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Is there any difference between carrier controlled AM and suppressed
carrier DSB?<br>
<br>
<div class="moz-cite-prefix">On 5/19/2018 2:15 PM, Kenneth G. Gordon
wrote:<br>
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cite="mid:5B009402.14582.A89EE49@kgordon2006.frontier.com"
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<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt">On 19 May 2018 at 20:15,
<a class="moz-txt-link-abbreviated" href="mailto:jerrylofstead@bellsouth.net">jerrylofstead@bellsouth.net</a> wrote:</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt"><br>
</span></font></div>
<div align="left"><font color="#7f0000" size="2" face="Arial"><span
style=" font-size:10pt">> AH HA.� Ididnt realize that...�
I used that for several years.� I also used screen mod.�
before i </span></font></div>
<div align="left"><font color="#7f0000" size="2" face="Arial"><span
style=" font-size:10pt">> could afford a BC191 mod.�
transformer.� Only used surplus eqpt for my early years.</span></font></div>
<div align="left"><font color="#7f0000" size="2" face="Arial"><span
style=" font-size:10pt"><br>
</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt">So have I, Jerry. :-)</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt"><br>
</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt">BTW, in my personal opinion,
Controlled-Carrier AM has a lot to recommend it, although it
does have a fault or two.</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt"><br>
</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt">I'll list some of the reasons I think it is
an excellent method.</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt"><br>
</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt">1) It requires no "heavy iron" to implement
it. It requires as few as 2 tubes. The circuit is actually
very simple. I like "simple".</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt"><br>
</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt">2) Its output characteristics make it very
suitable for driving almost any linear amp.</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt"><br>
</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt">3) If you as the user very carefully
zero-beat an SSB station with your "carrier", that SSB
station seldom realizes you are on AM. Using VOX or some
rapid TX/RX method, like a foot-switch, makes this even more
"friendly".</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt"><br>
</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt">4) The circuit takes up very little chassis
space and can be incorporated into many simple transmitters.</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt"><br>
</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt">5) It can be made to sound very good.</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt"><br>
</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt">As far as I'm concerned, the only real
"fault" with it is that it isn't "efficient", but in our
case, using simple transmitters like the DX-35, 40, 60 and
others, followed by a linear amp, this makes any loss of
efficiency in the modulated stage completely unimportant.</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt"><br>
</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt">FYI, many years ago, in Montana, I had a
Globe King 500 transmitter, which I outfitted with a
foot-switch. I would routinely check into the "local" SSB
net with it. I used the transmitter's VFO as my "BFO",
turning the receiver's BFO off, to zero-beat the SSB
stations, tuning them in with the VFO so they sounded
natural before I keyed up. I would then turn the reciever's
BFO back on.� </span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt"><br>
</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt">I used the foot-switch to rapidly switch
from TX to RX and back, so it sounded sort of like I was
using VOX.</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt"><br>
</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt">It was weeks before someone called me after
the net and told me, "Ken, you have an awful lot of carrier
in there.", I replied, "Boy! I'd BETTER have!" and laughed.</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt"><br>
</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt">He then came back with, "You mean you're on
AM?!?!?!". I just laughed again. No one else ever bothered
to ask me about that again. ;-)</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt"><br>
</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt">vy 73</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt"><br>
</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt">Ken W7EKB</span></font></div>
<div align="left">��</div>
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