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CX2SA > SATDIG 01.01.09 20:24l 743 Lines 22955 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. Re: FM receiver filters (Art McBride)
2. Re: Doppler correction too choppy on HRD? (Mike Ryan)
3. Re: Doppler correction too choppy on HRD? (Alan P. Biddle)
4. 817 and satpc32 problem solved! (Tim Goodrich)
5. Active- ISS L / v Repeater 04.07utc UK / Europe Pass
(David Barber)
6. Active- ISS L / v Repeater 05.43utc UK / Europe Pass
(David Barber)
7. Active- ISS L / v Repeater 07.18utc UK / Europe Pass
(David Barber)
8. Re: 817 and satpc32 problem solved! (Tim Tapio)
9. Ham-Mag - Work satellites with your HT (Trevor)
10. WA4SCA ISS Last Pass (dcowden@xx.xx.xxxx
11. Re: WA4SCA ISS Last Pass (Alan P. Biddle)
12. Re: FM receiver filters (Glen Zook)
13. Re: WA4SCA ISS Last Pass (K7WIN - Jeff)
14. FM Sat Packet (Marc)
15. Re: FM Sat Packet (Sebastian)
16. Re: FM Sat Packet (Andrew Glasbrenner)
17. Re: lindenblad observations (Joe Krepps)
18. Re: USB to serial converters (Mark Spencer)
----------------------------------------------------------------------
Message: 1
Date: Wed, 31 Dec 2008 14:29:16 -0800
From: "Art McBride" <kc6uqh@xxx.xxx>
Subject: [amsat-bb] Re: FM receiver filters
To: "'Bob Bruninga '" <bruninga@xxxx.xxx>, "'Anthony Monteiro'"
<aa2tx@xxxxxxx.xxx>, <G0MRF@xxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <CA3EE2890DF240E59E674D0B6C8A6176@xxxxxx>
Content-Type: text/plain; charset="US-ASCII"
Bob,
My point is that filter is not easily found in a 455 KHz center frequency.
ECS, Inc. makes 30 KHz wide filters in 10.7 , 21.4 and 45 MHz center
frequencies in 2 and 4 pole. They are available from Digi-Key. 455 KHz is
reserved for narrow band applications. A post data filter will reduce the
wide band noise by limiting the data rate to the incoming data rate. This
works well as long as there are no other signals within the IF pass band of
the receiver.
For digital signals Hi and Low comparators would give you a fast response
for AFC and would not require excessive preamble.
Art,
KC6UQH
-----Original Message-----
From: Bob Bruninga [mailto:bruninga@xxxx.xxxx
Sent: Wednesday, December 31, 2008 7:43 AM
To: kc6uqh@xxx.xxxx 'Anthony Monteiro'; G0MRF@xxx.xxxx amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Re: FM receiver filters
> I suggest you consider AFC.
> Not enough demand for that wide a filter.
Won't work for packets, or at least would require a long TXD making packet
communicatiosn inefficient.
As to rarity, only one filter in the whole world is needed and that is on
the uplink receiver. This lets eveyrone on the ground use conventional rigs
without mods, and with minimal doppler uplink tracking.
Too many simple satellites are being built without considering the need for
a wider bandwidth receiver on the uplink. The difficulties of such an
approach for users is very obvious on the ISS cross band repeater, which is
using a stock amateur transceiver with a 12 KHz wide receiver on the uplink,
which makes even 5 KHz step tuning on the uplink be out-of-bandwidth
splatter half the time.
This is not a complaint at all. The ISS team is to be congratulated for
making the most of what they were able to get up there. It just takes more
skill by users on the ground...
It is good to see this new UK project planning on a wider uplink RX filter.
Bob, Wb4APR
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------------------------------
Message: 2
Date: Wed, 31 Dec 2008 17:38:24 -0500
From: "Mike Ryan" <mryan301@xxxxxxx.xxx>
Subject: [amsat-bb] Re: Doppler correction too choppy on HRD?
To: <APBIDDLE@xxxxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <73F6A36725894632BB88D58FD2F61B43@xxxxxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hello Alan,
Thanks for the tip. I actually have a hookup for the 857 for digital modes
and just managed to test that out on AO-51. I confirm that the phenomenon
does not occur when listening to audio through the DATA jack.
So I have to listen through my computer. A little inconvenient buy way
better than buying new gear :).
Thanks again.
