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CX2SA > SATDIG 28.02.17 15:42l 815 Lines 29223 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.SAL.URY.SOAM
To : SATDIG@WW
Today's Topics:
1. Upcoming ARISS contact with Student Space Technology
Association, Knoxville, TN (n4csitwo@xxxxxxxxx.xxxx
2. Re: BY70-1 (Howie DeFelice)
3. ARISS packet (Richard Lawn)
4. UT1FG/MM Update (John Papay)
5. Upcoming ARISS Contact Schedule as of 2017-02-28 07:30 UTC
(AJ9N@xxx.xxxx
6. Baofeng Bf-f8 (Phil)
7. Re: ARISS packet (Alan)
8. TS-2000 Strange behavior (Mike Thompson)
9. Re: Baofeng Bf-f8 (Roy Dean)
10. Re: Baofeng Bf-f8 (Paul Stoetzer)
----------------------------------------------------------------------
Message: 1
Date: Sun, 26 Feb 2017 21:59:06 -0500
From: <n4csitwo@xxxxxxxxx.xxx>
To: <ariss-press@xxxxx.xxx>, "amsat-edu" <amsat-edu@xxxxx.xxx>,
<amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Upcoming ARISS contact with Student Space
Technology Association, Knoxville, TN
Message-ID: <E3CA52EC23E141D6AC08A962BA8B5758@xxx>
Content-Type: text/plain; charset="iso-8859-1"
An International Space Station school contact has been planned with
participants at Student Space Technology Association, Knoxville, TN on 01
Mar. The event is scheduled to begin at approximately 19:08 UTC. The
duration of the contact is approximately 9 minutes and 30 seconds. The
contact will be direct between NA1SS and AA4UT. The contact should be
audible over the middle and eastern U.S and adjacent areas. Interested
parties are invited to listen in on the 145.80 MHz downlink. The contact is
expected to be conducted in English.
The University of Tennessee Knoxville is an amazing school located in the
hills of Tennessee. It is the largest campus in the state, hosting more than
30,000 students. This school is known for its engineering and science
heritage, having close ties with research facilities such as Oak Ridge
National Lab and companies like Alcoa. Also, included in our alumni are 9
astronauts including the recent ISS inhabitant Scott Kelly. Our school is
filled with thousands of eager students seeking to pursue careers in the
space industry. With our vision of becoming a top-tier research school, our
students are set to become the next leaders in STEM industries.
Participants will ask as many of the following questions as time allows:
1. Is it difficult to remain up to date on recent events on Earth?
2. Have there been any recent advancements made in ISS biological research
that could be applied on Earth?
3. How do you feel about riding on a commercial spacecraft like SpaceX's
Dragon Capsule as opposed to a government agency's craft?
4. When doing research, or any other investigation, what kind of cleaning
processes do you use on your equipment, or even yourself, to avoid
contamination of material and equipment?
5. Has there been any research that has been done with the possible
application of zero g therapy to joint diseases such as arthritis.
6. Having used current NASA spacesuits, are you excited about the new space
clothing developments being made like the Skinsuit?
7. Why does the vegetable growth experiment chamber have a pink-looking light
rather than a white light?
8. Are there any items/tools that are "lost" inside ISS?
9. Can you tell us about the recent software updates to the ISS computers?
10. Are there any experiments related to additive manufacturing going on at
the moment?
11. Using the Haptics-2, how close do you think the technology is to
application on Mars? What kind of applications could you see the
technology being used for? Anything memorable from the experiment?
12. How often, and how, do you launch satellites from the ISS?
13. Are there plans to test means of producing artificial gravity in the near
future?
14. Can you talk about the inflatable module that was delivered to the ISS in
April of 2016?
15. Would there be any foreseeable benefits in performing complex medical
operations (such as open heart surgery) in a zero g environment.
