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CX2SA > SATDIG 03.07.08 00:06l 805 Lines 30289 Bytes #999 (0) @ WW
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Today's Topics:
1. Re: Best type of coax to use between preamps and antennas
(Ronald Nutter)
2. Re: Eliminating Desensing (hasan schiers)
3. Re: Best type of coax to use between preamps and antennas
(Alan P. Biddle)
4. Re: Best type of coax to use between preamps and antennas
(hasan schiers)
5. Re: Best type of coax to use ... in ... AMSAT-BB Digest, Vol
3, Issue 326 (HARVEY VORDENBAUM)
6. Commercial Mode L Antenna sources (Ronald Nutter)
7. Re: Best type of coax to use between preamps and antennas (Joe)
8. Re: Commercial Mode L Antenna sources (Ronald Nutter)
9. Re: Commercial Mode L Antenna sources (kc6uqh)
10. Re: Best type of coax to use between preamps and antennas (i8cvs)
11. Re: Commercial Mode L Antenna sources (Alan P. Biddle)
12. Re: Commercial Mode L Antenna sources (Edward Cole)
13. Re: Commercial Mode L Antenna sources (Alan P. Biddle)
14. Re: Best type of coax to use ... in ... AMSAT-BB Digest, Vol
3, Issue 326 (hasan schiers)
----------------------------------------------------------------------
Message: 1
Date: Tue, 01 Jul 2008 18:01:53 -0500
From: Ronald Nutter <rnutter(AT)networkref.com>
Subject: [amsat-bb] Re: Best type of coax to use between preamps and
antennas
To: Jim Danehy <jdanehy(AT)cinci.rr.com>
Cc: amsat-bb(AT)amsat.org
Message-ID: <486AB761.8000503(AT)networkref.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I used the same setup that I have at the house. I did find one piece of
suspect coax once I returned home. According to my 259B, it had a
higher loss for a short run than I would have expected. There were
several transformers in proximity to where we were located that could
have been putting out some noise. The other satellite op could hear the
noise I didnt hear that subsided later in the evening. The preamps were
located within 10-15 feet of the antennas.
I have ordered replacement LRM400 to use in place of the Mini8/U coax
that I was running from the preamps to the antennas. Will see what happens.
Ron
Jim Danehy wrote:
> Ron
>
> Did you diagnose what your problem was ? Water in the coax ? Where is
> your preamp mounted ? If very near (10 feet) the antenna you can use
> RG8. If you feel intimidated by N connectors (many folks are), Henry
> Radio and others sell a two (2) piece N connector that is installed much
> like a PL 259 which you have probably installed many times. Check out
> Henry Radio on Ebay. If you need more info on this email me direct. I
> think they get around $4 a connector. A short run (10 ft) of RG8 at
> 432mhz or 144mhz is not too prohibited, in my opinion. Or you can have
> somebody put together a jumper as you have noted. Self reliance provides
> better quality control in my opinion.
>
> Jim W9VNE
> ----- Original Message ----- From: "Ronald Nutter"
<rnutter(AT)networkref.com>
> To: <amsat-bb(AT)amsat.org>
> Sent: Monday, June 30, 2008 8:49 PM
> Subject: [amsat-bb] Best type of coax to use between preamps and antennas
>
>
>> After problems I had on Field Day in trying to operate the satellites,
>> I am looking to upgrade the coax I use between the preamps and the
>> antennas. I am using 9913FX from the IC-910H and the preamps. I had
>> been using RG Mini 8/U for the connection between the preamps and
>> antennas. Should I also use 9913FX between the preamps and the
>> antennas? The run between the radio and the preamp is 50 ft. The run
>> from the preamp to the antennas is about 10 - 15 ft depending on where
>> I set the antennas up. I am concerned about how flexible the 9913FX
>> would be in terms of the antennas rotating back and forth. I was
>> planning on ordering the cables pre-made from CableXperts since
>> working with N connectors isnt my strong point and dont want to worry
>> about my soldering and having a good connection on both ends of the
>> cable.
>>
>> Any suggestions appreciated.
