Re: [amsat-bb] New amateur satellite ideas

["Ric Letson, NB2E" <rletson@xxxxxxxxxxxx>]

Emily & The Group,


I can't say for sure but I believe the USRP that John was speaking of is 
the Universal Software Radio Peripheral, of which more information can be 
found at http://comsec.com/wiki?UniversalSoftwareRadioPeripheral

If not I'm sure John will correct me.


Ric Letson, NB2E
rletson@twcny.rr.com



At 01:11 AM 8/2/2004, Emily Clarke wrote:
>Hi John,
>
>Please. please - this is not critical.....
>
>As much as you are very close to the alphabet soup (and you shoud be) 
>perhaps you should explain to the masses what a "TDM bent pipe" is, and 
>what you mean by (ADC/DAC/FPGA/MSU/USB) is.  I think I know all the 
>acronyms except USRP, but perhaps we can get them entered into the AMSAT 
>glossary (http://www.amsat.org/amsat-new/information/glossary.php) so us 
>mere mortals can figure it out?
>
>Thanks,
>
>Emily
>
>PS - Send it to me - I'll be happy to be the clerk.
>
>
>
>
>
>At 04:33 AM 8/2/2004 +0000, John B. Stephensen wrote:
>>Development projects with engineers geographically dispersed are especially
>>difficult to manage and 20 MBPS is ambitious for an amateur HEO 
>>satellite.  If
>>this is still the TDM bent pipe approach, acheiving the necessary EIRP at low
>>cost at the ground station will be a challenge. I had a few email 
>>exchanges with
>>Phil a year or more ago about accomodating small earth stations and TDM 
>>vs FDM
>>on the uplink.
>>
>>The DCP-1 is very similar to the USRP -- the main difference is a 32-bit MCU
>>rather than an 8-bit MCU. My goal was to get the cost as low as possible 
>>so that
>>more people could afford to duplicate it. The sampling rate is 24.576 MBPS
>>adjustable +/-90 PPM and the maximum bandwidth of the analog front end 
>>board is
>>5.8 MHz. The lower sampling rate means that the basic chip set
>>(ADC/DAC/FPGA/MCU/USB) is $50 in small quantities.
>>
>>I'll look into attending the meeting.
>>
>>73,
>>
>>John
>>KD6OZH
>>
>>----- Original Message -----
>>From: "Robert McGwier" <rwmcgwier@comcast.net>
>>To: "John B. Stephensen" <kd6ozh@amsat.org>; <amsat-bb@amsat.org>
>>Sent: Monday, 02 August, 2004 01:26 UTC
>>Subject: RE: [amsat-bb] New amateur satellite ideas
>>
>>
>> > Without going into a tremendous amount of detail why, etc., for the
>> > time being,  I am in charge of transponders for Eagle.  Others are
>> > holding positions or have positions of project technical leadership,
>> > and project management and I for one hope that all shakes out and
>> > settles down before the annual meeting.  Phil, Tom Clark, Rick
>> > Hambly, and I presented a top level view of what we might do for
>> > a useful digital transponder for C band and what it might ental.  There is
>> > a lot of work to be done on the ground elements as well as the
>> > spacecraft elements.  The reasons for my being shoved forward
>> > with a electric cattle prod in my back for the transponders will
>> > become clearer as the project leadership tells the story of where
>> > we are headed for now, and that is likely to be at the annual
>> > meeting.  Suffice it to say, it is ambitious, it is forward looking,
>> > and the team appears to be excellent with new faces, old faces,
>> > and I encourage others to become involved.  If few Mbps >= 20,
>> > then your hardware might be interesting and we would certainly
>> > look at it.  If we cannot achieve what we want at 20 Mbps,
>> > then we might drop back in speed but that is the design goal.
>> > I am using the USRP (which is remarkably similar to what you
>> > have proposed and talked about on this forum earlier) as a slower
>> > speed version to do experimentation and development.  Even the
>> > DC and AM broadcast band experiments (2m, 70cm, etc.) have a
>> > very interesting twist.  Come to the ANNUAL MEETING and if you cannot,
>> > order copies of the proceedings.
>> >
>> > Caveat:
>> > AMSAT-NA is an equal opportunity exploiter ;-) and the more warm
>> > bodies there are to exploit the better.
>> >
>> > Bob
>> > N4HY
>> >
>> >
>> > -----Original Message-----
>> > From: John B. Stephensen [mailto:kd6ozh@verizon.net]
>> > Sent: Sunday, August 01, 2004 7:04 AM
>> > To: Robert McGwier; amsat-bb@AMSAT.Org
>> > Subject: Re: [amsat-bb] New amateur satellite ideas
>> >
>> >
>> > Its good to hear that work is proceeeding. I was worried after 
>> checking Phil
>> > Karn's web site and seeing that it hadn't been updated in two years.
>> >
>> > A few months ago I volunteered as the ARRL HSMM RMAN UHF project 
>> leader and
>> > am
>> > busy with the development a DSP-based transceiver for high-speed digital
>> > communication. The design will be published in QEX starting in the
>> > November/December issue. For terrestrial links, an OFDM modem will be
>> > implemented. However the hardware is completely programmable and could be
>> > used
>> > to implement a PSK or FSK link at a few MBPS. It would be nice if hams
>> > interested in satellites and HSMM could have interoperable hardware.
>> >
>> > I let my AMSAT membership lapse so I haven't received the AMSAT Journal in
>> > the
>> > past year and I couldn't find much information on the current web 
>> site. Who
>> > is
>> > the best person to contact to talk about coordinating efforts?
>> >
>> > 73,
>> >
>> > John
>> > KD6OZH
>>----
>>Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
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>
>
>
>---------------------------------
>W0EEC - CM87tm
>AMSAT Area Coordinator - San Francisco Bay Area
>http://www.projectoscar.net    http://www.PlanetEmily.com 
>http://www.emilyshouse.com/experthams/ao7/
>
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