From: "Ken" <ken.h.wright@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
Date: Sat, 17 Oct 2015 16:41:03 +0100
Message-ID: <08B5A81DD2D14C84874DD10EEB145569@lindavideo>
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Subject: LF: TX Toroid Material
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Dear All. I am having problems with the choice of material for the output
network of the 475kHz Valve TX. The network is an L - C - L, 'T' network
with an input impedance of 2100 ohms and a load of 50 ohms, for this
configuration the input L is 7.7mH, shunt capacitance is 117pf, and output L
is 1.1mH. The PA design using a 6146 low power or 813 high power work fine
when simulated using LT spice IV. When testing in the real world using the
6146 there is in excess of 800v rms rf on the network side of the anode
coupling capacitor, but nothing after the input L. I can only conclude that
I using the wrong type material for the toroids, I used the largest size
(unmarked) toroid which gave me a modest number of turns. I have checked the
Amidon tables and Iron Powder because of the low AL values, which leaves
Ferrite, which mix would you recommend? The simulations give me output
powers 90W for the 6146, and 300W for the 813. I would be grateful for any
core material advice .

 
Ken Wright.

M0KHW

 
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<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
lang=3DEN-GB
style=3D'font-size:12.0pt'>Dear All. I am having problems with the =
choice of
material for the output network of the 475kHz <st1:place =
w:st=3D"on"><st1:City
 w:st=3D"on">Valve</st1:City> <st1:State =
w:st=3D"on">TX</st1:State></st1:place>.
The network is an L &#8211; C &#8211; L, &#8216;T&#8217; network with an =
input
impedance of 2100 ohms and a load of 50 ohms, for this configuration the =
input
L is 7.7mH, shunt capacitance is 117pf, and output L is 1.1mH. The PA =
design
using a 6146 low power or 813 high power work fine when simulated using =
LT
spice IV. When testing in the real world using the 6146 there is in =
excess of
800v rms rf on the network side of the anode coupling capacitor, but =
nothing
after the input L. I can only conclude that I using the wrong type =
material for
the toroids, I used the largest size (unmarked) toroid which gave me a =
modest
number of turns. I have checked the Amidon tables and Iron Powder =
because of
the low <st1:place w:st=3D"on"><st1:State =
w:st=3D"on">A<sub>L</sub></st1:State></st1:place>
values, which leaves Ferrite, which mix would you recommend? The =
simulations
give me output powers 90W for the 6146, and 300W for the 813. I would be
grateful for any core material advice .<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
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<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
lang=3DEN-GB
style=3D'font-size:12.0pt'>Ken Wright.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
lang=3DEN-GB
style=3D'font-size:12.0pt'>M0KHW<o:p></o:p></span></font></p>

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