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CX2SA > SATDIG 03.08.18 15:31l 831 Lines 27418 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. Upcoming ARISS Contact Schedule as of 2018-08-02 05:30 UTC
(aj9n@???.????
2. BIRDS-2 deploy from ISS on 10th Aug (Masahiro Arai)
3. FT-991A Transmit Interference (VA3ASE)
4. Re: FT-991A Transmit Interference (Paul Stoetzer)
5. Re: FT-991A Transmit Interference (Zach Metzinger)
6. Birds-2 satellite (alex weimer)
7. Re: FT-991A Transmit Interference (TERRY SURFACE)
8. Re: FT-991A Transmit Interference (Paul Stoetzer)
9. Re: FT-991A Transmit Interference (Alan)
10. Re: FT-991A Transmit Interference (M5AKA)
11. Re: FT-991A Transmit Interference (Mike Sprenger)
----------------------------------------------------------------------
Message: 1
Date: Thu, 2 Aug 2018 01:49:00 -0400
From: aj9n@???.???
To: amsat-bb@?????.???
Subject: [amsat-bb] Upcoming ARISS Contact Schedule as of 2018-08-02
05:30 UTC
Message-ID: <164f92ea175-c8b-20119@?????????????.???.???????.???>
Content-Type: text/plain; charset=utf-8
Upcoming ARISS Contact Schedule as of 2018-08-02 05:30 UTC
Quick list of scheduled contacts and events:
17th Nippon Scout Jamboree, Suzu City, Ishikawa, Japan, via 8N9SJ
The ISS callsign is presently scheduled to be NA1SS
The scheduled astronaut is Ricky Arnold KE5DAU
Contact cancelled due to on orbit operations (***)
?
******************************************************************************
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@?????.??? or aj9n@???.???.
?
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@?????????.???
****************************************************************************
ARISS congratulations the following mentors who have now mentored over 100
schools:?
Francesco IK?WGF with 132
Satoshi 7M3TJZ with 130
Gaston ON4WF with 123
Sergey RV3DR with 106
****************************************************************************
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?2018-08-02 05:30 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 1242.
Each school counts as 1?event.
Total number of ARISS ISS to earth school contacts is 1190.
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:
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 2018-07-27 02:00 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. 55 on orbit
Drew Feustel
Oleg Artemyev
Ricky Arnold KE5DAU
?
Exp. 56 on orbit
Serena Aunon-Chancellor KG5TMT
Alexander Gerst KF5ONO
Sergei Propopev
****************************************************************************
73,
Charlie?Sufana AJ9N
One of the ARISS operation team mentors
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
------------------------------
Message: 2
Date: Fri, 3 Aug 2018 01:06:48 +0900
From: Masahiro Arai <m-arai@?.?????.??.??>
To: amsat-bb@?????.???
Subject: [amsat-bb] BIRDS-2 deploy from ISS on 10th Aug
Message-ID: <ee8f8c38-aa95-8084-c63e-931cf62e2103@?.?????.??.??>
Content-Type: text/plain; charset=utf-8; format=flowed
JAXA announced BIRDS-2 three CubeSats BHUTAN-1, MAYA-1 and UiTMSat-1
deploy from ISS at 10th August.
They will transmit 30 minutes after deployment. Initial mode looks CW
on 70cm. They use same frequency 437.375MHz and transmit in the order
of BHUTAN-1, MAYA-1 and UiTMSat-1.
BIRDS-2 CubeSats has also APRS digipeater on 145.825MHz.
Satellite Country ID Call Sign
BHUTAN-1 Bhutan BIRD-BT JG6YKL
MAYA-1 Philippines BIRD-PH JG6YKM
UiTMSat-1 Malaysia BIRD-MY JG6YKN
http://birds2.birds-project.com/operation/
Happy chaseing!
JN1GKZ Masa Tokyo Japan
------------------------------
Message: 3
Date: Thu, 2 Aug 2018 14:35:54 -0400
From: VA3ASE <va3ase@?????.???>
To: amsat-bb@?????.???
