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CX2SA > SATDIG 01.11.14 04:17l 956 Lines 30477 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.SAL.URY.SOAM
To : SATDIG@WW
Today's Topics:
1. NASA Completes First Review of Wallops Launch Site Damage
(Eric Rosenberg)
2. ICOM 706G phase noise (David G0MRF)
3. Re: ICOM 706G phase noise (Paul Stoetzer)
4. Special-event station for 40th anniversary of OSCAR 7 launch
(Patrick STODDARD (WD9EWK/VA7EWK))
5. Re: ICOM 706G phase noise (dnkucij@xxxxxxxxxxx.xxxx
6. Virgin Galactic "SpaceShipTwo" crash (Alan)
7. Office Closed (Martha)
8. Re: ICOM 706G phase noise (Doug - k4gkj)
9. Re: Virgin Galactic "SpaceShipTwo" crash (Bryce Salmi)
10. Re: Virgin Galactic "SpaceShipTwo" crash (Rich/wa4bue)
11. Re: Virgin Galactic "SpaceShipTwo" crash (Alan)
12. Re: ICOM 706G phase noise (David G0MRF)
13. FUNcube/AO-73 Mode change (Jim Heck)
14. Re: ICOM 706G phase noise (Greg D)
----------------------------------------------------------------------
Message: 1
Date: Fri, 31 Oct 2014 08:55:18 -0400
From: Eric Rosenberg <ericrosenberg.dc@xxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>, "pvrc@xxxxxxx.xxx.xxxx
<PVRC@xxxxxxx.xxx.xxx>
Subject: [amsat-bb] NASA Completes First Review of Wallops Launch Site
Damage
Message-ID:
<CAGX_=ke4W5dbMjY-iZGGe47HJsv2Y0yaWMkFonkhEgnesmq4Sg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
>From Via Satellite:
----------------------
NASA Completes First Review of Wallops Launch Site Damage
By Caleb Henry | October 30, 2014 | Satellite TODAY News Feed
[Via Satellite 10-30-2014] NASA's Wallops Incident Response Team has
concluded its preliminary assessment of the launch pad at Wallops Island,
Va. following Orbital Sciences' Oct. 28 Antares launch vehicle explosion.
Initial findings show the damage was largely contained to the southern
third of the island. The team discovered imploded doors and shattered
windows at many nearby support buildings. The closest buildings and a
sounding rocket launcher adjacent to the pad were the most affected
infrastructure. The transporter erector launcher and lightning suppression
rods at Pad 0A were also damaged.
Several environmental tests are currently underway. Air samples from three
different sites detected no hazardous substances, and the U.S. Coast Guard
and Virginia Marine Resources Commission have not observed obvious signs of
water pollution, such as oil sheens. More testing of air, water, and soil
samples are planned for comparative analysis.
The response team will take several weeks to continue evaluating the extent
and influence of the damage. Local authorities such as the Virginia
Department of Environmental Quality, the Virginia Department of Emergency
Management and the Virginia Marine Police are also involved. NASA cautions
anyone who discovers debris from the explosion to keep distance and report
it to the Incident Response Team at 757-824-1295.
------------------------------
Message: 2
Date: Fri, 31 Oct 2014 12:41:22 -0400
From: David G0MRF <g0mrf@xxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] ICOM 706G phase noise
Message-ID: <8D1C340A37CEC67-8AC-32AFF@xxxxxxxxxxxxx.xxxxxx.xxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Hi all.
Inspired by the FUN on the YouTube videos from the car park at Baltimore,
I've been trying to set up a satellite station using two independent radios.
An IC706G on 70cm transmit and an FT736R on 2m receive.
Antennas are a 4 ele yagi ( horizontal ) on 2m receive with an AMSAT-UK
filtered preamp. Transmit antenna is a 9 ele Tonna mounted vertically.
Antennas are on a rotator using a fibreglass boom about 1.8m long.
The problem: Whenever I press the 70cm transmit 'button' - ptt on SSB, or
key on CW I get S8 noise on the 2m receiver. (and S6 without the preamp)
Note...This does not appear to be RF overload as I can turn the power down
to minimum on SSB, even remove the microphone and the noise level remains.
On CW the noise level is constant when the 706 is in transmit mode. It does
not appear and disappear with each dot or dash.
