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CX2SA > SATDIG 17.09.08 03:17l 901 Lines 31951 Bytes #999 (0) @ WW
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Sent: 080917/0113Z @:CX2SA.LAV.URY.SA #:34195 [Minas] FBB7.00e $:34195_CX2SA
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. replacement pots (George Burr)
2. Re: replacement pots (Alan)
3. Re: Question about Circulair Polarisation (i8cvs)
4. BOD and President (Bruce)
5. Andy W5ACM is fine - Re: BOD and President (Andy MacAllister)
6. Re: Andy W5ACM is fine - Re: BOD and President (David Donaldson)
7. Re: DO-64 (Wouter Jan Ubbels)
8. AO-51 L/U (Mineo Wakita)
9. Marex in Moscow, future ISS stuff (MM)
10. OLPC-HYPERTERM-PICOCOM (Mr Jeffrey L Ross)
11. Re: replacement pots (i8cvs)
12. AO-16 update 9/16/2008 (Mark L. Hammond)
13. Re: DO-64 (JW)
14. OLD Direct TV Sat Dish (Mr Jeffrey L Ross)
----------------------------------------------------------------------
Message: 1
Date: Mon, 15 Sep 2008 22:03:10 -0400
From: George Burr <gaburr(AT)magma.ca>
Subject: [amsat-bb] replacement pots
To: amsat-bb(AT)amsat.org
Message-ID: <20080916020340.89G23eZ00WYey(AT)mailbox6.ucsd.edu>
Content-Type: text/plain; charset="us-ascii"; format=flowed
I found the pots on the old Kenpro rotors to be none standard.
The mounting hole and the turning shaft are smaller than standard and
this could require some more work to fit a "standard " pot because of
the gearing.
I don't know if this is true for the G5400.
73 Geo.
Amsat# 26245
------------------------------
Message: 2
Date: Mon, 15 Sep 2008 21:16:34 -0500
From: "Alan" <ve4yz(AT)mts.net>
Subject: [amsat-bb] Re: replacement pots
To: "'George Burr'" <gaburr(AT)magma.ca>, <amsat-bb(AT)amsat.org>
Message-ID: <0069321D00CA40BD8EAFCE97D9C3BC42(AT)athlon>
Content-Type: text/plain; charset="us-ascii"
In about 2 weeks I'll have an AZ and EL on the bench and check measurements.
All the bolts on my Yaesu/Kenpro 5400 rotators are metric so the shaft on
the pot may also be metric.
We will see.
-----Original Message-----
From: amsat-bb-bounces(AT)amsat.org [mailto:amsat-bb-bounces(AT)amsat.org] On
Behalf Of George Burr
Sent: September 15, 2008 9:03 PM
To: amsat-bb(AT)amsat.org
Subject: [amsat-bb] replacement pots
I found the pots on the old Kenpro rotors to be none standard.
The mounting hole and the turning shaft are smaller than standard and this
could require some more work to fit a "standard " pot because of the
gearing.
I don't know if this is true for the G5400.
73 Geo.
Amsat# 26245
_______________________________________________
Sent via AMSAT-BB(AT)amsat.org. 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: Tue, 16 Sep 2008 04:46:14 +0200
From: "i8cvs" <domenico.i8cvs(AT)tin.it>
Subject: [amsat-bb] Re: Question about Circulair Polarisation
To: "pe0sat" <pe0sat(AT)vgnet.nl>, "AMSAT-BB" <amsat-bb(AT)amsat.org>
Message-ID: <003701c917a6$633382e0$0201a8c0(AT)tin.it>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "pe0sat" <pe0sat(AT)vgnet.nl>
To: <amsat-bb(AT)amsat.org>
Sent: Monday, September 15, 2008 9:47 PM
Subject: [amsat-bb] Question about Circulair Polarisation
>
> Hello,
>
> Can I achive circular polarization the following way?
Hi Jan, PE0SAT
Your drawing is not clear to me because I cannot understand from it how
both dipoles are mounted one with respect to the other over the boom.
>
> >From each dipole a length off aircell-7 to a dual power splitter with one
> length being a quarter wave length longer than the other?
