Re: New station on VLF: DK1IS

[DK1IS <DK1IS@kabelmail.de>]

Hi Luis,

the part number of the Murata inductors 10 mH/0.6 A (DC) in use here is 1410606C, see https://www.murata-ps.com/en/1410606c.html. There you can also get a pdf-summary of all available inductors of this family. They even offer higher inductances up to 22 mH, but I suppose using them you´ll get voltage and current problems. 10 mH seems to be a good compromise: you don´t need too much of them and at 8270 Hz / 600 mA there are about 320 V rms per inductor. Up to now they withstand and the stationary surface temperatur reaches 52 °C (at the end of a warm winter ;-)).
For test samples the usual european mail order companies are OK, but for larger numbers one should search for cheaper offers. My final source was Mouser, they deliver from Texas. But it took 4 months to get all the 60 inductors in three batches ...
Sorry to say this loading coil concept is rather expensive: the material bill for the inductors, the ply wood rings, the connectors and all the polyamide stuff finally added up to about € 400 - but it has been a nice project anyway and the only one fitting in my frame conditions.

73,
Tom, DK1IS

Am 05.02.2018 um 10:23 schrieb VIGILANT Luis Fernández:

Hi Tom, VLF

 

Thank you VERY MUCH for the detailed description of your Dream Tx for 36Km band

Different approach and neat construction. Congratulations ! J

 

Can you provide a part number for the Murata ferrite inductors?

 

73 de Luis

EA5DOM