| |
CX2SA > SATDIG 21.06.10 21:22l 1099 Lines 34992 Bytes #999 (0) @ WW
BID : AMSATBB5274
Read: GUEST
Subj: AMSAT-BB-digest V5 274
Path: IZ3LSV<IK3GET<IW2OHX<OE6XPE<OE3XZR<OE1XAB<HG8LXL<CX2SA
Sent: 100621/1900Z @:CX2SA.LAV.URY.SA #:1976 [Minas] FBB7.00e $:AMSATBB5274
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. States needed for WAS on satellite (Larry Teran)
2. Re: States needed for WAS on satellite (Dave Webb KB1PVH)
3. KLM 2M-22C Antenna for sale (Pat McGrath)
4. Re: States needed for WAS on satellite (John Price)
5. States needed for WAS on satellite (Daniel "Nick" Kucij)
6. AO-51 Mode V/S schedule should start 10:45Z 21Jun10
(Andrew Glasbrenner)
7. SO-67 back on air! (Jan-Albert Koekemoer)
8. Re: SO-67 back on air! (Ron Overdrive)
9. Batteries for FT 817 (ANTHONY JAPHA)
10. Re: Batteries for FT 817 (Ron Overdrive)
11. Re: [Sumbandila: 250] SO-67 back on air! (Madhukar KR)
12. Re: Batteries for FT 817 (G0MRF@xxx.xxxx
13. Electronics parts in space? (Andy Brian)
14. Re: SO-67 back on air! (Eric Knaps, ON4HF)
15. Re: SO-67 back on air! (George Henry)
16. Re: SO-67 back on air! (PE0SAT)
----------------------------------------------------------------------
Message: 1
Date: Sun, 20 Jun 2010 14:36:05 -0800
From: Larry Teran <ki6yaa@xxxxx.xxx>
Subject: [amsat-bb] States needed for WAS on satellite
To: amsat-bb@xxxxx.xxx
Message-ID:
<AANLkTilo3CIIicy0uRPHR7Ih08CXHGfOUyWZg8j0StJE@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
I need the following States to complete the WAS award from ARRL, I will
appreciate if they are any stations from these states or information of a
station to contact to sked a QSO. thanks for your time.
73"s Larry KI6YAA
Connecticut
Maine
Massachusetts
Mississippi
North Carolina
Rhode Island
West Virginia
Wisconsin
------------------------------
Message: 2
Date: Sun, 20 Jun 2010 18:57:30 -0400
From: Dave Webb KB1PVH <kb1pvh@xxxxx.xxx>
Subject: [amsat-bb] Re: States needed for WAS on satellite
To: Larry Teran <ki6yaa@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID:
<AANLkTilqYD_BR2NU_-jTUeM7-_VA4iGHOFpGFnIFNEBQ@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Larry,
I can take care of Massachusetts for you. Email me direct.
DAVE-KB1PVH
Sent from my Verizon Wireless DROID
On Jun 20, 2010 6:52 PM, "Larry Teran" <ki6yaa@xxxxx.xxx> wrote:
I need the following States to complete the WAS award from ARRL, I will
appreciate if they are any stations from these states or information of a
station to contact to sked a QSO. thanks for your time.
73"s Larry KI6YAA
Connecticut
Maine
Massachusetts
Mississippi
North Carolina
Rhode Island
West Virginia
Wisconsin
_______________________________________________
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: 3
Date: Sun, 20 Jun 2010 17:08:20 -0700
From: "Pat McGrath" <ka6tya@xxxx.xxx>
Subject: [amsat-bb] KLM 2M-22C Antenna for sale
To: <amsat-bb@xxxxx.xxx>
Message-ID: <CF8BA935D25F41D495D275BF8169CEC6@xxxxxxxxx>
Content-Type: text/plain; format=flowed; charset=iso-8859-1;
reply-type=original
KLM 2M-22C circularly polarized satellite antenna in good working
condition. PICK UP ONLY. On the ground in 4-6 ft. sections for easy
transport, but elements not disassembled. Located in Walnut, California.
Will sell to best offer..
