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From: "Eike Katzera" <dl3ike@web.de>
To: rsgb_lf_group@blacksheep.org
Date: Fri, 8 Feb 2013 17:08:15 +0100 (CET)
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Subject: Aw: Re: LF: Re: My transmit converter description
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<html><head></head><body><div style="font-family: Verdana;font-size: 12.0px;"><div>Hi Dimitris,</div><div></div><div>have you ever thought about using an Class-D-audio-Amp as a powersupply for the Class-E-RF-Amp?</div><div>Let the audi-amp follow the rf-envelope an the rf-amp follow the frequency.&nbsp;</div><div>Is that accurate enough to work as an linear-rf-amp for digi-modes?<br/>
<br/></div><div>73s de Eike DL3IKE</div><div></div><div>PS: what are the correct settings in wspr-software for using split mode in the transceifer in combination with an transverter to prevent data mismatch in the wspr-database? Transceifer RX: 474kHz, TX:10.474kHz</div><div name="quote" style="margin:10px 5px 5px 10px; padding: 10px 0 10px 10px; border-left:2px solid #C3D9E5; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">
    <div style="margin:0 0 10px 0;">
        <b>Gesendet:</b>&nbsp;Dienstag, 05. Februar 2013 um 22:32 Uhr<br/>
        <b>Von:</b>&nbsp;&quot;Dimitrios Tsifakis&quot; &lt;dtsifakis@gmail.com&gt;<br/>
        <b>An:</b>&nbsp;rsgb_lf_group@blacksheep.org<br/>
        
        <b>Betreff:</b>&nbsp;Re: LF: Re: My transmit converter description
    </div>
    <div name="quoted-content">
        &gt; The whole point of this design is that the output impedance is 50 ohm,<br/>
&gt; therefore there is no need for impedance transformation! Try<br/>
&gt; calculating the values for a 100 V, 100 W Class-E transmitter and note<br/>
&gt; the output impedance.<br/>
<br/>
<br/>
For those not familiar with Class-E, I can control the power output of<br/>
a transmitter by the Vcc I use. The power output is proportional to<br/>
the square of the voltage, so by reducing the voltage by SQRT(2), I<br/>
get half power: 50 W from 70 volts or so. The calculated output<br/>
impedance and C1/C2/L2 do not change with scaling the voltage up and<br/>
down. That makes class-e an excellent client for amplitude modulation<br/>
:-)<br/>
<br/>
73, Dimitris<br/>
<br/>

    </div>
</div>
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