[aprssig] Was 6 meter APRS, now 30M tone freq's and PSK

[Stephen H. Smith]

Steve Noskowicz wrote:
> --- Stephen H. Smith  wrote that:
>
>   
>> Bob Donnell wrote:
>>     
>>>   If the radio's SSB filter is a little wide, harmonics
>>> ...outside our band - 10,150.8 and 10,151.2 kHz.  
>>>       
>
> And retorted:
>   
>> This doesn't seem to me to hold water in this case.  
>> 1)  ...the second audio harmonic ...
>> 2)  ...ODD harmonics ...even farther outside the
>> filter passband.  ...
>>     
>
>
> OOPS!  Steve, Steve, Steve.  You of all people shouldn't have missed this.
>
> The Issue is the -30 dBc Odd order products that are produced in the "linear" stages *AFTER* any filtering / phasing -- most notably the finals.  Anyone not undersatanding this look at any of the product reviews in QST of the TWO-Tone Tx spectrum.
>   

Any <RF> IMD products would spread out equally ABOVE and BELOW the 
original two tones (in this case 10.149.200/400).   It wouldn't matter 
if they were originally generated via USB or LSB.  
> 73, Steve, K9DCI, (SMHRTEP) Senior Member of the Ham Radio Technical Esplanation Police   (;-)
>
> In the words of a un-named U.S. representative: Lucy! you got some splainin' to do.
>
>
>       
>
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