[RTTY] K3

[Jim W7RY]

FSK is only one tone at a time. A 2-tone test would not be a valid for FSK 
or AFSK bandwidth.

Jim W7RY



----- Original Message ----- 
From: "Ian White GM3SEK" <gm3sek at ifwtech.co.uk>
To: <rtty at contesting.com>
Sent: Tuesday, January 06, 2009 2:17 PM
Subject: Re: [RTTY] K3


> 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?
>
>
> -- 
>
> 73 from Ian GM3SEK
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