[RTTY] Information please

Barry Murrell ZS2EZ zs2ez at zs2ez.co.za
Mon May 29 03:38:13 EDT 2017 

Joe, my experiences with JTDX versus WSJT-X (particularly on 80m where I
have been active recently) are very different.... although I can only
compare to WSJT-X 1.7, as this is the only AVAILABLE version - I have not
compiled software since Pascal 7 in the 80's, and do not have the time,
knowledge or inclination to stumble around trying to "roll my own"
version... this is why I steer clear of Linux too, WHY the developers of a
program cannot simply provide an installer to test with (like Igor does with
JTDX and Dave W1HKJ does with FLDigi) I will never understand. As far as I
am concerned, WSJT-X 1.7.1 etc is NOT available to the general Amateur
community....

As far as JTDX is concerned :  The Hint function is optional (but works
extremely well), I have found only an EXTREMELY occasional "False Decode"
(which the software flags as Questionable) and the number of decoding passes
are also configurable.

In direct comparison to WSJT-X 1.7, I have found JTDX to be far superior in
decoding of weak signals (regularly completing QSOs with signals of -26, -28
and even -30!), massively better at handling overlapping signals, and it's
Filter feature is AMAZING!

Your mileage may vary, but these are my observations from operating.... as
stated, I have no idea what the UNRELEASED WSJT-X can do, but up against the
RELEASED version JTDX is FAR better!!!

Of course, these observations are from the bottom end of Africa where there
are generally only about 4 or 5 "local" stations on the air at any time -
may be very different when the band is very crowded....

73 de BARRY MURRELL ZS2EZ
KF26ta - Port Elizabeth, South Africa
EPC#0558 DMC#1690 WCC#030 30MDG#4081
DXCC(mixed)#41,146  DXCC(RTTY)#1,916
DXCC(phone)#34,990  DXCC(CW)#11,714
DXCC 40m,30m,20m,17m,15m,12m,10m
WAS Triple Play #492  WAS(RTTY)#538  WAZ(RTTY)#185  WAE-I(mixed)#72
WAZS(mixed)#214  AAA#1569
AS ZR6DXB: VUCC(50MHZ)#1,334  UKSMG WAE(Silver)#75  UKSMG AFRICA#22  WAC
(Satellite)
website : www.zs2ez.co.za


-----Original Message-----
From: RTTY [mailto:rtty-bounces at contesting.com] On Behalf Of Joe Subich,
W4TV
Sent: Sunday, 28 May 2017 4:20 PM
To: rtty at contesting.com
Subject: Re: [RTTY] Information please


On 5/28/2017 9:04 AM, Ed Muns wrote:
 > +1 for JTDX.  The advantages are all on JT65 for HF, not JT9, though.

The issues with JTDX are: 1) the use of "hinted decoding" which uses a list
of known calls and will find them even if they are not present!
2) overly aggressive decoding which produces a very high level of "false"
decodes, 3) lack of "two pass" decoding which "nulls out" a stronger signal
and decodes weaker signals on (nearly) the same frequency.

WSJT-X (particularly in the development branch) is clearly superior to JTDX
and has the advantage of Joe Taylor's direct involvement.

