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CX2SA > SATDIG 01.07.08 01:08l 402 Lines 12968 Bytes #999 (0) @ WW
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Sent: 080630/2315Z @:CX2SA.LAV.URY.SA #:14264 [Minas] FBB7.00e $:14264_CX2SA
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: Eliminating Desensing (John W Lee)
2. Re: Eliminating Desensing (Jim Wright)
3. Microwave Modules MMF-200-7 UHF Filter for sale (Bill Bruno)
4. De-sense (Clint Bradford)
5. Estimating Distance (Clint Bradford)
6. Re: Eliminating Desensing (rnutter(AT)networkref.com)
7. Re: Eliminating Desensing (Simon Brown (HB9DRV))
8. Re: Estimating Distance (Andrew Glasbrenner)
----------------------------------------------------------------------
Message: 1
Date: Mon, 30 Jun 2008 10:15:46 -0800
From: John W Lee <k6yk(AT)juno.com>
Subject: [amsat-bb] Re: Eliminating Desensing
To: glasbrenner(AT)mindspring.com
Cc: JReicher(AT)hrblock.com, amsat-bb(AT)amsat.org
Message-ID: <20080630.101702.2092.6.k6yk(AT)juno.com>
Content-Type: text/plain; charset=utf-8
Something else to try,
hook up the transmit side of the rig to a dummy load
and see how your receive is. It may be something in the
rig causing it, not the proximity of the antennas.
I get this problem sometimes and have other vhf/UHF antennas
that are maybe 50 feet away from the satellite antennas. I can transmit
on an antenna 50 feet away and pointed away from the receive antenna
and still get it sometimes.
73,
John K6YK
On Mon, 30 Jun 2008 13:22:09 -0400 (GMT-04:00) Andrew Glasbrenner
<glasbrenner(AT)mindspring.com> writes:
> 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
>
>
>
>
> _______________________________________________
> 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
>
____________________________________________________________
Turn your passion into a profession. Click here to find a film school near
you.
http://thirdpartyoffers.juno.com/TGL2141/fc/Ioyw6i3l7QCi3mKYvxTfNWYZUdrpJ4HShB
1AsDUM06qOO8RVY79JCN/
------------------------------
Message: 2
Date: Mon, 30 Jun 2008 13:02:02 -0500 (CDT)
From: Jim Wright <wrightjrjr(AT)verizon.net>
Subject: [amsat-bb] Re: Eliminating Desensing
To: "Simon Brown (HB9DRV)" <simon(AT)hb9drv.ch>
Cc: amsat-bb(AT)amsat.org
Message-ID:
<4848219.6006921214848922707.JavaMail.javamailuser(AT)localhost>
Content-Type: text/plain; charset=UTF-8; format=flowed
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.
Using two runs of 100 feet of 9913 on my TS2000, I only need the
diplexer on the UHF coax. Funny how the third harmonic on VHF gets to
be awfully close to the UHF frequency of interest.
My watt meter can't tell the difference in UHF or 3 times VHF when I try
to read the power. HI.
73,
Jim WA4IVM
On Mon, Jun 30, 2008 at 1:18 PM, Simon Brown (HB9DRV) wrote:
> 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
<mailto:JReicher(AT)hrblock.com> ? <mailto: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.
?
_______________________________________________
Sent via AMSAT-BB(AT)amsat.org. <mailto:AMSAT-BB(AT)amsat.org> ?
<mailto: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
<http://amsat.org/mailman/listinfo/amsat-bb> ?
<http://amsat.org/mailman/listinfo/amsat-bb>
------------------------------
Message: 3
Date: Mon, 30 Jun 2008 14:21:53 -0400
From: "Bill Bruno" <billbruno(AT)earthlink.net>
Subject: [amsat-bb] Microwave Modules MMF-200-7 UHF Filter for sale
To: "Amsat-bb(AT)amsat.org" <amsat-bb(AT)amsat.org>
Message-ID: <001b01c8dade$2d476e30$0300a8c0(AT)billslaptop>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Microwave Modules MMF-200-7 UHF Filter for sale. New, never used, $35.
If interested please contact me off list.
Bill......KB2RC
------------------------------
Message: 4
Date: Mon, 30 Jun 2008 14:45:08 -0400 (EDT)
From: Clint Bradford <clintbrad4d(AT)earthlink.net>
Subject: [amsat-bb] De-sense
To: amsat-bb(AT)amsat.org, amsat-bb(AT)amsat.org
Message-ID:
<18909860.1214851508223.JavaMail.root(AT)elwamui-
milano.atl.sa.earthlink.net>
Content-Type: text/plain; charset=UTF-8
>>...significant de-sensing of my 2 meter downlink from my 70cm uplink...
Just so we're all on the same page, could you please be a little more specific
with your symptoms? And briefly describe your station?