>
> Dipool 50ohm ------------ | |
> splitter --------------- transceiver 50ohm
> Dipool 50ohm --------------- | |
>
> I made one lenght longer following this calculation:
> lambda/4 * V that gave a lenght of 0.690/4 x 0.83 = 0.143m
> for Aircell-7 coax cable.
>
If both dipoles are mounted crossed + or X i.e. at 90 degrees one to the
other and over the same physical plane then using a 1/4 electrical wave
as a delay line as you correctly calculated a circular polarization is
generated.
> Now switching the coax between the dipoles I will get LHCP or RHCP.
It is correct only in theory because in 70 cm the distance from the vertical
to the horizontal elements over the boom is 2 or 3 cm representing a
considerable fraction of 1/4 wavelenght that must be compensated trimming
the lenght of the delay line but the lenght must increased for one sense of
polarization and decreased by the same amount for the opposite polarization.
This is why the method to space the elements by a 1/4 freespace wavelenght
over the boom is preferred.
In this latter case adding a 1/2 electrical wavelenght to the front dipole
nearest to the satellite reverses the sense of polarization without need of
any additional compensations.
>
> Is there anything wrong in this approach?
If both dipoles are at 90? one to the other and the elements are mounted
over the same plane with a minimum of mechanical distance over the boom
it can be accepted with a certain deviation over the perfect circularity.
> My reason for asking, is the
> fact that now in fixed RHCP position, AO-51 is very weak, weaker then
> before when I used a vertical placed yagi. (see
> http://www.ham.vgnet.nl/?Blog:Sept_2008 for more detail)
>
Are you sure that the delay line is connected to get RHCP ?
What reasoning you did connecting cables to the dipoles to establish
the expected sense of polarization ?
Looking at your website it seems that you are using a Cue Dee antenna but
the definition of the photos is low so that even enlarging the picture it is
impossible to see how the arms of both gamma-match are oriented and
this is very important to determine which sense of polarization you can
achive connecting the delay line to one dipole or to the other one.
In addition the gamma match system is not recommended particularly
for 70 cm and a folded dipole with a 1/2 electrical wavelenght coax balun
4/1 ratio is a more efficient radiator.
> 73's PE0SAT
>
73" de
i8CVS Domenico
------------------------------
Message: 4
Date: Mon, 15 Sep 2008 21:55:24 -0500
From: Bruce <kk5do(AT)arrl.net>
Subject: [amsat-bb] BOD and President
To: "amsat-bb(AT)amsat.org" <amsat-bb(AT)amsat.org>
Message-ID: <82508DF4-29E8-4280-8AF4-B9E9FC8CFDE4(AT)arrl.net>
Content-Type: text/plain; charset=us-ascii; format=flowed; delsp=yes
The new president could wind up being a lame duck ... here is why.
the board elects the president at the first board meeting of the new
board. typically it is someone on the board. typically you are elected
to the board and over your years of service on the board are groomed
(so to speak) to be president. you learn the workings of the
organization etc.
there are 7 board members with voting capabilites. there is one
alternate (cannot vote). if all board members are present for a vote,
there should never be a tie unless one member abstains.
now, let's say that someone not on the board (with voting rights) is
elected president. he will only have a vote in order to decide a tie,
thus never being able to offer a measure for vote, never being able to
second a measure and never being able to vote on it.
wouldn't that make the president ineffective and a lame duck?
btw things are fun here in Houston/Harris county. my house is fine
except no electricity or water so stating at my sons apt which has
everything ( a benefit to living near the medical center ). I have
worked a weeks worth of time in 3 days. the next 4 days will be for
mucho overtime. hope andy and marty are okay have not heard from them.
