[Elecraft] K3: ESSB firmware released to field testers

[wayne burdick]

I released MCU revision 2.23 to our K3 field-test group earlier this 
evening, making our promised July deadline for ESSB (Extended Single 
Sideband). The maximum ESSB transmit bandwidth is about 4 kHz -- this 
is also the WIDTH control limit in SSB mode for receive purposes. A 6 
kHz filter (AM) on the RF board is required to use ESSB, either in RX 
or TX mode.

This revision also includes changes that we hope will eliminate the 
power output difference between LSB and USB.

If all goes well, we'll post revision 2.23 on our web site (as a beta 
release) on Friday.

If you have a 6-kHz filter and would like to get a jump on ESSB testing 
(which we'd appreciate), please send me an e-mail and I'll send you a 
.zip file with this firmware revision.

73,
Wayne
N6KR

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