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CX2SA > SATDIG 29.11.12 21:02l 517 Lines 18249 Bytes #999 (0) @ WW
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Sent: 121129/2002Z @:CX2SA.SAL.URY.SA #:976 [Salto] FBB7.00e $:AMSATBB7394
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To : SATDIG@WW
Today's Topics:
1. ESTCube-1 and Aalto-1 (Trevor .)
2. Re: ESTCube-1 and Aalto-1 (Bob- W7LRD)
3. Re: ESTCube-1 and Aalto-1 (Trevor .)
4. G5400B Rotor Problem (tokens@xxxxxxx.xxxx
5. Re: G5400B Rotor Problem (i8cvs)
6. Re: G5400B Rotor Problem (Alan)
7. Microwave brick oscillators (Lizeth Norman)
8. Re: Microwave brick oscillators (Art McBride)
9. Re: az-rotor (Erich Eichmann)
10. Re: G5400B Rotor Problem (John Wright)
11. Re: G5400B Rotor Problem (i8cvs)
----------------------------------------------------------------------
Message: 1
Date: Wed, 28 Nov 2012 20:29:07 +0000 (GMT)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] ESTCube-1 and Aalto-1
Message-ID:
<1354134547.87838.YahooMailClassic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
2013 PSLV Launch for ESTCube-1 CubeSat
http://www.uk.amsat.org/?p=11707
Finlands First CubeSat Aalto-1 - 2013?
http://www.uk.amsat.org/?p=11702
73 Trevor M5AKA
AMSAT-UK http://www.amsat-uk.org/
----
------------------------------
Message: 2
Date: Wed, 28 Nov 2012 20:45:05 +0000 (UTC)
From: Bob- W7LRD <w7lrd@xxxxxxx.xxx>
To: "Trevor ." <m5aka@xxxxx.xx.xx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: ESTCube-1 and Aalto-1
Message-ID:
<1545149091.203135.1354135505403.JavaMail.root@xxxxxxx.xxxxxxxxxx.xx.xxxx.xxxx
xxx.xxx>
Content-Type: text/plain; charset=utf-8
no transponders?
Bob W7LRD
----- Original Message -----
From: "Trevor ." <m5aka@xxxxx.xx.xx>
To: amsat-bb@xxxxx.xxx
Sent: Wednesday, November 28, 2012 12:29:07 PM
Subject: [amsat-bb] ESTCube-1 and Aalto-1
2013 PSLV Launch for ESTCube-1 CubeSat
http://www.uk.amsat.org/?p=11707
Finlands First CubeSat Aalto-1 - 2013?
http://www.uk.amsat.org/?p=11702
73 Trevor M5AKA
AMSAT-UK http://www.amsat-uk.org/
----
_______________________________________________
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: Wed, 28 Nov 2012 20:57:55 +0000 (GMT)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
To: Bob- W7LRD <w7lrd@xxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: ESTCube-1 and Aalto-1
Message-ID:
<1354136275.99370.YahooMailClassic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
--- On Wed, 28/11/12, Bob- W7LRD <w7lrd@xxxxxxx.xxx> wrote:
> no transponders? Bob W7LRD
No transponders on those Cubesats but Spring/Summer 2013 should see the
launch of 3 CubeSats carrying 435/145 linear transponders, 1 CubeSat
carrying a 145/435 linear transponder and several CubeSats carry 435/145
AO-16 style FM-DSB transponders.
73 Trevor M5AKA
------------------------------
Message: 4
Date: Wed, 28 Nov 2012 16:00:16 -0500
From: <tokens@xxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] G5400B Rotor Problem
Message-ID: <BFCCB87AD6594630A3FB788E18857695@xxxx>
Content-Type: text/plain; charset="utf-8"
Got some unexpected time today to look at the rotor. First I set the output
at pin 6 of the external control output jack to 5.0 V. Then I got readings
every 45 deg from 180 at the left to 180 on the right. The readings are of
course subject to parallax in reading the needle. Readings from 180 on the
left to 180 on the right were 0.024, 0.606, 1.270, 1.864, 2.489, 3.074,
3.690, 4.350, and 5.000 V. The difference in voltage from reading to reading
varied from 0.582 to 0.660 V. From left to right they were 0.582, 0.664,
0.594, 0.625, 0.585, 0.616, 0.660, 0.650. I then took resistance readings on
the 500 ohm pot in the rotor (removing connection from control box each
time). Starting at the left resistance from 1-2, 1-3, 2-3 were 415, 416, and
1.7 ohms. With the rotor halfway around (360) (dial reading 345) resistance
from 1-2, 1-3, 2-3 were 241.7, 416, and 176.1 ohms. With the dial at 360
resistance from 1-2, 1-3, 2-3 were 220.4, 413, and 193.6 ohms. With the dial
at the right 1!
