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CX2SA > SATDIG 22.09.11 20:06l 442 Lines 14216 Bytes #999 (0) @ WW
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Today's Topics:
1. Netbooks again (ANTHONY JAPHA)
2. Re: Amplifier Suggestions? (g0mrf@xxx.xxxx
3. Re: Amplifier Suggestions? (i8cvs)
4. Re: Arissat-1 Voice telemetry analysis from G0SFJ (Greg D.)
5. Re: Amplifier Suggestions? (Art McBride)
6. Re: Amplifier Suggestions? (Tom Clark)
7. FM02 K3NXH/4 AO-51 (Chuck Gress)
8. EM45 (wa4hfn@xxxxxxx.xxxx
9. Sounds of NASA (Clint Bradford)
----------------------------------------------------------------------
Message: 1
Date: Wed, 21 Sep 2011 17:50:52 -0400
From: "ANTHONY JAPHA" <tjjapha@xxxxxxxxx.xxx>
To: "amsat-bb" <amsat-bb@xxxxx.xxx>, "obo" <obo@xxxxx.xxx>, "yccc"
<yccc@xxxx.xxx>
Subject: [amsat-bb] Netbooks again
Message-ID: <380-220119321215052156@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=US-ASCII
All,
I received many helpful comments about the use of netbooks. Thanks to all.
As it turned out, I got an ASUS netbook, which takes more than 5 pounds off
the weight of the equipment used for my occasional portable satellite work.
The hard part was finding a USB to serial port adapter that works. The job
is to run 2 of these adapters to control the frequencies of 2 FT817
transceivers to correct for doppler shift. One FT817 is used for Rx, the
other for Tx. The doppler shifts for Rx and Tx differ. What's needed is
CAT control by SatPC32 software, which is a terrific program. The computer
runs Window 7.
After trying 3 adapters that didn't work, the problem was finally solved by
using the USB to serial adapter made by Sabrent, Item CB-FTDI. This adapter
is sold by Elecraft as the CAT cable for the K3 (Elecraft part KUSB). Now I
have full freq. control to use with the CW/SSB satellites, just as I had
with the much heavier laptop that the netbook replaces. (It needed only 1
adapter because it had a serial port, and an old Radio Shack adapter worked
well.)
73,
Tony, N2UN
------------------------------
Message: 2
Date: Wed, 21 Sep 2011 17:52:25 -0400 (EDT)
From: g0mrf@xxx.xxx
To: jwcutler@xxxxx.xxxx amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Amplifier Suggestions?
Message-ID: <8CE46BFE22B0EBE-1D7C-9810C@xxxxxxxxxxxx.xxxxxx.xxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Hi James.
That is a lot of gain. 10mW to 75W is around 38dB.
If I had this as a problem, I would consider putting two amplifiers together.
For example
http://www.mirageamp.com/pdffiles/D-1010-N.pdf
But include a small amplifier 'brick' to get the drive up from 10mW.
Perhaps the M57721M from RF parts in California. 10mW in and 7 Watts out.
Of course with just 10mW input, your amp will not automatically switch from
RX to TX. - Best to switch manually and not with RF anyway.
Second choice would be to make an amp from scratch. - A quick look at RF
parts again shows 50mW to 60 Watts is available in a single device. -
RA07H4047M. cost is $23 but then a box and some relays and a LPF will be
much more than that.
Thanks
David G0MRF
-----Original Message-----
From: James Cutler <jwcutler@xxxxx.xxx>
To: amsat-bb <amsat-bb@xxxxx.xxx>
Sent: Wed, 21 Sep 2011 17:32
Subject: [amsat-bb] Amplifier Suggestions?
Hello,
We are looking for a UHF amplifier (430-440MHz) for a transceiver to go from
10 mW to ~ 75W. Most of the amps were are funding require a much stronger
input power than we can do. Note, it's a transceiver, so we want to be able
to receive through the system as well. This is for half duplex satellite
communication using a USRP radio.
Do you have any suggested amps?
Thanks,
--James, KF6RFX
_______________________________________________
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: Thu, 22 Sep 2011 00:09:04 +0200
From: "i8cvs" <domenico.i8cvs@xxx.xx>
To: "James Cutler" <jwcutler@xxxxx.xxx>, "Amsat - BBs"
<amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Amplifier Suggestions?
