Message-ID: <4F69D110.6020007@iup.uni-heidelberg.de>
Date: Wed, 21 Mar 2012 14:01:04 +0100
From: =?ISO-8859-15?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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To: rsgb_lf_group@blacksheep.org
References: <4F68FEDF.4030201@iup.uni-heidelberg.de> <366E681C214B4F78AB071DAD28D34386@GaryPC>
In-Reply-To: <366E681C214B4F78AB071DAD28D34386@GaryPC>
Subject: Re: LF: Re: 137 kHz transmit IQ converter schematic
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Oops, thanks Gary. Try again. I did a minor change in the schematic and=20
updated the file, i thought with the same name.
Now a new link and test:=20
http://dl.dropbox.com/u/19882028/LF/schematics/TX%20IQ%20converter.png
Should work now.
73, Stefan

Am 21.03.2012 13:37, schrieb Gary G4WGT:
> Stefan,
>
> The link did not work for me.
>
> 73, Gary - G4WGT.
>
>
> ----- Original Message ----- From: "Stefan Sch=E4fer"=20
> <Stefan.Schaefer@iup.uni-heidelberg.de>
> To: <rsgb_lf_group@blacksheep.org>
> Sent: Tuesday, March 20, 2012 10:04 PM
> Subject: LF: 137 kHz transmit IQ converter schematic
>
>
>> LF,
>>
>> I took the time to draw the circuit of my transmit IQ converter in=20
>> the new program i have.
>> This is the circuit i use to generate my transmit signal to drive the=20
>> exciter of my PA. The 137 kHz signal is directly generated in this=20
>> circuit. It is mixed with 125 kHz internally.
>> The basic idea is taken from Andy/G4JNT, tnx agn. The circuit is=20
>> however modified for an input frequency of 10.7...12.8 kHz which can=20
>> be generated by the soundcard. The 125 kHz generator can be locked to=20
>> a reference signal, into a PLL which isn't shown here (separate=20
>> circuit). Anyway the circuit is a stand alone device. The input=20
>> signal level may be 0 (=3D100%) down to -30 dB full scale of the=20
>> soundcard without a change of the output signal (including a safety=20
>> factor of > 10 dB).
>>
>> http://dl.dropbox.com/u/19882028/LF/schematics/TX%20IQ%20converter.png
>>
>> Comments welcome.
>>
>> 73, Stefan/DK7FC
>>
>>
>