Received-SPF: neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) client-ip=195.171.43.25;
Message-ID: <52632259.2000407@iup.uni-heidelberg.de>
Date: Sun, 20 Oct 2013 02:22:49 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3
MIME-Version: 1.0
To: rsgb_lf_group@blacksheep.org
References: <525489E6.4@iup.uni-heidelberg.de> <1382206811.50957.YahooMailNeo@web162606.mail.bf1.yahoo.com>
In-Reply-To: <1382206811.50957.YahooMailNeo@web162606.mail.bf1.yahoo.com>
Subject: Re: LF: WSPR 15 tonite
Content-Type: multipart/alternative;
 boundary="------------040401090804090508070103"
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org
Status: O

This is a multi-part message in MIME format.
--------------040401090804090508070103
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: quoted-printable
X-MIME-Autoconverted: from 8bit to quoted-printable by relay2.uni-heidelberg.de id r9K0Msib004068

Hello John,

Good decision! LF is the real challenge and as you can see here, 160m is=20
certainly not "Top Band" ;-)

The IDC-136 receiver is used with great results. It is used by YV7MAE,=20
TF3HZ, Edgar J. Twining  (SWL, VK7) and many more stations. Stability is=20
fine for WSPR-15. Got a decode by YV7MAE last season over 7800 km=20
distance=20
(https://dl.dropboxusercontent.com/u/19882028/LF/WSPR15_LF_15022013.png).=
 And=20
BTW the manufactorer of the RX is also member of this reflector :-)

I guess the sensitivity and dynamic range is completely sufficient for=20
EN51VM. Proven useful modifications can be done on the RX antenna for=20
most radio stations. A cleaner earth or a better decoupling to the noisy=20
shack for example.
What kind of antenna do you inted to connect?

73 and good luck on LF!

Stefan/DK7FC


Am 19.10.2013 20:20, schrieb John Lutz:
> Gents,
> Please forgive me if this isn't the correct way or place to ask the=20
> following question, but I've pretty much exhausted all other=20
> possibilities...
> After almost 40 years of HF DXing, I finally decided to try QRSS and=20
> WSPR reception on 137 KHz.  Knowing that my stock FT-920 isn't the=20
> best at frequency stability, I decided to find a dedicated rig=20
> - something simple, inexpensive, and yet stable enough to serve the=20
> intended purpose.  I chose the IDC-136II direct conversion "receiver"=20
> from ICAS Enetrprises in Tokyo.  I put the quote marks around the word=20
> /receiver/, because the unit is really just a down-converter, with the=20
> lower mixing product at audio frequencies.
> I've read that people (VK2XV and others) have devised modifications=20
> for the IDC-136II, but I haven't been able to get any details. I'm=20
> wondering if anyone here is using one of these units, and (if so) what=20
> their experience with it has been. I'm especially interested in=20
> chasing down details on any modifications that have proven useful for=20
> enhancing dynamic range or sensitivity.
> Thanks very much.
> John N9JL
> EN51vm
>
>
> On Tuesday, October 8, 2013 5:43 PM, Stefan Sch=E4fer=20
> <Stefan.Schaefer@iup.uni-heidelberg.de> wrote:
> LF,
>
> tonite i'm back in WSPR-15 until 06:15 UTC.
> Reports welcome.
>
> 73, Stefan/DK7FC
>
>
>

--------------040401090804090508070103
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
  <meta content="text/html; charset=ISO-8859-1"
 http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
Hello John,<br>
<br>
Good decision! LF is the real challenge and as you can see here, 160m
is certainly not "Top Band" ;-)<br>
<br>
The IDC-136 receiver is used with great results. It is used by YV7MAE,
TF3HZ, Edgar J. Twining&nbsp; (SWL, VK7) and many more stations. Stability
is fine for WSPR-15. Got a decode by YV7MAE last season over 7800 km
distance
(<a class="moz-txt-link-freetext" href="https://dl.dropboxusercontent.com/u/19882028/LF/WSPR15_LF_15022013.png">https://dl.dropboxusercontent.com/u/19882028/LF/WSPR15_LF_15022013.png</a>).
And BTW the manufactorer of the RX is also member of this reflector :-)<br>
<br>
I guess the sensitivity and dynamic range is completely sufficient for
EN51VM. Proven useful modifications can be done on the RX antenna for
most radio stations. A cleaner earth or a better decoupling to the
noisy shack for example. <br>
What kind of antenna do you inted to connect?<br>
<br>
73 and good luck on LF!<br>
<br>
Stefan/DK7FC<br>
<br>
<br>
Am 19.10.2013 20:20, schrieb John Lutz:
<blockquote
 cite="mid:1382206811.50957.YahooMailNeo@web162606.mail.bf1.yahoo.com"
 type="cite">
  <div
 style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-family: HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif; font-size: 12pt;">
  <div><span>Gents,</span></div>
  <div><span></span>&nbsp;</div>
  <div><span>Please forgive me if this isn't the correct way or place
to ask the following question, but I've pretty much exhausted all other
possibilities...</span></div>
  <div><span></span>&nbsp;</div>
  <div><span>After almost 40 years of HF DXing, I finally decided to
try QRSS and WSPR reception on 137 KHz.&nbsp; Knowing that my stock&nbsp;FT-920
isn't the best at frequency&nbsp;stability, I decided to find&nbsp;a dedicated
rig -&nbsp;something&nbsp;simple, inexpensive, and yet stable enough to serve&nbsp;the
intended purpose.&nbsp;&nbsp;I chose the IDC-136II direct conversion "receiver"
from ICAS Enetrprises in Tokyo.&nbsp; I put the quote marks around the word <em>receiver</em>,
because the unit is really just a down-converter, with the lower mixing
product at audio frequencies.</span></div>
  <div><span></span>&nbsp;</div>
  <div><span>I've&nbsp;read that people (VK2XV and others) have devised
modifications for the IDC-136II, but I haven't been able to get any
details.&nbsp;&nbsp;</span><span>I'm wondering if anyone here&nbsp;is using one of
these units, and (if so) what their experience with it has been. I'm
especially interested in chasing down details on any modifications that
have proven useful for enhancing dynamic range or sensitivity.</span></div>
  <div><span></span>&nbsp;</div>
  <div><span>Thanks very much.</span></div>
  <div><span></span>&nbsp;</div>
  <div><span>John N9JL</span></div>
  <div><span>EN51vm</span></div>
  <div style="display: block;" class="yahoo_quoted"> <br>
  <br>
  <div
 style="font-family: HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif; font-size: 12pt;">
  <div
 style="font-family: HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif; font-size: 12pt;">
  <div dir="ltr"> <font face="Arial" size="2"> On Tuesday, October 8,
2013 5:43 PM, Stefan Sch&auml;fer
<a class="moz-txt-link-rfc2396E" href="mailto:Stefan.Schaefer@iup.uni-heidelberg.de">&lt;Stefan.Schaefer@iup.uni-heidelberg.de&gt;</a> wrote:<br>
  </font> </div>
  <div class="y_msg_container">LF,<br>
  <br>
tonite i'm back in WSPR-15 until 06:15 UTC.<br>
Reports welcome.<br>
  <br>
73, Stefan/DK7FC<br>
  <br>
  <br>
  <br>
  </div>
  </div>
  </div>
  </div>
  </div>
</blockquote>
</body>
</html>

--------------040401090804090508070103--