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TOPIC: rtty offset not able to set

rtty offset not able to set 18 Oct 2020 09:27 #1

  • ic8pof
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HI am playing around in the rtty jarts contest right now but I am not able to have working the RTTY_OFFSET.
the tuning is out of about 85Hz between my direct listening on my FT1000Field and the Colibrinano.
Any number I put in the SKM setup offset field no action is carried in the tuned station on the spectrum window.
Have tried either with skm server on and off but no action is performed.
any suggestion pse ?
the SDC version is 12.24.x64
Phil
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rtty offset not able to set 18 Oct 2020 09:36 #2

  • g0cgl
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  • Erik EI4KF / G0CGL
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I do not know the answer, Phil, as its working fine here and I cannot think of a reason for your issue. But even though unlikely to change anything, you might try the latest SDC in case that helps.

sdc.qrz.ru/installers_beta/SDC_12.2505x64_setup.exe

If issue persists, you can email Yuri in English language.
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rtty offset not able to set 18 Oct 2020 09:41 #3

  • ic8pof
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GM Erik, just one question: should the skimmer MUST halted to write the offset or it is irrilevant being on or off ? anyway going to try the link you are suggesting
tnx
Phil
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rtty offset not able to set 18 Oct 2020 09:53 #4

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HI again sri nothing happens also with the v.12.2505
the only way is to activate the Colibri RIT with -85Hz, but when I move the TRX tuning the RIT remains on the previous QRG....strange
Phil
Last Edit: 18 Oct 2020 10:04 by ic8pof.
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rtty offset not able to set 18 Oct 2020 10:09 #5

  • g0cgl
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It is strange - I can change the offset with both skimmer on or off. But I do not have the Colibri, maybe there is a difference because of that model. I really do not know. You need an "expert" hi - Roman or Yuri - to help.
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rtty offset not able to set 18 Oct 2020 10:27 #6

  • ic8pof
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one more doubt: the RTTY OFFSET works only on the position of the SPOT over the Colibri_Spectrum or it moves ALSO the CAT ie the tuning of the radio ?
I do not see neither one nor the other on the spectrum.
The difference of -85Hz comes out when I switch from my radio tuned audio (RTTY_FSK) and the tuned audio of the Colibri
this is one more question to the Developers.
Phil
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rtty offset not able to set 18 Oct 2020 11:11 #7

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So - are you using a FSK hardware decoder only? If so, that would explain it. The offset is to compensate for the panorama position of the signal when using AFSK with a compatible RTTY/Log such as 5M which otherwise would be 85Hz off. If I understand your setup (and I might not hi), utilising the offset will have zero effect.
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rtty offset not able to set 18 Oct 2020 16:20 #8

  • ic8pof
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GA Erik, you are right. I use FSK in TX and MMTTY HighTones in RX all chained via CAT.
I am using FSK since ever in my FT1000Field and the programs are the Logger32 and the N1MM.

I have used for many years the RFSPACE_SDR_IQ + SDR_Console of SimonBrown in version 1.5 in WIN_XP and was ok; in the last versions(above v2) Simon
hasn't upgraded the RTTY tuning so I was unable to use this mode in WIN_7 with it.

In the last couple of years has come on a new option in N1MM_log : WATERFALL_BandScope and with the SDR_IQ it has worked fine .
There is an option in the CAT_Driver to take care of the OFFSET(it was some 250 Hz off) and once set you forget to have it.
Point&click into the SPECTRUM is straightforward.

Of course the audio differs of exactly -85Hz in tuning the TRX audio and then switching to the ColibriNano, but I suppose this OFFSET must be done
at the CAT level .
For a casual QSO it would be ok switching ON the RIT in the ColibriNano, but for contest mode there is a more stringent way of running
around the spectrum...without losing time to RESYNC the QRG.

Of course the ColibriNano & SDC_Skimmer combo is far more attractive.

Let us wait and see if the Developers would take care of this point.

Phil
Last Edit: 18 Oct 2020 16:22 by ic8pof.
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rtty offset not able to set - correction OFFSET is ok 26 Oct 2020 17:39 #9

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HI All, after tweaking and mumbling around for some time I have realized that the OFFSET in the SDC program works ok.
I have thought (wrong) that this OFFSET should work on the CAT side but no it works just in the SDC_SKIMMER part.
The small amount of OFFSET between my TRX and the Colibri_Nano has been corrected in the EESDR_Options_Device_Calibration_Expert.
An idea for the developers: in the Device_Expert_Calibration TAB add a memory or just a Text_Memo to write the OFFSET needed so
is possible to change the small amounts of differences between TRX and the SDR more easier than now.
In my case CW has about 20Hz and RTTY about 85Hz to keep synced the TRX and the ColibriNano.
73
Phil
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rtty offset not able to set - correction OFFSET is ok 27 Oct 2020 07:30 #10

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It is not on CAT, you are correct. But making that adjustment in EESDR2 will mean that your receiver is now inaccurate on other modes. If you only use RTTY it will not matter but important to consider if using CW and to a lesser extent SSB.
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