PLEASE CHECK THE FOLLOWING FOR MORE INFORMATION ON ARISS UPDATES:
Visit ARISS on Facebook. We can be found at Amateur Radio on the
International Space Station (ARISS).
To receive our Twitter updates, follow @xxxxxxxxxxxx
Next planned event(s):
TBD
About ARISS:
Amateur Radio on the International Space Station (ARISS) is a cooperative
venture of international amateur radio societies and the space agencies that
support the International Space Station (ISS). In the United States,
sponsors are the Radio Amateur Satellite Corporation (AMSAT), the American
Radio Relay League (ARRL), the Center for the Advancement of Science in
Space (CASIS) and National Aeronautics and Space Administration (NASA).
The primary goal of ARISS is to promote exploration of science, technology,
engineering, and mathematics (STEM) topics by organizing scheduled contacts
via amateur radio between crew members aboard the ISS and students in
classrooms or informal education venues. With the help of experienced
amateur radio volunteers, ISS crews speak directly with large audiences in a
variety of public forums. Before and during these radio contacts, students,
teachers, parents, and communities learn about space, space technologies,
and amateur radio. For more
information, see www.ariss.org, www.amsat.org, and www.arrl.org.
Thank you & 73,
David - AA4KN
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------------------------------
Message: 2
Date: Mon, 27 Feb 2017 18:37:56 +0000
From: Howie DeFelice <howied231@xxxxxxx.xxx>
To: Phil Karn <karn@xxxx.xxx>, "amsat-bb@xxxxx.xxxx
<amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] BY70-1
Message-ID:
<BN6PR17MB0977F24D9039F3B2AC1D8AEBE7570@xxxxxxxxxxxxx.xxxxxxxx.xxxx.xxxxxxx.xx
x>
Content-Type: text/plain; charset="iso-8859-1"
Thanks Phil, that explanation cleared up many questions. I had been thinking
about ways to use the earths magnetic field to raise perigee by storing
energy in capacitors and pulsing something along the lines of a magnetorquer
with a high current pulse at the right time and vector. The problem, I
think, is that I would need to generate the thrust at apogee where the
earths magnetic field is weakest.
- Howie AB2S
________________________________
From: Phil Karn <karn@xxxx.xxx>
Sent: Saturday, February 25, 2017 12:41 AM
To: Howie DeFelice; amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] BY70-1
On 2/24/17 07:55, Howie DeFelice wrote:
> Very interesting Phil, it seems to make sense that this calculation
> could be used in reverse to calculate the energy needed raise the
> perigee height of a GTO orbit. Assuming a flight to GTO was available to
> a 1U or 3U cubesat, if the perigee is not raised the satellite will not
> stay in orbit very long, if I understand it correctly. Given the limited
> size of the spacecraft and the prohibition on volatile propellants this
> poses a difficult challenge. It would be interesting to determine if
> enough thrust can be generated by electrical thrusters to accomplish this ?
>
>
> - Howie AB2S
It would be most relevant if you can use a tether to form an electric
motor with the earth's magnetic field to raise your orbit.
Otherwise, things are much more complicated with a chemical or
electrical rocket because you have to carry your reaction mass with you
and then put energy into it to blow it out the nozzle at high speed.
There's a fundamental tradeoff in rocketry between rocket power and
propellant mass flow rate. You can produce a given amount of thrust with
high power and a low propellant mass flow rate, or with low power and a
high propellant mass flow rate.
E.g., to produce a thrust of 1 N with a mass flow rate of 1 kg/s, you
have to eject it at 1 N / 1 kg/s = 1 meter/sec. Ignoring relativity, the
kinetic energy in 1 second of exhaust (1 kg) will therefore be
1/2 mv^2 = 1/2 * 1 kg * (1 m/s)^2 = 0.5 joules
and since you need 0.5 joules every second, the required power will be
0.5 watts (assuming 100% efficiency).