Mike WB1AAT
----- Original Message -----
From: "Alan P. Biddle" <APBIDDLE@xxxxxx.xxx>
To: "'Mike Ryan'" <mryan301@xxxxxxx.xxx>; <amsat-bb@xxxxx.xxx>
Sent: Wednesday, December 31, 2008 12:24 PM
Subject: RE: [amsat-bb] Doppler correction too choppy on HRD?
> Mike,
>
> For reasons unknown, those rigs mute the audio when changing frequency via
> CAT. I use another rig, but it has been reported that only the speaker
> and
> headphone outputs are muted, and that if you take the audio from the
> data/aux outputs there is no problem. Not specific and second hand, but
> you
> might want to look into that, as that is the real problem.
>
> Alan
> WA4SCA
>
>
>
------------------------------
Message: 3
Date: Wed, 31 Dec 2008 16:51:11 -0600
From: "Alan P. Biddle" <APBIDDLE@xxxxxx.xxx>
Subject: [amsat-bb] Re: Doppler correction too choppy on HRD?
To: "'Mike Ryan'" <mryan301@xxxxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <7F30EA5A8C25460BBFAE587F47C9F2D2@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Mike,
Glad to hear it works as advertized! Going through the computer works, and
I suspect you could pick off some of the audio and go to an amplified
speaker.
Happy New Year!
Alan
WA4SCA
------------------------------
Message: 4
Date: Wed, 31 Dec 2008 15:29:36 -0800
From: "Tim Goodrich" <tim@xxxxxxxxxxx.xxx>
Subject: [amsat-bb] 817 and satpc32 problem solved!
To: <amsat-bb@xxxxx.xxx>
Message-ID: <009e01c96b9f$a50f8680$ef2e9380$@xxx>
Content-Type: text/plain; charset="us-ascii"
Hi all,
A few days ago I posted the problem I was having with my new 817 and
satpc32. After emailing with the very kind Erich (creator of the software),
we were able to find the source of the problem in the CAT delay setting
(standard value was 110, but mine needed to be higher for some reason).
Below is my email to him with observations for any who might be experiencing
similar difficulties.
The strangest thing..... I came home and changed the CAT delay from 110 to
200. It worked! Both the mode and frequencies were changed for vfoa and vfob
and everything was good. Out of curiosity (and thinking it might help with
any troubleshooting you may need to do), I changed the CAT delay to 150. My
observations were that both the mode and freq. would change for vfoa and
vfob, but the interval settings did not work. What I mean by this is the
radio would switch between both vfo's on a very rapid basis, basically
whenever there was the slightest Doppler change, it would retune. Obviously,
this would make the receive audio extremely choppy.
To sum it up:
110-change downlink freq. and mode, change uplink mode only, rapid toggling
150- change downlink freq. and mode, change uplink freq. and mode, rapid
toggling
200- perfect
Tim
KC2DDS/AG
------------------------------
Message: 5
Date: Thu, 1 Jan 2009 04:21:28 -0000
From: "David Barber" <david.barber@xxxxxxxxxxxxx.xx.xx>
Subject: [amsat-bb] Active- ISS L / v Repeater 04.07utc UK / Europe
Pass
To: <amsat-bb@xxxxx.xxx>, <sarex@xxxxx.xxx>
Message-ID: <4280A435A63147C0B74D47D5DF072949@xxxxxxxx>
Content-Type: text/plain; charset="us-ascii"
Repeater active for 04.07utc UK / Europe Pass.
No other stations heard.
David
G8OQW
------------------------------
Message: 6
Date: Thu, 1 Jan 2009 05:59:39 -0000
From: "David Barber" <david.barber@xxxxxxxxxxxxx.xx.xx>
Subject: [amsat-bb] Active- ISS L / v Repeater 05.43utc UK / Europe
Pass
To: <amsat-bb@xxxxx.xxx>, <sarex@xxxxx.xxx>
Message-ID: <45B6A5256C31430E8A2CF9FDB5FD0084@xxxxxxxx>
Content-Type: text/plain; charset="us-ascii"
Repeater active for 05.43utc UK / Europe Pass.
Excellent pass, accessed repeater at best range yet, 750Km still using only
170w max ERP from tripod mounted 19 el horizontal yagi.
Held repeater much longer than has previously been achieved.
No other stations heard.
Recorded downlink.
David
G8OQW
------------------------------
Message: 7
Date: Thu, 1 Jan 2009 07:30:01 -0000
From: "David Barber" <david.barber@xxxxxxxxxxxxx.xx.xx>
Subject: [amsat-bb] Active- ISS L / v Repeater 07.18utc UK / Europe
Pass
To: <amsat-bb@xxxxx.xxx>, <sarex@xxxxx.xxx>
Message-ID: <F8739D43A5ED402D88E54D614AFDD16A@xxxxxxxx>
Content-Type: text/plain; charset="us-ascii"
Repeater active for 07.18utc UK / Europe Pass.
