The schematic screenshot was empty,so here once more.
P.S.The values in the smith chart plot from yesterday were correct anyway.
73
Clemens
DL4RAJ
>-----Original Message-----
>From: [email protected]
>[mailto:[email protected]] On Behalf Of Clemens Paul
>Sent: Sunday, October 18, 2015 11:11 AM
>To: [email protected]
>Subject: LF: RE: RE: TX Toroid Material ->Correction
>
>Hello Ken,
>
>I have mixed up input and output.
>So the correct values are 1.1mH **next to the tubes** and
>201µH **next to the 50 Ohm load**.
>C stays the same.
>See RFsim screenshots.
>
>Sorry for the inconvenience.
>
>73
>Clemens
>DL4RAJ
>
>>-----Original Message-----
>>From: [email protected]
>>[mailto:[email protected]] On Behalf Of Clemens Paul
>>Sent: Saturday, October 17, 2015 6:49 PM
>>To: [email protected]
>>Subject: LF: RE: TX Toroid Material
>>
>>Hi Ken,
>>
>>I believe two of your component values are off.
>>I calculate 201µH for the L next to the tubes,625pF for the
>>shunt C and 1.1mH for the second L .
>>For the 201µH L I would use iron powder (Amidon #2), for the
>>1.1mH #43 ferrite.
>>Use the mini toroid calculator to find the appropiate size
>>regarding number of turns and
>>allowed flux with safety margin.
>>
>>73
>>Clemens
>>DL4RAJ
>>
>>
>>
>>>-----Original Message-----
>>>From: [email protected]
>>>[mailto:[email protected]] On Behalf Of Ken
>>>Sent: Saturday, October 17, 2015 5:41 PM
>>>To: [email protected]
>>>Subject: LF: TX Toroid Material
>>>
>>>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
>>>
>>>
>>>
>>>
>>
>>
>
T-LowPass_475k_schematic.gif
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