[Elecraft] Lids running RTTY on the JT65 Frequency

[Matt VK2RQ]

Of course, it is arguable to what extent JT-65 represents a “true QSO” — the following articles make for some interesting reading, and show that the situation is not altogether back and white:
http://www.sm2cew.com/jt65.html <http://www.sm2cew.com/jt65.html>

73, Matt VK2RQ
 

> On 14 Jan 2015, at 6:39 am, Edward R Cole <kl7uw at acsalaska.net> wrote:
> 
> When Harry first posted
> >On 1/5/2015 5:50 PM, Harry Yingst via Elecraft wrote:
> > JT65 is indeed audible and has a very distinct sound.
> 
> I was tempted to reply when first posted but decided it wasn't worth bothering since it was obviously from someone who totally did not understand.  But now it has been repeated, so you asked for this (and I am replying politely):
> 
> If you stand next to a horn being played, does it make a sound?...if you are a thousand miles away from the horn does it still make a sound?  Yes to both questions.  But can you hear the sound when you are a thousand miles away?  Not by ear.
> 
> Is CW audible in a radio receiver tuned to receive it?  Yes - If the signal is strong enough.  If you cannot hear the CW signal can you copy the CW message...nope.
> 
> JT-65 can be heard by a receiver set up in CW or SSB and properly tuned...if the signal is strong enough.  If the signal is not strong enough to be heard, the JT65 signal can still be decoded (quite easily) though you will hear nothing in the receiver.  This is at a signal level from about -20 to -28 dB SNR as received with a 2.5-KHz bw SSB receiver.
> 
> To state this a little differently, JT-65 can be decoded down to about 8-dB below the signal level that CW is not longer audible.  JT-65 and CW are equally audible if the same signal strength.
> 
> 73, Ed - KL7UW
> PS: if you do not like computers why are you using one to post e-mail?  If you prefer CW, then by all means use CW.  JT-65 is simply an alternative mode which works better with extremely weak signals.  Human intervention is required for either mode.  To say JT-65 use is not human-to human is insulting the user.
> 
> -------------------------
> From: "Wes (N7WS)" <wes at triconet.org>
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] Lids running RTTY on the JT65 Frequency
> Message-ID: <54B55338.1040007 at triconet.org>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> 
> Well, if it's audible, then why not use CW?  Much faster, even with slow keying,
> and they are human-to-human contacts.  The bragging I've heard is of the type,
> "I worked VK0H with 100 mW into a wet string antenna laying on the ground.  Who
> needs QRO?"
> ==snip
> X.
> 
> 
> 
> 73, Ed - KL7UW
> http://www.kl7uw.com
>    "Kits made by KL7UW"
> Dubus Mag business:
>    dubususa at gmail.com
> 
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