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CX2SA > SATDIG 01.07.08 01:09l 822 Lines 27197 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. Re: USB to serial adaptor (Nigel Gunn G8IFF/W8IFF)
2. Re: Alfa-Spid AzEl Rotator Experiences or Recommendations?
(john heath)
3. 436cp30 (Jim Danehy)
4. RS-15 heard again (Auke de Jong, VE6PWN)
5. Re: ARISS Opportunity... (AJ9N(AT)aol.com)
6. DX assist AO-7 (w7lrd(AT)comcast.net)
7. Re: Alfa-Spid AzEl Rotator Experiences or Recommendations?
(Alan P. Biddle)
8. Re: RS-15 heard again (w7lrd(AT)comcast.net)
9. Re: FW: THIS SHOULD PISS YOU OFF...................IT DID
ME!!!! (Dave Guimont)
10. Re: FW: THIS SHOULD PISS YOU OFF...................IT DID
ME!!!! (Ben Jackson)
11. CUTE-1.7+APDII picture information (Mineo Wakita)
12. Call for Papers--2008 ARRL/TAPR Digital Communications
Conference (Ford, Steve, WB8IMY)
13. Eliminating Desensing (Reicher, James)
14. Re: Eliminating Desensing (Simon Brown (HB9DRV))
15. Re: Eliminating Desensing (Andrew Glasbrenner)
16. Re: Eliminating Desensing (Simon Brown (HB9DRV))
----------------------------------------------------------------------
Message: 1
Date: Sun, 29 Jun 2008 16:38:31 -0400
From: Nigel Gunn G8IFF/W8IFF <nigel(AT)ngunn.net>
Subject: [amsat-bb] Re: USB to serial adaptor
To: tjjapha(AT)earthlink.net
Cc: amsat-bb <amsat-bb(AT)amsat.org>
Message-ID: <4867F2C7.9010005(AT)ngunn.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
You do?
I didn't see a set up.
It just installed and worked and set itself to COM:8
ANTHONY JAPHA wrote:
You set the COM ports in setting up, but never again.
--
<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
Nigel A. Gunn. G8IFF W8IFF (was KC8NHF)
59 Beadlemead, Milton Keynes, MK6 4HF, England. 07951079089 OR
1865 El Camino Drive, Xenia, OH 45385-1115, USA 937 825 5032
e-mail nigel(AT)ngunn.net www http://www.ngunn.net
Member of ARRL, GQRP #11396, QRPARCI #11644, SOC #548, Flying Pig #385,
Dayton ARA #2128, AMSAT-NA AMSAT-UK, LM-1691, MKARS,
<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
------------------------------
Message: 2
Date: Sun, 29 Jun 2008 22:08:00 +0100
From: "john heath" <g7hia(AT)btinternet.com>
Subject: [amsat-bb] Re: Alfa-Spid AzEl Rotator Experiences or
Recommendations?
To: <APBIDDLE(AT)MAILAPS.ORG>
Cc: amsat <amsat-bb(AT)amsat.org>
Message-ID: <001101c8da2c$36efa3b0$4101a8c0(AT)MainPC>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hi,
I have had an alpha spid az/el rotator for over 12 months now and have found
it to be an excellent unit.
It is mechanically very robust and turns my 5 el 2m X yagi and 19 el 70cms
X yagi with ease. The Spid will run on AC or DC. After a few months running
on my shack 13.8V supply I decided to buy a toroidal transformer with 20V
output and make a dedicated PSU for the Spid. This proved to be much better
in that the rotation time for a full 360 degrees is now reduced to 61
seconds. The "mouse" control is a very nice extra feature, very handy on
the operating desk.
If you go for full computer control for az/el it is fairly easy to set up, I
used the tracking program Orbitron.
I can only speak for the UK distributor Braeside Communications, whose
service and responsiveness to questions was first class, even getting e-mail
responses back quickly at the weekend.
Criticisms - the manual supplied for the UK could have benefited from a few
improvements, which I believe are in hand.
