[GreenKeys] Problems on Proposed Autostart Frequency 10.133

Thu, 06 May 2004 23:04:53 -0400

Hi

I will confess that i have not personally played with all of the gear 
on your list. The question that would have to be answered with any 
radio that tunes in 1 KHz steps is what are the steps refer to.

If they are set up as SSB carrier frequencies (which is the case with 
the gear I have used) then you need offset from the 1 KHz by the audio 
tone pairs to get the on air frequencies. I have never seen a TU that 
used 1 KHz tones so what ever you wind up with will not be on an even 1 
KHz step.

If the steps are set up on a true FSK radio then they probably are 
referring to the frequency half way between the mark and space 
frequency. Since we are talking about the mark frequency here then an 
even 1 KHz multiple frequency would not be able to be tuned this kind 
of radio.  Most of this gear was set up for 850 shift so it may not be 
very useful on a 170 shift net. I suspect that USB or LSB operation 
with a audio TU would make more sense.

Bottom line is that you can set up an audio TU for just about any tone 
pair imaginable. It is no harder to set one up for a 1500 Hz mark tone 
than it is for a 1000 Hz mark tone. Both are non standard in the sense 
that you don't see them in stores. You have to do one or the other to 
get the job done with a 1KHz tune radio. I suspect that if you are 
really going to use a radio like this for RTTY on the ham bands then 
you would simply go for an audio TU with fully tunable tones. That way 
you could use it just like any other radio.

	Take Care!

		Bob Camp
		KB8TQ

On May 6, 2004, at 7:45 PM, John Vendely wrote:

> There is in fact a good deal of relatively modern SSB miltary gear in 
> common
> use amongst RTTY enthusiasts, such as the RT-662/GRC-106, AN/PRC-47,
> AN/TRC-75, etc.  All have excellent frequency stability and accuracy, 
> far
> better than amateur gear.  However, they tune in 1 kc steps and would 
> not be
> capable of tuning channels defined in integer multiples of 500 cycles. 
>   I'd
> guess many of these folks would be among those most interested in this
> proposed project.  BTW, Military RTTY (RATT in Army parlance) modems
> typically use a standardized tone center frequency of 2 kc because of 
> this.
>
> 73,
>
> John K9WT
>
> ----- Original Message -----
> From: "JerryL" <[email protected]>
> To: <[email protected]>
> Sent: Thursday, May 06, 2004 1:09 PM
> Subject: Re: [GreenKeys] Problems on Proposed Autostart Frequency 
> 10.133
>
>
>> .5 Khz only requires that you have 100Hz tuning which almost all 
>> modern
>> (i.e. 1985 and up!) rigs have.  It all had to do with the original 
>> xtal
>> standards we were all using to 'spot' the frequency way back in the
>> 60's.  If we could do it then, using hammy only stuff, I sure don't 
>> see
>> why we can't do it now using our new modern fancy 'expensive' rigs!  
>> No
>> commerical or military gear needed....
>>
>> Also I might mention, some of the best montoring I ever did, and the 
>> one
>> that attracted the most attention among lots of folks was the the
>> development of the St-6 and the entire Uart series that was done 
>> almost
>> entirely over the air via rtty.  The internet not being invented at 
>> that
>> time!  I'm sorry you don't like technical talk, but then again, 
>> contests
>> bore the heck out of me.  Bottom line is, if you don't want to copy 
>> it,
>> turn your machine off...
>>
>> de jerry -n6jp-
>>
>> ----- Original Message -----
>> From: "Frederick A Sell" <[email protected]>
>> To: <[email protected]>
>> Sent: Thursday, May 06, 2004 9:38 AM
>> Subject: Re: [GreenKeys] Problems on Proposed Autostart Frequency 
>> 10.133
>>
>>
>>> Gang,
>>> I've been lurking for a bit on this "autostart net" project.  I am 
>>> not
>>> that active on the air so I will not be a major player in the net, 
>>> but
>>> some comments:
>>>
>>> A.  NO .5 Kc channels.  Whoever came up with that a while back should
>> be
>>> shot!  It requires people with some commercial and military gear to
>> take
>>> a back seat as some of us do not have "modern" DC to Daylight radios
>> with
>>> 1 cycle readout.  I believe it started with the idea of 2.5 Kc
>> channels
>>> because of typical SSB bandwidth.  Not a bad idea at first thought, I
>>> might not even care if I had a new radio!!
>>> On a similar note I cannot use my only radios capable of 60 meters
>>> because of this "center of channel" bit, lets just use the dial or
>> window
>>> frequency and leave it at that.
>>> B.  10.137 Kc is our (Clatternet) frequency.  Saturday mornings,  
>>> USB,
>>> 850 cycle shift, Mark low.  Net moves to 7087 Kc at times for
>> propagation
>>> reasons.  Like any other freq. these are not "ours" so could be used
>> if
>>> all other options fail.  Please join us if you can, most participants
>> use
>>> military mechanical gear but anything is welcome.
>>> 3.  As others have said, lets not turn this into a tech fest.  If
>> people
>>> what to send "private" messages badly enough let them use e-mail.
>> Lets
>>> just get this vintage stuff on the air, as my friend Chris K6FIB
>> coined
>>> "It's the clatter that matters".
>>>
>>> Another country heard from.
>>>
>>> Thanks for your time,
>>>
>>> Fred Sell  WA7OBB
>>> Corvallis, Oregon
>>>
>>> M28, M15, home built ST-6, Dovetron, TT/L-2 and other odd homebrew 
>>> TUs
>>> snatched from the jaws of the crusher, yet to be resurrected. (Now
>> where
>>> did I leave that polar relay?)
>>>
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>>
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