73...bruce
Sent from my iPhone
------------------------------
Message: 5
Date: Mon, 15 Sep 2008 23:39:33 -0500
From: "Andy MacAllister" <w5acm(AT)swbell.net>
Subject: [amsat-bb] Andy W5ACM is fine - Re: BOD and President
To: "'AMSAT BBS'" <amsat-bb(AT)amsat.org>
Message-ID: <000501c917b6$37e21560$6400a8c0(AT)w5acmathlon>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hi Bruce & AMSAT,
I won't attempt to comment on ducks and such, but will report that all is OK
at W5ACM. I will be ready for the Houston AMSAT Net tomorrow evening, but
with a rather diminished 2M antenna. Prior to the arrival of Ike, I took
everything down except for a dual-band (20M & 40M) inverted V and put a 2M
ground plane in place of the 2M, 70cm, 23cm, 13cm and 10M satellite
antennas. It's not pretty, but it survived the winds. That's a lot more than
I can say for a short section of yard fence and about half of an 80 ft tree
in the front yard. I have spent a lot of time playing with generators,
inverters and electric chain saws. It's back to work as usual, but there are
still a lot of lose ends on the home front. At least I have intermittant
water and electricity most of the time. The phone and internet connections
come and go, but they are mostly good. Out on the streets, the gas lines are
not bad, but they exist. About 20% of the traffic lights work, another 20%
are blinking red. The rest are dark. There are lots of dark areas at night,
exploding transformers and sirens. It's amazing stuff! I now get credit for
being in Houston for Carla (1961), Alicia (1983) and Ike (2008). Perhaps I
should move to Minnesota...
Now we need to hear from Marty. I hope his twisted pair works...
I will see you on the Houston AMSAT Net!
http://www.amsatnet.com
73 de Andy W5ACM
http://www.w5acm.net
----- Original Message -----
From: "Bruce" <kk5do(AT)arrl.net>
To: <amsat-bb(AT)amsat.org>
Sent: Monday, September 15, 2008 9:55 PM
Subject: [amsat-bb] BOD and President
> The new president could wind up being a lame duck ... here is why.
>
> the board elects the president at the first board meeting of the new
> board. typically it is someone on the board. typically you are elected
> to the board and over your years of service on the board are groomed
> (so to speak) to be president. you learn the workings of the
> organization etc.
>
> there are 7 board members with voting capabilites. there is one
> alternate (cannot vote). if all board members are present for a vote,
> there should never be a tie unless one member abstains.
>
> now, let's say that someone not on the board (with voting rights) is
> elected president. he will only have a vote in order to decide a tie,
> thus never being able to offer a measure for vote, never being able to
> second a measure and never being able to vote on it.
>
> wouldn't that make the president ineffective and a lame duck?
>
> btw things are fun here in Houston/Harris county. my house is fine
> except no electricity or water so stating at my sons apt which has
> everything ( a benefit to living near the medical center ). I have
> worked a weeks worth of time in 3 days. the next 4 days will be for
> mucho overtime. hope andy and marty are okay have not heard from them.
>
> 73...bruce
>
> Sent from my iPhone
------------------------------
Message: 6
Date: Tue, 16 Sep 2008 00:41:44 -0500 (CDT)
From: "David Donaldson" <wb7dru(AT)usfamily.net>
Subject: [amsat-bb] Re: Andy W5ACM is fine - Re: BOD and President
To: "'Andy MacAllister'" <w5acm(AT)swbell.net>, "'AMSAT BBS'"
<amsat-bb(AT)amsat.org>
Message-ID: <018201c917bf$0aef0a00$01fea8c0(AT)DAVEBEDROOM>
Content-Type: text/plain; charset="us-ascii"
And Andy saith:
" Perhaps I should move to Minnesota..."
The only thing I can say about that is we don't get the constant 100 mph
winds in a storm...except with straight line, down draft winds from a
supercell and then there is the crap shoot of tornado's and 50 mph north
winds in January with blizzard conditions and windchill at -50 deg F....
Your going to get it either place Andy, keep the Amsat net going from down
there, but come up for a visit, the fall is great and the armed police from
the RNC have left...