My conclusion is that on 70cm the IC706G is transmitting something on 2m
whenever it is in it's transmit mode.- possibly phase noise.
Has anyone else come across this issue with ICOMs or is it just this one?
and is there a known minimalist solution.
Many thanks
David G0MRF
------------------------------
Message: 3
Date: Fri, 31 Oct 2014 13:34:56 -0400
From: Paul Stoetzer <n8hm@xxxx.xxx>
To: David G0MRF <g0mrf@xxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] ICOM 706G phase noise
Message-ID:
<CABzOSOoiuOwuoK-EvxcY+O0CFWAHVeMunnJ8Z72bCrAyg=dH6Q@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
David,
Try a diplexer on either the transmit or receive side (whichever works
better) with the common port to the antenna, the appropriate band port
hooked to the radio, and the other band port left disconnected. If
your Icom is putting something out on 2m when transmitting on 70cm,
that should filter it out.
73,
Paul, N8HM
On Fri, Oct 31, 2014 at 12:41 PM, David G0MRF <g0mrf@xxx.xxx> wrote:
>
> Hi all.
>
> Inspired by the FUN on the YouTube videos from the car park at Baltimore,
I've been trying to set up a satellite station using two independent radios.
An IC706G on 70cm transmit and an FT736R on 2m receive.
> Antennas are a 4 ele yagi ( horizontal ) on 2m receive with an AMSAT-UK
filtered preamp. Transmit antenna is a 9 ele Tonna mounted vertically.
> Antennas are on a rotator using a fibreglass boom about 1.8m long.
>
> The problem: Whenever I press the 70cm transmit 'button' - ptt on SSB,
or key on CW I get S8 noise on the 2m receiver. (and S6 without the preamp)
>
> Note...This does not appear to be RF overload as I can turn the power down
to minimum on SSB, even remove the microphone and the noise level remains.
> On CW the noise level is constant when the 706 is in transmit mode. It
does not appear and disappear with each dot or dash.
>
> My conclusion is that on 70cm the IC706G is transmitting something on 2m
whenever it is in it's transmit mode.- possibly phase noise.
>
> Has anyone else come across this issue with ICOMs or is it just this one?
and is there a known minimalist solution.
>
> Many thanks
>
> David G0MRF
>
>
>
>
>
>
> _______________________________________________
> 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://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 4
Date: Fri, 31 Oct 2014 10:43:24 -0700
From: "Patrick STODDARD (WD9EWK/VA7EWK)" <amsat-bb@xxxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Special-event station for 40th anniversary of
OSCAR 7 launch
Message-ID:
<CAN6TEUdtYCc5GuAbhbwFZw9_Q=DDdsT__GdEyeLAc-E6U+YseA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hi!
I have secured the special call sign W7O (WHISKEY SEVEN OSCAR)
for use in commemorating the 40th anniversary of the launch of
OSCAR 7 on 15 November 1974. I plan on having this call on the
air between 15 and 24 November 2014, working satellites and
possibly other bands. I will work satellite passes from Arizona,
including AO-7 passes, and hope to recruit a small group of
operators who can work other passes that cover eastern North
America along with other places I can't work from here (Europe,
north Africa, South America). I may also try to get some
operators working HF with this call.
I will handle the QSL requests for W7O during this period. I
am thinking of incorporating the original QSL card design
AMSAT used to confirm AO-7 reception reports from the 1970s
in the W7O card. (Does anyone have a good scan of both sides
of that 1970s QSL card? Not the 30th anniversary AO-7 card -
I have those, and there is a copyright on that design I do not
wish to violate.) The QSL cards will be printed after the
W7O activity wraps up. I will also upload W7O QSOs to ARRL's
Logbook of the World system.
Please contact me directly if you have any questions related
to this operation, or if you are willing to operate on satellites
and/or HF as W7O during this 10-day period.
Thanks in advance, and 73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
------------------------------
Message: 5
Date: Fri, 31 Oct 2014 14:28:59 -0400
From: dnkucij@xxxxxxxxxxx.xxx
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] ICOM 706G phase noise
Message-ID: <20141031142859.xc0wj5s5twc04g4c@xxxxxxx.xxxxxxxxxxx.xxx>
Content-Type: text/plain; charset=UTF-8; format="flowed"
Here's the AMSAT link about "Desense" that describes the method to try.
http://ww2.amsat.org/?page_id=2136
GL
Nick, KB1RVT
------------------------------
Message: 6
Date: Fri, 31 Oct 2014 15:02:01 -0500
From: Alan <wa4sca@xxxxx.xxx>
To: "AMSAT-BB" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Virgin Galactic "SpaceShipTwo" crash
Message-ID: <000001cff545$8a882340$9f9869c0$@xxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Just breaking:
http://preview.tinyurl.com/l5565d3
Another reminder that flight is never routine.