Tips - follow the recommendation to allow plenty of cable drop from your
antennas. The spid can travel past 360 degrees and could pull the cables out
if you don't have enough slack. Keep a note of the pin outs and cable
colours back to your shack, just in case you need to do repairs in the
future.
73 John G7HIA
ps/ no connection with the companies other than as as satisfied customer.
------------------------------
Message: 3
Date: Sun, 29 Jun 2008 17:16:00 -0400
From: "Jim Danehy" <jdanehy(AT)cinci.rr.com>
Subject: [amsat-bb] 436cp30
To: <apbiddle(AT)united.net>, <amsat-bb(AT)amsat.org>
Message-ID: <E2993F1198AD4422B7C0E599C069E895(AT)JamesPC>
Content-Type: text/plain; charset="iso-8859-1"
Alan (wa4sca)
I think many of us have come to accept (not expect) glitches from
manufacturers. M Square apologized. I told them we all goof up at some time. I
heard from a few folks with a direct email. One told me that he did not
measure his elements. He just sorted them by size. The purpose of my email was
to call attention that you can not do that and get the maximum results from
the product. It can be difficult to call attention to a mistake by someone
with a good reputation. I may add the polarity switcher and appreciate your
"heads up". The drawing for my beam shows a 1994 date for the last revision.
The initial drawing was 1990.
Jim W9VNE
------------------------------
Message: 4
Date: Sun, 29 Jun 2008 15:17:48 -0600
From: "Auke de Jong, VE6PWN" <sparkycivic(AT)shaw.ca>
Subject: [amsat-bb] RS-15 heard again
To: AMSAT-BB <amsat-bb(AT)amsat.org>
Message-ID: <001301c8da2d$94e18410$6400a8c0(AT)sparkys>
Content-Type: text/plain; charset="iso-8859-1"
I just copied the beacon on 29.351, after not hearing anything for a long
tmie.
It's sending relatively short duration pulses today... 1 second on, 2 seconds
off, give or take... later in the ascending pass(as I write this) , times are
up to greater-than 4 seconds off /.75 seconds on Does that mean the
spacecraft is warm?
Strange, that this is the ONLY mode-A signal around these days-besides AO-7 if
she feels like it ;)
Auke de Jong
VE6PWN
DO33go
Edmonton, AB
------------------------------
Message: 5
Date: Sun, 29 Jun 2008 18:24:15 EDT
From: AJ9N(AT)aol.com
Subject: [amsat-bb] Re: ARISS Opportunity...
To: ka3hdo(AT)comcast.net, amsat-bb(AT)amsat.org
Message-ID: <d06.356c3cbf.3599658f(AT)aol.com>
Content-Type: text/plain; charset="US-ASCII"
Hi all,
I listened to the Robinson contact via the IRLP Discovery Reflector on the
Internet on the 25th. Several of the other ARISS mentors also listened in.
Nancy WH6PN did her normal outstanding job. At our weekly telecon meeting
later that same day we did discuss the audio levels and time delays;
something
we always discuss after a telebridge contact.
For this contact there was a delay of about 5.5 to 6 minutes between real
time and when it came across the Internet. So if one was listening only at
the
real time AOS and gave up after a minute or 2; then you would have missed
the contact. There is always about a 5 minute delay of the audio when it
comes
across the Internet. I believe that if you are listening in on an IRLP
repeater that the audio is delayed only a few seconds.
At the moment we have had 350 successful contacts. I believe we have had 3
contacts that were deemed outright failures. We have had I think 2 or 3 that
were considered failures on the scheduled contact day but were rescheduled
and were successful on the 2nd attempt. ARISS says congratulations to all of
the school groups and hams around the world who have made that happen. Often
times, that is the first satellite contact for the hams.
When Kenneth or I post the ARISS announcements, we do try to indicate if
Echolink or IRLP will be included but often times it is a last minute
decision.