Dave, WB7DRU & Navy Mars NNN0AXK
Burnsville, MN
-----Original Message-----
From: amsat-bb-bounces(AT)amsat.org [mailto:amsat-bb-bounces(AT)amsat.org] On
Behalf Of Andy MacAllister
Sent: Monday, September 15, 2008 11:42 PM
To: 'AMSAT BBS'
Subject: [amsat-bb] Andy W5ACM is fine - Re: BOD and President
Hi Bruce & AMSAT,
I won't attempt to comment on ducks and such, but will report that all is OK
at W5ACM. I will be ready for the Houston AMSAT Net tomorrow evening, but
with a rather diminished 2M antenna. Prior to the arrival of Ike, I took
everything down except for a dual-band (20M & 40M) inverted V and put a 2M
ground plane in place of the 2M, 70cm, 23cm, 13cm and 10M satellite
antennas. It's not pretty, but it survived the winds. That's a lot more than
I can say for a short section of yard fence and about half of an 80 ft tree
in the front yard. I have spent a lot of time playing with generators,
inverters and electric chain saws. It's back to work as usual, but there are
still a lot of lose ends on the home front. At least I have intermittant
water and electricity most of the time. The phone and internet connections
come and go, but they are mostly good. Out on the streets, the gas lines are
not bad, but they exist. About 20% of the traffic lights work, another 20%
are blinking red. The rest are dark. There are lots of dark areas at night,
exploding transformers and sirens. It's amazing stuff! I now get credit for
being in Houston for Carla (1961), Alicia (1983) and Ike (2008). Perhaps I
should move to Minnesota...
Now we need to hear from Marty. I hope his twisted pair works...
I will see you on the Houston AMSAT Net!
http://www.amsatnet.com
73 de Andy W5ACM
http://www.w5acm.net
--- Get FREE High Speed Internet from USFamily.Net! --
http://www.usfamily.net/mkt-freepromo.html ---
------------------------------
Message: 7
Date: Tue, 16 Sep 2008 11:18:11 +0200
From: "Wouter Jan Ubbels" <wjubbels(AT)gmail.com>
Subject: [amsat-bb] Re: DO-64
To: "AMSAT BB" <AMSAT-BB(AT)amsat.org>
Message-ID:
<af4c9b1b0809160218y188ac79fmfc0adeaa9872ea77(AT)mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Hi Sebastian,
besides the fact that polarization of your uplink signal may make a
huge difference since the satellite is slowly tumbling, the
transponder has a frequency offset. 435.556MHz actually corresponds to
145.900MHz on the downlink (instead of 435.550). Some people have
reported even higher offsets which are likely to be caused by
temperature dependency of the local oscillators on board the
satellite, so it may help to tune around a bit in order to find your
own downlink, which makes operating the transponder a challenge hi:).
Good luck working DO-64!
73 on behalf of the DO-64 / Delfi-C3 team,
Wouter Jan Ubbels PE4WJ
> I listened to a pass earlier this morning ago over Miami Florida.
> Good strong CW beacon heard throughout the entire pass, down until
> about 1 degree, but still nothing heard on my uplink.
>
> 73 de W4AS
> Sebastian
>
> On Sep 13, 2008, at 12:03 PM, Luc Leblanc wrote:
>
>> On 13 Sep 2008 at 8:15, WILLIAMS MICHAEL wrote:
>>
>>
>>> As usual, the downlink signal gets weak on the second half of the
>>> pass.
>>>
>>> Mike Williams K9QHO
>>
>> Got the same results here i got explanations regarding this signal
>> drop for polarisation change but as the satellite attitude is
>> uncontrolled i tend to believe it's more an effect of the antennas
>> pointing towards the earth station and pointing away than a
>> polarisation
>> issue. This change in the signal level start exactly pass the TCA
>> point and signal degrade up to a point he's drop below the noise?
>>
>> I try to figure out the satellite shape spinning and thumbing in
>> space in regard of the polarisation and it will be very odd that the
>> polarisation change happen just at TCA?
>>
>> Any ideas here?
>>
>
> _______________________________________________
> Sent via AMSAT-BB(AT)amsat.org. 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: 8
Date: Tue, 16 Sep 2008 18:47:52 +0900
From: Mineo Wakita <ei7m-wkt(AT)asahi-net.or.jp>
Subject: [amsat-bb] AO-51 L/U
To: amsat-bb(AT)amsat.org
Message-ID: <FFC917E14975B1ei7m-wkt(AT)asahi-net.or.jp>
Content-Type: text/plain; charset=us-ascii
AO-51 is working now as L/U mode.