Alan
WA4SCA
------------------------------
Message: 7
Date: Fri, 31 Oct 2014 16:27:23 -0400
From: Martha <martha@xxxxx.xxx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>, Board of Directors <bod@xxxxx.xxx>
Subject: [amsat-bb] Office Closed
Message-ID:
<CAPk0USxC32N65jAHF6drzNPQTy0AJuscaYTx672YprASn_cywg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
The AMSAT office will be closed on Monday, November 3rd.
--
73- Martha
------------------------------
Message: 8
Date: Fri, 31 Oct 2014 17:10:15 -0400
From: Doug - k4gkj <k4gkj@xxxxxxxxxx.xxx>
To: n8hm@xxxx.xxxx g0mrf@xxx.xxx
Cc: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] ICOM 706G phase noise
Message-ID: <kh9q0e56w5tv87dscco1vf5r.1414789815097@xxxxx.xxxxxxx.xxx>
Content-Type: text/plain; charset=utf-8
My 706mk2g doesn't do this. And at the moment, I have a diplexer on my tower
to have one feedline share ?VHF & UHF antennas... ?I am not happy with the
2.5db+ of loss that comes along with putting that diplexer on... ?
Doug?
K4GKJ?
Doug Bennight
K4GKJ
850-528-5772
850-926-2052?
-------- Original message --------
From: Paul Stoetzer <n8hm@xxxx.xxx>
Date:
To: David G0MRF <g0mrf@xxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] ICOM 706G phase noise
David,
Try a diplexer on either the transmit or receive side (whichever works
better) with the common port to the antenna, the appropriate band port
hooked to the radio, and the other band port left disconnected. If
your Icom is putting something out on 2m when transmitting on 70cm,
that should filter it out.
73,
Paul, N8HM
On Fri, Oct 31, 2014 at 12:41 PM, David G0MRF <g0mrf@xxx.xxx> wrote:
>
> Hi all.
>
> Inspired by the FUN on the YouTube videos from the car park at Baltimore,
I've been trying to set up a satellite station using two independent radios.
An IC706G on 70cm transmit and an FT736R on 2m receive.
> Antennas are? a 4 ele yagi ( horizontal ) on 2m receive with an AMSAT-UK
filtered preamp. Transmit antenna is a 9 ele Tonna mounted vertically.
> Antennas are on a rotator using a fibreglass boom about 1.8m long.
>
> The problem:? Whenever I press the 70cm transmit 'button'? - ptt on SSB,
or key on CW I get S8 noise on the 2m receiver. (and S6 without the preamp)
>
> Note...This does not appear to be RF overload as I can turn the power down
to minimum on SSB, even remove the microphone and the noise level remains.
> On CW the noise level is constant when the 706 is in transmit mode. It
does not appear and disappear with each dot or dash.
>
> My conclusion is that on 70cm the IC706G is transmitting something on 2m
whenever it is in it's transmit mode.- possibly phase noise.
>
> Has anyone else come across this issue with ICOMs or is it just this one?
and is there a known minimalist solution.
>
> Many thanks
>
> David? G0MRF
>
>
>
>
>
>
> _______________________________________________
> 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://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://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 9
Date: Fri, 31 Oct 2014 14:21:07 -0700
From: Bryce Salmi <bstguitarist@xxxxx.xxx>
To: "APBIDDLE@xxxxxxx.xxxx <APBIDDLE@xxxxxxx.xxx>
Cc: AMSAT-BB <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Virgin Galactic "SpaceShipTwo" crash
Message-ID: <F9289D74-80CD-420E-9672-90414473B1B5@xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Spaceflight will be routine. However, routine is not defined as 100% safe.
Even driving down the street is not 100% safe, but it is routine.
Sent from my iPhone
> On Oct 31, 2014, at 13:02, Alan <wa4sca@xxxxx.xxx> wrote:
>
> Just breaking:
>
> http://preview.tinyurl.com/l5565d3
>
> Another reminder that flight is never routine.
