[Heath] SB-200 and AM

[ChrisIwata]

Is there any difference between carrier controlled AM and suppressed 
carrier DSB?

On 5/19/2018 2:15 PM, Kenneth G. Gordon wrote:
> On 19 May 2018 at 20:15, jerrylofstead at bellsouth.net wrote:
>
> > AH HA.  Ididnt realize that...I used that for several years.  I also used screen mod. before i
> > could afford a BC191 mod.transformer.  Only used surplus eqpt for my early years.
>
> So have I, Jerry. :-)
>
> BTW, in my personal opinion, Controlled-Carrier AM has a lot to 
> recommend it, although it does have a fault or two.
>
> I'll list some of the reasons I think it is an excellent method.
>
> 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".
>
> 2) Its output characteristics make it very suitable for driving almost 
> any linear amp.
>
> 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".
>
> 4) The circuit takes up very little chassis space and can be 
> incorporated into many simple transmitters.
>
> 5) It can be made to sound very good.
>
> 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.
>
> 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.
>
> I used the foot-switch to rapidly switch from TX to RX and back, so it 
> sounded sort of like I was using VOX.
>
> 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.
>
> 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. ;-)
>
> vy 73
>
> Ken W7EKB
>
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