If it is a telebridge contact, then the odds are pretty high that it will be
on one or both. If it is a direct contact, then it is up to the ham group
doing the contact to decide if they want to feed audio to IRLP, Echolink, or
to their own webpage as it is an extra burden on them. ARISS does not
require
a group to do a simulcast but does encourage it. If we know it might
happen, then I usually indicate "watch". If we know it is going to happen,
the I
usually indicate "should be" or something along those lines.
As far as NASA TV providing coverage, we have been told to not expect it and
not to ask for it. Remember ARISS is a guest on the ISS and we don't want
to wear out our welcome. So ARISS does not request coverage. If on the oft
chance that a camera does show an ARISS contact in progress, then consider it
a blessing.
Hope this helps. ARISS encourages everyone to find a school, fill out the
application, and get on the waiting list. I think you will find it a great
experience. Think of it as your most tension filled Field Day that you will
ever do. Plan on anywhere from 500 to 700 people hours; all of this for a
10
minute contact that the kids (and parents too) will remember for a long long
time.
73,
Charlie Sufana AJ9N
One of the ARISS mentors
In a message dated 6/29/2008 9:35:03 A.M. Central Daylight Time,
ka3hdo(AT)comcast.net writes:
Dexter,
This is a very interesting comment from the JSC Public Affairs Office. As a
NASA employee and the ARISS Chair, I will make sure we get this comment
clarified. This sounds very strange and out of character from our dealings
with the NASA Public Affairs Office. It may be one person's misperceptions,
which needs to be clarified.
You all probably know this, but the ARISS success rate with schools is well
over 90%, so reliability is not an issue. That is why we have mentors
working with each school.
Now, WRT the IRLP and echolink, I cannot answer that right this moment as I
was not on the Operations teleconference last week, so I did not hear what
happened. Kenneth Ransom and Charlie Sufana follow this reflector pretty
closely and I am sure they will speak up before I get the info and get it in
an e-mail. But we will provide details on this for you and those on bb
fairly soon.
I thank you for your sincere interest in the ARISS program. And your
interest in inspiring students to pursue careers in science and engineering.
And to pursue the amateur radio hobby.
73, Frank Bauer, KA3HDO
AMSAT V.P. for Human Spaceflight Programs
ARISS International Chairman
---------------------------------------------
From: Dexter N Muir <dexy(AT)ihug.co.nz>
Subject: [amsat-bb] ARISS Opportunity...
To: amsat-bb(AT)amsat.org
Message-ID: <200806281503.14020.dexy(AT)ihug.co.nz>
Content-Type: text/plain; charset="us-ascii"
Greetings all
First post, so I hope it works.
Here is reply from NASA (and my original)
<Quote>
Dear Mr. Muir:
Thank you for your note. We are sorry about your disappointment.
Speaking just of NASA TV, we do not carry Ham radio events because of
reliability issues.
We wish we could offer you better news. We appreciate your interest in
the space program.
Thanks,
The JSC PAO Web Team
-----Original Message-----
From: Dexter N Muir [mailto:dexy(AT)ihug.co.nz]
Sent: Wednesday, June 25, 2008 8:24 PM
To: JSC-HSF-Web-Mail
Subject: Opportunity lost!
Greetings from 'Down Under' (KiwiSat land)
A golden opportunity lost!
ARISS had scheduled a contact with Robinson Elementary School,
Robinson,
Texas via telebridge WH6PN in Hawaii on 25 Jun 2008 at 15:45 UTC. At
this
time ISS _was_ over Hawaii, and ISS was scheduled to be in its Live
Commentary period.
There was NO audio from the telebrige WH6PN on either Echolink or the
IRLP
Discovery Reflector, and NASA TV's 'live coverage' segment made
absolutely NO
mention of the event - in fact, no 'on-board' coverage was shown at all!
ISS
was out of range of TDRSS earlier, but would surely have been back in
touch
by then? A camera at the ARISS position should have been easy to
arrange,
even if there is not one already present in that segment.
What happened? Was there some other pressing event that could not be
re-scheduled? A technical fault (though nothing was mentioned of such)?
Did 'dirtside' cancel at the last minute? All Internet links showed the
event would run as advertised right up to time.
