[hpsdr] Tiny Demeter / Time zones

[Jeroen Bastemeijer]

Eric (and others),

Thank you for your E-mail! I have been listening to the recordings of 
team-speak for about a year now. Indeed the discussions are very 
interesting.

Allthough I'm very often away in the weekends (busy with the 
Scouting/Scout movement) a time somewhere Saturday evening (local time, 
the Netherlands (UTC +1 Hour or 2 Hours)) would be convenient. As the 
HPSDR project is worldwide, it would be nice to know where the 
participants live. Especially in which timezone. Once we have such an 
overview a good proposal could be made for a (or another) teamspeak session.

On the other hand, the recordings of the Teamspeak sessions are very 
valuable (thank you Mike!). The only drawback for a project leader is 
that he/she(?) is missing an opportunity to discuss his/her project. 
Everything should be done by mail or the HPSDR-site.

For now, next thing I will do is downloading the latest teamspeak file 
and listen to the recording. I'm very curious if there was any 
discussion about (Tiny) Demeter.... I will get back to you all,

73 Jeroen PE1RGE



Eric Ellison schreef:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Jeroen
>
> Great! Scotty and I had a really FUN time discussing this. What Scotty was
> planning made a LOT of sense, and probably could be very 'quiet' and
> powerful enough to handle a lot, and plug into the Atlas connector directly.
>
>
> You are right! Although it is NOT meant to circumvent this list, and is
> almost ALWAYS recorded, Teamspeak can LEAP things forward by 'rapid'
> collaboration. There is MOST definitely a problem with Timezones. TAPR,
> AMSAT, Digital Voice, Astronomy, and other core groups and others use the
> resource productively and Collaborate all the time. The good thing is that
> you DID listen to the audio and posted comments back to the list, so others,
> if they are interested, can go back and listen.
>
> Actually Phil, Bill, and other HPSDR project leaders, are there virtually
> every week on Sat 01:00 UCT, since the beginning over 3 years ago. It is
> probably the best place to get updates on almost every active HPSDR project!
> And make contributions. I think the 15 to 25 diehards who come every week or
> couple of weeks, are attracted, now, by being able to interact or even
> listen to the fantastic HPSDR discussions between Phil  and Bill. Phil is a
> fantastic designer and even more fantastic educator! He DOES slow down for
> 'turtles' like me, and patiently answers even the most elementary of
> questions!
>
> I would be glad to sponsor a more "EU friendly" time to discuss HPSDR
> projects on Saturday (Early Daytime Eastern Daylight time) if anyone is
> interested. If we do this It would probably be best to favor all US
> timezones and no later than early evening EU on Saturday. I'm open to
> suggestion, and will try to be there.
>
> As a side note, although I am not quite ready to moderate discussion, I am
> planning to get the Pandora project going again. Ben - KD5BYB for very
> understandable personal reasons has communicated that he has had to back
> down as active project leader. This IS open to new project leadership. I
> feel the project is/was quite 'mature' in concepts. There might be someone
> else to take over the project leadership. I will 'stand-in' until someone
> would like to claim project leadership. I talked with Bob - N5BRG at Dayton
> who has SolidWorks designs for the project which he was working with Ben as
> it stands. We are having a few problems publishing the files.
>
> HPSDR is Fertile!! You fantastic contributors are 'cultivating' it for a
> fantastic yield! (I'm a farmer at heart!)
>
> Thanks
> Eric - AA4SW
>  
>
>
>
> -----Original Message-----
> From: hpsdr-bounces at lists.hpsdr.org [mailto:hpsdr-bounces at lists.hpsdr.org]
> On Behalf Of Jeroen Bastemeijer
> Sent: Wednesday, June 04, 2008 4:47 PM
> To: hpsdr at lists.hpsdr.org
> Subject: [hpsdr] Tiny Demeter
>
> ***** High Performance Software Defined Radio Discussion List *****
>
> Dear All,
>
> I was delighted to hear the name "Demeter" again in the Teamspeak 
> sessions! About a year ago I started a design for the HPSDR power 
> supply. At that time a lot of things were not clear. E.g. how much power 
> is needed, which voltages are really needed to run the HPSDR system.
>
> Due to a lack of time the project moved to the background, however, it 
> never "left" my mind. Continuously I have been searching for 
> information, talking to people, reading publications. Now I finished a 
> number of projects, both work-related and private, I can afford to spend 
> more time on the Demeter project! Because the HPSDR system is getting 
> more mature, it is getting more clear what the demands are for the power 
> supply for the HPSDR.
>
> During the past months, I found out that a switcher can be succesfully 
> used when carefully designed. Furthermore, a good linear regulator can 
> be constructed far better from discrete component (compared to an 
> integrated IC-regulator). Another pro, a discrete regulator will give 
> more flexibility in terms op maximum current (e.g. by adding extra 
> regulating transistors).
>
> In the last Teamspeak-session there was some discussion about a small 
> "experimenters" power supply, to be used in the meantime until Demeter 
> becomes available. I would be very happy if I could offer my help in 
> designing a "Tiny Demeter" (and maybe try some simple concepts?!). 
> However, I found, by listening to the teamspeak sessions, that talking 
> to each other gives better results than sending numerous E-mails. Due to 
> my location (the Netherlands) and time-zone it is difficult to attend 
> the Team-speak sessions. Maybe someone on the list is willing to bring 
> in the Tiny Demeter and Demeter in the discussion to find out what the 
> requirements and wishes are for these units.
>
> As far as I can see the 3.3Volt regulator is not necessary, as each 
> board is creating its own 3.3 and 1.8Volts from the 5 Volts. Maybe, this 
> could be a discussion in the coming Teamspeak session. Another thing 
> which should be defined are the current-requirements for each supply 
> voltage.... I'm very curious if we are able to give a sensible answer to 
> this question at this moment. ;-)  For the power requirements we should 
> disregard any "big" RF power amp, as this probably get its own regulator.
>
> Looking forward to reactions from the list! Hope to get the (Tiny?) 
> Demeter project really going now!
>
> For now, 73 Jeroen PE1RGE
>
>   

-- 
Ing. Jeroen Bastemeijer

Delft University of Technology
Department of Electrical Engineering
Electronic Instrumentation Laboratory
Mekelweg 4, Room 13.090
2628 CD Delft
The Netherlands

Phone: +31.15.27.86542
Fax: +31.15.27.85755
E-mail: J.Bastemeijer at TUDelft.nl
GPS: Lat N52.00002 Lon E4.37157 Alt 46.2m


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