[Elecraft] K3 Digital Voice Mode - our future?

[Joe Subich, W4TV]

 > FreeDV’s emission designator is 1K20J2E.

That is the *claimed* designator.

 > “J3E” is “single sideband suppressed carrier”, “single channel
 > containing analog information”, and “telephony”.

It is not J3E ... it is *J2E*.

"J" is single sideband suppressed carrier,
"2" is single channel containing quantized or digital information with
     the use of a modulating sub-carrier
"E" is telephony.

FreeDV uses quantized/digital (digitally sampled and encoded) voice
which is modulated onto a series of sub-carriers which are in turn
modulated into a single sideband transmitter.

1K20J2E meets the requirements of 97.3c(5) as a "phone" mode *if* one
ignores the incidental *"text" data"*.  There is a valid question
whether the "ID/text" bits ("data frame" in the FreeDV specification)
represents a second "data" channel which would make the FreeDV emission
designator 1K20J7W (SSB, two or more channels containing quantized or
digital information, combination of telephony and data transmission)
which *does not* comply with 97.3c(5) because the third character is
no longer "E".

73,

   ... Joe, W4TV


On 9/18/2015 7:10 PM, Walter Underwood wrote:
> FreeDV’s emission designator is 1K20J2E.
>
> The “1K20” prefix is the bandwidth. “J3E” is “single sideband suppressed carrier”, “single channel containing analog information”, and “telephony”. Totally legal.
>
> http://freedv.org/tiki-index.php?page=FreeDV+Specification
>
> wunder
> K6WRU
> CM87wj
> http://observer.wunderwood.org/ (my blog)
>
>> On Sep 18, 2015, at 3:40 PM, Joe Subich, W4TV <lists at subich.com> wrote:
>>
>>
>> Yes, digital voice is classified as Phone as long as the emission
>> designator has: "A, C, D, F, G, H, J or R as the first symbol; 1, 2, 3 or X as the second symbol; E as the third symbol." or "B or F as the first symbol; 7, 8 or 9 as the second symbol [and] E as the third
>> symbol."  - From §97.3c(5)
>>
>> 73,
>>
>>   ... Joe, W4TV
>>