If you double the exhaust velocity to 2 m/s, you can drop the mass flow
rate to only 1/2 kg/s and still get 1 N of thrust (1/2 kg/s * 2 m/s = 1
N). But you'll now need a power of
0.5 * 0.5 kg/s * (2 m/s)^2 = 1 watt
i.e., twice as much power for that same 1 newton of thrust.
So, which do you have more of, propellant mass or energy? In a chemical
rocket the energy is stored in the unburned propellant, so the energy
per unit mass is set by the propellant chemistry. That's why every
propellant combination has a theoretical specific impulse, e.g. 455
seconds for hydrogen/oxygen in vacuum. Specific impulse is just
effective exhaust velocity divided by g = 9.8 m/s^2, so the theoretical
exhaust velocity for hydrogen/oxygen is 4,462 m/s.
But in an electric rocket the energy source is external to the
propellant mass, so the energy/mass ratio can vary; you decide how fast
to eject it. If mass is cheaper than energy, then you want a low exhaust
velocity. If energy is cheaper than mass, then you want a high exhaust
velocity.
Since the rocket is free to move, the kinetic energy it produces will be
split between the payload/rocket itself (which you want) and the exhaust
(which is effectively wasted). The only way to get 100% of the energy
into the payload/rocket and none into the exhaust is to set the exhaust
velocity equal to the current velocity of the rocket so that the exhaust
comes out stationary. Of course, velocity is relative so you measure it
relative to the reference frame in which the rocket is initially
stationary. So to minimize energy consumption you want to increase the
exhaust velocity as the rocket accelerates. That's the exact idea behind
the VASIMR (Variable Specific Impulse Magnetoplasma Rocket).
The recent "EM drive" hype notwithstanding, I know of only one way to
produce thrust in vacuum without some kind of propellant: the photon
rocket. Even a flashlight will work, but let's do the numbers. The
momentum of a photon is equal to its energy divided by the speed of
light, so to get 1 newton of thrust from a 100% efficient photon rocket
requires a power input of 1 N * c = 300 megawatts!
That kind of power in space requires either a very large solar array or
a very big nuclear reactor (which still needs a very large radiator to
reject waste heat).
But there's a simpler way to power a photon rocket with the sun. Instead
of turning solar photons into electricity and back into photons, why not
use solar photons directly? Voila -- that's what a solar sail does. The
thrust produced by a solar sail per unit area is equal to the incident
solar power per unit area divided by the speed of light. At 1 AU that's
about 1361 W/m^2, so the thrust will be 1361 W/m^2 / c = 4.54 micro
newton/m^2. That's actually units of pressure, so solar radiation
pressure at 1 AU is 4.54 micropascal on a sail normal to the sun that
simply absorbs solar photons. If you reflect them back, you'll get twice
as much, 9.08 micropascal. Doesn't seem like much, but you'll get it
continuously, no local power source or propellant mass needed.
The one big problem with solar sails is that you can't use them in low
orbits because they'll generate far more drag than thrust.
73, Phil
------------------------------
Message: 3
Date: Tue, 28 Feb 2017 01:19:24 +0000
From: Richard Lawn <rjlawn@xxxxx.xxx>
To: Amsat BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] ARISS packet
Message-ID:
<CADQmrTHy6rq+uYV3bv4Gi4uw+RsysY1UmkeNSJ=C5b1hLWwKjg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
I read JoAnne's article in the recent AMSAT journal issue with great
interest as it was somethingnive never done. I set up UISS with SoundModem
to work with my Flex5000A. I have no decoding packets whatsoever either
from ARISS or terrestrial on 144.390. But I've not gotten any feedback to
suggest I'm being heard. I've tried 144.390 but do not see my location
coming up on any APRS map. Any idea what I'm doing wrong? I can verify that
I am transmitting a packet signal. I used packet for a short time years ago
with a hardware TNC but quickly lost interest and never got into APRS.
advice would be appreciated.
