[GreenKeys] Special Halloween Broadcast

[Ralph Mowery]

My thinking also Duncan,

The first message got me thinking a special frequency on the radio was set up around 13 MHz.  

Then with  the audio tone of 1313, I doubted many would be able to print that to a mechanical printer as you mentioned
Most  converters are not able to demodulate that frequency.

I have not checked MMTTY to see if it can be set to a mark of 1313 Hz.  Or any other computer programs.

If Jordan wants to sent at 1313 hz that is fine, but he should also follow up with the same message using standard tones.
The majority of people will only be able to use the 2125 mark frequency feeding the mechanical printers.

Ralph , ku4pt



-----Original Message-----
From: greenkeys-bounces at mailman.qth.net [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Duncan Brown
Sent: Thursday, October 31, 2019 12:56 PM
To: greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] Special Halloween Broadcast

Jordan,

Thanks for setting up this Halloween broadcast, but I'm afraid very few 
people will be able to copy it due to your unique tone frequencies.

Many (if not most) AFSK converters utilize fixed frequency filters for 
demodulation. Even software programs, such as MMTTY, will not copy your 
1313/1483 Hz AFSK tones.

Next time, it would be best to stick to the "standard" 170 Hz shift 
tones of 2125/2295 Hz.

Have fun,

Duncan
K2OEQ

On 10/31/2019 12:20, Jordan Spencer Cunningham wrote:
> A test message will be transmitted at the previously defined address 
> (http://tty.nerdology.org:8000/livetty) approximately every 15 minutes 
> from now leading up to the broadcast for you to ensure your equipment 
> is tuned accordingly. This is new to both you and me, and I'm using an 
> unusual mark/space frequency. If it was't clear, 1313 was chosen due 
> to 13's association with all things odd and macabre to keep with the 
> tradition of the holiday-- just a small detail to enhance today's 
> experience purely for fun, though I fear it may be causing more angst 
> than it is worth.
>
> I'm glad to receive any feedback to improve future broadcasts as I am 
> clearly out of my league when it comes to radio and RTTY. And probably 
> everything else.
>
> -
> Jordan Spencer Cunningham
> teletype.net <https://teletype.net>
>
>
> On Wed, Oct 30, 2019, at 12:49 PM, Jordan Spencer Cunningham wrote:
>> Correction! Mark frequency will be 1313 *Hz* with a 170 *Hz* shift 
>> (1483 space). NOT MHz.
>>
>> Having worked in IT for years before I started dabbling in AFSK, I 
>> naturally think in measures of MHz and GHz and absentmindedly used 
>> MHz here.
>>