>>
>> Thanks,
>> Ron
>> KA4KYI
------------------------------
Message: 2
Date: Tue, 01 Jul 2008 18:14:52 -0500
From: hasan schiers <schiers(AT)netins.net>
Subject: [amsat-bb] Re: Eliminating Desensing
To: Andrew Glasbrenner <glasbrenner(AT)mindspring.com>
Cc: "Reicher,James" <JReicher(AT)hrblock.com>, amsat-bb(AT)amsat.org
Message-ID: <486ABA6C.8060900(AT)netins.net>
Content-Type: text/plain; charset="utf-8"
Good diplexers are an excellent solution, Drew. I use them here, and all
problems were eliminated. I put them in front of the preamp (somewhat
compromising the NF), and have found that the NF and gain are still
quite adequate to get the best performance on the birds.
73,
...hasan, N0AN
Andrew Glasbrenner wrote:
> 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: 3
Date: Tue, 1 Jul 2008 18:16:28 -0500
From: "Alan P. Biddle" <APBIDDLE(AT)UNITED.NET>
Subject: [amsat-bb] Re: Best type of coax to use between preamps and
antennas
To: "'Ronald Nutter'" <rnutter(AT)networkref.com>
Cc: amsat-bb(AT)amsat.org
Message-ID: <62F4C1CB1377412A967CEB95FE190299(AT)WA4SCA>
Content-Type: text/plain; charset="us-ascii"
>>I have ordered replacement LRM400
With luck you meant to type LMR-400UF. The standard LMR-400 is reasonably
flexible, but the Ultra Flex is much better for that purpose.
73s,
Alan
WA4SCA
------------------------------
Message: 4
Date: Tue, 01 Jul 2008 18:12:24 -0500
From: hasan schiers <schiers(AT)netins.net>
Subject: [amsat-bb] Re: Best type of coax to use between preamps and
antennas
To: Ronald Nutter <rnutter(AT)networkref.com>
Cc: amsat-bb(AT)amsat.org
Message-ID: <486AB9D8.8090706(AT)netins.net>
Content-Type: text/plain; charset="iso-8859-1"
LMR-400 works very well, and for higher flexibility requirements, you
can use LMR-400 ultra flex.
It's loss is very close to 9913, without some of the 9913 varieties
problems. I replaced all my 9913 with LMR-400 years ago, and all my
water problems went away, never to return.
73,
hasan, N0AN
Ronald Nutter wrote:
> After problems I had on Field Day in trying to operate the satellites, I
> am looking to upgrade the coax I use between the preamps and the
> antennas. I am using 9913FX from the IC-910H and the preamps. I had
> been using RG Mini 8/U for the connection between the preamps and
> antennas. Should I also use 9913FX between the preamps and the
> antennas? The run between the radio and the preamp is 50 ft. The run
> from the preamp to the antennas is about 10 - 15 ft depending on where I
> set the antennas up. I am concerned about how flexible the 9913FX would
> be in terms of the antennas rotating back and forth. I was planning on
> ordering the cables pre-made from CableXperts since working with N
> connectors isnt my strong point and dont want to worry about my
> soldering and having a good connection on both ends of the cable.
>
> Any suggestions appreciated.
>
> Thanks,
> Ron
> KA4KYI
> _______________________________________________
> 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
> ------------------------------------------------------------------------
>
>
> No virus found in this incoming message.
> Checked by AVG.
> Version: 8.0.101 / Virus Database: 270.4.3/1526 - Release Date: 6/30/2008
8:43 AM
>
-------------- next part --------------
No virus found in this outgoing message.
Checked by AVG.
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AM
------------------------------
Message: 5
Date: Tue, 1 Jul 2008 20:25:38 -0500
From: "HARVEY VORDENBAUM" <tower2(AT)stx.rr.com>
Subject: [amsat-bb] Re: Best type of coax to use ... in ... AMSAT-BB
Digest, Vol 3, Issue 326
To: "joe cassano aka jmario" <jmario(AT)fast.net>, <amsat-bb(AT)AMSAT.Org>
Message-ID: <019b01c8dbe2$8be2fd60$0202a8c0(AT)K5HV>
Content-Type: text/plain; charset="iso-8859-1"
Someone mentioned the 2-piece type N connector for 9913 type coax. Does
anyone have the trimming dimensions for those? I had to make up my own and
wonder how good they are.
73, Harvey
K5HV
----- Original Message -----
From: "joe cassano aka jmario" <jmario(AT)fast.net>
To: <amsat-bb(AT)AMSAT.Org>
Sent: Tuesday, July 01, 2008 12:38 PM
Subject: [amsat-bb] Re: Best type of coax to use ... in ... AMSAT-BB Digest,
Vol 3, Issue 326
Installing a classic clamp type N connector like the Amphenol 82-202
(UG-21D/U) on flexible coax with a real copper center conductor
(RG-8,RG-213) is both easier and has a much higher probability of
success than installing the common PL-259. You only have to make one
easily accessible solder connection.
