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CX2SA > SATDIG 10.09.17 03:41l 796 Lines 28294 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. Re: elev rotor (John Brier)
2. Re: elev rotor (Gregory Beat)
3. Re: elev rotor (Gregory Beat)
4. solar radio astronomy? (skristof@xxxxxxx.xxxx
5. Re: VUCC Awards/Endorsements for August 2017 (Mike Diehl)
6. Upcoming ARISS Contact Schedule as of 2017-09-09 03:00 UTC
(AJ9N@xxx.xxxx
7. Re: elev rotor (Norm n3ykf)
8. Re: elev rotor (David Johnson)
9. g5500 pot (Bob- W7LRD)
10. Making the linear satellites more accessible (Mac A. Cody)
11. Kenwood TS2000X HF/VHF/UHF/1.2ghz satellite radio for sale
(John Geiger)
12. SatPC Error Message when updating Keps (Ken Alexander)
----------------------------------------------------------------------
Message: 1
Date: Fri, 8 Sep 2017 16:10:34 -0400
From: John Brier <johnbrier@xxxxx.xxx>
To: Bob- W7LRD <w7lrd@xxxxxxx.xxx>
Cc: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] elev rotor
Message-ID:
<CALn0fKMMmbSTaQB0Adtp9K4UDX9CUQemYa3m5t2hAyZnJWmxWw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset="UTF-8"
Bob,
I have never used this equipment, but have you tried resetting things
like physical connections or done a computer reboot?
Are you using the AMSAT LVB Tracker? Does it seem to be working?
More information will help others help you.
73, John Brier KG4AKV
On Fri, Sep 8, 2017 at 3:14 PM, Bob- W7LRD <w7lrd@xxxxxxx.xxx> wrote:
> hello
>
> my g5500 works only manually az & el
> no meter indication on elev
> no computer control using Satpc32
> ideas?
> 73 Bob W7LRD
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
expressed
> are solely those of the author, and do not reflect the official views of
AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 2
Date: Fri, 08 Sep 2017 15:31:28 -0500
From: Gregory Beat <w9gb@xxxxxx.xxx>
To: w7lrd@xxxxxxx.xxxx amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] elev rotor
Message-ID: <F46F4E6F-9038-4520-9FA3-5DBD71E14AE3@xxxxxx.xxx>
Content-Type: text/plain; charset=utf-8
Yaesu G-5500 AZ-EL Rotator manual (schematic LAST PAGE)
http://www.radiomanual.info/schemi/ACC_rotator/Yaesu_G-5500_user.pdf
Look at the Yaesu G-5500 Schematic diagram, to start your Troubleshooting.
Parts readily available from Yaesu USA or Electronics Distributors
(Digi-Key, Mouser).
UNPLUG Rotator Controller from AC Line Voltage, before Opening Case.
Have your bench DVM/VOM for testing Diodes within unit.
1. Failure [open] of the Toshiba 1S5188 diodes (D14, D16, D18, D20, D21)
would cause remote control failures -- via DIN 8-pin connector.
2.) The Texas Instruments RC4558, Dual General-Purpose Operational
Amplifier, is active component (Q3 and Q4) for Analog Meter operation. May
have damaged a section of that IC.
==
Toshiba was OEM supplier to Yaesu.
1S1588 is a silicon diode, U = 35V, I = 120mA, applications: fast switch
EIC 1S1588 Data-sheet, High Speed Switching Diode, DO-35 Glass Case, ~35 V
http://www.eicsemi.com/DataSheet/1S1588.PDF
Texas Instruments RC4558 Product Page
http://www.ti.com/product/RC4558
The RC4558 device is a dual general-purpose operational amplifier, with each
half electrically similar to the ?A741, except that offset null capability
is not provided.
