[TenTec] Orion 2 Firmware 2.044A PTT

[Rsoifer at aol.com]

I'm sure that some hams got splatter complaints, but we never did to my  
knowledge.  We didn't use it very long, because W1MX a CE 200V and  went SSB 
in 1962.  Boy, what a kluge that 200V was.  It was mostly  down for repairs.  
 
 
In a message dated 6/12/2010 5:05:59 P.M. GMT Standard Time,  
geraldj at weather.net writes:

While a  bit more than 100% positive modulation is possible, it comes 
with  distortion of the modulating waveform, and when hams (in the long) 
past  have invented schemes for 200% or greater positive modulation that 
claimed  to not splatter, the FCC took their licenses when they used 
those schemes  on the air.

Without a standard for the dB per S unit, all a signal  strength meter 
shows is when the signal peaks or disappears, otherwise the  readings are 
in squirds, neither reproducable, nor comparable between  receivers. But 
then in the past 50 years when a receiver has approached as  much as 6 dB 
per S unit (like Collins S-line) it was considered  "stingy."
So now in DX contacts, it seems like any signal detected is 59(9)  so 
what the meter shows doesn't matter.

73, Jerry, K0CQ

On  6/12/2010 11:30 AM, Ron Castro wrote:
> That would almost be the case  for standard pulse-width modulation or
> plate modulation, except for  positive peaks > 100% which is common in
> commercial broadcasting  (The FCC allows 125% peak positive modulation,
> but it's possible to do  much more). In this case, Doug Smith, the
> original software engineer  on the Orion designed a DSP circuit that
> actually increased the  carrier as the modulation pushed past a certain
> point. There was a  detailed explanation in his website, but
> unfortunately the site is  gone. There may be articles about this in QEX.
>
> BTW, although  the agreed-on standard for an S-Unit is 6 dB, many radios,
> including  the Orion II with the newest firmware in, use 3 dB. The late
> Jerry  Cebik had an excellent article on the genesis of the S-Unit and
> the  RST system, but that's gone from the web too.
>
> Ron N6IE
>  www.N6IE.com
>
>
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