[Elecraft] US 60 Meter Band Changes Approved by FCC - CW Issues

[Mike Morrow]

Don wrote:

> I actually was responding to a statement made in a post saying that most 
> transceivers shift the TRANSMIT frequency.

Hi Don.  Well...er...that *might* have been me when I wrote:

> When the transceiver is shifted to CW mode, the receiver frequency typically
> remains 5357.0 kHz, while the transmitter frequency is shifted up to typically
> 5357.8 kHz (for 800 Hz CW sidetone).

:-)

> If there are any that do...

In my defense, some ancient rigs like the TS-120S and others from 30 years ago
DO maintain the RECEIVER carrier frequency the same as mode changes are made,
and maintain TRANSMITTER carrier frequency that same value for LSB and USB.  But
they shift the transmitter carrier frequency up (and change the displayed frequency)
by 0.8 kHz during CW transmission.  The TS-120S in CW mode sets the receiver to
USB mode, say, on 3550.0 kHz, and when the transmitter is keyed, the frequency and
the display shift to 3550.8 kHz.  The display always shows transmit frequency
when transmitting, and always shows receive frequency when receiving.  The
current convention always shows transmit frequency, even while receiving in CW
mode.

In a way, that process more clearly shows what is happening.  Today, most rigs
show no change in displayed frequency on CW between transmit and receive.  The
casual observer knows something is changing frequency, but it's not obvious
what.

> ...I believe they are in the minority.

I'm sure you're correct.  Few rigs today follow that convention.  I prefer the
current convention.

73,
Mike / KK5F