[RTTY] SO2R

[Jeff AC0C]

The number of time sent really depends on a lot of things.  If you have a 
big signal and are running high power, then it's easier to get away with a 
single instance of sending the guy's call sign because the average S&P guy 
is going to get solid correct copy most of the time.  The risk is that on a 
weaker signal you don't know if it's the prop that is the problem or if he's 
running QRP into a coat hangar (so you are solid copy to him).

73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie

-----Original Message----- 
From: Ken K6MR
Sent: Monday, September 28, 2015 3:17 PM
To: rtty at contesting.com
Subject: Re: [RTTY] SO2R

I’m still relatively new at this so the answer to this question may be “we’ve 
always done it this way…”

After GM3XXX sends his exchange, why do you send his call again (GM3XXX TU 
M7T QRZ) ? You sent his call, he responded, so you have the call correct. 
Seems like wasted bits and time. And if that TU message gets garbled the 
other station might think you have the call wrong.  A simple TU M7T QRZ 
would appear to be enough.

I see most people do it (I don’t) but I don’t see the reason.

Ken K6MR




From: David G3YYD
Sent: Monday, September 28, 2015 12:24
To: rtty at contesting.com
Subject: Re: [RTTY] SO2R


As a SO2R operator the CQ call is key. If made too short, for instance CQ 
M7T, then it does not give enough time for a complete reply to my CQ call on 
the other radio to be made. The idea is to time it so as soon as one radio 
has finished it is time to transmit on the other.

As a consequence I use CQ M7T M7T M7T CQ this gives sufficient time for 
someone to call me on the other radio with GM3XXX GM3XXX. Then there is no 
apparent delay in my answer to GM3XXX and it allows me to send GM3XXX 59914 
GM3XXX, While someone is calling me on the other radio in response to my CQ 
call.

Of course it falls apart if someone calls me after a CQ with M7T M7T de 
GM3XXX GM3XXX GM3XXX PSE K which unfortunately too many people do. I know my 
call so please do not send it and de is a total waste of time as for PSE K 
enough said. If you have a call that is GM3XXX then twice is sufficient if 
you have a short callsign like my contest call then M7T three times is OK.

Then at the end of the contact I reply GM3XXX TU M7T QRZ again sufficiently 
long to enable someone to call me on the other radio or send the exchange so 
I can reply to them without any apparent delay.

I also make use of the ESC key to cut short messages on a radio so I can 
initiate the reply on the other radio faster. So for instance CQ maybe 
truncated so it becomes CQ M7T M7T.

By the way if you think SO2R is complex then I also operate the radios 
second receivers as well when a contest slows up.

73 David G3YYD aka M7T in contests

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