To: rsgb_lf_group@blacksheep.org
References: <E1aIaXN-0002zT-19@post.thorcom.com> <5694071F.2000706@freenet.de>
 <6F658A0C-E347-4C74-872F-8DEE7B6CC0EE@talktalk.net>
 <56943BDE.3060201@freenet.de>
 <6D2C8500-0E97-42DA-AB21-D41F46E72D3C@talktalk.net>
From: =?UTF-8?Q?Wolfgang_B=c3=bcscher?= <dl4yhf@freenet.de>
Message-ID: <5696947A.60906@freenet.de>
Date: Wed, 13 Jan 2016 19:16:26 +0100
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:38.0) Gecko/20100101
 Thunderbird/38.5.1
MIME-Version: 1.0
In-Reply-To: <6D2C8500-0E97-42DA-AB21-D41F46E72D3C@talktalk.net>
Subject: Re: LF: FW: powered down from "4" to "2" on IC706mk2G due to
 interference with home routers es QRM from XYL es kids
Content-Type: multipart/alternative;
 boundary="------------060403070709060907030506"
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.
--------------060403070709060907030506
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit


Am 12.01.2016 um 22:34 schrieb Mal Hamilton:
> Wolf
> What is the comparater chip u use
> to conv 706 sine wave to sq wave
> Mal/g3kev
>
an antique NE529 (in the *switching mode linear* as described on my 
website). I only used it because it was in the junk box, but would not 
recommend them for a new design if you had to order parts. The three 
supply voltages are a plague, especially the negative 'analog' supply. 
Use a modern rail-to-rail comparator with a few nanoseconds,  for 
example LT1016.

If I was to build such a PA again, I would now use a simple linear 
regulator instead of the switching-mode DC modulator, since *most* of 
the time the output amplitude is near 'full power' anyway.
Or use a dsPIC to provide the control signals for the RF driver and the 
modulator instead of the 'mass grave' of digital gates.

73,
   Wolf .


--------------060403070709060907030506
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: 8bit

<html>
  <head>
    <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
  </head>
  <body text="#000000" bgcolor="#FFFFFF">
    <br>
    <br>
    <div class="moz-cite-prefix">Am 12.01.2016 um 22:34 schrieb Mal
      Hamilton:<br>
    </div>
    <blockquote
      cite="mid:6D2C8500-0E97-42DA-AB21-D41F46E72D3C@talktalk.net"
      type="cite">
      <meta http-equiv="content-type" content="text/html; charset=utf-8">
      <div>Wolf</div>
      <div>What is the comparater chip u use</div>
      <div>to conv 706 sine wave to sq wave</div>
      <div>Mal/g3kev</div>
      <div><br>
      </div>
    </blockquote>
    an antique NE529 (in the *switching mode linear* as described on my
    website). I only used it because it was in the junk box, but would
    not recommend them for a new design if you had to order parts. The
    three supply voltages are a plague, especially the negative 'analog'
    supply. Use a modern rail-to-rail comparator with a few
    nanoseconds,  for example LT1016.<br>
    <br>
    If I was to build such a PA again, I would now use a simple linear
    regulator instead of the switching-mode DC modulator, since *most*
    of the time the output amplitude is near 'full power' anyway.<br>
    Or use a dsPIC to provide the control signals for the RF driver and
    the modulator instead of the 'mass grave' of digital gates.<br>
    <br>
    73,<br>
      Wolf .<br>
    <br>
  </body>
</html>

--------------060403070709060907030506--