80 resistance from 1-2, 1-3, 2-3 were 30.4, 414, and 383 ohms. First
observation is that the pot in the rotor is considerably less than 500 ohms.
Next with either the rotor being halfway around or the dial reading as if it
were halfway around I would expect the 1-2 and 2-3 readings of the pot to be
somewhat similar but they are not. So, are these results glaringly pointing
to the 500 ohm pot as the culprit? Or does someone see something else?
I?d appreciate any opinions on this. Thank you once again.
73 Al W8KHP
------------------------------
Message: 5
Date: Wed, 28 Nov 2012 22:54:28 +0100
From: "i8cvs" <domenico.i8cvs@xxx.xx>
To: <tokens@xxxxxxx.xxx>, "Amsat - BBs" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: G5400B Rotor Problem
Message-ID: <000001cdcdb3$35d7fd40$0401a8c0@xxxxxx>
Content-Type: text/plain; charset="utf-8"
Hi Al, W8KHP
Normally I have seen the resistance of the potentiometer to be less than 500
ohm but this is not extremely important.
BTW is very important that the potentiometer is linear.
I suggest to rotate the azimut just mid way of it's travel i/e 180? one side
and 180? to the other side up to both the mechanical stops.
Disconnect the wires A1 A2 A3 from the rear of control box and than
measure the resistance between A1 and A3 as well the resistance between
A2 and A3
If the potentiometer is in good shape both resistance readings must be the
same value less than 250 ohm each side but the same value.
Have fun
73" de
i8CVS Domenico
----- Original Message -----
From: <tokens@xxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Wednesday, November 28, 2012 10:00 PM
Subject: [amsat-bb] G5400B Rotor Problem
> Got some unexpected time today to look at the rotor. First I set the
output at pin 6 of the external control output jack to 5.0 V. Then I got
readings every 45 deg from 180 at the left to 180 on the right. The readings
are of course subject to parallax in reading the needle. Readings from 180
on the left to 180 on the right were 0.024, 0.606, 1.270, 1.864, 2.489,
3.074, 3.690, 4.350, and 5.000 V. The difference in voltage from reading to
reading varied from 0.582 to 0.660 V. From left to right they were 0.582,
0.664, 0.594, 0.625, 0.585, 0.616, 0.660, 0.650. I then took resistance
readings on the 500 ohm pot in the rotor (removing connection from control
box each time). Starting at the left resistance from 1-2, 1-3, 2-3 were 415,
416, and 1.7 ohms. With the rotor halfway around (360) (dial reading 345)
resistance from 1-2, 1-3, 2-3 were 241.7, 416, and 176.1 ohms. With the dial
at 360 resistance from 1-2, 1-3, 2-3 were 220.4, 413, and 193.6 ohms. With
the dial at the right 180 resistance from 1-2, 1-3, 2-3 were 30.4, 414, and
383 ohms. First observation is that the pot in the rotor is considerably
less than 500 ohms. Next with either the rotor being halfway around or the
dial reading as if it were halfway around I would expect the 1-2 and 2-3
readings of the pot to be somewhat similar but they are not. So, are these
results glaringly pointing to the 500 ohm pot as the culprit? Or does
someone see something else?
>
> I?d appreciate any opinions on this. Thank you once again.
>
> 73 Al W8KHP
> _______________________________________________
> 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: 6
Date: Wed, 28 Nov 2012 16:01:39 -0600
From: Alan <wa4sca@xxxxx.xxx>
To: <tokens@xxxxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: G5400B Rotor Problem
Message-ID: <BB2554F938B34957A95519C493DA9419@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Al,
The output from pin 6 parallels nicely the meter reading. If you do a
linear fit:
Measured Calculated
.024 .0062
.606 .626
1.27 1.25
1.864 1.865
2.489 2.48
3.074 3.10
3.69 3.72
4.35 4.34
5.00 4.96
Those variances are all within the 4% accuracy claimed. This implies the
meter electronics are good, or at least consistent in reporting what the pot
is telling them. However,
>> The difference in voltage from reading to reading varied from 0.582 to
0.660 V. From left to right they were 0.582, 0.664, 0.594, 0.625, 0.585,
0.616, 0.660, 0.650.