But we can not digipeat via PACB-1.
Well, can you access PBBS using WiSP via PECHO-11?
Fm PACB-1 To TIME-1 <UI pid=F0 [DAMA] [EAX25] Len=64 >[09:24:56]
PHT: uptime is 012/05:30:18. Time is Tue Sep 16 09:25:58 2008
Fm PECHO-11 To PBLIST <UI pid=F0 [DAMA] [EAX25] Len=11 >[09:24:56]
PB: Empty.
Fm PACB-1 To TLMS-1 <UI pid=F0 [DAMA] [EAX25] Len=35 >[09:24:57]
C0:0D C1:44 C2:76 C3:2F C4:04 C5:01
Fm PACB-1 To TLMD-1 <UI pid=F0 [DAMA] [EAX25] Len=74 >[09:24:57]
WOD:2 ATP:0 BMW:1 BMS:0 CTS:1 CTN:120 CTL:109 CTE:Sat Sep 20 23:22:21 2008
Fm PACB-1 To LSTAT <UI pid=F0 [DAMA] [EAX25] Len=46 >[09:24:57]
I P:0x13A8 o:0 l:27314 f:27325, d:1 st:6 e:0d
JE9PEL, Mineo Wakita
------------------------------
Message: 9
Date: Tue, 16 Sep 2008 07:40:38 -0700 (PDT)
From: MM <ka1rrw(AT)yahoo.com>
Subject: [amsat-bb] Marex in Moscow, future ISS stuff
To: amsat-bb(AT)amsat.org
Message-ID: <327228.53524.qm(AT)web56403.mail.re3.yahoo.com>
Content-Type: text/plain; charset=utf-8
ISS Amateur Radio Status: September 16, 2008
By Miles Mann WF1F,
Marex in Moscow
MAREX-MG News www.marexmg.org
Manned Amateur Radio Experiment
Hello all:
Another year another ARISS international meeting in some country. This year?s
meeting was held in Moscow (Russia). I have been looking forward to going
back to Moscow; this was my third Amateur Radio space trip to Moscow.
Part of the goal of these meetings is to manager the amateur radio equipment
on ISS and to plan for the future. This years meeting was not as productive
as I had hoped. We were very limited in available meeting time to just two 8
hour days and a few short side meetings. The rest of the time was taken up by
museum and school visits and site seeing tours. I did enjoy the tourist
activities very much and wish I had more time to spend in Russia.
Moscow pictures
http://www.marexmg.org/fileshtml/arissmoscow2008.html
Highlights:
I am not gong to go over all of the topic we discussed. If you need more
information, please review the ARISS meeting notes and presentations.
http://www.amsat.org/amsat/ariss/Meetings/2008_Moscow/Presentations/
Replacement TM-D700:
This was one of the pleasant surprises we received.
There are tentative plans to fly the backup spare Kenwood TM-700 from Russia
to the International Space Station on this months September 9th Progress-30
cargo rocket. The current Kenwood D700 on ISS has been in space since August
2003 and in Powered-On service since December 2003.
In anticipation of Garriott?s upcoming mission in October 2008, the Russian
team decided to fly the spare D700 along with a complete set of cables and
computer interface VOX box into space. In addition to the D700, there are
also plans to fly the Kenwood VC-H1 SSTV image communicator.
Marex Project Proposals:
As usual I went over to propose new projects for ISS to bring the amateur
radio station into the new century.
Out of the 5 projects I proposed there was only interest in the Icom ID-800 D-
Star project. We received tentative approval for this project. The Project
Selection and use committee is still reviewing the project.
My presentation did not go as planned, Murphy?s Law struck in many ways.
Two weeks before the Meeting the time slot allocated for New project proposals
was canceled to be rescheduled at a different time, which would be difficult
since each of the 4 days was fully booked with meetings and activities.
