[Boatanchors] SSB and carrier insertion?

[rkerr]

SSB with carrier is not illegal.  The Heath HX-10 Marauder and the 
Collins KWS-1 were designed with the capability of generating SSB with 
carrier.

The only advantages to doing this are 1) it allows a rig that was 
primarily designed as a SSB - suppressed carrier system to transmit an 
AM mode with carrier, which is detectable by AM receivers using envelope 
detectors, without extensive modifications and 2) the signal takes up 
less bandwidth than a DSB with carrier signal.

This mode is quite inefficient, with respect to conversion of DC input 
power to useful RF output power, since the RF power amplifier must be 
run in Class A or AB, rather than the more efficient Class C of a plate 
modulated AM rig, in order to maintian linearity.  In addition, you only 
achieve half the transmitted information power of a DSB signal with the 
same carrier power.  The SSB with carrier signal is somewhat more 
susceptible to HF fading than a DSB with carrier signal is.

Bob
WB4TGG

James M. Walker wrote:

>Naw,
>not illegal, MY Central Electronics 10A, 10B and 20A all do it that way.
>Jim
>WB2FCN
>
>----- Original Message -----
>From: "Eugene Hertz" <ehertz at tcaf.org>
>To: <boatanchors at mailman.qth.net>
>Sent: Monday, March 14, 2005 1:56 PM
>Subject: [Boatanchors] SSB and carrier insertion?
>
>
>Here's my question. I've begun studying for my general and I read in the
>arrl book that inserting a carrier with one side band in not a legal
>emission. Is that right? Could I have misread this? If I read that right,
>can anyone explain why if DSB with carrier (am) is allowed and LSB and USB
>without carrier, why wouldnt LSB-C or USB-C (with carrier) be allowed?
>
>As soon as I get my general and code passed, my transmitter is a central
>electronics 100V (courtesy W0YVA). This radio has SSB and also SSB with
>carrier inserted modes (also has PM, AM, FSK, you name it!) and I began to
>wonder was this kind of emission legal at one time (radio was made around
>1959) ? Does any one know when/why it became illegal?
>
>Also, what would be the benefit of running SSB with carrier? Does it make
>the signal more easily detected? say, without the need for a product
>detector, but just a BFO?
>
>Thanks in advance (for being patient with all my questions!)
>Eugene
>KC2NWG
>
>
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