Appears you had an ESD event. Lightning strike nearby?
http://www.sunsunsun.net/kd4app/amsat/g5500.htm
Replacement G-5500 Controller from Yaesu USA Parts: $300.00
http://www.yaesu.com/?cmd=contactus
greg
w9gb
===
Date: Fri, 8 Sep 2017 19:14:23 +0000 (UTC)
Hello,
My Yaesu G-5500 works only manually for Azimuth & Elevation
1.) No meter indication on Elevation.
2.) No computer control using SATPC32 application.
Ideas for troubleshooting ?
73 Bob W7LRD
--
------------------------------
Message: 3
Date: Fri, 08 Sep 2017 15:48:40 -0500
From: Gregory Beat <w9gb@xxxxxx.xxx>
To: w7lrd@xxxxxxx.xxxx amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] elev rotor
Message-ID: <CD5C65B1-39F3-4FC0-964E-BBC5BEE5E457@xxxxxx.xxx>
Content-Type: text/plain; charset=utf-8
Noticed differences in Yaesu G-5500 schematic notation.
From the 1998 version:
The 1S1588 diode references should be: D15, D17, D19, and D21
D14, D16, D18, D20 are 1N4002 diodes across the relay coils (RY-x).
w9gb
Sent from iPad Air
> On Sep 8, 2017, at 3:31 PM, Gregory Beat <w9gb@xxxxxx.xxx> wrote:
>
> Yaesu G-5500 AZ-EL Rotator manual (schematic LAST PAGE)
> http://www.radiomanual.info/schemi/ACC_rotator/Yaesu_G-5500_user.pdf
> Look at the Yaesu G-5500 Schematic diagram, to start your Troubleshooting.
> Parts readily available from Yaesu USA or Electronics Distributors
(Digi-Key, Mouser).
>
> UNPLUG Rotator Controller from AC Line Voltage, before Opening Case.
> Have your bench DVM/VOM for testing Diodes within unit.
>
> 1. Failure [open] of the Toshiba 1S1588 diodes (D14, D16, D18, D20, D21)
would cause remote control failures -- via DIN 8-pin connector.
> 2.) The Texas Instruments RC4558, Dual General-Purpose Operational
Amplifier, is active component (Q3 and Q4) for Analog Meter operation. May
have damaged a section of that IC.
> ==
> Toshiba was OEM supplier to Yaesu.
> 1S1588 is a silicon diode, U = 35V, I = 120mA, applications: fast switch
>
> EIC 1S1588 Data-sheet, High Speed Switching Diode, DO-35 Glass Case, ~35 V
> http://www.eicsemi.com/DataSheet/1S1588.PDF
>
> Texas Instruments RC4558 Product Page
> http://www.ti.com/product/RC4558
> The RC4558 device is a dual general-purpose operational amplifier, with
each half electrically similar to the ?A741, except that offset null
capability is not provided.
>
> Appears you had an ESD event. Lightning strike nearby?
> http://www.sunsunsun.net/kd4app/amsat/g5500.htm
>
> Replacement G-5500 Controller from Yaesu USA Parts: $300.00
> http://www.yaesu.com/?cmd=contactus
>
> greg
> w9gb
> ===
> Date: Fri, 8 Sep 2017 19:14:23 +0000 (UTC)
>
> Hello,
> My Yaesu G-5500 works only manually for Azimuth & Elevation
> 1.) No meter indication on Elevation.
> 2.) No computer control using SATPC32 application.
>
> Ideas for troubleshooting ?
> 73 Bob W7LRD
> --
------------------------------
Message: 4
Date: Fri, 08 Sep 2017 17:54:39 -0400
From: skristof@xxxxxxx.xxx
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] solar radio astronomy?
Message-ID: <005461a46573046052f9aeb069c8a457@xxxxxxx.xxx>
Content-Type: text/plain; charset=US-ASCII
Does anybody on this list monitor solar activity at 20.1 MHz? If so,
please contact me off-list. I'm just starting and I'd like to compare
some data I have with data from someone who actually knows what they're
doing.
