[RTTY] K3 reduced-bandwidth RTTY analysis

[Robert Chudek - K0RC]

The only way we're going to clean up the bands quickly is to pass 
legislation equivalent to the "Cash for Clunkers" program. You know, 
something like "Your old rig plus $100 for a brand new K3".

We could then be entertained watching videos on YouTube of Icom 7800's, 
Kenwood 990's, Yaesu 5000's, and Swan 350's being fed into scrap metal 
crushers.

...well, it was just a thought.

73 de Bob - KØRC in MN

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On 3/22/2013 4:36 PM, Kok Chen wrote:
> On Mar 22, 2013, at 1:31 PM, Joe Subich, W4TV wrote:
>
>> Similarly, even ARRL (most specifically W3IZ's review in the current
>> issue of QST) do not make the slightest mention of signal purity issues
>> like the absolutely horrible transmit phase noise spectrum of the new
>> FT-3000.
> As bad as the FT-dx3000, its transmit phase noise (about -100 dBc at a 1 kHz offset) is still nowhere close to the interference from an (continuous phase) FSK signal, whose keying sidebands are in the region of -60 dBc at the same 1 kHz offset from one of the FSK tones.
>
> You might be confusing the transmit phase noise with the poor reciprocal mixing (-82 dBc at 2 kHz offset) in the FT-dx3000.  The latter only affects the owner, not the other occupants of the band.  But even that number is still dominated by FSK keyclicks from a signal that is 2 kHz offset away (although not by much).
>
> One way to look at it is that if you receive with an FT-dx3000, you probably won't be able to tell if the other people are filtering their RTTY signals :-).
>
> 73
> Chen, W7AY
>
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