Clint Bradford, K6LCS
--------------------------------------
Clint Bradford, K6LCS / KAF3359
909-241-7666 - cell
------------------------------
Message: 5
Date: Mon, 30 Jun 2008 14:47:01 -0400 (EDT)
From: Clint Bradford <clintbrad4d(AT)earthlink.net>
Subject: [amsat-bb] Estimating Distance
To: amsat-bb(AT)amsat.org, amsat-bb(AT)amsat.org
Message-ID:
<28632491.1214851621876.JavaMail.root(AT)elwamui-
milano.atl.sa.earthlink.net>
Content-Type: text/plain; charset=UTF-8
>From this morning's email...any ideas?
Hey Clint,
VE4WMK/handheld called ME last night during a 32-degree pass! I was
flabbergasted. We made the contact, and the QSL is on its way to Winnipeg. I
am soooo hooked!!!!!\
Do you know of a formula I can use to get a "ballpark" estimate of the
distance my signal travelled to AO-51? When we made the contact, the satellite
was no more than 20 degrees, at a heading of about 320 degrees. I was simply
amazed to make that contact, given those numbers, from handheld to handheld. I
know my coordinates, and I'm sure I can find AO-51's orbital data from the
AMSAT site. I'm just wondering if there is a way to get some kind of estimate
on that line-of-sight distance.
Any thoughts?
73,
Tim
--------------------------------------
Clint Bradford, K6LCS / KAF3359
909-241-7666 - cell
------------------------------
Message: 6
Date: Mon, 30 Jun 2008 18:51:48 +0000
From: rnutter(AT)networkref.com
Subject: [amsat-bb] Re: Eliminating Desensing
To: "Simon Brown \(HB9DRV\)" <simon(AT)hb9drv.ch>, "AMSAT"
<amsat-bb(AT)amsat.org>
Message-ID:
<278796755-1214851800-cardhu_decombobulator_blackberry.rim.net-
1513830577-(AT)bxe011.bisx.prod.on.blackberry>
Content-Type: text/plain; charset="Windows-1252"
Check my website www.ka4kyi.com and look sat gear, misc equip for this info.
Ron
KA4KYI
------Original Message------
From: Simon Brown \(HB9DRV\)
Sender: amsat-bb-bounces(AT)amsat.org
To: AMSAT
ReplyTo: Simon Brown \(HB9DRV\)
Sent: Jun 30, 2008 1:06 PM
Subject: [amsat-bb] Re: Eliminating Desensing
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-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Sent from my BlackBerry? wireless device
------------------------------
Message: 7
Date: Mon, 30 Jun 2008 20:55:13 +0200
From: "Simon Brown \(HB9DRV\)" <simon(AT)hb9drv.ch>
Subject: [amsat-bb] Re: Eliminating Desensing
To: "AMSAT" <amsat-bb(AT)amsat.org>
Message-ID: <1A752EBE5D244F868B105A6AC81865C6(AT)doubletrouble>
Content-Type: text/plain; format=flowed; charset="Windows-1252";
reply-type=original
Thanks, fine advice there.
Simon Brown, HB9DRV
--------------------------------------------------
From: <rnutter(AT)networkref.com>
> Check my website www.ka4kyi.com and look sat gear, misc equip for this
> info.
------------------------------
Message: 8
Date: Mon, 30 Jun 2008 14:57:56 -0400 (GMT-04:00)
From: Andrew Glasbrenner <glasbrenner(AT)mindspring.com>
Subject: [amsat-bb] Re: Estimating Distance
To: Clint Bradford <clintbrad4d(AT)earthlink.net>, amsat-bb(AT)amsat.org
Message-ID:
<32469138.1214852277523.JavaMail.root(AT)elwamui-
rustique.atl.sa.earthlink.net>
Content-Type: text/plain; charset=UTF-8
In SatPC32, go to the tracking tab, then preview. Enter the QSO time, and look
at the range entry across the bottom. Do the same for the other stations QTH,
and add them together for the round trip distance.
73, Drew KO4MA
-----Original Message-----
>From: Clint Bradford <clintbrad4d(AT)earthlink.net>
>Sent: Jun 30, 2008 2:47 PM
>To: amsat-bb(AT)amsat.org, amsat-bb(AT)amsat.org
>Subject: [amsat-bb] Estimating Distance
>
>>From this morning's email...any ideas?
>
>Hey Clint,
>
>VE4WMK/handheld called ME last night during a 32-degree pass! I was
flabbergasted. We made the contact, and the QSL is on its way to Winnipeg. I
am soooo hooked!!!!!\
>
>Do you know of a formula I can use to get a "ballpark" estimate of the
distance my signal travelled to AO-51? When we made the contact, the satellite
was no more than 20 degrees, at a heading of about 320 degrees. I was simply
amazed to make that contact, given those numbers, from handheld to handheld. I
know my coordinates, and I'm sure I can find AO-51's orbital data from the
AMSAT site. I'm just wondering if there is a way to get some kind of estimate
on that line-of-sight distance.
>
>Any thoughts?
>
>73,
>
>Tim
>
>
>--------------------------------------
>Clint Bradford, K6LCS / KAF3359
>909-241-7666 - cell
>_______________________________________________
>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
------------------------------
_______________________________________________
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 325
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