Re: [Elecraft] New Digital Mode and K3S Frequency Accuracy
On 7/16/2017 10:54 AM, Christopher Hoover wrote: JT65 can decode arbitrary messages down to -24 dB (and certain messages down to -32 dB). When functioning as a multi-decoder, late versions of WSJT-X often give me good decodes in the range of -24 to -29dB re: the full bandwidth noise floor, and they also include second-pass decoding for signals missed during the first pass. It is, for example, common to decode 2-3 responses to the same CQ, all within a few Hz of each other. Second pass decoding subtracts out the decoded signals and then decodes what's left. Particularly impressive was what happened when a W7-area station was calling JA7QVI on 6M, but got out of sync so that he was calling on the same cycle as JA7QVI. Both stations were decoded on consecutive passes, even though the W7-area station was 10-12 dB louder and nearly zero beat! JT65 often decodes signals that overlap each other. FT8 does not, but FT8 signals only occupy about one-quarter the bandwidth of a JT65 signal. 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] New Digital Mode and K3S Frequency Accuracy
Just a note guys, Myself and many others are on 630 meters every night.John ( WH2XIQ) and Myself (WG2XXM) made the first FT8 qso on 630 m .The mode is very fast almost to fast hi hi.Set your dial to 474.2 upper side band or digi mode , my signal will be @ 1510 hz.on the wspr water water fall.73 all Ken K5DNL/WG2XXM On Sunday, July 16, 2017 12:53 PM, Fred Jensen wrote: Just kidding Jim, I exercised several of the WSJT modes some time back and was amazed at the copy on signals I simply couldn't hear [although generally, most were strong enough to hear]. With the new synth, I even got up in the middle of the night to see if I could hear the signals WSPR was decoding on 474 Kcs, but never heard a peep. The constrained QSO format of JT65/JT9 and the time it took just wasn't attractive for me. To each his own. 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County On 7/16/17 10:28 AM, Jim Brown wrote: > On 7/15/2017 6:58 PM, Fred Jensen wrote: >> 15 sec vs 47 sec is a 68% decrease in QSO time. So, I only have to >> wait for 32% of the paint to dry? [:-) > > Hi Fred, > > I spent a lot of time with FT8 yesterday in CQ VHF, and found it to be > pretty fast paced. I'd say the rate was at least as good as QRP SSB > during a DX contest! I made 47 QSOs yesterday, only one on SSB, none > on CW. The FT8 window was jumping as long as the band was open, and > I'd guess that at least half of the QSOs would not have been possible > on SSB, and many not on CW. And I picked up four new grids. > > 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to kwrober...@yahoo.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] New Digital Mode and K3S Frequency Accuracy
On Sat, Jul 15, 2017 at 4:05 PM, Bob McGraw K4TAX wrote: > it decodes about 20 dB deeper than previous versions. > That's not right. FT8 can decode down to -20 dB (AWGN channel). JT65 can decode arbitrary messages down to -24 dB (and certain messages down to -32 dB). JT9 is 2 db more sensitive than JT65. 73 de AI6KG __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] New Digital Mode and K3S Frequency Accuracy
Just kidding Jim, I exercised several of the WSJT modes some time back and was amazed at the copy on signals I simply couldn't hear [although generally, most were strong enough to hear]. With the new synth, I even got up in the middle of the night to see if I could hear the signals WSPR was decoding on 474 Kcs, but never heard a peep. The constrained QSO format of JT65/JT9 and the time it took just wasn't attractive for me. To each his own. 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County On 7/16/17 10:28 AM, Jim Brown wrote: On 7/15/2017 6:58 PM, Fred Jensen wrote: 15 sec vs 47 sec is a 68% decrease in QSO time. So, I only have to wait for 32% of the paint to dry? [:-) Hi Fred, I spent a lot of time with FT8 yesterday in CQ VHF, and found it to be pretty fast paced. I'd say the rate was at least as good as QRP SSB during a DX contest! I made 47 QSOs yesterday, only one on SSB, none on CW. The FT8 window was jumping as long as the band was open, and I'd guess that at least half of the QSOs would not have been possible on SSB, and many not on CW. And I picked up four new grids. 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] New Digital Mode and K3S Frequency Accuracy
On 7/15/2017 6:58 PM, Fred Jensen wrote: 15 sec vs 47 sec is a 68% decrease in QSO time. So, I only have to wait for 32% of the paint to dry? [:-) Hi Fred, I spent a lot of time with FT8 yesterday in CQ VHF, and found it to be pretty fast paced. I'd say the rate was at least as good as QRP SSB during a DX contest! I made 47 QSOs yesterday, only one on SSB, none on CW. The FT8 window was jumping as long as the band was open, and I'd guess that at least half of the QSOs would not have been possible on SSB, and many not on CW. And I picked up four new grids. 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] New Digital Mode and K3S Frequency Accuracy
All modes have their uses and popularity.