73,

    ... Joe, W4TV


On 5/28/2017 9:04 AM, Ed Muns wrote:
> +1 for JTDX.  The advantages are all on JT65 for HF, not JT9, though.
> 
> 73,
> Ed W0YK
> On May 28, 2017 3:05 AM, Barry Murrell ZS2EZ <zs2ez at zs2ez.co.za> wrote:
>>
>> John, you may want to try JTDX, a derivative of WSJT-X optimised 
>> exclusively for HF by UA3DJY.
>> Unlike WSJT-X (which unless you are prepared to compile your own 
>> version is updated VERY infrequently - last release version is 1.7.0, 
>> while the "Developer" team talk about 1.7.1 with major improvements 
>> which are not generally available) JTDX is constantly updated and 
>> includes it's own mode
>> (JT10) which is becoming quite popular.
>>
>> I find that JTDX is considerably more sensitive on receive (hearing a 
>> number of weak stations much better than WSJT-X) and have regularly 
>> managed QSOs at around -28 and -30!!!
>>
>> The latest JTDX can be downloaded at :
>> https://cloud.mail.ru/public/N4qQ/7RrTSrusu  and more info can be 
>> found at http://www.qrz.lt/ly3bg/JTDX/jtdx1.html
>> It works with JTAlert too!!
>>
>> Well worth trying!!
>>
>> 73 de BARRY MURRELL ZS2EZ
>> KF26ta - Port Elizabeth, South Africa
>> EPC#0558 DMC#1690 WCC#030 30MDG#4081
>> DXCC(mixed)#41,146  DXCC(RTTY)#1,916
>> DXCC(phone)#34,990  DXCC(CW)#11,714
>> DXCC 40m,30m,20m,17m,15m,12m,10m
>> WAS Triple Play #492  WAS(RTTY)#538  WAZ(RTTY)#185  WAE-I(mixed)#72
>> WAZS(mixed)#214  AAA#1569
>> AS ZR6DXB: VUCC(50MHZ)#1,334  UKSMG WAE(Silver)#75  UKSMG AFRICA#22  
>> WAC
>> (Satellite)
>> website : www.zs2ez.co.za
>>
>> -----Original Message-----
>> From: RTTY [mailto:rtty-bounces at contesting.com] On Behalf Of John 
>> Barber
>> Sent: Saturday, 27 May 2017 6:16 PM
>> To: 'W4GKM' <w4gkm at citlink.net>; rtty at contesting.com
>> Subject: Re: [RTTY] Information please
>>
>> If you are already set up for another data mode, using AFSK, it's 
>> simple. I started by downloading JT65-HF, set it up and watched the 
>> results. On most HF bands the radio is set to .076 dial frequency.
>> JT65-HF was disappointing in the user interface and facilities, so I 
>> tried the JT65-HF HB9HQX-Edition improved version, which has been
excellent.
>> John GW4SKA
>>
>> -----Original Message-----
>> From: RTTY [mailto:rtty-bounces at contesting.com] On Behalf Of W4GKM
>> Sent: 27 May 2017 14:58
>> To: rtty at contesting.com
>> Subject: Re: [RTTY] Information please
>>
>> I have never tried these modes, but I would like to, where do I start.
>>
>> Nick
>> W4GKM
>>
>>
>> On 5/26/2017 9:37 AM, Don AA5AU wrote:
>>> JT65 and JT9 and excellent modes. I have over 144 entities worked on
>>> JT65
>> alone and have worked all states on 10-80 meters (need only DE & RI 
>> on 160 and AK, HI & ME on 6 meters.
>>> Last night I worked two Japanese stations on 6 meter JT65 running 80 
>>> watts
>> to a 4-element yagi (3 element SteppIR with passive element added) 
>> and this morning JH0INP confirmed our QSO via LotW. There's lots of 
>> activity on 6 meter JT65 in the summer.
>>> I really like JT modes on 160 meters because I seem to be able to 
>>> work new
>> ones I can't hear on CW. I highly recommend JT65 & JT9.
>>> Don AA5AU
>>>
>>>          From: Bill Turner <dezrat at outlook.com>
>>>     To: RTTY Reflector <rtty at contesting.com>
>>>     Sent: Friday, May 26, 2017 9:11 AM
>>>     Subject: Re: [RTTY] Information please
>>>       
>>> ------------ ORIGINAL MESSAGE ------------(may be snipped)
>>>
>>> On Fri, 26 May 2017 09:20:25 +0100, you wrote:
>>>
>>>> You could think about using the other data modes. With low power 
>>>> and poor propagation, PSK can work a lot better than RTTY.
>>>> The ultimate move across to the dark side is JT65. I started using
>>>> JT65 about 10 days ago and have 60+ countries in the log, operating 
>>>> just a couple of hours a day.
>>>> Very low power is all you need, but it's a horrible slow process 
>>>> with no skill required. My only motivation is to get to 100 DXCC 
>>>> then back to
>> RTTY!
>>>> John GW4SKA
>>> REPLY:
>>>
>>> Even better than JT65 is JT9.  A fraction of the bandwidth and 
>>> according to the author, about 2 dB better with weak signals. The 
>>> protocol is the same. Give it a try, you'll like it.
>>>
>>> 73, Bill W6WRT
>>> _______________________________________________
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>>
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