>
>
> Alan
> WA4SCA
>
> _______________________________________________
> 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://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 10
Date: Fri, 31 Oct 2014 17:36:42 -0400
From: "Rich/wa4bue" <richard.siff@xxxxxxx.xxx>
Cc: "AMSAT-BB" <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Virgin Galactic "SpaceShipTwo" crash
Message-ID: <CEDD032F70A34484BCE741AECD28428A@xxxxxxxxx>
Content-Type: text/plain; format=flowed; charset=iso-8859-1;
reply-type=original
Rough week for pace travel.
Not routine yet. Routine leads to careless actions. We are still learning.
R
W4BUE
----- Original Message -----
From: "Bryce Salmi" <bstguitarist@xxxxx.xxx>
To: <APBIDDLE@xxxxxxx.xxx>
Cc: "AMSAT-BB" <amsat-bb@xxxxx.xxx>
Sent: Friday, October 31, 2014 5:21 PM
Subject: Re: [amsat-bb] Virgin Galactic "SpaceShipTwo" crash
> Spaceflight will be routine. However, routine is not defined as 100% safe.
> Even driving down the street is not 100% safe, but it is routine.
>
> Sent from my iPhone
>
>> On Oct 31, 2014, at 13:02, Alan <wa4sca@xxxxx.xxx> wrote:
>>
>> Just breaking:
>>
>> http://preview.tinyurl.com/l5565d3
>>
>> Another reminder that flight is never routine.
>>
>>
>> Alan
>> WA4SCA
>>
>> _______________________________________________
>> 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://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://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 11
Date: Fri, 31 Oct 2014 17:52:50 -0500
From: Alan <wa4sca@xxxxx.xxx>
To: "'Bryce Salmi'" <bstguitarist@xxxxx.xxx>, <APBIDDLE@xxxxxxx.xxx>
Cc: 'AMSAT-BB' <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Virgin Galactic "SpaceShipTwo" crash
Message-ID: <000001cff55d$66e9b670$34bd2350$@xxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Bryce,
In nearly 40 years as a pilot, both military and commercial, I had many
uneventful flights, but none I
treated as routine.
73s,
Alan
WA4SCA
<-----Original Message-----
<From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Bryce Salmi
<Sent: Friday, October 31, 2014 4:21 PM
<To: APBIDDLE@xxxxxxx.xxx
<Cc: AMSAT-BB
<Subject: Re: [amsat-bb] Virgin Galactic "SpaceShipTwo" crash
<
<Spaceflight will be routine. However, routine is not defined as 100% safe.
Even driving down the
street is not 100% safe, but
<it is routine.
<
<Sent from my iPhone
<
<> On Oct 31, 2014, at 13:02, Alan <wa4sca@xxxxx.xxx> wrote:
<>
<> Just breaking:
<>
<> http://preview.tinyurl.com/l5565d3
<>
<> Another reminder that flight is never routine.
<>
<>
<> Alan
<> WA4SCA
<>
<> _______________________________________________
<> 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://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://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 12
Date: Fri, 31 Oct 2014 19:54:12 -0400
From: David G0MRF <g0mrf@xxx.xxx>
To: k4gkj@xxxxxxxxxx.xxxx n8hm@xxxx.xxx
Cc: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] ICOM 706G phase noise
Message-ID: <8D1C37D1AC207AB-12EC-2FC66@xxxxxxxxxxxxx.xxxxxx.xxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Hi Doug / Paul / Nick / Patrick.
Thanks for all the comments and ideas. It seems the diplexer may work but
only if it can filter the 70cm transmit output, not for desense, but for
spurious emissions coming out of the IC706.
A quick check earlier today following Patrick's reply shows there is
significant wideband noise transmitted on 2m whenever the 706 enters its
transmit mode on 70cms. This seems to be a 'feature'
Moving the antennas apart by 30 feet reduces the noise to the general
background level. Unfortunately a 30 ft boom isn't a practical solution.
I've tried a cavity filter in the 435MHz transmit chain and miraculously the
noise on 2m disappeared. But again, a cavity is not the easiest thing to
include.
I'll have a look at the diplexers. Hopefully there will be one with a low
loss, but now I know the 706 is the problem I may just add a high pass
filter in line with the output on 435MHz.