------------------------------
Message: 4
Date: Sun, 20 Jun 2010 20:10:19 -0400
From: John Price <n4qwf1@xxxxx.xxx>
Subject: [amsat-bb] Re: States needed for WAS on satellite
To: Larry Teran <ki6yaa@xxxxx.xxx>, amsat-bb@xxxxx.xxx
Message-ID:
<AANLkTingHgj9Wotb-_vfOdY10aA3OrOLPvBTdnWh4mT3@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
I will be at Holden Beach, NC starting this coming Saturday. I hope to
catch some of the passes of the FM birds that evening. I will be
active with the handheld and Arrow from time to time all that next
week. If you still need North Carolina at that time email me and I
will work a skid with you. I hope to be on AO-51 both V/u and V/s
during field day. Might catch you then. 73's << John
On Sun, Jun 20, 2010 at 6:36 PM, Larry Teran <ki6yaa@xxxxx.xxx> wrote:
> I need the following States to complete the WAS award from ARRL, I will
> appreciate if they are any stations from these states or information of a
> station to contact to sked a QSO. thanks for your time.
>
> 73"s Larry KI6YAA
>
> Connecticut
> Maine
> Massachusetts
> Mississippi
> North Carolina
> Rhode Island
> West Virginia
> Wisconsin
> _______________________________________________
> 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
>
--
N4QWF Amateur Radio Operator
AO-7,AO-27,FO-29,SO-50,AO-51,VO-52,ISS
Email N4QWF@xxxxx.xxx
Formerly KC4AHW VK3FEZ
Amsat Member #27845
DXCC #33,478
VUCC SAT #135
WAS SAT #296
51 on AO-51 #13
LON -79.256 LAT 37.459 Grid FM07il
>From the Foothills of the Blueridge
*Life should not be a journey to the grave with the intention of
arriving safely in a pretty and well preserved body, but rather to
skid in broadside, thoroughly used up, totally worn out, and loudly
proclaiming - "WOW, What a ride!"
------------------------------
Message: 5
Date: Sun, 20 Jun 2010 21:43:20 -0400
From: "Daniel \"Nick\" Kucij" <dnkucij@xxxxxxxxxxx.xxx>
Subject: [amsat-bb] States needed for WAS on satellite
To: amsat-bb@xxxxx.xxx
Message-ID: <558C069A-A8C2-4D35-96C0-C44DCB119DC8@xxxxxxxxxxx.xxx>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
Hi Larry,
I'm over in Maine on vacation this week, near Acadia National Park.
I've got my HT and small yagi with me. I'd be glad to try for a QSO
with you. Just send me an email.
73
Nick
KB1RVT/P
FN54
------------------------------
Message: 6
Date: Mon, 21 Jun 2010 06:05:21 -0400
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] AO-51 Mode V/S schedule should start 10:45Z
21Jun10
To: Amsat-BB <amsat-bb@xxxxx.xxx>
Message-ID: <4C1F3961.3090601@xxxxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Please submit any reports to -bb or the website at
http://oscar.dcarr.org/ . Of particular interest are reports between
10:45 and 11:29 today. We may need a few passes to get the scheduling
working right, so please send those reports, and bear with us.
73, Drew KO4MA
------------------------------
Message: 7
Date: Mon, 21 Jun 2010 16:04:52 +0200
From: "Jan-Albert Koekemoer" <jan.koekemoer@xxxxxxxx.xx.xx>
Subject: [amsat-bb] SO-67 back on air!
To: <amsat-bb@xxxxx.xxx>
Cc: Gladys Magagula <GMagagula@xxxx.xx.xx>,
sumbandila@xxxxxxxxxxxx.xxxxxxxxx van de Groenendaal
<hans@xxxxxxx.xx.xx>
Message-ID:
<7D5AF80924991449B40C9CB717C7A691032918BE@xxxx.xxxxxxxx.xx.xx>
Content-Type: text/plain; charset="iso-8859-1"
Hello
After much delay we are now in a position to re-activate the SA-AMSAT payload
schedules on a regular basis again!
During the downtime we conducted several experiments in order to investigate
possible alternatives for the "cut-off" problem experienced by many at the
end of last year / beginning of this year. The cut-off is caused by SW
running on piggyback electronics that continues to gate the received audio
onto the transmitter for about 3s after a specific ground transmission has
ended, whereafter the received audio is cut off. The SW then waits for the
next ground transmission with a valid "transponder" tone embedded, before
gating the audio onto the transmitter again. So if a second transmission
starts within the 3s "tail" period, it will be cut off when the 3s expires.
Listen to this mp3 recording as an example: http://tinyurl.com/38vvg3o
Unfortunately the piggyback electronics does not have reprogramming
functionality, so we are not able to change the SW. We did however manage to
implement a mechanism on the satellite transponder (used by the piggyback)
that should be of some assistance when using the payload: the PTT of the
transmitter now STAYS ON for the duration of the payload activation (i.e. 15
min), regardless of a valid "transponder" tone received. Note that this does
not get rid of the "cut-off" problem, nor of the requirement to embed a valid
tone when you want to use the payload - see detailed explanation below.