I arrived at the hotel Volga in Moscow at 11:00 am local time on Wednesday,
after traveling for approximately 21 hours (Boston up a 6:00 am for taxi and
security check in, Plane #1, to NY, Plane #2 Moscow). I managed to get 1 or 2
hours sleep on the 10+ year old 767, it looked like the same plane I was on to
Moscow in 1998.
Wednesday was planed as the travel day to unpack rest and get ready for the
meetings on Thursday. During dinner that evening with the ARISS team I was
asked if I was read to present my projects after Dinner at 7pm. A little more
advanced notice would have been helpful. My presentation began around 8:30 pm
and finished around 9:30 pm. I am not sure what I said, since I was sleep
talking. I had been going for 30+ hours on 2 hours of sleep.
Projects are normally presented in front of the ARISS Delegates and members of
the project selection committee. On this night only 1 delegate and 1 PSC
member were present. On Friday there was a recap of the PSC decisions with
the ARISS team present and I had to opportunity to give a short talk after the
decisions has been made.
So what is the next phase of a project selection process you may ask?
And here is the response I received:
?I have a group of D-Star experts reviewing the proposal their report should
be coming out soon. When I get it it will be forwarded to the Project
Selection and Utilization committee for their review.?
I will keep you all informed of our progress with ISS and new projects.
http://www.marexmg.org/fileshtml/futureprojects.html
In the short term, its time to get ready for the possibility of FM Slow Scan
TV (SSTV) during Richard Garrett?s mission in October 2008
Memo Related Links:
Kenwood VC-H1 communicator
http://www.kenwood.com/i/products/info/amateur/vch1.html
Pictures of the Existing Kenwood TM-D700 on ISS
http://www.marexmg.org/hardware/kenwood.html
Pictures of the Amateur Radio station on the International Space Station.
http://www.marexmg.org/fileshtml/radiohardware.html
Slow Scan TV:
The Marex Slow Scan TV project, SpaceCam1 was activated for a few weeks in
August 2006. We hope to see some new images in October 2008
http://www.marexmg.org/imagessstv/SpaceCamImages1.htm
Disclaimer, Hardware and Projects:
As with all payloads and projects going into ISS, the priority of a project
and payload determines its status. If another project comes along with a
higher priority, it is possible that the Amateur radio hardware can be removed
from the flight manifest at any time before launch. We will not know for sure
until a few weeks after launch if the Amateur Radio hardware was actually
shipped to ISS on Progress-30.
This also applies to projects currently on board ISS. Projects can be
activated with little or no notice, such as the SpaceCam1 SSTV project in
August 2006.
Projects can also be packed up and placed in storage on ISS such as the
Erickson HT system. We have to be ready when we hear from Moscow that a
project may be deployed, otherwise we may miss a unique opportunity.
Marexmg Web page
http://www.marexmg.org
73 Miles WF1F MAREX-MG
Let?s keep Space Fun
------------------------------
Message: 10
Date: Tue, 16 Sep 2008 12:33:42 -0400
From: "Mr Jeffrey L Ross" <radiooperator(AT)comcast.net>
Subject: [amsat-bb] OLPC-HYPERTERM-PICOCOM
To: "amsat" <amsat-bb(AT)amsat.org>
Message-ID: <B286C63184274AA8BFC63304E87D8A09(AT)hamshackcomputer>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hi folks, I am real close to getting the OLPC To run a tnc and rig. I found
A software called PICOCOM/MINICOM Thats similar to hyperterm in windows.
Just type yum install picocom or yum install minicom at the terminal
acitivity root. Then type the name to start it. anyone want to work with me
on it contact me off list. Now we can use them for sat work,packet, aprs.
emcom,, etc.
kc8gkf
p.s. how come no one else is working on this? must be busy.
