[ARC5] 60m band and SCR274 transmitters

[Bill Cromwell]

Hi,

It's relative to the suppressed carrier. If the modulation is above that 
carrier frequency it is upper sideband. If it is lower than the 
'carrier' frequency it is lower sideband. The carrier frequency 
(suppressed) is well defined. In each channel your modulation must be in 
that upper region - aka upper sideband. For a bunch of CW ops in the 
regular ham bands USB and LSB is superflous. You can generate the CW 
signal any way you want. You can choose to place your receiver BFO above 
or below it no matter how it was generated. To be transmitted on 60 
meters that tone has to be in the center of the channel no matter how 
you generate it. More specifically it is supposed to be 1500 cycles per 
second above the assigned carrier frequency. 60 meters is not a "band" 
for us at all. It is five channels with assigned carrier (suppressed) 
frequencies. And rules about how our signals relate to those assigned 
frequencies.

If you swap the tones in the digital modes (inverted) both tones will 
still be above the suppressed carrier for USB. With a plain, good, old 
fashioned CW transmitter just put your signal 1500 Hz above the assigned 
channel frequency. There are numerous ways to accomplish that. Some 
people make it "complicated". As Bob points out..it's simple.

Moving closer to 60 meter operation.

73,

Bill  KU8H

On 07/22/2017 12:57 PM, WA5CAB--- via ARC5 wrote:
> Actually, with a true CW transmitter, the concept of sidebands is
> meaningless.  And with any digital mode generated with an SSB
> transmitter, with perfect carrier suppresion and the ability to invert
> MARK and SPACE if FSK, there is no way in which upper or lower sideband
> could be determined.  :-)
>
> In a message dated 07/22/2017 06:42:36 AM Central Daylight Time,
> wrcromwell at gmail.com writes:
>> Hi,
>>
>> If I recall a post from a couple of days ago the digital modes are also
>> allowed. Cw and whatever digital mode must be centered in the channel.
>> AM and DSB signals are wider than the channel limits. CW and digital
>> signals must be in the upper sideband.
>
>
> Robert & Susan Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
>
>
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

-- 
bark less - wag more