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Date: Wed, 2 Feb 2011 09:55:26 -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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Thanks, Jim.
Best regards
D.




________________________________
From: James Moritz <james.moritz@btopenworld.com>
To: rsgb_lf_group@blacksheep.org
Sent: Wed, February 2, 2011 6:35:16 PM
Subject: Re: LF: Dumb homebrewer - Advice needed

Dear Daniele, LF Group,

The main effect of the twisted wires will be to add a small, fixed amount of 
capacitance - of the order of several pF for 10cm of wire. There will also be a 
slight increase in loss if PVC insulated wire is used, but probably only 
detectable at the upper end of the tuning range. If you are twisting the wires 
together for screening purposes, it would be better to use a short length of 
coax.

Cheers, Jim Moritz
73 de M0BMU


----- Original Message ----- From: "Daniele Tincani" <danieletincani@yahoo.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Wednesday, February 02, 2011 3:03 PM
Subject: Re: LF: Dumb homebrewer - Advice needed


Many thanks to Petr and Marco for their replies.
I suppose the same considerations apply to stray capacitances? For example,
connecting to the 30-350pF tuning capacitor by using a twisted pair of wires
(10cm long) or running the same wires as separate as possible from each other
has no relevance. Correct?

Best regards
Daniele


      

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<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:arial, helvetica, sans-serif;font-size:10pt"><DIV>Thanks, Jim.</DIV>
<DIV>Best regards</DIV>
<DIV>D.<BR></DIV>
<DIV style="FONT-SIZE: 10pt; FONT-FAMILY: arial, helvetica, sans-serif"><BR>
<DIV style="FONT-SIZE: 13px; FONT-FAMILY: arial, helvetica, sans-serif"><FONT face=Tahoma size=2>
<HR SIZE=1>
<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> James Moritz &lt;james.moritz@btopenworld.com&gt;<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> rsgb_lf_group@blacksheep.org<BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Wed, February 2, 2011 6:35:16 PM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: LF: Dumb homebrewer - Advice needed<BR></FONT><BR>Dear Daniele, LF Group,<BR><BR>The main effect of the twisted wires will be to add a small, fixed amount of capacitance - of the order of several pF for 10cm of wire. There will also be a slight increase in loss if PVC insulated wire is used, but probably only detectable at the upper end of the tuning range. If you are twisting the wires together for screening purposes, it would be better to use a short length of coax.<BR><BR>Cheers, Jim Moritz<BR>73 de M0BMU<BR><BR><BR>----- Original Message ----- From: "Daniele Tincani" &lt;<A href="mailto:danieletincani@yahoo.com"  ymailto="mailto:danieletincani@yahoo.com">danieletincani@yahoo.com</A>&gt;<BR>To: &lt;<A href="mailto:rsgb_lf_group@blacksheep.org" ymailto="mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org</A>&gt;<BR>Sent: Wednesday, February 02, 2011 3:03 PM<BR>Subject: Re: LF: Dumb homebrewer - Advice needed<BR><BR><BR>Many thanks to Petr and Marco for their replies.<BR>I suppose the same considerations apply to stray capacitances? For example,<BR>connecting to the 30-350pF tuning capacitor by using a twisted pair of wires<BR>(10cm long) or running the same wires as separate as possible from each other<BR>has no relevance. Correct?<BR><BR>Best regards<BR>Daniele<BR><BR><BR></DIV></DIV></div><br>

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