KC8GKF
------------------------------
Message: 11
Date: Tue, 16 Sep 2008 18:47:30 +0200
From: "i8cvs" <domenico.i8cvs(AT)tin.it>
Subject: [amsat-bb] Re: replacement pots
To: "Alan" <ve4yz(AT)mts.net>, "'George Burr'" <gaburr(AT)magma.ca>,
"AMSAT-BB" <amsat-bb(AT)amsat.org>, "'Sammy Jenkis'"
<sammyjenkis8965(AT)msn.com>
Message-ID: <001801c9181b$ea02b780$0201a8c0(AT)tin.it>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Alan" <ve4yz(AT)mts.net>
To: "'George Burr'" <gaburr(AT)magma.ca>; <amsat-bb(AT)amsat.org>
Sent: Tuesday, September 16, 2008 4:16 AM
Subject: [amsat-bb] Re: replacement pots
> In about 2 weeks I'll have an AZ and EL on the bench and check
measurements.
>
> All the bolts on my Yaesu/Kenpro 5400 rotators are metric so the shaft on
> the pot may also be metric.
>
> We will see.
>
> -----Original Message-----
> From: amsat-bb-bounces(AT)amsat.org [mailto:amsat-bb-bounces(AT)amsat.org]
On
> Behalf Of George Burr
> Sent: September 15, 2008 9:03 PM
> To: amsat-bb(AT)amsat.org
> Subject: [amsat-bb] replacement pots
>
> I found the pots on the old Kenpro rotors to be none standard.
> The mounting hole and the turning shaft are smaller than standard and this
> could require some more work to fit a "standard " pot because of the
> gearing.
> I don't know if this is true for the G5400.
> 73 Geo.
> Amsat# 26245
>
Hi Alan, Geo, and All
I have in my hands an original 500 ohm wirewound linear potentiometer as a
spare part for my Kenpro's rotor family and all dimension are metric as
follows:
Outside diameter: 28 mm
Outside thickness: 15 mm
Metal shaft diameter: 6 mm
Metal shaft lenght: 24 mm
Bushing outside diameter: 9 mm
Bushing lenght: 10 mm
Remember that 1" is equivalent to 25.4 mm
The above original potentiometer is custom made and do not carry on the
name of it's manufacturer.
The power rating of it is in the order of 2 watt and it is a 360? continuous
rotation potentiometer using a looped flexible centre wire for the wiper.
By the way I found in internet a Model 5311 single turn wirewound linear
precision potentiometer made by STATE Electronics that can be adapted to
replace the original one with two minor mechanical changes.
The above potentiometer is available with standard resistance of 500 ohm
and a total mechanical travel of 360? for continuous models with
independent linearity of +/- 0.5% and power rating of 2 watt
http://www.potentiometers.com/Series5311.cfm?session_num=2008091501464
http://www.potentiometers.com/pdf/BITC_5311.pdf
The outside diameter of it is 1.312" = 33.33 mm and apparently it can be
accepted into the gear mount plate of the KR-500 rotator but if a rotator is
available open for maintenance the available room for the new diameter of
33.33 mm versus the original one of 28 mm must be checked.
The bushing outside diameter is 3/8" or 10.3 mm so that "probably" the
original hole onto the gear mount plate must be enlarged boring it by only
1.3 mm
The diameter of the metal shaft is 1/4" or 6.342 mm so that the inner
diameter of the pot devider gear must be enlarged boring it by only
0.342 mm
The above precision potentiometer is much better than the original one
because it is totally incapsulated and the mechanical continuous travel of
360? is made without using a looped flexible center wire for the wiper
The original 500 ohm potentiometer from Kempro is very difficult to find
in Italy and if available the cost of it is about 50,00 Euro.
I hope this helps.
73" de
i8CVS Domenico
------------------------------
Message: 12
Date: Tue, 16 Sep 2008 13:20:10 -0400 (EDT)
From: "Mark L. Hammond" <n8mh(AT)embarqmail.com>
Subject: [amsat-bb] AO-16 update 9/16/2008
To: amsat-bb <amsat-bb(AT)amsat.org>
Cc: pacops <pacops(AT)amsat.org>
Message-ID:
<883838396.3945901221585610174.JavaMail.root(AT)pd02.embarq.synacor.com>
Content-Type: text/plain; charset=utf-8
Hello All,
On 15 Sept 2008 at 10:58 UTC I commanded AO-16 ON and put it in voice mode.?