Apologies, but I am not clear on what this means. It does represent
approximately 45 degrees.
The fact that the pot total resistance is less than 500 ohms, and the fact
that it has a jump (non-linearity) in the readings, implies there is a
shorted section in the pot
Alan
WA4SCA
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of tokens@xxxxxxx.xxx
Sent: Wednesday, November 28, 2012 3:00 PM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] G5400B Rotor Problem
Got some unexpected time today to look at the rotor. First I set the output
at pin 6 of the external control output jack to 5.0 V. Then I got readings
every 45 deg from 180 at the left to 180 on the right. The readings are of
course subject to parallax in reading the needle. Readings from 180 on the
left to 180 on the right were 0.024, 0.606, 1.270, 1.864, 2.489, 3.074,
3.690, 4.350, and 5.000 V. The difference in voltage from reading to reading
varied from 0.582 to 0.660 V. From left to right they were 0.582, 0.664,
0.594, 0.625, 0.585, 0.616, 0.660, 0.650. I then took resistance readings on
the 500 ohm pot in the rotor (removing connection from control box each
time). Starting at the left resistance from 1-2, 1-3, 2-3 were 415, 416, and
1.7 ohms. With the rotor halfway around (360) (dial reading 345) resistance
from 1-2, 1-3, 2-3 were 241.7, 416, and 176.1 ohms. With the dial at 360
resistance from 1-2, 1-3, 2-3 were 220.4, 413, and 193.6 ohms. With the dial
at the right 180 resistance from 1-2, 1-3, 2-3 were 30.4, 414, and 383 ohms.
First observation is that the pot in the rotor is considerably less than 500
ohms. Next with either the rotor being halfway around or the dial reading as
if it were halfway around I would expect the 1-2 and 2-3 readings of the pot
to be somewhat similar but they are not. So, are these results glaringly
pointing to the 500 ohm pot as the culprit? Or does someone see something
else?
I'd appreciate any opinions on this. Thank you once again.
73 Al W8KHP
_______________________________________________
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: 7
Date: Wed, 28 Nov 2012 21:02:19 -0500
From: Lizeth Norman <normanlizeth@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Microwave brick oscillators
Message-ID:
<CAJUhCTPLrS9vNeT=Vg5i1-rWj0XcNfrwuN_6UJcPupbYPCOu7A@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hi all!
Anyone have any experience with said units made by California
Microwave and Harris?
I do have a general idea how they work and would like to drive them
with a signal generator for lab use and testing for now.
Any ideas? I have pulled the crystal and know which pads drive. how do
I go from a signal generator to a crystal input?
Norm
------------------------------
Message: 8
Date: Wed, 28 Nov 2012 21:12:42 -0800
From: "Art McBride" <kc6uqh@xxx.xxx>
To: "'Lizeth Norman'" <normanlizeth@xxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Microwave brick oscillators
Message-ID: <A022DB51D5894DFB937D0A41FAB7539A@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Norm,
A few pF cap to the input side of the oscillator and a +10 dBm level signal
should work.
Art,
KC6UQH
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Lizeth Norman
Sent: Wednesday, November 28, 2012 6:02 PM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Microwave brick oscillators
Hi all!
Anyone have any experience with said units made by California
Microwave and Harris?
I do have a general idea how they work and would like to drive them
with a signal generator for lab use and testing for now.
Any ideas? I have pulled the crystal and know which pads drive. how do
I go from a signal generator to a crystal input?
Norm
_______________________________________________
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, 29 Nov 2012 07:52:15 +0100
From: "Erich Eichmann" <erich.eichmann@xxxxxxxx.xx>
To: <tokens@xxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: az-rotor
Message-ID: <5CA8F315040B4F088449F96D89FA171C@xxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Hello Al,
you wrote:
> The problem is that half way through, when it should read 360 it reads 345.
> There is a nonlinearity in the readout.
>
I made and make the same observation with the KR-600X, the AZ rotor of my
KR-5600A rotor combination. The KR-600X is completely equal with the AZ
rotor of the G-5400B combination regarding control box and wire poti in the
rotor (Yaesu took over the Kenpro rotor production and replaced the "KR" by
"G").
When I first added rotor control to my tracking software years ago I mounted
the KR-600X in the shack over a big 360? linear scale with 1 m diameter and
with a pointer that moved around the scale close above it. The rotor ran
exactly an 360? turn from the starting position 180? in the south to the
end position 180?. In the software I entered 180 for the start positon and
179.9 for the end position. I could adjust the meter so that it also moved
exactly into the start and end position, after I had adjusted the rotor
interface poti and the "Out Voltage" poti at the control box. .