The following example depicts the ideal usage scenario of the payload:
1. As the satellite comes over the horizon, an unmodulated carrier
("quieting") will be received by all on UHF
2. Person A starts to transmit on VHF (with valid "transponding" tone
embedded in the transmission) and the transmission is relayed on UHF
3. When Person A releases his/her PTT, the satellite will continue to
transmit what it is receiving (usually this will be "noise") for a further
?3s. Nobody should start to transmit during this time!
4. At the end of the ?3s period, everybody will again hear the
unmodulated carrier.
5. NB: only when this unmodulated carrier is heard should Person B
start to transmit. Listen to this mp3 recording as an example of valid
usage: http://tinyurl.com/32rjbxm
I suppose this will take some getting use to - at least the system has a
built-in "punishment" mechanism for the impatient! ;-)
Please refer to previous posts on general voice quality optimization when
using the SA-AMSAT payload on SO-67.
I will request Gladys Magagula at the Satellite Application Centre to obtain
regular schedules from the regional coordinators as soon as possible. We
will start off with day passes only, transmit on 2.5W and see how things go.
Enjoy!
Regards
Jan-Albert
________________________________________
Jan-Albert Koekemoer, PrEng
Sun Space & Information Systems (Pty) Ltd.
Stellenbosch, South Africa
www.sunspace.co.za <http://www.sunspace.co.za>
+27 21 880 8117 (tel)
+27 83 461 6643 (cell)
+27 21 880 1703 (fax)
E-mail Disclaimer
http://www.sunspace.co.za/emaildisclaimer.htm
------------------------------
Message: 8
Date: Mon, 21 Jun 2010 10:41:25 -0400
From: Ron Overdrive <ronoverdrive@xxxxxxxx.xxx>
Subject: [amsat-bb] Re: SO-67 back on air!
To: Jan-Albert Koekemoer <jan.koekemoer@xxxxxxxx.xx.xx>
Cc: Gladys Magagula <GMagagula@xxxx.xx.xx>, amsat-bb@xxxxx.xxxxxxxxx
van de Groenendaal <hans@xxxxxxx.xx.xx>, sumbandila@xxxxxxxxxxxx.xxx
Message-ID:
<AANLkTimNCuz7XeF1Ls8iOPSWqBxyx4lY_BrKPFIUcxYO@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Honestly sounds like a good way to keep people from doubling/tripling up on
each other. Might end up making more contacts per pass if everyone is forced
to wait between transmissions to be heard.
On Mon, Jun 21, 2010 at 10:04 AM, Jan-Albert Koekemoer <
jan.koekemoer@xxxxxxxx.xx.xx> wrote:
> Hello
>
>
>
> After much delay we are now in a position to re-activate the SA-AMSAT
> payload
> schedules on a regular basis again!
>
>
>
> During the downtime we conducted several experiments in order to
> investigate
> possible alternatives for the "cut-off" problem experienced by many at the
> end of last year / beginning of this year. The cut-off is caused by SW
> running on piggyback electronics that continues to gate the received audio
> onto the transmitter for about 3s after a specific ground transmission has
> ended, whereafter the received audio is cut off. The SW then waits for the
> next ground transmission with a valid "transponder" tone embedded, before
> gating the audio onto the transmitter again. So if a second transmission
> starts within the 3s "tail" period, it will be cut off when the 3s expires.
> Listen to this mp3 recording as an example: http://tinyurl.com/38vvg3o
>
>
>
> Unfortunately the piggyback electronics does not have reprogramming
> functionality, so we are not able to change the SW. We did however manage
> to
> implement a mechanism on the satellite transponder (used by the piggyback)
> that should be of some assistance when using the payload: the PTT of the
> transmitter now STAYS ON for the duration of the payload activation (i.e.
> 15
> min), regardless of a valid "transponder" tone received. Note that this
> does
> not get rid of the "cut-off" problem, nor of the requirement to embed a
> valid
> tone when you want to use the payload - see detailed explanation below.
>
>
>
> The following example depicts the ideal usage scenario of the payload:
>
> 1. As the satellite comes over the horizon, an unmodulated carrier
> ("quieting") will be received by all on UHF
>
> 2. Person A starts to transmit on VHF (with valid "transponding" tone
> embedded in the transmission) and the transmission is relayed on UHF
>
> 3. When Person A releases his/her PTT, the satellite will continue to
> transmit what it is receiving (usually this will be "noise") for a further
> ?3s. Nobody should start to transmit during this time!
>
> 4. At the end of the ?3s period, everybody will again hear the
> unmodulated carrier.
