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From: John Andrews <w1tag@charter.net>
In-Reply-To: <526090AA.20402@iup.uni-heidelberg.de>
Message-Id: <979D354C-D77D-4378-B7D5-ED2C0778842C@charter.net>
Date: Thu, 17 Oct 2013 22:11:53 -0400
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Mime-Version: 1.0 (1.0)
Subject: Re: LF: T/A OPDS DK7FC
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Status: O

Stefan,

Had the first hit at 0149z.  Said -46.5 dB!

John, W1TAG

> On Oct 17, 2013, at 9:36 PM, Stefan Sch=C3=A4fer <Stefan.Schaefer@iup.uni-=
heidelberg.de> wrote:
>=20
> Jay,
>=20
> Correction: Markus created a special file for me which makes the ramp time=
 shorter than 1 ms. So now my PA can send OPDS with Markus' software and i a=
m on air in this mode tonite until 06:15 UTC.
>=20
> Maybe you can detect me?
>=20
> 73, Stefan/DK7FC
>=20
>=20
>=20
> Am 18.10.2013 02:56, schrieb Stefan Sch=C3=A4fer:
>> Hi Jay,
>>=20
>> I wanted to give it a try tonite. First i wanted to use DF6NM's OPDS soft=
ware which i would really prefer over the ROS-OP stuff. But then i found tha=
t the sndoutpt.exe creates a ramp in the audio tone. My FETs didn't like tha=
t at all, they made a crrrk at the beginning and end of each dash. This is b=
ecause the audio passes a comparator which makes a clear hard keyed tone for=
 the mixer which keys the IXDD414 anyway. FETs survived but it showed that i=
 need to do hardware modifications if i want to use Markus' tool.
>> In WSPR-15 it may be the same but then it is just 4 times per hour and in=
 OP32 is is much more.
>>=20
>> Then i installed the standard Opera program which i find very annoying. I=
t is not even possible to select a TXD line of the RS232 which i normally us=
e for PTT. When using the standard program i'm generating the tone with Spec=
Lab (on the "LF TX PC") and key the PTT with the program (on the "LF/MF RX/T=
X PC"). Didn't work :-/ Soldered arround to use RTS instead. PTT was keyed w=
hen pressing the tune button and released when pressing it again, as intende=
d. But then, when pressing "Beacon", the PTT was key down, permanent tone.
>>=20
>> Need a VOX or so...
>>=20
>> So i can do no OPDS tests tonite, sorry.
>>=20
>> 73, Stefan/DK7FC
>>=20
>> PS: I'll continue with DFCW-90 now!
>>=20
>>=20
>>=20
>> Am 17.10.2013 18:00, schrieb jrusgrove@comcast.net:
>>> Stefan
>>>=20
>>> Wasn't expecting you to start transmitting OPDS today ... just a thought=
 for the future. But if you want to, that's okay too.
>>>=20
>>> OPDS32 is capable of of decoding at about -50 dB s/n (relative to SSB ba=
ndwidth).
>>>=20
>>> Your call and grid is easily added at the receiving end.
>>>=20
>>> Jay
>>>=20
>>>=20
>>> ----- Original Message ----- From: "Stefan Sch=C3=A4fer" <Stefan.Schaefe=
r@iup.uni-heidelberg.de>
>>> To: <rsgb_lf_group@blacksheep.org>
>>> Sent: Thursday, October 17, 2013 10:57 AM
>>> Subject: Re: LF: T/A OPDS DK7FC
>>>=20
>>>=20
>>> PS: Jay, Markus,
>>>=20
>>> What is the S/N performance of OPDS compared to WSPR-15 (apart from the
>>> fact that the callsigns must be known in advance and that there is less
>>> information into one sequence) ??
>>>=20
>>> 73, Stefan
>>>=20
>>> Am 17.10.2013 16:55, schrieb Stefan Sch=C3=A4fer:
>>>> Jay,
>>>>=20
>>>> Am 17.10.2013 14:36, schrieb jrusgrove@comcast.net:
>>>>>=20
>>>>> Several stations on this end are now set up to receive OP Deep Search .=
.. including Garry K3SIW in IL. Being that far inland is quite a disadvantag=
e for T/A signal reception compared to 'coastal' stations.
>>>> Garry got several WSPR-15 decodes of me last season, so i think he coul=
d make it in OPDS as well.
>>>>>=20
>>>>> On my end I'm interested to see if it's possible to roll back the earl=
iest T/A reception times (current best of about 2045Z mid season). There are=
 probably other 'unknowns' waiting to be discovered along the way ;~) .
>>>> OK, i can give it a try. Not sure if i can make it today arround 20 UTC=
 but i will try.
>>>> Am i already included in the OPDS list as a possible station?
>>>>=20
>>>> 73, Stefan/DK7FC
>=20