Re: US 60 Meter Band Changes Approved by FCC - CW Issues

Posted by Mike Harris on Nov 19, 2011; 11:06pm
URL: http://elecraft.85.s1.nabble.com/US-60-Meter-Band-Changes-Approved-by-FCC-CW-Issues-tp7012018p7012301.html

Not if CONFIG: CW WGHT 5 is selected Automatic VFO offset SSB/CW.  The
indicated carrier frequency will vary by the amount of the selected
sidetone.

Regards,

Mike VP8NO

On 19/11/2011 19:44, Don Wilhelm wrote:

> Mike,
>
> Not all transceivers shift the transmit frequency.
>
> The Elecraft K2 and K3 dial always indicate the carrier frequency, and
> what is displayed does not change when changing modes.  With Elecraft,
> the pitch of signals will change when changing between CW and SSB.
>
> OTOH, my Yaesu transceivers do shift the displayed frequency when
> changing between SSB and CW, but they shift the receiver - the display
> will indicate the transmitted carrier frequency.  If you were receiving
> a signal in SSB mode and shift to CW, the pitch will stay the same.
>
> With either Elecraft or Yaesu, there is nothing complicated to figure
> out - set the displayed frequency to the center channel frequency - but
> with the Yaesu, one must do that AFTER setting to CW mode.  With the
> Elecraft gear, you can set the frequency in whichever mode you choose,
> then switch to CW.
>
> 73,
> Don W3FPR
>
> On 11/19/2011 4:47 PM, Mike Morrow wrote:
>> The point to be taken is that most HAM transceivers, when the emission
>> mode is changed from USB to CW, shift either the effective receive or
>> the transmit frequency by the desired amount of sidetone frequency.
>> They don't shift both the effective receive AND the transmit
>> frequency. For example, a transceiver tuned to 5357.0 kHz on the dial
>> in USB mode will produce a zero Hz AF output when receiving a
>> transmitted signal of 5357.0 kHz, and a 1500 Hz AF output when
>> receiving a transmitted signal of 5358.5 kHz. 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). But the new FCC rules require that the
>> CW transmit frequency be 5358.5 kHz, which will produce an undesirably
>> high side tone to any USB/CW mode receiver set to 5357.0 kHz. If you
>> are in a USB phone QSO on 5357.0 kHz, anyone sending a CW signal on
>> that channel must do that using 5358.5 kHz. The phone boys will hear
>> not the typically 800 Hz sidetone, but rather a high 1500 Hz sidetone!

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