Max 20dg elevation here so too low for Tx antenna.
Excellent signal via repeater from IW4DVZ calling CQ.
No other stations heard.
Recorded downlink.
David
G8OQW
------------------------------
Message: 8
Date: Thu, 1 Jan 2009 06:31:26 -0500
From: "Tim Tapio" <tim@xxxxxxxx.xxx>
Subject: [amsat-bb] Re: 817 and satpc32 problem solved!
To: "'Tim Goodrich'" <tim@xxxxxxxxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <001c01c96c04$7bf65520$73e2ff60$@xxx>
Content-Type: text/plain; charset="us-ascii"
Perseverance and logic......good job!
73 and Happy New Year de Tim, K4SHF
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Tim Goodrich
Sent: Wednesday, December 31, 2008 6:30 PM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] 817 and satpc32 problem solved!
Hi all,
A few days ago I posted the problem I was having with my new 817 and
satpc32. After emailing with the very kind Erich (creator of the software),
we were able to find the source of the problem in the CAT delay setting
(standard value was 110, but mine needed to be higher for some reason).
Below is my email to him with observations for any who might be experiencing
similar difficulties.
The strangest thing..... I came home and changed the CAT delay from 110 to
200. It worked! Both the mode and frequencies were changed for vfoa and vfob
and everything was good. Out of curiosity (and thinking it might help with
any troubleshooting you may need to do), I changed the CAT delay to 150. My
observations were that both the mode and freq. would change for vfoa and
vfob, but the interval settings did not work. What I mean by this is the
radio would switch between both vfo's on a very rapid basis, basically
whenever there was the slightest Doppler change, it would retune. Obviously,
this would make the receive audio extremely choppy.
To sum it up:
110-change downlink freq. and mode, change uplink mode only, rapid toggling
150- change downlink freq. and mode, change uplink freq. and mode, rapid
toggling
200- perfect
Tim
KC2DDS/AG
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 9
Date: Thu, 1 Jan 2009 12:41:35 +0000 (GMT)
From: Trevor <m5aka@xxxxx.xx.xx>
Subject: [amsat-bb] Ham-Mag - Work satellites with your HT
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Message-ID: <372509.40034.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
The first English issue of the free electronic Amateur Radio magazine
Ham-Mag is now available and features an article on working satellites with
your HT by K6LCS.
The first issue can be downloaded from the magazines website at
http://www.ham-mag.com/ and if you subscribe (free) the magazine will be
emailed to you each month.
Note: The subscription page email address field assumes the @ character is
Shift-2 rather than the Shift-Quote used on some national keyboards.
The magazines editor is looking for articles for future issues.
73 Trevor M5AKA
----
------------------------------
Message: 10
Date: Thu, 1 Jan 2009 10:55:51 -0500
From: <dcowden@xx.xx.xxx>
Subject: [amsat-bb] WA4SCA ISS Last Pass
To: amsat-bb@xxxxx.xxx
Message-ID: <20090101155551.Y7VRN.388021.root@xxxxxxxxxxxxxxxx>
Content-Type: text/plain; charset=utf-8
Thanks Alan, WA4SCA, For the short contact. Solid 59 Copy most of the pass. I
had trouble with my TX doppler.
73, Don
N8DDK
------------------------------
Message: 11
Date: Thu, 1 Jan 2009 09:38:46 -0600
From: "Alan P. Biddle" <APBIDDLE@xxxxxx.xxx>
Subject: [amsat-bb] Re: WA4SCA ISS Last Pass
To: <dcowden@xx.xx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <21B2D3BF57474913B2337F40933D63C9@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Don,
Good to work you. Apparently there was a relatively narrow window where we
could both access the uplink. I got your call, then heard what sounded like
your being off frequency, and by the time you were back I could not access
the bird to reply.
On the next pass I worked KA9ERV with excellent signals. The later 15:03
UTC pass was relatively low elevation, NW to SE of my QTH. I noticed what
was probably ISS "obstacle fading" but when I had a clear shot, I was able
to get in with FAR less power than in the pass yesterday with a roughly
similar ground track, even at 1200 miles slant range.