73
Rick, W2JAZ
--
Sent from Gmail Mobile
------------------------------
Message: 4
Date: Mon, 27 Feb 2017 23:31:40 -0500
From: John Papay <john@xxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] UT1FG/MM Update
Message-ID: <20170228050236.17B518A7B@xxxxxxxxxx.xxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
Yuri, UT1FG/MM, is at Anchorage now, cleaning
the hold in preparation for a cargo of sugar.
He will go back into Coatzacoalcos Mexico for
loading. After that he will proceed to Montreal
Canada.
Yuri does not anticipate mailing confirmations
until he arrives in Montreal. That could change
depending on delays. All confirmation requests
have been sent to him. If you send more, do not
duplicate what you have already sent. Send only
new contacts. He will mail all of your logsheets
together. I will always email a confirmation back to
you when I receive your logsheet. Please email me if
you don't hear from me.
73,
John K8YSE/7
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------------------------------
Message: 5
Date: Tue, 28 Feb 2017 03:33:22 -0500
From: AJ9N@xxx.xxx
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Upcoming ARISS Contact Schedule as of 2017-02-28
07:30 UTC
Message-ID: <b5800d.740dd03b.45e68fd1@xxx.xxx>
Content-Type: text/plain; charset="UTF-8"
Upcoming ARISS Contact Schedule as of 2017-02-28 07:30 UTC
Quick list of scheduled contacts and events:
ABOUT GAGARIN FROM SPACE, Space Odyssey Project, Krasnoyarsk, Russia,
direct via RV?ADW
The ISS callsign is presently scheduled to be RS?ISS
The scheduled astronaut is Andrei Borisenko
Contact is a go for Sat 2017-02-25 08:36 UTC
Ecole primaire Elie Desplan, Boissi?res, France and Marie Castang, Saint
Dionisy, France, direct via F4HHV
The ISS callsign is presently scheduled to be FX?ISS
The scheduled astronaut is Thomas Pesquet KG5FYG
Contact was successful: Sat 2017-02-25 13:14:15 UTC 58 deg (***)
ABOUT GAGARIN FROM SPACE, Raduga Space Communication Center of St.
Petersburg, Russia, direct via RA1AJN
The ISS callsign is presently scheduled to be RS?ISS
The scheduled astronaut is Sergey Ryzhikov
Contact wss successful: Sun 2017-02-26 09:15 UTC (***)
Ecole Albert Camus, Rueil-Malmaison, France, College Marcel Pagnol,
Rueil-Malmaison, France, and Ecole ?Robespierre B.?, Rueil-Malmaison, France,
direct via F6KFA
The ISS callsign is presently scheduled to be FX?ISS
The scheduled astronaut is Thomas Pesquet KG5FYG
Contact is a go for: Wed 2017-03-01 08:04:44 UTC 77 deg
Student Space Technology Association, Knoxville, TN, direct via AA4UT
The ISS callsign is presently scheduled to be NA1SS
The scheduled astronaut is Shane Kimbrough KE5HOD
Contact is a go for: Wed 2017-03-01 19:08:03 UTC 49 deg
Blair Pointe Upper Elementary School, Peru, IN, direct via WD9GIU
The ISS callsign is presently scheduled to be NA1SS
The scheduled astronaut is Shane Kimbrough KE5HOD (***)
Contact is a go for: Thu 2017-03-09 15:21:33 UTC 80 deg (***)
3rd Junior High School, Komotini, Greece, direct via SV7APQ
The ISS callsign is presently scheduled to be OR4ISS
The scheduled astronaut is Shane Kimbrough KE5HOD
Contact is a go for: Fri 2017-03-10 08:20:46 UTC 28 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.