>
> 5. NB: only when this unmodulated carrier is heard should Person B
> start to transmit. Listen to this mp3 recording as an example of valid
> usage: http://tinyurl.com/32rjbxm
>
>
>
> I suppose this will take some getting use to - at least the system has a
> built-in "punishment" mechanism for the impatient! ;-)
>
>
>
> Please refer to previous posts on general voice quality optimization when
> using the SA-AMSAT payload on SO-67.
>
>
>
> I will request Gladys Magagula at the Satellite Application Centre to
> obtain
> regular schedules from the regional coordinators as soon as possible. We
> will start off with day passes only, transmit on 2.5W and see how things
> go.
>
>
>
> Enjoy!
>
>
>
> Regards
> Jan-Albert
>
>
>
> ________________________________________
>
> Jan-Albert Koekemoer, PrEng
>
> Sun Space & Information Systems (Pty) Ltd.
>
> Stellenbosch, South Africa
>
> www.sunspace.co.za <http://www.sunspace.co.za>
>
> +27 21 880 8117 (tel)
>
> +27 83 461 6643 (cell)
>
> +27 21 880 1703 (fax)
>
>
>
>
>
> E-mail Disclaimer
> http://www.sunspace.co.za/emaildisclaimer.htm
>
> _______________________________________________
> 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: Mon, 21 Jun 2010 12:12:51 -0400
From: "ANTHONY JAPHA" <tjjapha@xxxxxxxxx.xxx>
Subject: [amsat-bb] Batteries for FT 817
To: "amsat-bb" <amsat-bb@xxxxx.xxx>
Message-ID: <380-220106121161251281@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=US-ASCII
I use 2 FT817s for portable ops, and have been disappointed in the battery
performance. Last year, I bought replacement batteries from Batteries
America, the FNB-72xe, rated at 9.6v. at 2000mAh. There's no noticable
difference between these new batteries and the originals.
The batteries charge to just over 11.0 volts, but quickly drop through 10
volts, as indicated by the voltage reading that appears when the rigs are
turned on. Maybe this is just normal behavior for a 9.6 v. battery. Is
this what you would expect? Has anyone found a battery with a higher
voltage rating and/or one that will maintain a higher voltage for an
appreciable period--and fits into the 817? Every bit of power helps!
Many tnx and 73,
Tony, N2UN
LM 183
------------------------------
Message: 10
Date: Mon, 21 Jun 2010 12:34:49 -0400
From: Ron Overdrive <ronoverdrive@xxxxxxxx.xxx>
Subject: [amsat-bb] Re: Batteries for FT 817
To: tjjapha@xxxxxxxxx.xxx
Cc: amsat-bb <amsat-bb@xxxxx.xxx>
Message-ID:
<AANLkTikrSYI29yFCoU6bOSmKtcLQApwdf1sXLwkTZDYk@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
What you are seeing is over-charge which is normal. The battery should
settle around the 9.6v mark and last a while there. Even when charging my
Sanyo Superlatice Evo Cell 2700mah batteries I see over-charge. A good page
to look at regarding power consumption in the FT817 is
http://www.ka7oei.com/ft817_pwr.html . He sums up that a good way to
conserve power is to turn the IPO On, keep the NB Off, keep the Screen
Backlight Off, and stick to using the Front BNC connector will save the most
power. Wearing headphones and transmitting on lower power helps out too.
~73, KC2WQW
On Mon, Jun 21, 2010 at 12:12 PM, ANTHONY JAPHA <tjjapha@xxxxxxxxx.xxx>wrote:
> I use 2 FT817s for portable ops, and have been disappointed in the battery
> performance. Last year, I bought replacement batteries from Batteries
> America, the FNB-72xe, rated at 9.6v. at 2000mAh. There's no noticable
> difference between these new batteries and the originals.
>
> The batteries charge to just over 11.0 volts, but quickly drop through 10
> volts, as indicated by the voltage reading that appears when the rigs are
> turned on. Maybe this is just normal behavior for a 9.6 v. battery. Is
> this what you would expect? Has anyone found a battery with a higher
> voltage rating and/or one that will maintain a higher voltage for an
> appreciable period--and fits into the 817? Every bit of power helps!
>
> Many tnx and 73,
> Tony, N2UN
> LM 183
> _______________________________________________
> 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: 11
Date: Mon, 21 Jun 2010 22:01:25 +0530
From: Madhukar KR <vu2mud@xxxxx.xxx>
Subject: [amsat-bb] Re: [Sumbandila: 250] SO-67 back on air!