Message-ID: <000001cc78ab$5499ad40$0401a8c0@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "James Cutler" <jwcutler@xxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Wednesday, September 21, 2011 5:04 PM
Subject: [amsat-bb] Amplifier Suggestions?
> Hello,
>
> We are looking for a UHF amplifier (430-440MHz) for a transceiver to go
> from 10 mW to ~ 75W.
> Most of the amps were are funding require a much stronger
> input power than we can do. Note, it's a transceiver, so we want to be
> able to receive through the system as well. This is for half duplex
> satellite communication using a USRP radio.
>
> Do you have any suggested amps?
>
> Thanks,
>
> --James, KF6RFX
Hi James, KF6RFX
75 / 0.01 watt = 7500 time in power or 39 dB in power gain and no commercial
RF amplifier in 70 cm is available to supply such high power gain.
Since you want to be able to receive as well through the system then to add
a postamplifier that would boost the 10 mW to say 5 watt and use this low
power to drive a 75 watt PA it became complicated because of relay switching
the same tranceiver between RX to TX
73" de
i8CVS Domenico
------------------------------
Message: 4
Date: Wed, 21 Sep 2011 20:11:20 -0700
From: "Greg D." <ko6th_greg@xxxxxxx.xxx>
To: <andythomasmail@xxxxx.xx.xx>, <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Arissat-1 Voice telemetry analysis from G0SFJ
Message-ID: <BLU133-W26808EC8F123C0D41C65ADA90C0@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Andy,
I asked a similar question about the battery current earlier, and the reply
from the control team was that the battery is essentially not there - it's
an open circuit - so there really isn't any current flowing at all. What we
are hearing with the minus 8 ma current is really just a slightly offset
"zero" reading. My digital volt meter does the same thing, giving a very
slightly non-zero reading with the probes not connected to anything.
Greg KO6TH
> Date: Wed, 21 Sep 2011 15:03:54 +0100
> From: andythomasmail@xxxxx.xx.xx
> To: amsat-bb@xxxxx.xxx
> Subject: [amsat-bb] Arissat-1 Voice telemetry analysis from G0SFJ
>
> I have submitted for a tlm certificate my analysis of the voice telemetry
from Arissat-1 on certain orbits in September (when I was present, hi).
> The dates of the receptions in September are in the analysis spreadsheet.
>
> The MET is decreasing, I think this is because the satellite comes out of
eclipse and swithches on nearer the observation, as the orbit is precessing
>
> I think the analysis shows that as the MET decreases, the IHU temperature
decreases, and the battery current increases (this is a lesser negative
number).
>
> Put that another way, as the MET in sunlight increases, the IHU
temperature increases and the circuit current decreases (greater negative
number).
>
> However I don't know why the circuit reports a negative current, or even
if the voice tlm is accurate. I'd be grateful for any comments.
>
> 73 de Andy G0SFJ
>
> .
> _______________________________________________
> 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: 5
Date: Wed, 21 Sep 2011 22:11:25 -0700
From: "Art McBride" <kc6uqh@xxx.xxx>
To: "'James Cutler'" <jwcutler@xxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Amplifier Suggestions?
Message-ID: <EA93F25B63E44761A9654A2C7B52F6A6@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
James,
Check out www.rfparts.com
They have several low power amps, 10mw to 7 W most likely you will need two
amps to get to the 75 watt level Select one that is class AB & use an
attenuator in between amps.
Art,
KC6UQH
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of James Cutler
Sent: Wednesday, September 21, 2011 8:04 AM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Amplifier Suggestions?
Hello,
We are looking for a UHF amplifier (430-440MHz) for a transceiver to go from
10 mW to ~ 75W. Most of the amps were are funding require a much stronger
input power than we can do. Note, it's a transceiver, so we want to be able
to receive through the system as well. This is for half duplex satellite
communication using a USRP radio.
Do you have any suggested amps?
Thanks,
--James, KF6RFX
_______________________________________________
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
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------------------------------
Message: 6
Date: Thu, 22 Sep 2011 01:45:22 -0400
From: Tom Clark <k3io@xxxxxxx.xxx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Amplifier Suggestions?
Message-ID: <4E7ACB72.8090505@xxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-15; format=flowed
James, KF6RFX asked:
> We are looking for a UHF amplifier (430-440MHz) for a transceiver to go from
> 10 mW to ~ 75W. Most of the amps were are funding require a much stronger
> input power than we can do. Note, it's a transceiver, so we want to be able
> to receive through the system as well. This is for half duplex satellite
> communication using a USRP radio.
