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Date: Sun, 25 Jul 2010 19:20:26 +0100
Message-ID: <AANLkTi=pvQvs7KpcgN_NbGyo4rY5hkw8MX7oyGdX5ACk@mail.gmail.com>
From: Gary - G4WGT <g4wgt@tiscali.co.uk>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: 136kHz LPF toroids?
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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 <rogerlapthorn@gmail.com> 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
>
> --
> 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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Hi Roger,<div><br></div><div>I am using T157-2 (54uH - 59 turns - 0.8mm wi=
re - up to 300watts) in my LPF for 136kHz band, you could use the same typ=
e material but a smaller size toroid &amp; wire.</div><div><br></div><div>
I hope that helps.</div><div><br></div><div>Gary - G4WGT.</div><div><br><b=
r><div class=3D"gmail_quote">On 25 July 2010 18:58, Roger Lapthorn <span=
 dir=3D"ltr">&lt;<a href=3D"mailto:rogerlapthorn@gmail.com">rogerlapthorn@=
gmail.com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1=
px #ccc solid;padding-left:1ex;">Some advice please.... <br><ol><li>I&#39;=
m about to construct a 136kHz transverter with an output power up to 20W.=
 What&#39;s the best choice of <b>toroid</b> for the TX output low pass fi=
lter inductors for this sort of power level?=A0 Around 54uH is required an=
d this is rather too much for a T50 (red) toroid that I used on 500kHz. I=
 don&#39;t want anything too physically large if I can avoid it. </li>

<li>Also, are there any readily available canned inductors (or toroids) su=
itable for use as the input tuned circuit on RX? Something like the KANK33=
33 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=3D"a=
ll"><font color=3D"#888888"><br>-- <br><a href=3D"http://g3xbm-qrp.blogspo=
t.com/" target=3D"_blank">http://g3xbm-qrp.blogspot.com/</a><br><a href=3D=
"http://www.g3xbm.co.uk" target=3D"_blank">http://www.g3xbm.co.uk</a><br>

<a href=3D"http://www.youtube.com/user/g3xbm" target=3D"_blank">http://www=
.youtube.com/user/g3xbm</a><br>G3XBM=A0 =A0 GQRP 1678=A0 =A0 =A0 ISWL G110=
88<br>
</font></blockquote></div><br></div>

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