Thanks!
Steve AI9IN
------------------------------
Message: 5
Date: Fri, 8 Sep 2017 17:46:42 -0700
From: Mike Diehl <diehl.mike.a@xxxxx.xxx>
To: Frank Westphal <k6fw1@xxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] VUCC Awards/Endorsements for August 2017
Message-ID: <756E2D20-E49C-4EA5-B847-3BE807008E00@xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
It's some kind of bug that is taking longer to fix than you would think is
necessary. I made a change to my rules to test some theories and now have
over 200 grids showing as new. Oddly enough, when totaled with awarded it
still does not reflect the correct amount. Any requests on the status seem
to go unanswered by the ARRL.
73,
Mike Diehl
AI6GS
> On Sep 8, 2017, at 11:51 AM, Frank Westphal <k6fw1@xxxxxxx.xxx> wrote:
>
> I did not submit an endorsement so why my total went up by 3 is not known.
I would have to bump my log to LOTW to determine which grids were added to
my total.
>
> Frank
> K6FW
>
>> On 9/8/17 11:29 AM, John Papay wrote:
>> The VUCC Standings list for 8 September 2017 is
>> now sorted by rank rather than by callsign. However,
>> there are problems with the list. This information
>> has been forwarded to the Awards Manager at the ARRL
>> for resolution.
>>
>> Callsigns missing:
>> AI6GS (230)
>> K7TAB (100)
>>
>> Callsigns with totals that went DOWN:
>>
>> KO4MA 1564 -> 1562
>> AC0RA 1143 -> 1142
>> K8TL 974 -> 973
>> AA5PK 876 -> 875
>> W6ZQ 561 -> 560
>> K4XP 102 -> 101
>>
>> Callsigns with totals that only went UP by a few:
>>
>> K6FW 603 -> 606
>> KK4FEM 476 -> 480
>> KL7CN/W6 249 -> 250
>> KX9X 158 -> 159
>> AK4WQ(EN34) 106 -> 107
>> VA3NNA 100 -> 102
>> (The above callsigns could be legitimate endorsements.)
>>
>> Here are the apparent endorsements and new VUCC Satellite
>> Awards issued by the ARRL for the period August 1, 2017
>> through September 8, 2017.
>> Congratulations to all those who made the list this month!
>>
>> CALL GRIDS
>>
>> WA4NVM 1450
>> W5RKN 511
>> N6UK 475
>> AF5CC 314
>> K8BL 252
>> KA9P 175
>> CU3EQ 154
>> FG8OJ 130
>> G7SVF 109 (NEW VUCC)
>> PY2RN 101 (NEW VUCC)
>> VE1QX 100 (NEW VUCC)
>> XE2JA 100 (NEW VUCC)
>>
>> This list was developed by comparing the ARRL .pdf
>> listings for August 1st and September 8th, 2017. It's a visual
>> comparison so omissions are possible. Apologies if your
>> call was not mentioned. Thanks to all those who are
>> roving to grids that are rarely on the birds. They are
>> doing most of the work!
>>
>> 73,
>> John K8YSE
>>
>>
>> ---
>> This email has been checked for viruses by Avast antivirus software.
>> https://www.avast.com/antivirus
>>
>> _______________________________________________
>> Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
>> to all interested persons worldwide without requiring membership.
Opinions expressed
>> are solely those of the author, and do not reflect the official views of
AMSAT-NA.
>> Not an AMSAT-NA member? Join now to support the amateur satellite program!
>> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
expressed
> are solely those of the author, and do not reflect the official views of
AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 6
Date: Sat, 9 Sep 2017 00:37:06 -0400
From: AJ9N@xxx.xxx
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Upcoming ARISS Contact Schedule as of 2017-09-09
03:00 UTC
Message-ID: <1755f.784b91d3.46e4c9f1@xxx.xxx>
Content-Type: text/plain; charset="ISO-8859-1"
Upcoming ARISS Contact Schedule as of 2017-09-09 03:00 UTC
Quick list of scheduled contacts and events:
Meadows Elementary School, Manhattan Beach, CA, direct via KM6BWB
The ISS callsign is presently scheduled to be NA1SS
The scheduled astronaut is Paolo Nespoli IZ?JPA
Contact was successful: Fri 2017-09-08 17:05:30 UTC 67 deg (***)
Live streamed at https://www.youtube.com/watch?v=oRsKV6gBmGU
Beenleigh State High School, Beenleigh, Queensland, Australia, telebridge
via K6DUE
The ISS callsign is presently scheduled to be NA1SS
The scheduled astronaut is Paolo Nespoli IZ?JPA
Contact is a go for: Mon 2017-09-11 12:58:34 UTC 77 deg
Boston Red Sox Outreach to School Groups, Boston, MA, telebridge via W6SRJ
The ISS callsign is presently scheduled to be NA1SS
The scheduled astronaut is Paolo Nespoli IZ?JPA
Contact is a go for: Thu 2017-09-14 15:03:58 UTC 56 deg
****************************************************************************
**
ARISS is always glad to receive listener reports for the above contacts.
ARISS thanks everyone in advance for their assistance. Feel free to send
your reports to aj9n@xxxxx.xxx or aj9n@xxx.xxx.
Listen for the ISS on the downlink of 145.8? MHz.
****************************************************************************
***
All ARISS contacts are made via the Kenwood radio unless otherwise noted.
*********************
**********************************************************
Several of you have sent me emails asking about the RAC ARISS website and
not being able to get in. That has now been changed to
http://www.ariss.org/
Note that there are links to other ARISS websites from this site.
****************************************************************************
Looking for something new to do? How about receiving DATV from the ISS?
If interested, then please go to the ARISS-EU website for complete
details. Look for the buttons indicating Ham Video.
http://www.ariss-eu.org/
If you need some assistance, ARISS mentor Kerry N6IZW, might be able to
provide some insight. Contact Kerry at kbanke@xxxxxxxxx.xxx
****************************************************************************
ARISS congratulations the following mentors who have now mentored over 100
schools:
Satoshi 7M3TJZ with 124
Gaston ON4WF with 123
Francesco IK?WGF with 119
Sergey RV3DR with 100
****************************************************************************
The webpages listed below were all reviewed for accuracy. Out of date
webpages were removed and new ones have been added. If there are
additional
ARISS websites I need to know about, please let me know.
Note, all times are approximate. It is recommended that you do your own
orbital prediction or start listening about 10 minutes before the listed
time.
All dates and times listed follow International Standard ISO 8601 date and
time format YYYY-MM-DD HH:MM:SS
The complete schedule page has been updated as of 2017-09-09 03:00 UTC.
(***)
Here you will find a listing of all scheduled school contacts, and
questions, other ISS related websites, IRLP and Echolink websites, and
instructions for any contact that may be streamed live.
http://www.amsat.org/amsat/ariss/news/arissnews.rtf
http://www.amsat.org/amsat/ariss/news/arissnews.txt
Total number of ARISS ISS to earth school events is 1157. (***)
Each school counts as 1 event.
Total number of ARISS ISS to earth school contacts is 1116. (***)
Each contact may have multiple schools sharing the same time slot.
Total number of ARISS supported terrestrial contacts is 47.
A complete year by year breakdown of the contacts may be found in the
file.
http://www.amsat.org/amsat/ariss/news/arissnews.rtf
Please feel free to contact me if more detailed statistics are needed.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
The following US states and entities have never had an ARISS contact:
Arkansas, Delaware, South Dakota, Wyoming, American Samoa, Guam, Northern
Marianas Islands, and the Virgin Islands.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
QSL information may be found at:
http://www.ariss.org/qsl-cards.html
ISS callsigns: DP?ISS, IR?ISS, NA1SS, OR4ISS, RS?ISS
****************************************************************************
The successful school list has been updated as of 2017-09-09 03:00 UTC.