Subject: [amsat-bb] FT-991A Transmit Interference
Message-ID:
<CACgQwJ-On-0tD5b_FVv360Eg_wAAYTiR+LmDag2i4F3qkMh=7g@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Hi AMSAT friends,
I'm having a technical problem and was wondering if anyone had any
suggestions. I've been experimenting with using an FT-991A transmitter and
SDR receiver to run full-duplex on the satellites. My problem is as soon as
I key the FT-991A transmitter, my SDR receiver waterfall goes completely
white and I don't hear anything but static. Classic overload symptoms.
I've tried several things:
- Upgrading my receiver from an RTL-SDR to an SDRplay RSP1A: no improvement.
- Adding a duplexer as a band pass filter: no improvement.
- Transmitting with a vertical antenna about 40' away from my yagis: YES it
did solve the problem but is not a suitable solution.
I'm using the same yagi antenna setup that I've used successfully for years
with an FT-847, and have also had the same problem with a handheld Arrow.
At last I tried transmitting with a different radio, and the problem
disappears. I figured the problem was in my FT-991A so I sent it for
warranty repair, but just got the call that they can't find anything wrong
with it. It has no measurable spurious or out of band emissions. I'm at a
loss here... I know people are using the same equipment (FT-991 + SDRplay)
successfully; Simon Brown comes to mind.
Here is a video I created demonstrating the problem with the FT-991 and
showing that it doesn't appear with an Icom ID-880H.
https://youtu.be/gXOIK5gLjgs
I still think the problem must be in the radio, but if they can't find
anything to fix then I'm out of luck. I'd love to hear any suggestions or
feedback.
Thanks,
Alex VA3ASE
------------------------------
Message: 4
Date: Thu, 2 Aug 2018 14:39:44 -0400
From: Paul Stoetzer <n8hm@????.???>
To: VA3ASE <va3ase@?????.???>
Cc: AMSAT BB <amsat-bb@?????.???>
Subject: Re: [amsat-bb] FT-991A Transmit Interference
Message-ID:
<CABzOSOrgbjEGbDhFTiVrG_BBXHWAPtuS4Bw=ZEWCK40jaT_ExQ@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Did you try a duplexer on both the input and output side?
73.
Paul, N8HM
On Thu, Aug 2, 2018 at 2:35 PM, VA3ASE <va3ase@?????.???> wrote:
> Hi AMSAT friends,
>
> I'm having a technical problem and was wondering if anyone had any
> suggestions. I've been experimenting with using an FT-991A transmitter and
> SDR receiver to run full-duplex on the satellites. My problem is as soon as
> I key the FT-991A transmitter, my SDR receiver waterfall goes completely
> white and I don't hear anything but static. Classic overload symptoms.
>
> I've tried several things:
> - Upgrading my receiver from an RTL-SDR to an SDRplay RSP1A: no improvement.
> - Adding a duplexer as a band pass filter: no improvement.
> - Transmitting with a vertical antenna about 40' away from my yagis: YES it
> did solve the problem but is not a suitable solution.
>
> I'm using the same yagi antenna setup that I've used successfully for years
> with an FT-847, and have also had the same problem with a handheld Arrow.
>
> At last I tried transmitting with a different radio, and the problem
> disappears. I figured the problem was in my FT-991A so I sent it for
> warranty repair, but just got the call that they can't find anything wrong
> with it. It has no measurable spurious or out of band emissions. I'm at a
> loss here... I know people are using the same equipment (FT-991 + SDRplay)
> successfully; Simon Brown comes to mind.
>
> Here is a video I created demonstrating the problem with the FT-991 and
> showing that it doesn't appear with an Icom ID-880H.
> https://youtu.be/gXOIK5gLjgs
>
> I still think the problem must be in the radio, but if they can't find
> anything to fix then I'm out of luck. I'd love to hear any suggestions or
> feedback.
>
> Thanks,
> Alex VA3ASE
> _______________________________________________
> Sent via AMSAT-BB@?????.???. 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: 5
Date: Thu, 2 Aug 2018 13:46:55 -0500
From: Zach Metzinger <zmetzing@?????.???>
To: amsat-bb@?????.???