As of the time of this message (16 Sept 2008 at 17:10 UTC), AO-16 is still
being reported as?operational.? That is over 30 hours of continuous uptime,
which is a "good thing."? Our predictions regarding sustained activities seem
to be right on the mark.? Recording your observations about AO-16 at
http://oscar.dcarr.org/ ?has been, and will continue to?be, very helpful to
us.
It is possible that the transmitter will turn OFF; this requires some
commanding to get it running again, which means a pass over the Eastern US
coast is required for a change in status.?? But we're hoping that the bird
will remain ON more often than OFF for the next several weeks.
Illumination projects (and subsequent temperature predictions) suggest that we
might be able to sustain operations until early November.? So, if you want
some AO-16 contacts, you had better get them before then.? After November
2008, it may be a long, long, time before the orbit provides favorable
temperatures for the bird to remain operational for more than a few seconds or
minutes at a time...
Current operational mode for AO-16
Mode FM Voice Repeater ( Downlink is DSB)
Uplink : 145.9200 MHz FM
Downlink 437.0260 MHz SSB
One behalf of the command team,
--
Mark?L.?Hammond?[N8MH]
------------------------------
Message: 13
Date: Tue, 16 Sep 2008 05:02:10 -0400
From: "JW" <ns1z(AT)cfl.rr.com>
Subject: [amsat-bb] Re: DO-64
To: "Sebastian" <w4as(AT)bellsouth.net>, "AMSAT BB" <AMSAT-BB(AT)amsat.org>
Message-ID: <DE674F5B94B049EBB8BE6F56A158F0EB(AT)JohnPC>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
I tried Delfi this weekend as well. As Sebastian stated the CW beacon
was very strong at times. I could never find my signal (or anyone
else's) regardless of how much I tuned.
IC-910 and 40 el uplink, 22 el down and mirage KP2.
----- Original Message -----
From: "Sebastian" <w4as(AT)bellsouth.net>
To: "AMSAT BB" <AMSAT-BB(AT)amsat.org>
Sent: Monday, September 15, 2008 7:21 PM
Subject: [amsat-bb] Re: DO-64
>I listened to a pass earlier this morning ago over Miami Florida.
> Good strong CW beacon heard throughout the entire pass, down until
> about 1 degree, but still nothing heard on my uplink.
>
> 73 de W4AS
> Sebastian
>
> On Sep 13, 2008, at 12:03 PM, Luc Leblanc wrote:
>
>> On 13 Sep 2008 at 8:15, WILLIAMS MICHAEL wrote:
>>
>>
>>> As usual, the downlink signal gets weak on the second half of the
>>> pass.
>>>
>>> Mike Williams K9QHO
>>
>> Got the same results here i got explanations regarding this signal
>> drop for polarisation change but as the satellite attitude is
>> uncontrolled i tend to believe it's more an effect of the antennas
>> pointing towards the earth station and pointing away than a
>> polarisation
>> issue. This change in the signal level start exactly pass the TCA
>> point and signal degrade up to a point he's drop below the noise?
>>
>> I try to figure out the satellite shape spinning and thumbing in
>> space in regard of the polarisation and it will be very odd that the
>> polarisation change happen just at TCA?
>>
>> Any ideas here?
>>
>
> _______________________________________________
> Sent via AMSAT-BB(AT)amsat.org. Opinions expressed are those of the
> author.
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>
------------------------------
Message: 14
Date: Tue, 16 Sep 2008 13:28:03 -0400
From: "Mr Jeffrey L Ross" <radiooperator(AT)comcast.net>
Subject: [amsat-bb] OLD Direct TV Sat Dish
To: "amsat" <amsat-bb(AT)amsat.org>
Message-ID: <C787E2A43E5840B3AC0BFD8233EB9E64(AT)hamshackcomputer>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hi, folks I have a direct tv sat dish and am wondering if I should keep this
or throw it away. Can I use this sometime for sat coms?
KC8GKF
------------------------------
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Sent via amsat-bb(AT)amsat.org. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
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End of AMSAT-BB Digest, Vol 3, Issue 466
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