73s es Happy New Year
Alan
WA4SCA
------------------------------
Message: 12
Date: Thu, 1 Jan 2009 08:17:37 -0800 (PST)
From: Glen Zook <gzook@xxxxx.xxx>
Subject: [amsat-bb] Re: FM receiver filters
To: "'Bob Bruninga '" <bruninga@xxxx.xxx>, "'Anthony Monteiro'"
<aa2tx@xxxxxxx.xxx>, G0MRF@xxx.xxxxxxxxxxxxx@xxxxx.xxxx kc6uqh@xxx.xxx
Message-ID: <227511.2969.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
You might find an old Motorola TU-540W filter around a two-way radio shop.
Those were used in equipment when the deviation was +/- 15 kHz and when the
deviation was dropped to +/- 5 kHz the filters were replaced with the TU-540S.
They are for a 455 kHz i.f.
Glen, K9STH
Website: http://k9sth.com
--- On Wed, 12/31/08, Art McBride <kc6uqh@xxx.xxx> wrote:
From: Art McBride <kc6uqh@xxx.xxx>
My point is that filter is not easily found in a 455 KHz center frequency.
ECS, Inc. makes 30 KHz wide filters in 10.7 , 21.4 and 45 MHz center
frequencies in 2 and 4 pole. They are available from Digi-Key. 455 KHz is
reserved for narrow band applications.
------------------------------
Message: 13
Date: Thu, 1 Jan 2009 09:51:02 -0700
From: "K7WIN - Jeff" <k7win@xxxxx.xxx>
Subject: [amsat-bb] Re: WA4SCA ISS Last Pass
To: <rm2642@xxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <000001c96c31$21bd6f30$65384d90$@xxx>
Content-Type: text/plain; charset="us-ascii"
Ron - N6PAA,
Thank you for the nice QSO via the ARISS L/V cross band repeater. I could
hear you announcing your station for over 2 minutes prior to our QSO and our
QSO lasted just about 2 minutes. I couldn't get in until ISS was above 15
degrees as I only have 10 watts on L Band. Very nice to be able to work the
new one. I hope we can have this opportunity again in the future.
Happy New Year,
Jeff - K7WIN
------------------------------
Message: 14
Date: Thu, 01 Jan 2009 10:42:58 -0500
From: Marc <hamma@xxxxxxxxx.xxx>
Subject: [amsat-bb] FM Sat Packet
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Message-ID: <495CE482.8050603@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hello all and Happy New Year,
I hate to sound like such a Newbie, but I know how hard it was figuring
out some of the nuances of FM and SSB voice birds with no experience in
Sats. Asking for help would have cut down my learning cure immensely.
The learning curve can be tough when doing something new with the
assistance of old data. So rather than going through that again, I am
going to ask for help. I have just rewired my old Kantronics all mode
TNC to my FT-847 and have been watching some local APRS data packets. I
think I am ready to see what is available on Sats. What are the Sats
that I can hear and TX to in the 2m/440 freqs that, are easy to hit with
minimum antenna equipment?
N1SDH
Marc
------------------------------
Message: 15
Date: Thu, 1 Jan 2009 12:33:38 -0500
From: Sebastian <w4as@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: FM Sat Packet
To: AMSAT BB <AMSAT-BB@xxxxx.xxx>
Message-ID: <E633B9E2-3C6C-411E-AEB1-77E5EEE4BFAE@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
I would go to this site: http://oscar.dcarr.org/index.php
Click on the satellite names, such as AO-51, etc. That links to the
'home' page of each satellite, and gives you a lot of information.
As far as what sats are easy to hit with minimum antenna equipment -
it depends on what you mean by minimum. You have a great radio to
start with; however don't expect to get good results if you are using
only a vertical. Check the recent posts on this reflector about Arrow
and Elk antennas. While those are typically handheld, you can mount
them permanently.
Feel free to email me directly if you'd like more information, I'll be
listening for you on the birds.
73 de W4AS
Sebastian
On Jan 1, 2009, at 10:42 AM, Marc wrote:
> Hello all and Happy New Year,
> I hate to sound like such a Newbie, but I know how hard it was
> figuring
> out some of the nuances of FM and SSB voice birds with no experience
> in
> Sats. Asking for help would have cut down my learning cure immensely.
> The learning curve can be tough when doing something new with the
> assistance of old data. So rather than going through that again, I am
> going to ask for help. I have just rewired my old Kantronics all mode
> TNC to my FT-847 and have been watching some local APRS data
> packets. I
> think I am ready to see what is available on Sats. What are the Sats
> that I can hear and TX to in the 2m/440 freqs that, are easy to hit
> with
> minimum antenna equipment?