Subject: Re: [amsat-bb] FT-991A Transmit Interference
Message-ID: <a57ae568-3d51-90f6-1387-a2bed99c25eb@?????.???>
Content-Type: text/plain; charset=utf-8; format=flowed
On 8/2/18 1:35 PM, VA3ASE wrote:
> I'm having a technical problem and was wondering if anyone had any
> suggestions. I've been experimenting with using an FT-991A transmitter and
> SDR receiver to run full-duplex on the satellites. My problem is as soon as
> I key the FT-991A transmitter, my SDR receiver waterfall goes completely
> white and I don't hear anything but static. Classic overload symptoms.
Hello Alex,
Plastic case of the RSP1A == no shielding. The front-end filters can't
stop that which goes right around them.
If you put the RSP1A into a metal box and install a USB EMI filter, I'd
wager the problem will go away.
--- Zach
N0ZGO
------------------------------
Message: 6
Date: Thu, 2 Aug 2018 16:57:22 -0400 (EDT)
From: alex weimer <ingejack@???.???>
To: amsat-bb@?????.???
Subject: [amsat-bb] Birds-2 satellite
Message-ID: <1200569931.1188621.1533243442763@???????.???.???>
Content-Type: text/plain; charset=UTF-8
Since the sats have a APRS digipeater, does anyone know what the callsign
will be ?? How would we access the digipeater ?? I.E. The ISS is ARISS as is
NO884 !! What will the Birds-2 be ?? Thanks JACK KC7MG
------------------------------
Message: 7
Date: Thu, 2 Aug 2018 16:52:16 -0400 (EDT)
From: TERRY SURFACE <terrysurface1@???????????.???>
To: VA3ASE <va3ase@?????.???>
Cc: amsat-bb@?????.???
Subject: Re: [amsat-bb] FT-991A Transmit Interference
Message-ID:
<341311139.4659741.1533243136749.JavaMail.zimbra@???????????.???>
Content-Type: text/plain; charset=utf-8
Hello. I have two 991A radios, and both do the same thing. I am unable to
use them for transmit on two meters without killing the 70 CM RX. I use a
Kenwood TS 2000 for transmit and 991A for receive. Not the way I want to do
it, but I am for now, this allows the spectrum and waterfall for checking
out the entire transponder. Hope someone finds a solution.
73,N4IQV, Terry
----- Original Message -----
From: "VA3ASE" <va3ase@?????.???>
To: amsat-bb@?????.???
Sent: Thursday, August 2, 2018 2:35:54 PM
Subject: [amsat-bb] FT-991A Transmit Interference
Hi AMSAT friends,
I'm having a technical problem and was wondering if anyone had any
suggestions. I've been experimenting with using an FT-991A transmitter and
SDR receiver to run full-duplex on the satellites. My problem is as soon as
I key the FT-991A transmitter, my SDR receiver waterfall goes completely
white and I don't hear anything but static. Classic overload symptoms.
I've tried several things:
- Upgrading my receiver from an RTL-SDR to an SDRplay RSP1A: no improvement.
- Adding a duplexer as a band pass filter: no improvement.
- Transmitting with a vertical antenna about 40' away from my yagis: YES it
did solve the problem but is not a suitable solution.
I'm using the same yagi antenna setup that I've used successfully for years
with an FT-847, and have also had the same problem with a handheld Arrow.
At last I tried transmitting with a different radio, and the problem
disappears. I figured the problem was in my FT-991A so I sent it for
warranty repair, but just got the call that they can't find anything wrong
with it. It has no measurable spurious or out of band emissions. I'm at a
loss here... I know people are using the same equipment (FT-991 + SDRplay)
successfully; Simon Brown comes to mind.
Here is a video I created demonstrating the problem with the FT-991 and
showing that it doesn't appear with an Icom ID-880H.
https://youtu.be/gXOIK5gLjgs
I still think the problem must be in the radio, but if they can't find
anything to fix then I'm out of luck. I'd love to hear any suggestions or
feedback.
Thanks,
Alex VA3ASE
_______________________________________________
Sent via AMSAT-BB@?????.???. 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: Thu, 2 Aug 2018 19:53:18 -0400
From: Paul Stoetzer <n8hm@????.???>
To: TERRY SURFACE <terrysurface1@???????????.???>
Cc: VA3ASE <va3ase@?????.???>, amsat-bb@?????.???