To: sumbandila@xxxxxxxxxxxx.xxx
Cc: Gladys Magagula <GMagagula@xxxx.xx.xx>, amsat-bb@xxxxx.xxxxxxxxx
van de Groenendaal <hans@xxxxxxx.xx.xx>
Message-ID:
<AANLkTiki54CUPRvahabt4bwFu2GCLbFUamNYJXBl7ruB@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=windows-1252
Dear Sumbandila Team,
Congrats and Thanks for getting SO-67 back on the air again. Will certainly
look forward to work through the Satellite again.
We fully understand the requirement for activation during Day time passes.
Since most of us here in India use simple "Fixed" antenna setups - please
consider the Higher Elevation Angles ahead of the lower ones - if all the
passes cannot be activated. Personal request from the small group here in
South India.
The Sked required for the Day Passes over Indian Subcontinent is a follows:
Satellite Start time IST START UTC Start AZ Peak AZ Peak EL END - UTC End
Az SUMBANDILA (SO-67) 22-Jun-10 08:31:56 03:01 31 101 20 03:12:51 167
SUMBANDILA
(SO-67) 22-Jun-10 10:06:07 04:36 338 282 11 04:45:42 229 SUMBANDILA (SO-67)
23-Jun-10 08:13:52 02:43 43 99 10 02:53:27 153 SUMBANDILA (SO-67) 23-Jun-10
09:46:51 04:16 350 280 21 04:27:41 215 SUMBANDILA (SO-67) 24-Jun-10 07:56:20
02:26 59 98 4 02:33:30 135 SUMBANDILA (SO-67) 24-Jun-10 09:27:50 03:57 0 278
41 04:09:25 203 SUMBANDILA (SO-67) 25-Jun-10 09:09:03 03:39 10 196 88
03:50:53 191 SUMBANDILA (SO-67) 26-Jun-10 08:50:28 03:20 20 106 41 03:32:08
179 SUMBANDILA (SO-67) 26-Jun-10 10:26:04 04:56 324 284 4 05:03:19 246
SUMBANDILA
(SO-67) 27-Jun-10 08:32:08 03:02 31 101 21 03:13:03 167 SUMBANDILA (SO-67)
27-Jun-10 10:06:21 04:36 338 282 10 04:45:51 229
Request an early confirmation so that the same can be published among the
Local Hams and hope good activity from India.
Further sked for the next week will be emailed on Friday before 1200Z
Madhukar ? VU2MUD
Yahoo Mail: vu2mud@xxxxx.xx.xx
Gmail: vu2mud@xxxxx.xxx
General Blog: http://vu2mud.blogspot.com
Satellite Blog: http://workingtheoscars.blogspot.com
On Mon, Jun 21, 2010 at 7:34 PM, Jan-Albert Koekemoer <
jan.koekemoer@xxxxxxxx.xx.xx> wrote:
> Hello
>
>
>
> After much delay we are now in a position to re-activate the SA-AMSAT
> payload schedules on a regular basis again!
>
>
>
> During the downtime we conducted several experiments in order to
> investigate possible alternatives for the ?cut-off? problem experienced by
> many at the end of last year / beginning of this year. The cut-off is
> caused by SW running on piggyback electronics that continues to gate the
> received audio onto the transmitter for about 3s after a specific ground
> transmission has ended, whereafter the received audio is cut off. The SW
> then waits for the next ground transmission with a valid ?transponder? tone
> embedded, before gating the audio onto the transmitter again. So if a
> second transmission starts within the 3s ?tail? period, it will be cut off
> when the 3s expires. Listen to this mp3 recording as an example:
> http://tinyurl.com/38vvg3o* *
>
>
>
> Unfortunately the piggyback electronics does not have reprogramming
> functionality, so we are not able to change the SW. We did however manage
> to implement a mechanism on the satellite transponder (used by the
> piggyback) that should be of some assistance when using the payload: the
> PTT of the transmitter now STAYS ON for the duration of the payload
> activation (i.e. 15 min), regardless of a valid ?transponder? tone
> received. Note that this does not get rid of the ?cut-off? problem, nor of
> the requirement to embed a valid tone when you want to use the payload ? see
> detailed explanation below.
>
>
>
> The following example depicts the ideal usage scenario of the payload:
>
> 1. As the satellite comes over the horizon, an unmodulated carrier
> (?quieting?) will be received by all on UHF
>
> 2. Person A starts to transmit on VHF (with valid ?transponding?
> tone embedded in the transmission) and the transmission is relayed on UHF
>
> 3. When Person A releases his/her PTT, the satellite will continue
> to transmit what it is receiving (usually this will be ?noise?) for a
> further ?3s. Nobody should start to transmit during this time!
