[RTTY] K3

[Ian White GM3SEK]

Kok Chen wrote:
>
>As many of you know, I use waveshaped AFSK for RTTY to tightly control
>the FSK keying sidebands, and the K3 has an AFSK transmit IMD that is
>a little high for my taste.  With my K3, I'd measured about -24 dB IMD
>at 70 watts peak power using a two tone signal.  With my 1000MP, I get
>about 4 dB cleaner transmit IMD when I operate AFSK.
>
>With the PA turned off, the K3 does manage to achieve a very clean -34
>dB transmit IMD at 10 watts and below (rising again below 500 mW to
>-29 dB IMD by 200 mW).  But then, at 5 watts, I get a whopping -40 dB
>IMD with the MP.
>

Do you have comparable measurements of spectrum occupancy when the MP 
and K3 are keyed by direct FSK?


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73 from Ian GM3SEK