****************************************************************************
***
Message to US Educators
Amateur Radio on the International Space Station
Contact Opportunity
Call for Proposals
Proposal Window February 15 ? April 15, 2017
The Amateur Radio on the International Space Station (ARISS) Program is
seeking formal and informal education institutions and organizations,
individually or working together, to host an Amateur Radio contact with a
crew
member on board the ISS. ARISS anticipates that the contact would be held
between January 1, 2018 and June 30, 2018. Crew scheduling and ISS orbits
will
determine the exact contact dates. To maximize these radio contact
opportunities, ARISS is looking for organizations that will draw large
numbers of
participants and integrate the contact into a well-developed education
plan.
The deadline to submit a proposal is April 15, 2017. Proposal information
and documents can be found at www.arrl.org/hosting-an-ariss-contact.
The Opportunity
Crew members aboard the International Space Station will participate in
scheduled Amateur Radio contacts. These radio contacts are approximately 10
minutes in length and allow students to interact with the astronauts through
a question-and-answer session.
An ARISS contact is a voice-only communication opportunity via Amateur
Radio between astronauts and cosmonauts aboard the space station and
classrooms and communities. ARISS contacts afford education audiences the
opportunity to learn firsthand from astronauts what it is like to live and
work in
space and to learn about space research conducted on the ISS. Students also
will have an opportunity to learn about satellite communication, wireless
technology, and radio science. Because of the nature of human spaceflight and
the complexity of scheduling activities aboard the ISS, organizations must
demonstrate flexibility to accommodate changes in dates and times of the
radio contact.
Amateur Radio organizations around the world, NASA, and space agencies in
Russia, Canada, Japan and Europe sponsor this educational opportunity by
providing the equipment and operational support to enable direct
communication between crew on the ISS and students around the world via
Amateur Radio.
In the US, the program is managed by AMSAT (Radio Amateur Satellite
Corporation) and ARRL (American Radio Relay League) in partnership with
NASA and
CASIS (Center for the Advancement of Science in Space).
More Information
Interested parties can find more information about the program at
www.ariss.org and www.arrl.org/ARISS.
For proposal information and more details such as expectations, proposal
guidelines and proposal form, and dates and times of Information Sessions go
to http://www.arrl.org/hosting-an-ariss-contact.
Please direct any questions to ariss@xxxx.xxx.
****************************************************************************
***
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 123
Gaston ON4WF with 123
Francesco IK?WGF with 119
****************************************************************************
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 2017-02-28 07:30 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 1119. (***)
Each school counts as 1 event.
Total number of ARISS ISS to earth school contacts is 1082. (***)
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 2017-02-28 07:30 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. 49 on orbit
Shane Kimbrough KE5HOD
Andrei Borisenko
Sergey Ryzhikov
Exp. 50 on orbit
Peggy Whitson
Thomas Pesquet KG5FYG
Oleg Novitskiy
****************************************************************************
73,
Charlie Sufana AJ9N
One of the ARISS operation team mentors
------------------------------
Message: 6
Date: Tue, 28 Feb 2017 18:44:45 +1000
From: Phil <phil_lor@xxxxxxx.xxx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Baofeng Bf-f8
Message-ID: <2ee1091a-7d4a-7513-1c61-acf0bcd9deca@xxxxxxx.xxx>
Content-Type: text/plain; charset=utf-8; format=flowed
I wonder if anyone has any experience with the Baofeng BF-F8? Has the
overloading of the receiver been overcome compared to the earlier UV-5R
model?
--
Regards,
Phil
------------------------------
Message: 7
Date: Tue, 28 Feb 2017 06:06:14 -0600
From: "Alan" <wa4sca@xxxxx.xxx>
To: "'Amsat BB'" <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] ARISS packet
Message-ID: <000201d291bb$0f243a30$2d6cae90$@xxxxx.xxx>
Decoding is usually the easiest, and Soundmodem is very tolerant of signal
levels. You could try changing the sampling rates. I and others have found
in the past there are rates which for unexplained reasons don't work on one
machine, but do on others.