Subject: Re: [amsat-bb] FT-991A Transmit Interference
Message-ID:
<CABzOSOqFYaRKfBX3OJXWAoGc6KT9NWW4SPdt=GzoTH3mCU79Gw@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
It sounds like the FT-991A?s harmonic suppression isn?t quite up to par.
73,
Paul, N8HM
On Thu, Aug 2, 2018 at 19:51 TERRY SURFACE <terrysurface1@???????????.???>
wrote:
> Hello. I have two 991A radios, and both do the same thing. I am unable to
> use them for transmit on two meters without killing the 70 CM RX. I use a
> Kenwood TS 2000 for transmit and 991A for receive. Not the way I want to do
> it, but I am for now, this allows the spectrum and waterfall for checking
> out the entire transponder. Hope someone finds a solution.
> 73,N4IQV, Terry
>
> ----- Original Message -----
> From: "VA3ASE" <va3ase@?????.???>
> To: amsat-bb@ct 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@?????.???. 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: Thu, 2 Aug 2018 20:53:16 -0500
From: "Alan" <wa4sca@?????.???>
To: <amsat-bb@?????.???>
Subject: Re: [amsat-bb] FT-991A Transmit Interference
Message-ID: <000001d42acc$bf6f3ba0$3e4db2e0$@?????.???>
Content-Type: text/plain; charset="utf-8"
If you have access to the ARRL QST test archives, their review of the
FT-991A is worth reading. While meeting all FCC requirements, neither TX or
RX signals are as clean as some other rigs. That _might_ be enough to
account for the differences.
73,
Alan
WA4SCA
<-----Original Message-----
<From: AMSAT-BB [mailto:amsat-bb-bounces@?????.???? On Behalf Of Paul
<Stoetzer
<Sent: Thursday, August 02, 2018 18:53 PM
<To: TERRY SURFACE <terrysurface1@???????????.???>
<Cc: VA3ASE AMSAT-BB@?????.???. 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@?????.???. 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@?????.???. 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: 10
Date: Fri, 3 Aug 2018 12:18:06 +0000 (UTC)
From: M5AKA <m5aka@?????.??.??>
To: amsat-bb@?????.???
Subject: Re: [amsat-bb] FT-991A Transmit Interference
Message-ID: <448230182.2408060.1533298686426@????.?????.???>
Content-Type: text/plain; charset=UTF-8
The wideband noise generated by the FT-991 has been noted in all the
reviews I've seen e.g. Peter Hart's Radcom review said "The wideband
transmitter noise output is rather poor, particularly on VHF".
Have you tried using a bandpass filter on the FT-991A ?
73 Trevor M5AKA
On Friday, 3 August 2018, 02:55:36 GMT+1, Alan <wa4sca@?????.???> wrote:
If you have access to the ARRL QST test archives, their review of the
FT-991A is worth reading.? While meeting all FCC requirements, neither TX or
RX signals are as clean as some other rigs.? That _might_ be enough to
account for the differences.
73,
Alan
WA4SCA
<-----Original Message-----
<From: AMSAT-BB [mailto:amsat-bb-bounces@?????.???? On Behalf Of Paul
<Stoetzer
<Sent: Thursday, August 02, 2018 18:53 PM
<To: TERRY SURFACE <terrysurface1@???????????.???>
<Cc: VA3ASE <va3ase@?????.???>; amsat-bb@?????.???
<Subject: Re: [amsat-bb] FT-991A Transmit Interference
<
<It sounds like the FT-991A?s harmonic suppression isn?t quite up to par.
<
<73,
<
<Paul, N8HM
<
<On Thu, Aug 2, 2018 at 19:51 TERRY SURFACE <terrysurface1@???????????.???>
<wrote:
<
<> Hello. I have two 991A radios, and both do the same thing. I am unable to
<> use them for transmit suitable solution.
<>
<> I'm using the same yagi antenna setup that I've used successfully for years
<> with an FT-847, and have also had the same problem with a handheld Arrow.