>
> 4. At the end of the ?3s period, everybody will again hear the
> unmodulated carrier.
>
> 5. NB: only when this unmodulated carrier is heard should Person B
> start to transmit. Listen to this mp3 recording as an example of valid
> usage: http://tinyurl.com/32rjbxm* *
>
>
>
> I suppose this will take some getting use to ? at least the system has a
> built-in ?punishment? mechanism for the impatient! ;-)
>
>
>
> Please refer to previous posts on general voice quality optimization when
> using the SA-AMSAT payload on SO-67.
>
>
>
> I will request Gladys Magagula at the Satellite Application Centre to
> obtain regular schedules from the regional coordinators as soon as
> possible. We will start off with day passes only, transmit on 2.5W and see
> how things go.
>
>
>
> Enjoy!
>
>
>
> Regards
> Jan-Albert
>
>
>
> ________________________________________
>
> *Jan-Albert Koekemoer, PrEng***
>
> *Sun Space & Information Systems (Pty) Ltd.*
>
> Stellenbosch, South Africa
>
> www.sunspace.co.za
>
> +27 21 880 8117 (tel)
>
> +27 83 461 6643 (cell)
>
> +27 21 880 1703 (fax)
>
>
>
> E-mail Disclaimer
> http://www.sunspace.co.za/emaildisclaimer.htm
>
> <http://www.sunspace.co.za/emaildisclaimer.htm>
>
------------------------------
Message: 12
Date: Mon, 21 Jun 2010 13:32:19 EDT
From: G0MRF@xxx.xxx
Subject: [amsat-bb] Re: Batteries for FT 817
To: tjjapha@xxxxxxxxx.xxxx amsat-bb@xxxxx.xxx
Message-ID: <5ff.39dfa7e3.3950fc23@xxx.xxx>
Content-Type: text/plain; charset="US-ASCII"
In a message dated 21/06/2010 17:27:29 GMT Standard Time,
tjjapha@xxxxxxxxx.xxx writes:
I use 2 FT817s for portable ops, and have been disappointed in the battery
performance. Last year, I bought replacement batteries from Batteries
America, the FNB-72xe, rated at 9.6v. at 2000mAh. There's no noticable
difference between these new batteries and the originals.
The batteries charge to just over 11.0 volts, but quickly drop through 10
volts, as indicated by the voltage reading that appears when the rigs are
turned on. Maybe this is just normal behavior for a 9.6 v. battery. Is
this what you would expect? Has anyone found a battery with a higher voltage
rating and/or one that will maintain a higher voltage for an appreciable
period--and fits into the 817? Every bit of power helps!
Many tnx and 73,
Tony, N2UN
LM 183
Hi Tony.
Not sure about fitting in the FT817....But there are a lot of people over
here participating in "summits on the air" driving / walking / climbing to
the top of a peak and making some QSOs. The FT817 is very popular and they
all seem to be using 3 series Lithium polymer cells.
According to the hype, the lithium polymers weigh nothing hold nearly
infinate charge and finally discharge within a few seconds of the natural
lifespan of the operators radio.
Whatever the reality, they may be worth investigating.
Regards
David G0MRF
------------------------------
Message: 13
Date: Mon, 21 Jun 2010 19:57:04 +0200
From: Andy Brian <briaandy@xxxxx.xxx>
Subject: [amsat-bb] Electronics parts in space?
To: AMSAT-BB <amsat-bb@xxxxx.xxx>
Message-ID:
<AANLkTilGycqoFRnBMrhBDTmXUlDjUuwX6Z3Ac4hMH09z@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
what happen with electronics parts in space like
quartz and electrolytic capacitor in vacuum. I have never heard
about how quartz works in space is there any limitations?
I know that some plastic outgasing and are not suitable for use
in space, but if using COTS technology like hamradio station yaesu vx-series
on cubesats,
I believe that there are many electronics parts which are crytical for
use on the cubesats?
thanks for comments,
best regards
Andy
------------------------------
Message: 14
Date: Mon, 21 Jun 2010 20:01:28 +0200
From: "Eric Knaps, ON4HF" <on4hf@xxxxxxx.xx>
Subject: [amsat-bb] Re: SO-67 back on air!
To: Jan-Albert Koekemoer <jan.koekemoer@xxxxxxxx.xx.xx>
Cc: Gladys Magagula <GMagagula@xxxx.xx.xx>, amsat-bb@xxxxx.xxxxxxxxx
van de Groenendaal <hans@xxxxxxx.xx.xx>, sumbandila@xxxxxxxxxxxx.xxx
Message-ID: <4C1FA8F8.5080100@xxxxxxx.xx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi there,
Do you really think that the European alligators will wait for 3 seconds?
