[Flexradio] are we getting close to FSK yet

[FireBrick]

I agree with you guys on this.
I really don't care if it's AFSK or FSK.
(although 200Hz wide vs. 170Hz 'could' crowd the bands a bit more.

Although probably not so much.

But
What I would like...is FSK 'like' operation.

Bob Tracy installed the 'offset' features for us.
But just for ease. I would like to see the VFO's take advantage and 
accurately read out with the 'offset' adjusted frequency.

During TPA operation, someone asks me for a rtty qso, and says he's at 7047
I have to mentally compute and change the PWSDR vfo readout.

It's purely a 'convienence' issue for me.
(math is a foreign language to me)


----- Original Message ----- 
From: "Neal Campbell" <nealk3nc at gmail.com>
To: "Brian Lloyd" <brian-wb6rqn at lloyd.com>
Cc: <flexradio at flex-radio.biz>
Sent: Friday, February 06, 2009 7:02 PM
Subject: Re: [Flexradio] are we getting close to FSK yet


> In reality you are probably right. Those of us who have primarily been
> RTTY'ers for the past 20+ years have  come to associate afsk with
> badly setup signals, double signals, splatter, etc.
>
> I have (blindly) been holding out for FSK but after a braindropping
> from Mr. Bickle (wasn't he the Extension Agent on Green Acres?) I have
> come to the conclusion its just old analog thinking. It probably
> doesn't matter where the shifting occurs, because its going to be
> clean and filtered.
>
> Also, being able to see your signal on the PSDR panadapter keeps you
> pretty safe from overdriving it.
>
>
> Neal Campbell
> Abroham Neal Software
> Programming Services for Windows, OS X and Linux
> www.abrohamnealsoftware.com
> (540) 242 0911
>
>
>
>
> On Fri, Feb 6, 2009 at 6:06 PM, Brian Lloyd <brian-wb6rqn at lloyd.com> 
> wrote:
>>
>> On Feb 6, 2009, at 1:49 PM, Rick Markey, KN3C wrote:
>>
>>> Ditto on the requests for true FSK.  I love my 5K but have held off
>>> setting
>>> it up for RTTY because of the lack of FSK.  I ran true FSK on my Drake B
>>> line and my Kenwood 850 and 870.  You just can't beat it.  The lack of 
>>> FSK
>>> is probably the only thing I find lacking in the Flex.
>>
>> Perhaps you can enlighten me. Why would FSK in a later oscillator be 
>> better
>> than FSK in an earlier oscillator?
>>
>> Back in the good ol' days FSK was better because you were FM'ing a
>> high-stability oscillator. AFSK had to suffer with the noise and
>> nonlinearity of the audio path to the first balanced mixer. The audio 
>> chain
>> between mic jack and first balanced mixer usually wasn't all that good. 
>> It
>> certainly wasn't HiFi. ;-)
>>
>> But with the F5K, that isn't an issue. When you use a digital mode 
>> program
>> connected to PowerSDR using VAC, you are actually doing FSK. You are just
>> doing it in an earlier stage, i.e. in your first DSP stage (the digital 
>> mode
>> program). You also have all the advantages of being able to do waveform
>> shaping for sideband control. Therefore the quality of the emitted signal
>> generated inside your digital-mode program as "AFSK" will be as good or
>> better than what you can generate by FM'ing an analog BFO in your Drake.
>> There just isn't any good reason to try to do FSK of the DDS LO in the 
>> F5K.
>>
>> --
>>
>> 73 de Brian, WB6RQN/J79BPL
>> Brian Lloyd - brian HYPHEN wb6rqn AT lloyd DOT com
>>
>>
>>
>>
>>
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