(***)
http://www.amsat.org/amsat/ariss/news/Successful_ARISS_schools.rtf
Frequency chart for packet, voice, and crossband repeater modes showing
Doppler correction as of 2005-07-29 04:00 UTC
http://www.amsat.org/amsat/ariss/news/ISS_frequencies_and_Doppler_correction
.rtf
Listing of ARISS related magazine articles as of 2006-07-10 03:30 UTC.
http://www.amsat.org/amsat/ariss/news/ARISS_magazine_articles.rtf
Check out the Zoho reports of the ARISS contacts
https://reports.zoho.com/ZDBDataSheetView.cc?DBID=412218000000020415
****************************************************************************
Exp. 52 on orbit
Randy Bresnik
Paolo Nespoli IZ?JPA
Sergey Ryazanskiy
****************************************************************************
73,
Charlie Sufana AJ9N
One of the ARISS operation team mentors
------------------------------
Message: 7
Date: Fri, 8 Sep 2017 16:23:09 -0400
From: Norm n3ykf <normanlizeth@xxxxx.xxx>
To: Bob- W7LRD <w7lrd@xxxxxxx.xxx>
Cc: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] elev rotor
Message-ID:
<CAJUhCTNE5VAB6tgp9KbQWG151KTD=th0prEv8zH9XXmRLF+AGg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset="UTF-8"
What type of controller are you using (I.E LVB tracker or the like)?
Does the controller report the correct az/el information?
Can you talk to the controller? Or at least monitor the serial port to
see if it's transmitting data?
Check the terminals on the back of the control box (az and el) 1,2,3
for +5, wiper arm (0-4.5 VDC wrt pin 3) and +5 return, respectively.
You are in a maze of twisty passages all alike.
Norm n3ykf
On Fri, Sep 8, 2017 at 3:14 PM, Bob- W7LRD <w7lrd@xxxxxxx.xxx> wrote:
> hello
>
> my g5500 works only manually az & el
> no meter indication on elev
> no computer control using Satpc32
> ideas?
> 73 Bob W7LRD
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
expressed
> are solely those of the author, and do not reflect the official views of
AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 8
Date: Sat, 9 Sep 2017 12:16:25 +0100
From: David Johnson <dave@xxxxx.xx.xx>
To: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] elev rotor
Message-ID: <6BABF243-8B59-47E8-B5FA-7D75314BAEB3@xxxxx.xx.xx>
Content-Type: text/plain; charset=us-ascii
Possible that the centre wiper on the feedback pot has gone open circuit.
Fairly common failure mode.
Dave, G4DPZ
Sent from my iPhone
> On 8 Sep 2017, at 21:10, John Brier <johnbrier@xxxxx.xxx> wrote:
>
> Bob,
>
> I have never used this equipment, but have you tried resetting things
> like physical connections or done a computer reboot?
>
> Are you using the AMSAT LVB Tracker? Does it seem to be working?
>
> More information will help others help you.
>
> 73, John Brier KG4AKV
>
>
>> On Fri, Sep 8, 2017 at 3:14 PM, Bob- W7LRD <w7lrd@xxxxxxx.xxx> wrote:
>> hello
>>
>> my g5500 works only manually az & el
>> no meter indication on elev
>> no computer control using Satpc32
>> ideas?
>> 73 Bob W7LRD
>>
>> _______________________________________________
>> Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
>> to all interested persons worldwide without requiring membership.
Opinions expressed
>> are solely those of the author, and do not reflect the official views of
AMSAT-NA.
>> Not an AMSAT-NA member? Join now to support the amateur satellite program!
>> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
expressed
> are solely those of the author, and do not reflect the official views of
AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 9
Date: Sat, 9 Sep 2017 21:56:27 +0000 (UTC)
From: Bob- W7LRD <w7lrd@xxxxxxx.xxx>
To: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] g5500 pot
Message-ID:
<1801105060.1115198.1504994187673.JavaMail.zimbra@xxxxxxx.xxx>
Content-Type: text/plain; charset=utf-8
where is the best place to buy the sending pot for a G5500 elevation rotor.
Or does someone have one laying around?
73 Bob W7LRD
------------------------------
Message: 10
Date: Sat, 9 Sep 2017 18:08:35 -0500
From: "Mac A. Cody" <maccody@xxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Making the linear satellites more accessible
Message-ID: <e7c183c2-d3db-1436-4dfb-e1211eba3b6c@xxx.xxx>
Content-Type: text/plain; charset=utf-8; format=flowed
First, thanks to those that replied to my question about the level of
activity on the linear transponder satellites. What was saidwaspretty
much what I suspected. I was just looking for some verification from
others before expressing some thoughts about making the linear satellites
more accessible to amateur radio operators. I apologize up front for
this lengthy posting. Please accept it in the spirit of experimentation,
reducing the level of congestion on a few satellites, and possibly
increasing the ranks of the amateur satellite community. I'm sure that
there will be those ready to step forward and correct me on any of the
assumptions or statements that I make. Please be understanding.
There are currently two FM repeater satellites (three, counting the
sporadicly active LilacSat2). SO-50 and AO-85 are heavily used, with
frequent congestion. Meanwhile, there are a dozen linear transponder
satellites that are relatively lightly used with bandwidth for multiple
simultaneous channels. I understand that it makes sense to launch linear
transponders, rather than FM repeaters, due to the better utilization of
resources.
In my estimation, the relative lack of utilization of the linear birds,
compared to the FM birds, is the cost barrier for the radio equipment
required to be able to work them. The added challenges of finding other
stations in the band and stricter Doppler accommodation also exist, but
can be mastered with practice. Allow me, though, to confine my comparison
to voice-mode communication only, for reasons I'll explain shortly.
A pair of inexpensive hand-held FM transceivers and a pair of Yagi antennas
(or an Arrow or Elk antenna) are all that is needed to successfully work the
FM birds. In fact, that is what I'm using right now. An expenditure of
about $200 is needed, possibly less. On the other hand, to properly work
the linear birds using voice requires an SSB transceiver (if capable of
full duplex operation), or that and another SSB receiver, otherwise. The
attendant expense appears to approach $1000, possibly more.
One suggestion is to work the linear satellites using CW mode. While this
could definitely be less expensive, it exchanges one barrier for two others.
The first is the need to know Morse code. The second is the apparent
lack of
regard that many in the satellite operator community appear to exhibit
for CW
operations on the satellites. The cause appears to be a lack of discipline
by some CW operators in both power management (signals hogging the
transponder
power or 'flipping the bird') and signal frequency management (failing to
properly compensate for Doppler shift, thereby encroaching on other QSOs).
Both of these discipline problems occur at the expense of the SSB operators
resulting a lot of public ire towards CW ops - Ironically, I also hear that
such discipline problems also occur with some SSB ops, too. Consequently, I
don't see CW ops as a particularly viable solution to lowering the barrier
to using the linear birds.
I also don't see allowing other digital modes on the linear birds to be a
viable solution either. Most digital modes are propagated via SSB
transceivers.
This raises the cost bar once again, which doesn't solve the problem. There
are a few digital modes, such as Hellschreiber, that don't ride on SSB, but
they are not popular and would exclude QSOs with voice-mode operators. The
closest may be the successful use of OpenDV and an appropriate digital
modulation scheme. That is all still very experimental.