Op 21/06/2010 16:04, Jan-Albert Koekemoer schreef:
> Hello
>
>
>
> After much delay we are now in a position to re-activate the SA-AMSAT
payload
> schedules on a regular basis again!
>
>
>
> During the downtime we conducted several experiments in order to investigate
> possible alternatives for the "cut-off" problem experienced by many at the
> end of last year / beginning of this year. The cut-off is caused by SW
> running on piggyback electronics that continues to gate the received audio
> onto the transmitter for about 3s after a specific ground transmission has
> ended, whereafter the received audio is cut off. The SW then waits for the
> next ground transmission with a valid "transponder" tone embedded, before
> gating the audio onto the transmitter again. So if a second transmission
> starts within the 3s "tail" period, it will be cut off when the 3s expires.
> Listen to this mp3 recording as an example: http://tinyurl.com/38vvg3o
>
>
>
> Unfortunately the piggyback electronics does not have reprogramming
> functionality, so we are not able to change the SW. We did however manage
to
> implement a mechanism on the satellite transponder (used by the piggyback)
> that should be of some assistance when using the payload: the PTT of the
> transmitter now STAYS ON for the duration of the payload activation (i.e. 15
> min), regardless of a valid "transponder" tone received. Note that this
does
> not get rid of the "cut-off" problem, nor of the requirement to embed a
valid
> tone when you want to use the payload - see detailed explanation below.
>
>
>
> The following example depicts the ideal usage scenario of the payload:
>
> 1. As the satellite comes over the horizon, an unmodulated carrier
> ("quieting") will be received by all on UHF
>
> 2. Person A starts to transmit on VHF (with valid "transponding" tone
> embedded in the transmission) and the transmission is relayed on UHF
>
> 3. When Person A releases his/her PTT, the satellite will continue to
> transmit what it is receiving (usually this will be "noise") for a further
> ?3s. Nobody should start to transmit during this time!
>
> 4. At the end of the ?3s period, everybody will again hear the
> unmodulated carrier.
>
> 5. NB: only when this unmodulated carrier is heard should Person B
> start to transmit. Listen to this mp3 recording as an example of valid
> usage: http://tinyurl.com/32rjbxm
>
>
>
> I suppose this will take some getting use to - at least the system has a
> built-in "punishment" mechanism for the impatient! ;-)
>
>
>
> Please refer to previous posts on general voice quality optimization when
> using the SA-AMSAT payload on SO-67.
>
>
>
> I will request Gladys Magagula at the Satellite Application Centre to obtain
> regular schedules from the regional coordinators as soon as possible. We
> will start off with day passes only, transmit on 2.5W and see how things go.
>
>
>
> Enjoy!
>
>
>
> Regards
> Jan-Albert
>
>
>
> ________________________________________
>
> Jan-Albert Koekemoer, PrEng
>
> Sun Space& Information Systems (Pty) Ltd.
>
> Stellenbosch, South Africa
>
> www.sunspace.co.za<http://www.sunspace.co.za>
>
> +27 21 880 8117 (tel)
>
> +27 83 461 6643 (cell)
>
> +27 21 880 1703 (fax)
>
>
>
>
>
> E-mail Disclaimer
> http://www.sunspace.co.za/emaildisclaimer.htm
>
> _______________________________________________
> 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
>
>
>
--
Amateur Radio Station ON4HF
Eric Knaps
Satellite manager UBA
Tel. +32472985876 (mobile)
http://www.on4hf.be
------------------------------
Message: 15
Date: Mon, 21 Jun 2010 11:30:46 -0700 (PDT)
From: George Henry <ka3hsw@xxx.xxx>
Subject: [amsat-bb] Re: SO-67 back on air!
To: Jan-Albert Koekemoer <jan.koekemoer@xxxxxxxx.xx.xx>, AMSAT
<amsat-bb@xxxxx.xxx>
Message-ID: <586672.15649.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
Please consider making it available for all passes over N. America this
weekend (1800Z 26 June to 2100Z 27 June) for ARRL and AMSAT Field Day use...
73,
George, KA3HSW
----- Original Message ----
> From: Jan-Albert Koekemoer <jan.koekemoer@xxxxxxxx.xx.xx>
> To: amsat-bb@xxxxx.xxx
> Cc: Gladys Magagula <GMagagula@xxxx.xx.xx>; sumbandila@xxxxxxxxxxxx.xxxx
Hans van de Groenendaal <hans@xxxxxxx.xx.xx>
> Sent: Mon, June 21, 2010 9:04:52 AM
> Subject: [amsat-bb] SO-67 back on air!