<>
<> At last I tried transmitting with a different radio, and the problem
<> disappears. I figured the problem was in my FT-991A so I sent it for
<> warranty repair, but just got the call that they can't find anything wrong
<> with it. It has no measurable spurious or out of band emissions. I'm at a
<> loss here... I know people are using the same equipment (FT-991 + SDRplay)
<> successfully; Simon Brown comes to mind.
<>
<> Here is a video I created demonstrating the problem with the FT-991 and
<> showing that it doesn't appear with an Icom ID-880H.
<> https://youtu.be/gXOIK5gLjgs
<>
<> I still think the problem must be in the radio, but if they can't find
<> anything to fix then I'm out of luck. I'd love to hear any suggestions or
<> feedback.
<>
<> Thanks,
<> Alex VA3ASE
<> _______________________________________________
<> Sent via AMSAT-BB@?????.???. 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@?????.???. 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@?????.???. 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@?????.???. 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: 11
Date: Fri, 3 Aug 2018 09:19:54 -0400
From: Mike Sprenger <mikesprenger@?????.???>
To: Paul Stoetzer <n8hm@????.???>
Cc: VA3ASE <va3ase@?????.???>, AMSAT-BB <amsat-bb@?????.???>
Subject: Re: [amsat-bb] FT-991A Transmit Interference
Message-ID:
<CAB4zG_+O7SH8FVJvAsYVgma-Q8BzKR6D_mq2NaKCbPALgTUD-A@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Hi Alex,
Think of ways to identify the RF path from the Yaesu to the SDR thats
overloading and obfuscating what you want to see on the SDR receiver. Is
it radiated or conducted in your cabling.
Have you isolated your power supplies between the SDR and the Yaesu ?
Perhaps RF is riding the DC cable.
(So run the SDR and the Yaesu on completely separate supplies, i.e. run the
Yaesu on a sufficient battery)
Also, if you transmit with the Yaesu into a dummy load directly attached,
is there RF overloading the SDR ? (This may verify the effectiveness of
the shielding of the transmitter)
Do the same with the ID880 to know if your dummy load is radiating, which
is a good control test case.
Look at all of your cables and question "could that be the RF path to the
RX ?" RF will ride a shield or a DC cable if permitted.
Interesting problem to solve.
73
Mike
W4UOO
On Thu, Aug 2, 2018 at 7:53 PM, Paul Stoetzer <n8hm@????.???> wrote:
> It sounds like the FT-991A?s harmonic suppression isn?t quite up to par.
>
> 73,
>
> Paul, N8HM
>
> On Thu, Aug 2, 2018 at 19:51 TERRY SURFACE <terrysurface1@???????????.???>
> wrote:
>
> > Hello. I have two 991A radios, and both do the same thing. I am unable to
> > use them for transmit on two meters without killing the 70 CM RX. I use a
> > Kenwood TS 2000 for transmit and 991A for receive. Not the way I want to
> do
> > it, but I am for now, this allows the spectrum and waterfall for checking
> > out the entire transponder. Hope someone finds a solution.
> > 73,N4IQV, Terry
> >
> > ----- Original Message -----
> > From: "VA3ASE" <va3ase@?????.???>
> > To: amsat-bb@?????.???
> > Sent: Thursday, August 2, 2018 2:35:54 PM
> > Subject: [amsat-bb] FT-991A Transmit Interference
> >
> > Hi AMSAT friends,
> >
> > I'm having a technical problem and was wondering if anyone had any
> > suggestions. I've been experimenting with using an FT-991A transmitter
> and
> > SDR receiver to run full-duplex on the satellites. My problem is as soon
> as
> > I key the FT-991A transmitter, my SDR receiver waterfall goes completely
> > white and I don't hear anything but static. Classic overload symptoms.
> >
> > I've tried several things:
> > - Upgrading my receiver from an RTL-SDR to an SDRplay RSP1A: no
> > improvement.
> > - Adding a duplexer as a band pass filter: no improvement.
> > - Transmitting with a vertical antenna about 40' away from my yagis: YES
> it
> > did solve the problem but is not a suitable solution.
> >
ressed
> 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
>
--
Thanks,
Mike Sprenger
(37.9167N 81.1244W is the Summit)
------------------------------
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End of AMSAT-BB Digest, Vol 13, Issue 271
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