> N1SDH
> Marc
------------------------------
Message: 16
Date: Thu, 1 Jan 2009 12:42:04 -0500
From: "Andrew Glasbrenner" <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: FM Sat Packet
To: "Sebastian" <w4as@xxxxxxxxx.xxx>, "AMSAT BB" <AMSAT-BB@xxxxx.xxx>
Message-ID: <E781A2FFB5DA4E7ABB8928B6FCA5F869@xxxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
>I would go to this site: http://oscar.dcarr.org/index.php
>
> Click on the satellite names, such as AO-51, etc. That links to the
> 'home' page of each satellite, and gives you a lot of information.
A lot of those links take you to the old AMSAT webpages, some of which are
pretty out of date.
http://www.amsat.org/amsat-new/satellites/status.php has more current
information, and may not be 100% up to date, but is better than the other
links. If you see something in obvious error, send me a note to
ko4ma@xxxxx.xxx , include the source of the updated information, and I'll
update the page.
73, Drew KO4MA
------------------------------
Message: 17
Date: Thu, 01 Jan 2009 13:28:00 -0500
From: Joe Krepps <occupant@xxxxxxx.xxx>
Subject: [amsat-bb] Re: lindenblad observations
To: amsat-bb@xxxxx.xxx
Message-ID: <495D0B30.1090905@xxxxxxx.xxx>
Content-Type: text/plain; charset=us-ascii; format=flowed
Ed,
I googled "AA2TX Lindenblad" and found:
http://www.arrl.org/qst/2007/08/monteiro.pdf
Hope this helps & 73! :)
Joe WB3CFN
------------------------------
Message: 18
Date: Thu, 1 Jan 2009 10:39:00 -0800 (PST)
From: Mark Spencer <mspencer12345@xxxxx.xx>
Subject: [amsat-bb] Re: USB to serial converters
To: amsat-bb@xxxxx.xxx
Message-ID: <341755.36155.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
Thanks all for the responses to this.?? I was able to find a cheap unit in a
local electronics store that they agreeded to allow me to return if it did not
work.
While at first it appeared that it had the FTDI chip set (some of the driver
software referrs to that chip set..)??it seems that it is a "Simple
Perfection" PL 2303 unit that uses a different chip set.
So far it works with all my equipment (inlcuding my FT 736 and SAT32PC)? If it
does not work out in the future I will obtain one of the ones you have
mentioned.
Best regards and 73
VE7AFZ
?
________________________________
From: Tim Tapio <tim@xxxxxxxx.xxx>
To: APBIDDLE@xxxxxxx.xxxx amsat-bb@xxxxx.xxx
Sent: Tuesday, December 30, 2008 2:20:29 PM
Subject: [amsat-bb] Re: USB to serial converters
The FTDI chip set seems to be the best way to go.? I bought my adapters
through Parallax, for $14.95 plus s/h.? I have found nothing that doesn't
work with it, either under XP or Vista.
Tim T.? K4SHF
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Alan P. Biddle
Sent: Tuesday, December 30, 2008 4:06 PM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: USB to serial converters
Mark,
Keyspans are good.? I have only one, really old, obscure piece of software
which won't work with them.
I got a rig programmer from RT Systems, and picked up one of the RTS-03 as
they guaranteed it would work.? It did, and with everything else I tried it.
Somewhat brand X, but it uses the FTDI chip set.?
http://www.rtsystemsinc.com/othercables_template.cfm?cfid=3106444&cftoken=39
931273
Something to consider is an adapter by Parallax.? Go to WWW.PARALLAX.COM and
put in the part number 28030. It uses the FTDI chip set, and is designed to
be used as a programming controller rather than just a communications
interface, so it brings out a few more lines than does the typical USB to
serial converter.? Some rigs may need those.? With the USB A to mini USB B
cable it is about $20.? I have never found a rig or similar control function
it will not support, even when making house calls.? The only drawback it
that it doesn't really have a case.? With a little Exacto knife work you can
modify a cheap plastic RS shell to fit.
Alan
WA4SCA
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
__________________________________________________________________
Connect with friends from any web browser - no download required. Try the new
Yahoo! Canada Messenger for the Web BETA at
http://ca.messenger.yahoo.com/webmessengerpromo.php
------------------------------
_______________________________________________
Sent via amsat-bb@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
http://amsat.org/mailman/listinfo/amsat-bb
End of AMSAT-BB Digest, Vol 4, Issue 1
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