Then I entered 360? (rsp. 0?) as target position. The rotor moved exactly to
that position, the pointer pointed exactly to the opposite direction of the
starting position. The meter however pointed to about 342?, so it was wrong
by about 15? to 20?. The situation is the same until today. The maximum of
the deviation is in the middle of the scale.
So, by my experience and at least in my case the wire poti in the rotor is
very linear, but the meter is not.
I agree with Domenico, that the linearity of the poti is important.
73s, Erich, DK1TB
----- Original Message -----
From: <tokens@xxxxxxx.xxx>
To: <APBIDDLE@xxxxxxx.xxx>; <amsat-bb@xxxxx.xxx>
Sent: Sunday, November 25, 2012 10:00 PM
Subject: [amsat-bb] Re: G5400B Rotor Problem
> Alan,
>
> Thanks for the answers. The rotor goes through its 360 just fine. The
> problem is that half way through, when it should read 360 it reads 345.
> There is a nonlinearity in the readout.
>
> 73,
> Al W8KHP
>
------------------------------
Message: 10
Date: Thu, 29 Nov 2012 16:40:32 +0000
From: John Wright <ham@xxxxx.xx.xx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: G5400B Rotor Problem
Message-ID: <0MIgBs-1TgK5f2oUC-002Z44@xxxxxxxx.xxxxxxxxxxxx.xx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 21:00 28/11/2012, you wrote:
>Got some unexpected time today to look at the rotor. First I set the
>output at pin 6 of the external control output jack to 5.0 V. Then I
>got readings every 45 deg from 180 at the left to 180 on the right.
>The readings are of course subject to parallax in reading the
>needle. Readings from 180 on the left to 180 on the right were
>0.024, 0.606, 1.270, 1.864, 2.489, 3.074, 3.690, 4.350, and 5.000 V.
Draw a graph of AZ vs Voltage... It should be a straight line, if
not, the pot is not linear!
------------------------------
Message: 11
Date: Thu, 29 Nov 2012 20:22:52 +0100
From: "i8cvs" <domenico.i8cvs@xxx.xx>
To: "Amsat - BBs" <amsat-bb@xxxxx.xxx>, "John Wright"
<ham@xxxxx.xx.xx>, "Erich Eichmann" <erich.eichmann@xxxxxxxx.xx>
Subject: [amsat-bb] Re: G5400B Rotor Problem
Message-ID: <003d01cdce66$ee32b8e0$0401a8c0@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
---- Original Message -----
From: "John Wright" <ham@xxxxx.xx.xx>
To: <amsat-bb@xxxxx.xxx>
Sent: Thursday, November 29, 2012 5:40 PM
Subject: [amsat-bb] Re: G5400B Rotor Problem
> At 21:00 28/11/2012, you wrote:
> >Got some unexpected time today to look at the rotor. First I set the
> >output at pin 6 of the external control output jack to 5.0 V. Then I
> >got readings every 45 deg from 180 at the left to 180 on the right.
> >The readings are of course subject to parallax in reading the
> >needle. Readings from 180 on the left to 180 on the right were
> >0.024, 0.606, 1.270, 1.864, 2.489, 3.074, 3.690, 4.350, and 5.000 V.
>
>
> Draw a graph of AZ vs Voltage... It should be a straight line, if
> not, the pot is not linear!
>
Hi John, G4DMF
I agree with you and draw a graph of AZ versus Voltage to see if it is
or not a straight line is a very good idea but you don't want to read
the AZ on the control-box meter because the meter can be not linear.
BTW the idea to read the AZ as Erich DK1TB did is to me the best
procedure.
In a previous message on Amsat-BB Erich writes :
----- Original Message -----
From: "Erich Eichmann" <erich.eichmann@xxxxxxxx.xx>
To: <tokens@xxxxxxx.xxx>
Cc: <amsat-bb@xxxxx.xxx>
Sent: Thursday, November 29, 2012 7:52 AM
Subject: [amsat-bb] Re: az-rotor
< snip>
I mounted the KR-600X in the shack over a big 360? linear scale with 1 m
diameter and with a pointer that moved around the scale close above it. The
rotor ran exactly an 360? turn from the starting position 180? in the south
to the end position 180?.
--------------------------------------------------
73" de
i8CVS Domenico
------------------------------
_______________________________________________
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 7, Issue 394
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