> 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 <li...@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
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