>Rich Measures wrote:
>
>>G3SEK wrote:
>
>>>1. 100nH at 100MHz is +j63.83;
>>
>>I got 62.83
>>
>Sorry for my bad t6ping when copying results off the screen: 62.83 is
>correct.
>
>>>200nH at 100MHz is +j125.66
>>>
>>ok
>>
>>>2. Now transform 100 ohms paralleled by +j63.82 transforms into its
>>>series-equivalent.
>Sri, more bad trping - read "62.83" again.
>
>>The equations (as posted last weekend) are:
>>>
>>>Rs = Rp*Xp^2 / (Rp^2 + Xp^2) Xs = Rp^2*Xp / (Rp^2 + Xp^2)
>>>
>>>Answer: 28.30 in series with +j48.05
>>I got 28.32 ohm R, however I came up with +j45.06 ohms of X {cos 57.85
>>deg. x 53.22 ohms of Z}
>>
>My typing still hasn't improved, but your method agrees with the correct
>answer to at least 3 sig figs, Rich. Let's assume it's rounding errors
>between our two calculations, and press onwards.
>
>
>>>3. Add the +j125.66 in series, to get 28.30 +j170.71 (still series-
>>>connected)
>>>
>>hello
>>
>>>4. This is now NEW NETWORK that includes the external 200nH. Transform
>>>this new network back into its parallel-equivalent:
>>>
>>It is my opinion that this is not a legal move.
>
>Why not? It's a series R-L network, same as any other.
>
>> In other words, adding
>>external X to a parallel L-R circuit does not change the Admittance (Y)
>>of the parallel circuit. In other words, it appears that you are
>>trying to add oranges and apples, Mr. White.
>>
>The original parallel circuit disappeared in step 2 when we transformed
>it into its series-equivalent. There is absolutely no bar to treating
>the series-equivalent circuit just like any other series circuit.
I do not believe it.
>
>By the way, if the move I made isn't "legal", all your pi-tanks just
>stopped working!
>
A pi-network tank is not the same thing
>--------------------------------------------
>
>>Your calculation of how the 100ohm suppressor R became 49 ohms at 10MHz
>>in Wes' measurements would interest me.
>
>That's presumably your pure-nichrome/100-ohms suppressor, which had a
>measured Rp of 49.26 ohms at 10MHz. (I'm copy-and-pasting these figures
>straight off Wes's table in your web page,
Wes' table is not in my Web page.
>to avoid any more typing
>errors.)
>
>On its own, the pure-nichrome inductor looked like 95.6nH (Lp) in
>parallel with 93.46 ohms (Rp).
Rp is 49.26 ohms. The 100 ohm suppressor R is in parallel with the
95.6nH suppressor inductor, which Wes calls Ls. 93.46 ohms is not the
resistance of the suppressor R.
>...........
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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