls/prins/para_search.init?M_SPRACHID=2
I have a number of large epcos cores but have not tried to use them yet.
As to the transformer loss....do you have enough turns ?? Do you have too
many turns. I magine ther is no DC flowing through the winding. Have you
tried stacking a couple of cores to increase the cross-section area??.
Cheers de Alan G3NYK
alan.melia (at) btinternet.com
----- Original Message -----
From: "Dick" <[email protected]>
To: <[email protected]>
Sent: 28 March 2005 16:00
Subject: LF: the use of Epcos cores on LF
A question, especially for our German members.
Epcos makes (big) cores of so called N30 material.
I previously used an 58mm core to match 50 Ohm to 135Ohm, but it got
really hot at around 400-500Watt or so.
I wonder if this is normal or not (Ui=4300)
These cores are relatively cheap, so I hoped it was a good solution for
big
(output) transformers.
Now I am not to sure anymore...........
Also interested to know if anyone has experience in using a low beverage,
let's say 400-500m long at 1m heigth as TX antenna.
Not earthed/resistor at the end, just a simple very long wire at 1m
heigth.
73
Dick, pa4vhf
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