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Message-ID: <1346700624.89601.YahooMailNeo@web133202.mail.ir2.yahoo.com>
Date: Mon, 3 Sep 2012 20:30:24 +0100 (BST)
From: M0FMT <m0fmt@yahoo.co.uk>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
In-Reply-To: <5044F0F2.6020902@iup.uni-heidelberg.de>
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Subject: LF: Re: Softrock SDR RX/TX on LF
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1a. Re: 500 kHz RXTX Ensemble operation=0APosted by: "Parks, Tony" kb9yig@f=
ivedash.com kb9yig=0A=A0=A0=A0 Date: Mon Sep 3, 2012 7:01 am ((PDT))=0A=0AG=
ood Morning All,=0A=0AThe clk/16 circuit board layout for the low-cost add-=
on circuit board to=0Aprovided for LF operation of the RXTX Ensemble transc=
eiver was completed=0Athis past weekend.=0A=0AThe board is small, 1.0 inche=
s x0.625 inches, and mounts two 74AC74 devices=0Ato provide for a clock div=
ision of 16 on the clock signal coming from the=0ASi570 via T1.  Other comp=
onents included on the board are three capacitors=0Aand four resistors.  Tw=
o of the resistors need to be mounted on the add-on=0Aboard with their lead=
s extending below the board to mate up with the=0AR12/R14 hole pattern on t=
he RXTX board for power and signal connections=0Abetween  the two boards.=
=0A=0AWith an overall division of 64 on the Si570 output frequency to the Q=
SD/QSE=0Aquadrature clocks the Si570 will be at about 8.7 MHz for 136 kHz o=
peration=0Aand about 32 MHz for 500 kHz operation.=0A=0APrototype clk/16 ci=
rcuit boards will go on order Tuesday and boards should=0Abe back by early =
this coming week.  What remains now is to get the details=0Aworked out for =
the LPF/BPF changes on the RXTX board for the two LF=0Afrequency options.=
=0A=0AI am still planing on building up two test samples of the RXTX Ensemb=
le=0Atransceiver, one for the 136 kHz case and one for the 500 kHz case.  T=
hese=0Atwo test samples will be sent at no charge to people who are interes=
ted in=0Aevaluating RXTX LF operation.=0A=0AThanks for your interest in the=
 project.=0A=0A73,=0ATony KB9YIG=0A=0A=A0=0AThink this is a candidate for t=
his group to get involved with?=0A=A0=0A73 es GL Pete M0FMT IO91UX=0A=0A=0A=
>________________________________=0A>=A0
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<html><body><div style=3D"color:#000; background-color:#fff; font-family:ve=
rdana, helvetica, sans-serif;font-size:12pt"><div>1a. Re: 500 kHz RXTX Ense=
mble operation<br>    Posted by: "Parks, Tony" <a href=3D"mailto:kb9yig@fiv=
edash.com" ymailto=3D"mailto:kb9yig@fivedash.com"><font color=3D"#0066cc">k=
b9yig@fivedash.com</font></a> kb9yig<br>&nbsp;&nbsp;&nbsp; Date: Mon Sep 3,=
 2012 7:01 am ((PDT))<br><br>Good Morning All,<br><br>The clk/16 circuit bo=
ard layout for the low-cost add-on circuit board to<br>provided for LF oper=
ation of the RXTX Ensemble transceiver was completed<br>this past weekend.<=
br><br>The board is small, 1.0 inches x0.625 inches, and mounts two 74AC74 =
devices<br>to provide for a clock division of 16 on the clock signal coming=
 from the<br>Si570 via T1.  Other components included on the board are thre=
e capacitors<br>and four resistors.  Two of the resistors need to be mounte=
d on the add-on<br>board with their leads extending below the board to mate
 up with the<br>R12/R14 hole pattern on the RXTX board for power and signal=
 connections<br>between  the two boards.<br><br>With an overall division of=
 64 on the Si570 output frequency to the QSD/QSE<br>quadrature clocks the S=
i570 will be at about 8.7 MHz for 136 kHz operation<br>and about 32 MHz for=
 500 kHz operation.<br><br>Prototype clk/16 circuit boards will go on order=
 Tuesday and boards should<br>be back by early this coming week.  What rema=
ins now is to get the details<br>worked out for the LPF/BPF changes on the =
RXTX board for the two LF<br>frequency options.<br><br>I am still planing o=
n building up two test samples of the RXTX Ensemble<br>transceiver, one for=
 the 136 kHz case and one for the 500 kHz case.  These<br>two test samples =
will be sent at no charge to people who are interested in<br>evaluating RXT=
X LF operation.<br><br>Thanks for your interest in the project.<br><br>73,<=
br>Tony KB9YIG<br></div><div>&nbsp;</div><div>Think this is a
 candidate for this group to get involved with?<var id=3D"yui-ie-cursor"></=
var></div><div>&nbsp;</div><div>73 es GL Pete M0FMT IO91UX<br> <blockquote =
style=3D"padding-left: 5px; margin-top: 5px; margin-left: 5px; border-left-=
color: rgb(16, 16, 255); border-left-width: 2px; border-left-style: solid;"=
>  <div style=3D"font-family: verdana, helvetica, sans-serif; font-size: 12=
pt;"> <div style=3D"font-family: times new roman, new york, times, serif; f=
ont-size: 12pt;"> <div dir=3D"ltr"> <font size=3D"2" face=3D"Arial"> <div s=
tyle=3D"margin: 5px 0px; padding: 0px; border: 1px solid rgb(204, 204, 204)=
; height: 0px; line-height: 0; font-size: 0px;" class=3D"hr" contentEditabl=
e=3D"false" readonly=3D"true"></div>&nbsp;</font></div></div></div></blockq=
uote></div></div></body></html>
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