Hopefully, after monitoring telemetry for the last 11 months I'll get this
up and running over the weekend and finally manage a QSO on AO-73
Fingers crossed.
Thanks for all the great suggestions
David
Here's the AMSAT link about "Desense" that describes the method to try.
http://ww2.amsat.org/?page_id=2136
GL
Nick, KB1RVT
_______________________________________________
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://amsat.org/mailman/listinfo/amsat-bb
-----Original Message-----
From: Doug - k4gkj <k4gkj@xxxxxxxxxx.xxx>
To: n8hm <n8hm@xxxx.xxx>; g0mrf <g0mrf@xxx.xxx>
CC: amsat-bb <amsat-bb@xxxxx.xxx>
Sent: Fri, 31 Oct 2014 21:10
Subject: Re: [amsat-bb] ICOM 706G phase noise
My 706mk2g doesn't do this. And at the moment, I have a diplexer on my tower
to have one feedline share VHF & UHF antennas... I am not happy with the
2.5db+ of loss that comes along with putting that diplexer on...
Doug
K4GKJ
Doug Bennight
K4GKJ
850-528-5772
850-926-2052
-------- Original message --------
From: Paul Stoetzer <n8hm@xxxx.xxx>
Date:
To: David G0MRF <g0mrf@xxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] ICOM 706G phase noise
David,
Try a diplexer on either the transmit or receive side (whichever works
better) with the common port to the antenna, the appropriate band port
hooked to the radio, and the other band port left disconnected. If
your Icom is putting something out on 2m when transmitting on 70cm,
that should filter it out.
73,
Paul, N8HM
On Fri, Oct 31, 2014 at 12:41 PM, David G0MRF <g0mrf@xxx.xxx> wrote:
>
> Hi all.
>
> Inspired by the FUN on the YouTube videos from the car park at Baltimore,
I've been trying to set up a satellite station using two independent radios.
An IC706G on 70cm transmit and an FT736R on 2m receive.
> Antennas are a 4 ele yagi ( horizontal ) on 2m receive with an AMSAT-UK
filtered preamp. Transmit antenna is a 9 ele Tonna mounted vertically.
> Antennas are on a rotator using a fibreglass boom about 1.8m long.
>
> The problem: Whenever I press the 70cm transmit 'button' - ptt on SSB,
or key on CW I get S8 noise on the 2m receiver. (and S6 without the preamp)
>
> Note...This does not appear to be RF overload as I can turn the power down
to minimum on SSB, even remove the microphone and the noise level remains.
> On CW the noise level is constant when the 706 is in transmit mode. It
does not appear and disappear with each dot or dash.
>
> My conclusion is that on 70cm the IC706G is transmitting something on 2m
whenever it is in it's transmit mode.- possibly phase noise.
>
> Has anyone else come across this issue with ICOMs or is it just this one?
and is there a known minimalist solution.
>
> Many thanks
>
> David G0MRF
>
>
>
>
>
>
> _______________________________________________
> 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://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://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 13
Date: Sat, 1 Nov 2014 00:16:12 -0000
From: "Jim Heck" <jimlist@xxxx.xxx>
To: "'AMSAT BB'" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] FUNcube/AO-73 Mode change
Message-ID: <000001cff569$0cb84d90$2628e8b0$@xxx>
Content-Type: text/plain; charset="us-ascii"
Hi Folks,
FUNcube/AO-73 is now in continuous transponder mode with low power
beacon, as at 23:01 UTC. Change back to Auto eclipse mode planned for Sunday
PM UTC.
PLEASE NOTE. Next weekend 8/9 Nov the sat will remain in 'Auto Eclipse
mode' with the transponder only available when it is in darkness. This is
because the sat high power beacon is required for a demonstration.
Enjoy the transponder
73s Jim G3WGM
------------------------------
Message: 14
Date: Fri, 31 Oct 2014 19:10:43 -0700
From: Greg D <ko6th.greg@xxxxx.xxx>
To: David G0MRF <g0mrf@xxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] ICOM 706G phase noise
Message-ID: <54544123.3090204@xxxxx.xxx>
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Hi David,
Just curious, but why even use the 706? The FT736R does both bands in
FDX...
Greg KO6TH
David G0MRF wrote:
>
>
> Hi Doug / Paul / Nick / Patrick.
>
> Thanks for all the comments and ideas. It seems the diplexer may work but
only if it can filter the 70cm transmit output, not for desense, but for
spurious emissions coming out of the IC706.