73s,
Alan
WA4SCA
<-----Original Message-----
<From: AMSAT-BB [mailto:amsat-bb-bounces@xxxxx.xxxx On Behalf Of
<Richard Lawn
<Sent: Monday, February 27, 2017 19:19 PM
<To: Amsat BB <amsat-bb@xxxxx.xxx>
<Subject: [amsat-bb] ARISS packet
<
<I read JoAnne's article in the recent AMSAT journal issue with great
<interest as it was somethingnive never done. I set up UISS with SoundModem
<to work with my Flex5000A. I have no decoding packets whatsoever either
<from ARISS or terrestrial on 144.390. But I've not gotten any feedback to
<suggest I'm being heard. I've tried 144.390 but do not see my location
<coming up on any APRS map. Any idea what I'm doing wrong? I can verify that
<I am transmitting a packet signal. I used packet for a short time years ago
<with a hardware TNC but quickly lost interest and never got into APRS.
<advice would be appreciated.
<
<73
<Rick, W2JAZ
<--
<Sent from Gmail Mobile
<_______________________________________________
<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: Mon, 27 Feb 2017 09:04:06 -0600
From: Mike Thompson <zryder94@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] TS-2000 Strange behavior
Message-ID:
<CAGD5MUGhSiipzBhPZDqmN6EaqqmYUq=5OQgxksatB8fpEj7Dpw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Good morning Gent's.
Thank you everyone for the help this past weekend getting me back on the
birds. One step at a time. Eggbeater's are in process, and with any luck,
that will do the trick for now.
I come to you guys with a little bit of an unexplained situation I am
having with my TS-2000. For whatever reason, it seems to be showing full
scale RF input, but it doesn't seem to hear anything.
The current antenna is a Comet GP-15 Tri-band vertical on my roof. It's
common coax is connected to the common port of a Comet CFX-514 Tri-plexer.
I had this triplexer on a VNA at work for giggles, and I found it to have
about 50dB of isolation between the port's. Does this seem like I am
overloading the front end of the 2m side with the 70cm transmit through the
triplexer?
https://youtu.be/eV_HGuw60_4
Thank you for your help and suggestions.
------------------------------
Message: 9
Date: Tue, 28 Feb 2017 07:48:07 -0500
From: Roy Dean <royldean@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Baofeng Bf-f8
Message-ID:
<CADGPg2txXnFW2fNiuwOjnVxN=O8xy-0atpSgMUQ5E1mKj_KeFA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Phil,
I started out last year using a BF-F8HP and UV-5R for full duplex
operation, and sadly experienced desense every single time. Tried the BF
as both Tx and Rx radio, desense occured in both. Even stuck band pass
filters in the Rx radio feedline... no go.
--Roy
------------------------------
Message: 10
Date: Tue, 28 Feb 2017 08:34:56 -0500
From: Paul Stoetzer <n8hm@xxxx.xxx>
To: Roy Dean <royldean@xxxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Baofeng Bf-f8
Message-ID:
<CABzOSOoESOAW5cXW3ome6VgpJkMNHb7RKoOvLBLRt2ygo76P5Q@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Since a bandpass filter on the receiver did not correct the problem,
the issue is likely the third harmonic from the transmitted signal. A
receive bandpass filter will naturally pass that third harmonic. What
you need is a low pass filter on the transmit radio. Any commercially
available diplexer will perform this function.
73,
Paul, N8HM
On Tue, Feb 28, 2017 at 7:48 AM, Roy Dean <royldean@xxxxx.xxx> wrote:
> Phil,
>
> I started out last year using a BF-F8HP and UV-5R for full duplex
> operation, and sadly experienced desense every single time. Tried the BF
> as both Tx and Rx radio, desense occured in both. Even stuck band pass
> filters in the Rx radio feedline... no go.
>
> --Roy
> _______________________________________________
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------------------------------
Subject: Digest Footer
_______________________________________________
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 member? Join now to support the amateur satellite program!
http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
End of AMSAT-BB Digest, Vol 12, Issue 55
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