[hpsdr] The problem with digital modes

[Nige G7CNF]

It is a pity that the OP did not educate himself before making a 
sweeping generalisation.

A significant proportion of popular data modes operate with fixed 
messages or macros and are not keyboard to keyboard (or tend not to be 
used this way). The WSJT modes are just one example where the entire 50 
second transmit cycle is used to convey inteligence of a fixed message 
and there is no plain carrier nor modulated dead time. JT9 is just 
15.6Hz wide and I have confirmed QSO's with VK at 10mW. How much 
interference was I causing then. . .

As a long time SDR user I've seen more poorly set-up CW and SSB QRO/IMD 
causing significant interference (20+ kHz) than I see data modes doing 
the same - that is until contest time when all operators (SSB/CW/Data) 
/seem to abandon/ good operating practices and can be equally selfish. 
This is an /observation/, NOT an opinion. Oh is that a sweeping 
generalisation? ;-)

Tell me, is being able to hear the station's PA/PC fans running in the 
background in speech pauses, the kids playing, the XYL watching TV, the 
VHF radio chatter, the chair creaking; do these things convey 
intelligence that is relevent to the current contact?

73

Nige.G7CNF
interference.org.uk <http://interference.org.uk/>

On 12/05/2014 13:55, David McGaw wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
>
>
> Perhaps that could be the seed of a more neighborly digital mode that 
> transmits characters but no continuous carrier.  In this day and age 
> of GPS locked frequency references that should not be at all 
> difficult.  The only need for the carrier is to lock the receiver and 
> transmitter.
>
> 73,
>
> David N1HAC
>
>
> On 5/12/14 6:19 AM, Clyde Washburn wrote:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>>
>>
>> The primary shortcoming of digital modes is that they are spewing out 
>> full power, and occupying full BW, when the sender is saying or 
>> typing NOTHING.  The compelling advantage of SSB and CW is that they 
>> use no space, and cause no interference, when there is no 
>> intelligence being transmitted.  When there are digital modes that 
>> have at property I will get more excited about them.
>>
>> ___________________
>>
>> Clyde Washburn, K2UE
>>
>> k2ue at ieee.org <mailto:k2ue at ieee.org>
>>
>>
>>
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