>
> A quick check earlier today following Patrick's reply shows there is
significant wideband noise transmitted on 2m whenever the 706 enters its
transmit mode on 70cms. This seems to be a 'feature'
> Moving the antennas apart by 30 feet reduces the noise to the general
background level. Unfortunately a 30 ft boom isn't a practical solution.
>
> I've tried a cavity filter in the 435MHz transmit chain and miraculously
the noise on 2m disappeared. But again, a cavity is not the easiest thing to
include.
> I'll have a look at the diplexers. Hopefully there will be one with a low
loss, but now I know the 706 is the problem I may just add a high pass
filter in line with the output on 435MHz.
>
> Hopefully, after monitoring telemetry for the last 11 months I'll get this
up and running over the weekend and finally manage a QSO on AO-73
>
> Fingers crossed.
>
> Thanks for all the great suggestions
>
> David
>
>
>
>
>
>
>
> Here's the AMSAT link about "Desense" that describes the method to try.
>
> http://ww2.amsat.org/?page_id=2136
>
> GL
>
> Nick, KB1RVT
>
> _______________________________________________
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> to all interested persons worldwide without requiring membership. Opinions
> expressed
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>
>
>
> -----Original Message-----
> From: Doug - k4gkj <k4gkj@xxxxxxxxxx.xxx>
> To: n8hm <n8hm@xxxx.xxx>; g0mrf <g0mrf@xxx.xxx>
> CC: amsat-bb <amsat-bb@xxxxx.xxx>
> Sent: Fri, 31 Oct 2014 21:10
> Subject: Re: [amsat-bb] ICOM 706G phase noise
>
>
>
> My 706mk2g doesn't do this. And at the moment, I have a diplexer on my
tower to have one feedline share VHF & UHF antennas... I am not happy with
the 2.5db+ of loss that comes along with putting that diplexer on...
> Doug
> K4GKJ
>
>
>
>
> Doug Bennight
> K4GKJ
> 850-528-5772
> 850-926-2052
>
>
>
>
>
>
> -------- Original message --------
> From: Paul Stoetzer <n8hm@xxxx.xxx>
> Date:
> To: David G0MRF <g0mrf@xxx.xxx>
> Cc: amsat-bb@xxxxx.xxx
> Subject: Re: [amsat-bb] ICOM 706G phase noise
>
>
> David,
>
> Try a diplexer on either the transmit or receive side (whichever works
> better) with the common port to the antenna, the appropriate band port
> hooked to the radio, and the other band port left disconnected. If
> your Icom is putting something out on 2m when transmitting on 70cm,
> that should filter it out.
>
> 73,
>
> Paul, N8HM
>
> On Fri, Oct 31, 2014 at 12:41 PM, David G0MRF <g0mrf@xxx.xxx> wrote:
>> Hi all.
>>
>> Inspired by the FUN on the YouTube videos from the car park at Baltimore,
I've been trying to set up a satellite station using two independent radios.
An IC706G on 70cm transmit and an FT736R on 2m receive.
>> Antennas are a 4 ele yagi ( horizontal ) on 2m receive with an AMSAT-UK
filtered preamp. Transmit antenna is a 9 ele Tonna mounted vertically.
>> Antennas are on a rotator using a fibreglass boom about 1.8m long.
>>
>> The problem: Whenever I press the 70cm transmit 'button' - ptt on SSB,
or key on CW I get S8 noise on the 2m receiver. (and S6 without the preamp)
>>
>> Note...This does not appear to be RF overload as I can turn the power
down to minimum on SSB, even remove the microphone and the noise level
remains.
>> On CW the noise level is constant when the 706 is in transmit mode. It
does not appear and disappear with each dot or dash.
>>
>> My conclusion is that on 70cm the IC706G is transmitting something on 2m
whenever it is in it's transmit mode.- possibly phase noise.
>>
>> Has anyone else come across this issue with ICOMs or is it just this one?
and is there a known minimalist solution.
>>
>> Many thanks
>>
>> David G0MRF
>>
>>
>>
>>
>>
>>
>> _______________________________________________
>> 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://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://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://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 member? Join now to support the amateur satellite program!
http://amsat.org/mailman/listinfo/amsat-bb
End of AMSAT-BB Digest, Vol 9, Issue 371
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