What I propose, then, is the use of well-disciplined DSB (double sideband)
modulation as a means of lowering the cost bar while providing
interoperability
with SSB voice stations that are working the satellites. What I mean by
'well-disciplined' DSB is as follows:
1) Baseband audio bandwidth sharply limited to 2.5 KHz, resulting in RF
bandwidth or 5 KHz. This would realistically enable three to fifteen
simultaneous 'channels' depending upon the linear bird being used.
2) Power output would be limited to just a couple of Watts. This is all
that
is really necessary to access the linear birds in most situations. It
would reduce the possibility of signal interference. The cost of the PA
would be relatively low.
3) The RF oscillator would be accurate and computer controlled (e.g. Silicon
Labs Si570), which would enable active Doppler compensation via software
with
CAT control (e.g. gpredict).
Current SDR technologies already enable inexpensive, multi-band receiver
solutions. The desired sensitivity and selectivity of the SDR receiver
ultimately drives the receiver cost. The performance of the receiver, then
depends upon the budget of the station builder. Solutions for every
budget are now available, ranging from dirt cheap hardware derived from
RTL-SDR dongles to more capable devices (e.g. SDRplay, AirSpy, FunCube
Dongle).
At the sacrifice of some bandwidth, the following advantages can be had with
using DSB modulation:
1) DSB modulation is relatively easy to achieve. The band-limited audio
is fed into a double-balanced mixer, bandpass filtered for harmonics, and
fed into a PA for transmission. The resulting hardware is comparatively
inexpensive to construct and to tune.
2) Sideband inversion caused by some linear birds is no longer an issue.
Having both sidebands present in DSB modulation means that the correct
sideband will always be available for reception.
3) Interoperability with SSB stations would be maintained, as DSB modulation
is a superset of SSB modulation.
Thanks again, for reading this long posting. I'm sure that there will be
those that will consider my suggestions to ill-advised, or even outright
heresy!
73,
Mac Cody / AE5PH
------------------------------
Message: 11
Date: Sat, 9 Sep 2017 18:58:25 -0500
From: John Geiger <af5cc2@xxxxx.xxx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Kenwood TS2000X HF/VHF/UHF/1.2ghz satellite radio
for sale
Message-ID:
<CAHC1P28rwCR_UfuSm-Lj1Uy2MTSH0r2aQM2UA8cHTt4aCTUmww@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset="UTF-8"
I have for sale a Kenwood TS2000X, which does 100 watts on HF/6/m/2m, 50
watts on 70cm and 10 watts on 1.2ghz. It has a built in antenna tuner,
memory keyer, TCXO, AM/FM subreceiver, and does full duplex for the
satellites. It has 10 dedicated satellite memories, and will do normal and
reverse tracking.
You can add a voice keyer chip to it which makes it a very versatile all
band radio for satellite work, HF contesting, and VHF contesting. It has
IF-DSP for noise reduction and narrow filters.
It is a 2012 model and in very good condition. I have done very limited
testing on 1.2ghz with it as I don't have any test equipment for that band,
but if it doesn't work right there I will refund your money. It comes with
the power cord, hand mic, and manual. I am asking $1050 shipped. I would
consider trading it for a TS2000 (without 1.2ghz) and cash.
I can take paypal/cash/MO/check.
73 John AF5CC
------------------------------
Message: 12
Date: Sat, 9 Sep 2017 21:28:05 -0400
From: Ken Alexander <k.alexander@xxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] SatPC Error Message when updating Keps
Message-ID: <c0c02da8-e282-6615-053e-f621e0360014@xxxxxx.xxx>
Content-Type: text/plain; charset=utf-8; format=flowed
I went to update the Keplerian files this evening and get the following
error message after successfully downloading the keps. The error pops up
when I click on the Quit button. SatPC is locked up solid. There's no
way out except by rebooting.
Any help would be gratefully received.
Thanks and 73,
Ken
VE3HLS
------------------------------
Subject: Digest Footer
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------------------------------
End of AMSAT-BB Digest, Vol 12, Issue 225
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