>
> Hello
After much delay we are now in a position to re-activate
> the SA-AMSAT payload
schedules on a regular basis again!?
------------------------------
Message: 16
Date: Mon, 21 Jun 2010 20:55:40 +0200
From: "PE0SAT" <pe0sat@xxxxx.xx>
Subject: [amsat-bb] Re: SO-67 back on air!
To: "Eric Knaps, ON4HF" <on4hf@xxxxxxx.xx>
Cc: Jan-Albert Koekemoer <jan.koekemoer@xxxxxxxx.xx.xx>, Gladys
Magagula <gmagagula@xxxx.xx.xx>, amsat-bb@xxxxx.xxxxxxxxx van de
Groenendaal <hans@xxxxxxx.xx.xx>, sumbandila@xxxxxxxxxxxx.xxx
Message-ID: <20100621185540.50C6E23002@xx.xxxxx.xx>
Content-Type: text/plain;charset=iso-8859-1
On Mon, June 21, 2010 20:01, Eric Knaps, ON4HF wrote:
> Hi there,
Hi Eric,
>
> Do you really think that the European alligators will wait for 3 seconds?
>
I rest my case :))
Perhaps when the crocodiles have read this, things wil change?
Some self-reflection would be appropriate ...
73 Jan PE0SAT
> Op 21/06/2010 16:04, Jan-Albert Koekemoer schreef:
>> Hello
>>
>>
>>
>> After much delay we are now in a position to re-activate the SA-AMSAT
>> payload
>> schedules on a regular basis again!
>>
>>
>>
>> During the downtime we conducted several experiments in order to
>> investigate
>> possible alternatives for the "cut-off" problem experienced by many at
>> the
>> end of last year / beginning of this year. The cut-off is caused by SW
>> running on piggyback electronics that continues to gate the received
>> audio
>> onto the transmitter for about 3s after a specific ground transmission
>> has
>> ended, whereafter the received audio is cut off. The SW then waits for
>> the
>> next ground transmission with a valid "transponder" tone embedded,
>> before
>> gating the audio onto the transmitter again. So if a second
>> transmission
>> starts within the 3s "tail" period, it will be cut off when the 3s
>> expires.
>> Listen to this mp3 recording as an example: http://tinyurl.com/38vvg3o
>>
>>
>>
>> Unfortunately the piggyback electronics does not have reprogramming
>> functionality, so we are not able to change the SW. We did however
>> manage to
>> implement a mechanism on the satellite transponder (used by the
>> piggyback)
>> that should be of some assistance when using the payload: the PTT of
>> the
>> transmitter now STAYS ON for the duration of the payload activation
>> (i.e. 15
>> min), regardless of a valid "transponder" tone received. Note that this
>> does
>> not get rid of the "cut-off" problem, nor of the requirement to embed a
>> valid
>> tone when you want to use the payload - see detailed explanation below.
>>
>>
>>
>> The following example depicts the ideal usage scenario of the payload:
>>
>> 1. As the satellite comes over the horizon, an unmodulated carrier
>> ("quieting") will be received by all on UHF
>>
>> 2. Person A starts to transmit on VHF (with valid "transponding"
>> tone
>> embedded in the transmission) and the transmission is relayed on UHF
>>
>> 3. When Person A releases his/her PTT, the satellite will continue
>> to
>> transmit what it is receiving (usually this will be "noise") for a
>> further
>> ?3s. Nobody should start to transmit during this time!
>>
>> 4. At the end of the ?3s period, everybody will again hear the
>> unmodulated carrier.
>>
>> 5. NB: only when this unmodulated carrier is heard should Person B
>> start to transmit. Listen to this mp3 recording as an example of valid
>> usage: http://tinyurl.com/32rjbxm
>>
>>
>>
>> I suppose this will take some getting use to - at least the system has a
>> built-in "punishment" mechanism for the impatient! ;-)
>>
>>
>>
>> Please refer to previous posts on general voice quality optimization
>> when
>> using the SA-AMSAT payload on SO-67.
>>
>>
>>
>> I will request Gladys Magagula at the Satellite Application Centre to
>> obtain
>> regular schedules from the regional coordinators as soon as possible.
>> We
>> will start off with day passes only, transmit on 2.5W and see how things
>> go.
>>
>>
>>
>> Enjoy!
------------------------------
_______________________________________________
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 5, Issue 274
****************************************
Read previous mail | Read next mail
| |
