Message-ID: <4C4C80EA.5090908@iup.uni-heidelberg.de>
Date: Sun, 25 Jul 2010 20:22:34 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <schaefer@iup.uni-heidelberg.de>
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To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: 136kHz LPF toroids?
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Roger, you can use a T50-2 for this. There are some types that are more 
suited for that frequency range but sometimes difficult to get.

I am using the T130-2 for 120W and the T200-2 for the 1kW PA with best 
results.

73, Stefan/DK7FC

Am 25.07.2010 19:58, schrieb Roger Lapthorn:
> Some advice please....
>
>    1. I'm about to construct a 136kHz transverter with an output power
>       up to 20W. What's the best choice of *toroid* for the TX output
>       low pass filter inductors for this sort of power level?  Around
>       54uH is required and this is rather too much for a T50 (red)
>       toroid that I used on 500kHz. I don't want anything too
>       physically large if I can avoid it.
>    2. Also, are there any readily available canned inductors (or
>       toroids) suitable for use as the input tuned circuit on RX?
>       Something like the KANK3333 inductors from Toko? Again, nothing
>       too big unless this is a necessity for large signal handling.
>
> Thanks in advance for inputs.
>
> 73s
> Roger G3XBM
>
> -- 
> http://g3xbm-qrp.blogspot.com/
> http://www.g3xbm.co.uk
> http://www.youtube.com/user/g3xbm
> G3XBM    GQRP 1678      ISWL G11088

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Roger, you can use a T50-2 for this. There are some types that are more
suited for that frequency range but sometimes difficult to get.<br>
<br>
I am using the T130-2 for 120W and the T200-2 for the 1kW PA with best
results.<br>
<br>
73, Stefan/DK7FC<br>
<br>
Am 25.07.2010 19:58, schrieb Roger Lapthorn:
<blockquote   cite="mid:AANLkTi=PPPe=fpfM6S+TVYTv-U-u_LAX2dRzj1Yf=Voi@mail.gmail.com"   type="cite">Some advice please.... <br>
  <ol>
    <li>I'm about to construct a 136kHz transverter with an output
power up to 20W. What's the best choice of <b>toroid</b> for the TX
output low pass filter inductors for this sort of power level?&nbsp; Around
54uH is required and this is rather too much for a T50 (red) toroid
that I used on 500kHz. I don't want anything too physically large if I
can avoid it. </li>
    <li>Also, are there any readily available canned inductors (or
toroids) suitable for use as the input tuned circuit on RX? Something
like the KANK3333 inductors from Toko? Again, nothing too big unless
this is a necessity for large signal handling.</li>
  </ol>
Thanks in advance for inputs.<br>
  <br>
73s<br>
Roger G3XBM<br clear="all">
  <br>
-- <br>
  <a moz-do-not-send="true" href="http://g3xbm-qrp.blogspot.com/">http://g3xbm-qrp.blogspot.com/</a><br>
  <a moz-do-not-send="true" href="http://www.g3xbm.co.uk">http://www.g3xbm.co.uk</a><br>
  <a moz-do-not-send="true" href="http://www.youtube.com/user/g3xbm">http://www.youtube.com/user/g3xbm</a><br>
G3XBM&nbsp; &nbsp; GQRP 1678&nbsp; &nbsp; &nbsp; ISWL G11088<br>
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