Re: LF: TXing on VLF again, Iron powder cores... broomstick coil?

[Markus Vester <markusvester@aol.com>]

Peter, thanks for that. Scaling AL and height indicates µr ~ 700 which probably means ferrite material. With a one meter stack of those cores it would be easy to reach the desired inductance, but flux density and achievable voltage might be limited by saturation and hysteresis losses. I will take a look when the cores arrive here.

 

Best 73,

Markus (DF6NM)

 

 

PS there was a minor error in mycalculation of the µd term: 1 m^2 / 4cm^2 = 2500, not 5000.

-----Ursprüngliche Mitteilung-----
Von: Peter <pws@df3lp.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Di, 19 Apr 2016 4:48 pm
Betreff: Re: LF: TXing on VLF again, Iron powder cores... broomstick coil?

Hi Markus et al. 

  

 On 17.04.2016 13:56, Markus Vester wrote: 

 > ... 

 > Anyway I have ordered some cores to make measurements, and also some of the 

 > red double-height ferrite (?) sleeves from the same supplier. 

  

 Measured both at 10kHz. 

  

 Toroids, green/blue : 91 nH/n² 

 Sleeves, red : 4406 nH/n² 

  

 73 de df3lp, 

 Peter