Message-ID: <20090505221513.oso5g5yn6csgwsw4@webmail4.kuleuven.be>
Date: Tue, 05 May 2009 22:15:13 +0200
From: Rik Strobbe <Rik.Strobbe@fys.kuleuven.be>
To: rsgb_lf_group@blacksheep.org
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Faint traces of my signal are showing up on the G4WGT grabber.
I will transmit every 10 minutes starting 20:40 UTC until 21:30 UTC =20
and listen inbetween.

73, Rik  ON7YD - OR7T

Quoting Rik Strobbe <Rik.Strobbe@fys.kuleuven.be>:

> Hello Gary, LF,
>
> I just had a first transmission.
> I will try short transmissions every 10-15 minutes or so until my
> signal shows up un your grabber. Then I will start longer transmissions.
>
> 73, Rik  ON7YD - OR7T
>
> Quoting Gary - G4WGT <g4wgt@tiscali.co.uk>:
>
>> OK Rik,
>>
>> I will look at the settings you describe in MTTY to allow me to monitor,=20=
I
>> normally use TrueTTY.
>>
>> Thanks for the info.
>>
>> Cheers,
>>
>> Gary - G4WGT.
>>
>> -----Original Message-----
>> From: owner-rsgb_lf_group@blacksheep.org
>> [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Rik Strobbe
>> Sent: 05 May 2009 16:26
>> To: rsgb_lf_group@blacksheep.org
>> Subject: RE: LF: RE: rtty test
>>
>> Gary, LF,
>>
>> I just had a look at MMTTY and it seems pretty easy to set it to 50Hz
>> shift and 22Bd baudrate.
>> The way I did it:
>> 1. As a start select 23Hz RTTY (in "Profiles")
>> 2. In "Options" select "Setup MMTTY"
>> 3. In the tab "Demodulator" change "Shift" from 23 tot 50 (it is not
>> a standard option, but you can just type 50 into the field)
>> 4. In the tab "Demodulator" change "Mark" to a suitable value (that
>> is the audio frequency you get)
>> 5. In the tab "Demodulator" change "Discriminator Type" from VCO to FIR B=
PF
>> 6. In the tab "Demodulator" change "Tap" from 72 to 256
>> 7. In the tab "Demodulator" click on "OK"
>> 8. In the tab "Decode" change "BaudRate" from 45 tot 22 and click "OK"
>> Steps 5-7 set demodulator type, the values above are the result of
>> some brief dry tests and can most likely still be optimized. You can
>> do that in the main screen.
>>
>> If WX permits (no rain) I intend to run some tests between 20:30 and
>> 21:30 UTC on 503.5kHz in mode USB (so if you listen in LSB don't
>> forget to select reverse mode).
>> I will announce the exact hours later this evening.
>> Between transmissions I will listen on the same frequency.
>>
>> All reports (or replies) are welcome.
>>
>> 73, Rik  ON7YD - OR7T
>>
>> At 14:14 5/05/2009, you wrote:
>>> Hello Gary,
>>>
>>> I had a closer look at the 23Hz shift option of MMTTY and it seems
>>> to run at 45Bd what is on the edge regarding the shift/baudrate
>>> ratio. That is most likely the reason why it is not so robust.
>>> Using 45Bd at 85Hz shift would exceed the 100Hz bandwidth limit.
>>> I guess the best option for RTTY would be a shift around 50Hz and a
>>> lower baudrate (say 20Bd) what would well fit within the 100Hz
>>> bandwidth and would have a sufficient shift/baudrate ratio to
>>> provide a robust signal.
>>> I will see if I can get such signal out of MMTTY and - if time
>>> permits - run some tests tonight.
>>>
>>> 73, Rik  ON7YD - OR7T
>>>
>>> At 12:22 5/05/2009, you wrote:
>>>> Hi Rik,
>>>>
>>>> You have experienced the same as I did with 23Hz shift, the signal need=
s
>> to
>>>> be very strong to decode. It was in the last 2 minutes that I got the
>>>> partial decode.
>>>>
>>>> A much better shift to use is the 85Hz which will fit into your spec.
>>>>
>>>> I have had good QSO's with Chris G3XIZ in Biggleswade both of us using
>> 85Hz.
>>>>
>>>> Give that a try next time & I believe I will get a much better decode
>>>> judging by the strength of your signal.
>>>>
>>>> 73
>>>>
>>>> Gary - G4WGT.
>>>>
>>>> -----Original Message-----
>>>> From: owner-rsgb_lf_group@blacksheep.org
>>>> [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Rik Strobbe
>>>> Sent: 04 May 2009 22:37
>>>> To: rsgb_lf_group@blacksheep.org
>>>> Subject: Re: LF: RE: rtty test
>>>>
>>>> Hello Gary,
>>>>
>>>> call the is almost right, locator completely.
>>>> But not really impressive for 500mW ERP.
>>>> I could see my signal on your grabber, some slow QSB but strong for
>>>> the last 2 minutes or so.
>>>> I used MTTY with the profile "23Hz RTTY (MTTY)" without any further
>>>> changes, not sure that this is the best mode.
>>>> So any advice is welcome.
>>>> I have also installed MultiPSK, but am still overwhelmed by the colors
>>>> and options.
>>>> I am allowed to use any digital mode as long as I stick to max. 100Hz
>>>> bandwidth.
>>>>
>>>> 73, Rik  ON7YD - OR7T
>>>>
>>>>
>>>>
>>>> Quoting Gary - G4WGT <g4wgt@tiscali.co.uk>:
>>>>
>>>>> Hi Rik,
>>>>>
>>>>> This is the best I could do, it looks like almost your call sign &
>> locator
>>>>> :-
>>>>>
>>>>> RHTQHTST DE TC(TIOJ7T OR1T JO20IX
>>>>>
>>>>> 73
>>>>>
>>>>> Gary - G4WGT.
>>>>>
>>>>> -----Original Message-----
>>>>> From: owner-rsgb_lf_group@blacksheep.org
>>>>> [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Rik Strobbe
>>>>> Sent: 04 May 2009 21:10
>>>>> To: rsgb_lf_group@blacksheep.org
>>>>> Subject: LF: rtty test
>>>>>
>>>>> dear all,
>>>>>
>>>>> I will run a short (10 minute) rtty test (23Hz shift) on 503.500 at
>> 21UTC
>>>>> Reports and/or reply welcome.
>>>>>
>>>>> 73, Rik  ON7YD - OR7T
>>>>>
>>>>>
>>>>>
>>>
>>
>>
>>
>>