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Date: Wed, 2 Feb 2011 07:03:33 -0800 (PST)
From: Daniele Tincani <danieletincani@yahoo.com>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: Dumb homebrewer - Advice needed
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Many thanks to Petr and Marco for their replies.
I suppose=A0the same considerations apply=A0to stray capacitances? For exa=
mple,=20
connecting to=A0the 30-350pF tuning capacitor by using a twisted pair of=
=A0wires=20
(10cm long) or running the same wires=A0as=A0separate as possible=A0from=
 each other=20
has no relevance. Correct?

Best regards
Daniele



________________________________
From: Marco IK1ODO -2 <ik1odo@spin-it.com>
To: rsgb_lf_group@blacksheep.org
Sent: Wed, February 2, 2011 2:47:13 PM
Subject: Re: LF: Dumb homebrewer - Advice needed

At 13:51 02-02-11, you wrote:
> Hello LF,
>=20
> I would like to improve a bit my home-made pre-selector for LF/MF. I wou=
ld=20
>appreciate very basic advice on "mechanical" aspects like the following:=
 the=20
>pre-selector has some molded inductors that can be selected by means of=
 a rotary=20
>switch (band selector). Is it advisable to mount the inductors directly=
 on the=20
>switch terminals or on a separate (small) PCB? Shorter is better in this=
 case or=20
>not?
>=20
> Best regards
> Daniele

With Lambda=3D2200 m everthing shorter than L/10 (220 m) is "short" :-)
Don't worry, 30 cm at 137 kHz is like a low inductance microwave bonding.=
=20
Mechanical considerations prevail.

73 - Marco IK1ODO


     =20

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<html><head><style type=3D"text/css"><!-- DIV {margin:0px;} --></style></h=
ead><body><div style=3D"font-family:arial, helvetica, sans-serif;font-size=
:10pt"><DIV>Many thanks to Petr and Marco for their replies.</DIV>
<DIV>I suppose&nbsp;the same considerations apply&nbsp;to stray capacitanc=
es? For example, connecting to&nbsp;the 30-350pF tuning capacitor by using=
 a twisted pair of&nbsp;wires (10cm long) or running the same wires&nbsp;a=
s&nbsp;separate as possible&nbsp;from each other has no relevance. Correct=
?<BR></DIV>
<DIV>Best regards</DIV>
<DIV>Daniele</DIV>
<DIV style=3D"FONT-SIZE: 10pt; FONT-FAMILY: arial, helvetica, sans-serif">=
<BR>
<DIV style=3D"FONT-SIZE: 13px; FONT-FAMILY: arial, helvetica, sans-serif">=
<FONT face=3DTahoma size=3D2>
<HR SIZE=3D1>
<B><SPAN style=3D"FONT-WEIGHT: bold">From:</SPAN></B> Marco IK1ODO -2 &lt;=
ik1odo@spin-it.com&gt;<BR><B><SPAN style=3D"FONT-WEIGHT: bold">To:</SPAN><=
/B> rsgb_lf_group@blacksheep.org<BR><B><SPAN style=3D"FONT-WEIGHT: bold">S=
ent:</SPAN></B> Wed, February 2, 2011 2:47:13 PM<BR><B><SPAN style=3D"FONT=
-WEIGHT: bold">Subject:</SPAN></B> Re: LF: Dumb homebrewer - Advice needed=
<BR></FONT><BR>At 13:51 02-02-11, you wrote:<BR>&gt; Hello LF,<BR>&gt; <BR=
>&gt; I would like to improve a bit my home-made pre-selector for LF/MF.=
 I would appreciate very basic advice on "mechanical" aspects like the fol=
lowing: the pre-selector has some molded inductors that can be selected by=
 means of a rotary switch (band selector). Is it advisable to mount the in=
ductors directly on the switch terminals or on a separate (small) PCB? Sho=
rter is better in this case or not?<BR>&gt; <BR>&gt; Best regards<BR>&gt;=
 Daniele<BR><BR>With Lambda=3D2200 m everthing shorter than L/10 (220 m)=
 is "short"
 :-)<BR>Don't worry, 30 cm at 137 kHz is like a low inductance microwave=
 bonding. Mechanical considerations prevail.<BR><BR>73 - Marco IK1ODO<BR><=
BR><BR></DIV></DIV></div><br>

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