>
> Do you have any suggested amps?
You might want to check with some of the "custom" amateur shops like
Pure RF (http://www.purepowerrf.com/), Downeast Microwave (DEMI,
http://www.downeastmicrowave.com/) or DB6NT
(http://www.kuhne-electronic.de/en/home.html). In particular, DB6NT has
50mw in, ~50w out amplifier
(http://www.kuhne-electronic.de/en/products/power-amplifiers/mku-pa-4047-60-hy
.html)
that is close to what you ask for.
You didn't mention price constraints. Any of the "conventional" amateur
"bricks" are will probably set you back $500-$750. There are some
commercial alternatives you might look at. In particular check out
MiniCircuits; at the $2000 level, the LZY1+
(http://www.minicircuits.com/pdfs/LZY-1+.pdf) has 39+ db gain and will
produce 50 w of RF on either 2M or 70cm. Their older ZHL-50W $1400 brick
(http://www.minicircuits.com/pdfs/ZHL-50W-52.pdf) is also a good unit.
On the MiniCircuits units, I'd strongly advise that you get it with
their BIG heatsink/fan.
You say you need fast half-duplex. I presume that the downlink will be
on a different band (like 2M). If not, the selection of T/R transfer
relays will not be easy, especially if you want to avoid zapping your LNA.
Good luck & 73,
Tom Clark, K3IO
------------------------------
Message: 7
Date: Wed, 21 Sep 2011 14:03:36 -0400
From: Chuck Gress <chuckgress@xxxxxxx.xxx>
To: amsat bulletin board <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] FM02 K3NXH/4 AO-51
Message-ID: <COL120-W52942A9613C96A3B5BAE6BC90D0@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
FYI for those who may be in need of FM02 on AO-51.I will work the 20:09 UTC
pass on Saturday September 24th. ChuckK3NXH
------------------------------
Message: 8
Date: Thu, 22 Sep 2011 14:57:37 +0000 (UTC)
From: wa4hfn@xxxxxxx.xxx
To: AMSAT <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] EM45
Message-ID:
<119050528.465208.1316703457284.JavaMail.root@xxxxxxx.xxxxxxxxxxx.xx.xxxx.xxxx
xxx.xxx>
Content-Type: text/plain; charset=utf-8
If work will allow, I will be on from em45 on AO27 today 9/22
WA4HFN
------------------------------
Message: 9
Date: Thu, 22 Sep 2011 09:40:55 -0700
From: Clint Bradford <clintbradford@xxx.xxx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Sounds of NASA
Message-ID: <EB600820-C904-4DF6-80B1-EC073CC8271E@xxx.xxx>
Content-Type: text/plain; CHARSET=US-ASCII
THE SOUNDS OF NASA AVAILABLE FOR DOWNLOAD
MOFFETT FIELD, Calif. -- Historic and interesting sounds and sound
bites from NASA space missions are available for download as
ringtones or on your computer for events, errors, alarms and
notifications.
The public now can hear the roar of a space shuttle launch or Neil
Armstrong's, "One small step for (a) man, one giant leap for
mankind," every time they get a phone call. A new NASA web page now
has a collection of more than 35 different sounds, each approximately
20 seconds. Examples include:
- Apollo 13's John "Jack" Swigert commenting "Houston, we have a
problem"
- Crackle of the historic last launch of the space shuttle, STS-135
- Segments from President John F. Kennedy's historic moon speech
- Sound wave conversions of the light curve waves created by stars
discovered by NASA's Kepler mission and other sounds of planets and
stars
"NASA has been making historic sounds for over 50 years," said Jerry
Colen, NASA App project manager at the agency's Ames Research Center
in Moffett Field, Calif. "Now we're making some of these memorable
sounds easy to find and use."
The NASA sounds are available in both MP3 and M4R (iPhone) files. NASA
will update the collection as new sounds become available. To listen
to and download the sounds, visit:
http://www.nasa.gov/connect/sounds
The NASA App for Android allows users to easily preview and set the
sounds as ringtones.
To download the most recent version of the NASA App for Android,
visit:
https://market.android.com/details?id=gov.nasa
-end-
Clint Bradford
clintbradford@xxx.xxx
------------------------------
_______________________________________________
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 6, Issue 531
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