Echolink *AMSAT* Conference gives feedback on who is connected, and I
observed 6 other stations on at that time (incidentally 3:45 AM next
morning
here in New Zealand). That is 6 parents or grandparents (like me) keen
to
demonstrate live one-on-one communications with an Astronaut IN SPACE,
who
are now extremely disappointed. For myself, it was my first attempt at
such
a conference, and I am _really_ glad I tried solo without getting 3
grandkids
out of bed.
Despite this disappointment, I will try again (solo), and given at
least
_some_ measure of success am likely to bring said children and perhaps
others
to witness the event some time in the future. THESE are your REAL
audience -
the Astronauts, Scientists and Engineers of the future!
Sincerely
Dexter N Muir, ZL2DEX (Radio Ham since 1969)
Levin, New Zealand
</Quote>
Is this really a reliability issue, or somebody so high they don't smell
very nice (thinking more govt than anything else) deciding that Amateur =
Ham-fisted, and not realising that the 'Hams' involved are mostly
professionals and, because they LOVE what they do (the original meaning,
from
Latin), make professional-level efforts to DO IT RIGHT.
Besides, the exercise is NOT 'Carrying Ham radio events', but more an
issue
of continuing existing coverage, in similar manner to one of the Astronauts
doing a video-tour of the premises (which they do from time to time). As I
had pointed out, there is probably a camera already there - the 'Ham Shack'
is in or near the 'Kitchen' area, which has been 'vid-casted' before.
Can we do better? Can we pressure someone/somewhere to not let this sort
of opportunity pass again?
BTW - what DID happen? Anyone?
_______________________________________________
Sent via AMSAT-BB(AT)amsat.org. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
**************Gas prices getting you down? Search AOL Autos for
fuel-efficient used cars.
(http://autos.aol.com/used?ncid=aolaut00050000000007)
------------------------------
Message: 6
Date: Sun, 29 Jun 2008 22:32:02 +0000
From: w7lrd(AT)comcast.net
Subject: [amsat-bb] DX assist AO-7
To: AMSAT-BB(AT)amsat.org (AMSAT-BB)
Message-ID:
<062920082232.12491.48680D62000BED6D000030CB22165662760B9D04C999(AT)comc
ast.net>
Content-Type: text/plain
Hello everyone
I'm trying to stretch the foot print, again. I am trying to QSO with Paul
2M1EUB. We share a ever so short window. I'm not sure of his email
connection at his portable QTH for this week, his grid is IO87rj, I am in
CN89wk should someone know how to figure the distance I'd like to know.
Somewhere there is web link that will figure that. Also does anyone know his
favorite downlink spot on AO-7, time is too short to hunt around. Should Paul
and I make this QSO it might even best a good dx connect by our dear friend
K3SZH. We must keep Joe on his toes!
73 & thanks
Bob W7LRD
Seattle CN87wk
--
"if this were easy, everyone would be doing it"
------------------------------
Message: 7
Date: Sun, 29 Jun 2008 17:55:36 -0500
From: "Alan P. Biddle" <APBIDDLE(AT)UNITED.NET>
Subject: [amsat-bb] Re: Alfa-Spid AzEl Rotator Experiences or
Recommendations?
To: "'john heath'" <g7hia(AT)btinternet.com>
Cc: 'amsat' <amsat-bb(AT)amsat.org>
Message-ID: <D3BF066647CE46F08F7F1AE3B83A56B9(AT)WA4SCA>
Content-Type: text/plain; charset="us-ascii"
John,
Precisely the kind of practical experience I am looking for. I have an M2
22 element CP on 2 meters and 42 element CP on 70 cms, plus a 42 element 23
cm beam and a small 13 cm dish. The Yaesu rotators have handled them for
years with careful balancing, but it looks as if the elevation rotator has
packed it in. With luck it is just the starting capacitor, but we shall see
when I crack it open. Even if fixable, it is probably time, one last time,
to install something which should handle any reasonable growth.