With FT8 one may initially find it easier to use by unticking the auto sync
box ?
I have been really enjoying this new mode 😊
73
Rob G3RCE
On Jul 16, 2017 02:59, "Fred Jensen" wrote:
Sorry, can't resist. 15 sec vs 47 sec is a 68% decrease in QSO time. So,
I only have to wait for 32% of the paint to dry? [:-)
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 7/15/17 4:05 PM, Bob McGraw K4TAX wrote:
> I know many of you are a CW die hard, but have you tried the new digital
> mode FT-8? It is from Joe Taylor, WSJT-X version 1.8.0-rc1. Easy to get
> up and running. Specially a breeze with the K3S and its USB
> communications. It makes JT-65 and other modes appear like watching an
> Oak tree grow. The T/R times are 15 seconds and it decodes about 20 dB
> deeper than previous versions.
>
> It also has a very nice receiver calibration mode. I find that on most
> bands my K3S is reported to have less than 1/2 Hz error. {Big smile!}
>
> 73
>
> Bob K4TAX
>
> K3S s/n 10163
>
>
> On 7/15/2017 10:21 PM, Jessie Oberreuter wrote:
>
>>
>> Max,
>>
>> I know the feeling. We're also in the middle of the CQ VHF Contest
>> :).
>>
>> Wayne,
>>
>> Thanks for the nice qso on 15 :). It was a nice little break from
>> spinning the beams and working the noise on 6 & 2 :). SubRx in the K3 makes
>> it easy to listen omni and beam at the same time :).
>>
>>
>>
>> On Sat, 15 Jul 2017, M. George wrote:
>>
>> Wayne, the NAQP RTTY contesting going on... it started at 1800Z today. It
>>> goes for 12 hours. There are a lot of signals on 15 meters, about half
>>> as
>>> many as I'm seeing on 20 meters here in Utah.
>>>
>>> Max NG7M
>>>
>>> On Sat, Jul 15, 2017 at 2:04 PM, Wayne Burdick
>>> wrote:
>>>
>>> Hi all,
Based on info from dxmaps.com, 15 meters should be open. Hearing a few
signals.
If you’d like to participate in a 15 meter “flash mob” experiment,
please
drop by on 21040 +/- 5 kHz. Initially, callsigns ending in A-L listen,
M-Z
call CQ (myself included).
Not a contest, no rules, no award credit, just an excuse to get on the
air.
73,
Wayne
N6KR
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>>>
>>>
>>>
>>>
>>> --
>>> M. George
>>> __
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>>
>>
>> __
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>
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Re: [Elecraft] New Digital Mode and K3S Frequency Accuracy
Sorry, can't resist. 15 sec vs 47 sec is a 68% decrease in QSO time.
So, I only have to wait for 32% of the paint to dry? [:-)
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 7/15/17 4:05 PM, Bob McGraw K4TAX wrote:
I know many of you are a CW die hard, but have you tried the new
digital mode FT-8? It is from Joe Taylor, WSJT-X version 1.8.0-rc1.
Easy to get up and running. Specially a breeze with the K3S and its
USB communications. It makes JT-65 and other modes appear like
watching an Oak tree grow. The T/R times are 15 seconds and it
decodes about 20 dB deeper than previous versions.
It also has a very nice receiver calibration mode. I find that on
most bands my K3S is reported to have less than 1/2 Hz error. {Big
smile!}
73
Bob K4TAX
K3S s/n 10163
On 7/15/2017 10:21 PM, Jessie Oberreuter wrote:
Max,
I know the feeling. We're also in the middle of the CQ VHF
Contest :).
Wayne,
Thanks for the nice qso on 15 :). It was a nice little break
from spinning the beams and working the noise on 6 & 2 :). SubRx in
the K3 makes it easy to listen omni and beam at the same time :).
On Sat, 15 Jul 2017, M. George wrote:
Wayne, the NAQP RTTY contesting going on... it started at 1800Z
today. It
goes for 12 hours. There are a lot of signals on 15 meters, about
half as
many as I'm seeing on 20 meters here in Utah.
Max NG7M
On Sat, Jul 15, 2017 at 2:04 PM, Wayne Burdick
wrote:
Hi all,
Based on info from dxmaps.com, 15 meters should be open. Hearing a few
signals.
If you’d like to participate in a 15 meter “flash mob” experiment,
please
drop by on 21040 +/- 5 kHz. Initially, callsigns ending in A-L
listen, M-Z
call CQ (myself included).
Not a contest, no rules, no award credit, just an excuse to get on
the air.
73,
Wayne
N6KR
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--
M. George
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