On 3/29/2012 9:31 PM, Ron Kolarik wrote:
> Uhh, doesn't the K3 use a 15khz IF?
Yes ...
> If you use the FSK keying input on it you're just generating 2 audio
> tones in DSP....AFSK controlled by the firmware.
No, it is generating and shifting one tone ... taking two alternating
external audio signals and mixing them with a 15 KHz carrier in a
balanced modulator (even a numerical balanced modulator) to generate a
frequency shifted 15 +/- KHz signal. The K3 generates the FSK signal
directly in the DSP - there is no external audio input.
> A lot of the modern rigs do the same thing regardless of what
> the keying input is marked......FSK=keyed internal audio tones.
Yes, some do ... but even then the tones do not pass through a mic
preamp that is sensitive to clipping/distortion or through a user
(mis)adjustable "mic gain" control, etc.
73,
... Joe, W4TV
On 3/29/2012 9:31 PM, Ron Kolarik wrote:
> Uhh, doesn't the K3 use a 15khz IF? If you use the FSK keying input on it
> you're just generating 2 audio tones in DSP....AFSK controlled by the
> firmware. A lot of the modern rigs do the same thing regardless of what
> the keying input is marked......FSK=keyed internal audio tones.
>
> Ron
> K0IDT
>
>
> ----- Original Message ----- From: "Joe Subich, W4TV" <lists@subich.com>
> To: "Jay WS7I" <ws7ik7tj@gmail.com>; "RTTY" <rtty@contesting.com>
> Sent: Thursday, March 29, 2012 7:47 PM
> Subject: Re: [RTTY] Fw: ARLB006 NTIA: No Objection to Additional Data
> Modes on60 Meters
>
>
>>
>>> Especially true since for at least 20 years no radio that I know of
>>> does actual FSK in any case.
>>
>> The K3 does true FSK ... it's done using DSP to create the signal
>> directly at the IF.
>>
>> 73,
>>
>> ... Joe, W4TV
>>
>>
>> On 3/29/2012 7:57 PM, Jay WS7I wrote:
>>> Especially true since for at least 20 years no radio that I know of does
>>> actual FSK in any case. Its just AFSK converted. Last true FSK that I
>>> used was back in 1986 with Hal WA7EGA and that resulted in an actual
>>> phone call from the FCC during some contest. Seems the fine FSK in the
>>> old Kenwood Twins (home brew of course) had a little or maybe they
>>> thought a major problem as we were on 14.088 with a birdie on Air Force
>>> MARS Transcon which is just below the edge of the band.
>>>
>>> Hal took that fine FSK'd set of Twins to the Hamfest and gave them
>>> away. He then got with the semi-modern world and launched an Icom-751
>>> which I had one of and of course it was FSK or rather AFSK converted.
>>> Even those we had to tune prior to every contest to 170 Hz as they
>>> shifted during the contest.
>>>
>>> That's like saying the modern soundcard works better than my iron.
>>> ST-8000. Only one person has one program that is better than my ST-8000
>>> and that is Chen. His might even be better. (And you need not bring up
>>> RITTY as it doesn't work with Windows 7). So here I sit with a MacBook
>>> and Chen's program busily receiving along with my ST-8000 on a PC.
>>>
>>> Look out for cocoaModem III or should I perhaps say "New cocoaModem".
>>>
>>> Heh heh.
>>>
>>> Jay
>>>
>>>
>>>
>>> On 3/29/2012 4:37 PM, James C. Hall, MD wrote:
>>>> Ohhhhh, this should be interesting. What technological advantages
>>>> are there
>>>> to AFSK ?? It is SOOoooo much easier to do FSK IMHO. Radios such as
>>>> the K3
>>>> do make it easy with either FSK or AFSK. But what "technological
>>>> advantages"
>>>> exist ??
>>>>
>>>> Good thread.
>>>>
>>>> 73, Jamie
>>>> WB4YDL
>>>>
>>>> -----Original Message-----
>>>> From: rtty-bounces@contesting.com
>>>> [mailto:rtty-bounces@contesting.com] On
>>>> Behalf Of Kok Chen
>>>> Sent: Thursday, March 29, 2012 6:21 PM
>>>> To: RTTY Reflector
>>>> Subject: Re: [RTTY] Fw: ARLB006 NTIA: No Objection to Additional
>>>> Data Modes
>>>> on60 Meters
>>>>
>>>>
>>>> On Mar 29, 2012, at 4:13 PM, Joe Subich, W4TV wrote:
>>>>
>>>>> AFSK is the RTTY mode for technological novices ... those who do not
>>>>> know how to operate their transceivers in the way the manufacturer
>>>>> designed them to operate.
>>>> I would like you to substantiate that statement, Joe.
>>>>
>>>> I haven't transmitted using FSK for years now. There is so many more
>>>> technological advantages to using AFSK.
>>>>
>>>> 73
>>>> Chen, W7AY
>>>>
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