Again, thanks for the tips.
Alan
WA4SCA
------------------------------
Message: 8
Date: Mon, 30 Jun 2008 01:23:40 +0000
From: w7lrd(AT)comcast.net
Subject: [amsat-bb] Re: RS-15 heard again
To: "Auke de Jong, VE6PWN" <sparkycivic(AT)shaw.ca>, AMSAT-BB
<amsat-bb(AT)amsat.org>
Message-ID:
<063020080123.11404.4868359C00046D3800002C8C22155538940B9D04C999(AT)comc
ast.net>
Content-Type: text/plain
I have tried at times to give it a shot of RF uplink, "just in case". I mean
after all AO-7 came back to us! Maybe it just needs enough up RF to jump
start it. Does anyone know what it's final demise was from?
73 Bob W7LRD
--
"if this were easy, everyone would be doing it"
-------------- Original message --------------
From: "Auke de Jong, VE6PWN" <sparkycivic(AT)shaw.ca>
> I just copied the beacon on 29.351, after not hearing anything for a long
tmie.
> It's sending relatively short duration pulses today... 1 second on, 2
seconds
> off, give or take... later in the ascending pass(as I write this) , times
are up
> to greater-than 4 seconds off /.75 seconds on Does that mean the spacecraft
is
> warm?
>
> Strange, that this is the ONLY mode-A signal around these days-besides AO-7
if
> she feels like it ;)
>
>
>
> Auke de Jong
> VE6PWN
> DO33go
> Edmonton, AB
>
> _______________________________________________
> Sent via AMSAT-BB(AT)amsat.org. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 9
Date: Sat, 28 Jun 2008 20:30:51 -0700
From: Dave Guimont <dguimon1(AT)san.rr.com>
Subject: [amsat-bb] Re: FW: THIS SHOULD PISS YOU
OFF...................IT DID ME!!!!
To: Nick Laub <minn_nick(AT)hotmail.com>
Cc: amsat-bb(AT)amsat.org
Message-ID:
<20080630033101.IRDF2063.cdptpa-omta02.mail.rr.com(AT)Dave.san.rr.com>
Content-Type: text/plain; charset="us-ascii"; format=flowed
>
>Subject: Fw: THIS SHOULD PISS YOU OFF...................IT DID ME!!!!
>Date: Mon, 30 Jun 2008 01:40:29 +0000
>
>
>----------
>From: JAGTRIG9(AT)aol.com
>Sent: Thursday, June 12, 2008 7:44 PM
>To: JAGTRIG9(AT)aol.com
>Subject: THIS SHOULD PISS YOU OFF...................IT DID ME!!!!
>
>
>This is an insult and a kick in the butt to all of us...
>
>Get mad and pass it on - I don't know how, but maybe some good
>Will come of this travesty.
>
>
>If the immigrant is over 65 they can apply for SSI and Medicaid and get
>More than a woman on Social Security, who worked from 1944
>till 2004, only getting $791 per month because she was born in 1924 and
>There is a 'catch 22.
Liscensed since 1952, politics and women were NEVER DISCUSSED in/on
HAM RADIO!!
What in the hell has changed????......
Women ok, but had no idea the Republicans are that desperate!!
Good for the dems!!
END OF MY POLITICS...
73, Dave, WB6LLO
dguimon1(AT)san.rr.com
Disagree: I learn....
Pulling for P3E...
------------------------------
Message: 10
Date: Mon, 30 Jun 2008 06:16:01 -0400
From: Ben Jackson <bbj(AT)innismir.net>
Subject: [amsat-bb] Re: FW: THIS SHOULD PISS YOU
OFF...................IT DID ME!!!!
To: Dave Guimont <dguimon1(AT)san.rr.com>
Cc: Nick Laub <minn_nick(AT)hotmail.com>, amsat-bb(AT)AMSAT.Org
Message-ID: <4868B261.4010308(AT)innismir.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Dave Guimont wrote:
| END OF MY POLITICS...
Please Dave, don't tease us like that!
