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Re: LF: 136kHz LPF toroids?

from [Gary - G4WGT] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: 136kHz LPF toroids?
From: Gary - G4WGT <[email protected]>
Date: Sun, 25 Jul 2010 19:20:26 +0100
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Hi Roger,

I am using T157-2 (54uH - 59 turns - 0.8mm wire - up to 300watts) in my LPF for 136kHz band, you could use the same type material but a smaller size toroid & wire.

I hope that helps.

Gary - G4WGT.


On 25 July 2010 18:58, Roger Lapthorn <[email protected]> wrote:
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

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