- --
Ben Jackson - N1WBV - New Bedford, MA
bbj <at> innismir.net - http://www.innismir.net/
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------------------------------
Message: 11
Date: Mon, 30 Jun 2008 20:15:21 +0900
From: Mineo Wakita <ei7m-wkt(AT)asahi-net.or.jp>
Subject: [amsat-bb] CUTE-1.7+APDII picture information
To: amsat-bb(AT)amsat.org
Message-ID: <99C8DAA2967126ei7m-wkt(AT)asahi-net.or.jp>
Content-Type: text/plain; charset=us-ascii
[CUTE-1.7+APDII Earth 3rd picture]
The photo was taken at 01:08:30 (UTC) on Jun 25, 2008.
Position of the satellite was;
Lat: 44.9 degN
Lon: 134.3 degE
Alt: 621.3 km
Horizontal angle of view is 58degrees.
Over Russia Vladivostok
Japanese weather satellite, "MTSAT-1R" took a picture of
clouds on 01:00 UTC on Jun 25, 2008.
We, the Tokyo Tech Ground Station, are still investigating what is
in this picture. Carefully watch it and try to find "something"!
http://lss.mes.titech.ac.jp/ssp/cute1.7/blog/01-04.jpg
http://www.ne.jp/asahi/hamradio/je9pel/cut17ap2.htm
JE9PEL, Mineo Wakita
------------------------------
Message: 12
Date: Mon, 30 Jun 2008 09:45:43 -0400
From: "Ford, Steve, WB8IMY" <sford(AT)arrl.org>
Subject: [amsat-bb] Call for Papers--2008 ARRL/TAPR Digital
Communications Conference
To: "RTTY Reflector" <rtty(AT)contesting.com>, <amsat-bb(AT)AMSAT.Org>,
<vhf(AT)w6yx.stanford.edu>, <psk31(AT)bipt106.bi.ehu.es>,
<digitalradio(AT)yahoogroups.com>
Message-ID:
<AD6F46BB3421B241903D155572BA86FE03BC07F7(AT)cartagia.ARRLHQ.ORG>
Content-Type: text/plain; charset="us-ascii"
Technical papers are solicited for presentation at the 27th Annual ARRL
and TAPR Digital Communications Conference to be held September 26-28,
2008 in Chicago, Illinois. These papers will also be published in the
Conference Proceedings (you do NOT need to attend the conference to have
your paper included in the Proceedings). The submission deadline is July
31. Please send papers to:
Maty Weinberg
ARRL
225 Main St
Newington, CT 06111
or you can make your submission via e-mail to: maty(AT)arrl.org
Papers will be published exactly as submitted and authors will retain
all rights.
73 . . . Steve, WB8IMY
ARRL
------------------------------
Message: 13
Date: Mon, 30 Jun 2008 11:50:16 -0500
From: "Reicher, James" <JReicher(AT)hrblock.com>
Subject: [amsat-bb] Eliminating Desensing
To: <amsat-bb(AT)amsat.org>
Message-ID:
<95ADAAE74104344D9B6F961E4DAD65980372543B(AT)WHQMSG05.hrbinc.hrblock.net
>
Content-Type: text/plain; charset="iso-8859-1"
I got significant de-sensing of my 2 meter downlink from my 70cm uplink at
Field Day. I know a good part of it was due to the short cross-boom (about 4
feet) I was using. I would like to decrease the de-sense on this set-up
before I permanently install it at my home station. Any and all suggestions
are welcome.
73 de W0HV, Jim in Raymore, MO?
Light travels faster than sound... This is why some people appear bright
until you hear them speak.
------------------------------
Message: 14
Date: Mon, 30 Jun 2008 19:18:48 +0200
From: "Simon Brown \(HB9DRV\)" <simon(AT)hb9drv.ch>
Subject: [amsat-bb] Re: Eliminating Desensing
To: <amsat-bb(AT)amsat.org>
Message-ID: <3F198345D5444E73834B81F2EC5ECF9E(AT)doubletrouble>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Same here with TS-2000, 6ft *aluminium* boom and SSB Electronics masthead
pre-amps.
I'm thinking about a 6ft to 9ft fibreglass boom anyway, I would be
interested also in user comments.
Simon Brown, HB9DRV
--------------------------------------------------
From: "Reicher, James" <JReicher(AT)hrblock.com>
> I got significant de-sensing of my 2 meter downlink from my 70cm uplink at
> Field Day. I know a good part of it was due to the short cross-boom
> (about 4 feet) I was using. I would like to decrease the de-sense on this
> set-up before I permanently install it at my home station. Any and all
> suggestions are welcome.
------------------------------
Message: 15
Date: Mon, 30 Jun 2008 13:22:09 -0400 (GMT-04:00)
From: Andrew Glasbrenner <glasbrenner(AT)mindspring.com>
Subject: [amsat-bb] Re: Eliminating Desensing
To: "Reicher,James" <JReicher(AT)hrblock.com>, amsat-bb(AT)AMSAT.Org
Message-ID:
<2155705.1214846530014.JavaMail.root(AT)elwamui-
rustique.atl.sa.earthlink.net>
Content-Type: text/plain; charset=UTF-8
It's unusual to see desense on 2m receive from a 70cm uplink, but I think the
same solution can be applied. Many use a common 2m/70cm diplexer as a high
pass/low pass filter. In this case you would want to feed the 2m antenna to
the common port of the diplexer, and the 2m port of the diplexer to the input
of either your preamp or rig if you do not have a preamp. This blocks your
transmitted signal from the receiver/preamp input very effectively.
http://www.amsat.org/amsat-new/articles/Mode-J/ describes this for 70cm
desense issues.
Another option is to use a preamp with good filtering on the input. I had
issues with Mode J desense with my Icom AG-35 preamp, but have none now that I
have switched to SSB Electronics preamps.
As always, Your Mileage May Vary (YMMV).
73, Drew KO4MA
-----Original Message-----
>From: "Reicher, James" <JReicher(AT)hrblock.com>
>Sent: Jun 30, 2008 12:50 PM
>To: amsat-bb(AT)amsat.org
>Subject: [amsat-bb] Eliminating Desensing
>
>I got significant de-sensing of my 2 meter downlink from my 70cm uplink at
Field Day. I know a good part of it was due to the short cross-boom (about 4
feet) I was using. I would like to decrease the de-sense on this set-up
before I permanently install it at my home station. Any and all suggestions
are welcome.
>
>73 de W0HV, Jim in Raymore, MO?
>Light travels faster than sound... This is why some people appear bright
until you hear them speak.
>
>_______________________________________________
>Sent via AMSAT-BB(AT)amsat.org. Opinions expressed are those of the author.
>Not an AMSAT-NA member? Join now to support the amateur satellite program!
>Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 16
Date: Mon, 30 Jun 2008 20:06:45 +0200
From: "Simon Brown \(HB9DRV\)" <simon(AT)hb9drv.ch>
Subject: [amsat-bb] Re: Eliminating Desensing
To: "AMSAT" <amsat-bb(AT)amsat.org>
Message-ID: <F506CE83A788481987EAF0E206AF2733(AT)doubletrouble>
Content-Type: text/plain; charset="UTF-8"
Jim,
We're talking 100W or so. Any chance of a link to a decent diplexer for the
appliance operator?
Simon Brown, HB9DRV
From: Jim Wright
A good start might be a "diplexer" at the antenna to terminate the energy you
do not want presented at the receiver. Put a termination on the uhf port and
stick it in the vhf side of the feedline, assuming you are running two coax
cables down to the shack. If the VHF is desensing the UHF, do the same thing
in the UHF feedline with a termination in the VHF port. You don't say how
much power you were running, but there comes a time when too much is too much.
------------------------------
_______________________________________________
Sent via amsat-bb(AT)amsat.org. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
http://amsat.org/mailman/listinfo/amsat-bb
End of AMSAT-BB Digest, Vol 3, Issue 324
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