Take a look at
http://www.amphenolrf.com/products/assemblyInstructions/280.pdf to see
what is involved in attaching classic clamp style N connector.
You also might want to read the reviews listed here:
http://www.eham.net/reviews/products/7 before you make any purchase
decisions.
Regards,
JoeC - K3FMA
> ------------------------------
>
> Message: 12
> Date: Mon, 30 Jun 2008 19:49:00 -0500
> From: Ronald Nutter <rnutter(AT)networkref.com>
> Subject: [amsat-bb] Best type of coax to use between preamps and
> antennas
> To: amsat-bb(AT)amsat.org
> Message-ID: <48697EFC.5010100(AT)networkref.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> After problems I had on Field Day in trying to operate the satellites, I
> am looking to upgrade the coax I use between the preamps and the
> antennas. I am using 9913FX from the IC-910H and the preamps. I had
> been using RG Mini 8/U for the connection between the preamps and
> antennas. Should I also use 9913FX between the preamps and the
> antennas? The run between the radio and the preamp is 50 ft. The run
> from the preamp to the antennas is about 10 - 15 ft depending on where I
> set the antennas up. I am concerned about how flexible the 9913FX would
> be in terms of the antennas rotating back and forth. I was planning on
> ordering the cables pre-made from CableXperts since working with N
> connectors isnt my strong point and dont want to worry about my
> soldering and having a good connection on both ends of the cable.
>
> Any suggestions appreciated.
>
> Thanks,
> Ron
> KA4KYI
>
>
_______________________________________________
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: 6
Date: Tue, 01 Jul 2008 20:41:45 -0500
From: Ronald Nutter <rnutter(AT)networkref.com>
Subject: [amsat-bb] Commercial Mode L Antenna sources
To: amsat-bb(AT)amsat.org
Message-ID: <486ADCD9.7080209(AT)networkref.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I am thinking about putting in a 1.2 Ghz module in m IC910H. That has
me looking at Mode L antennas. Until my browser blew up a few weeks
ago, I had severa links to antenna candidates but have lost those now.
Would appreciate any links to antennas that are usable with AO-51 and
maybe the phase 3 birds when they launch.
Thanks,
Ron
KA4KYI
------------------------------
Message: 7
Date: Tue, 01 Jul 2008 19:56:36 -0500
From: Joe <nss(AT)mwt.net>
Subject: [amsat-bb] Re: Best type of coax to use between preamps and
antennas
To: hasan schiers <schiers(AT)netins.net>
Cc: amsat-bb(AT)amsat.org
Message-ID: <486AD244.7000006(AT)mwt.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Thing is with that short of a run,
any of the smaller coaxes will work just fine and he'd never know the
difference 10 to 15 feet anything will work!
hasan schiers wrote:
> LMR-400 works very well, and for higher flexibility requirements, you
> can use LMR-400 ultra flex.
> It's loss is very close to 9913, without some of the 9913 varieties
> problems. I replaced all my 9913 with LMR-400 years ago, and all my
> water problems went away, never to return.
>
> 73,
>
> hasan, N0AN
>
> Ronald Nutter wrote:
>
>> After problems I had on Field Day in trying to operate the
>> satellites, I am looking to upgrade the coax I use between the
>> preamps and the antennas. I am using 9913FX from the IC-910H and the
>> preamps. I had been using RG Mini 8/U for the connection between the
>> preamps and antennas. Should I also use 9913FX between the preamps
>> and the antennas? The run between the radio and the preamp is 50
>> ft. The run from the preamp to the antennas is about 10 - 15 ft
>> depending on where I set the antennas up. I am concerned about how
>> flexible the 9913FX would be in terms of the antennas rotating back
>> and forth. I was planning on ordering the cables pre-made from
>> CableXperts since working with N connectors isnt my strong point and
>> dont want to worry about my soldering and having a good connection on
>> both ends of the cable.
>>
>> Any suggestions appreciated.
>>
>> Thanks,
>> Ron
>> KA4KYI
>> _______________________________________________
>> 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
>> ------------------------------------------------------------------------
>>
>>
>> No virus found in this incoming message.
>> Checked by AVG. Version: 8.0.101 / Virus Database: 270.4.3/1526 -
>> Release Date: 6/30/2008 8:43 AM
>
------------------------------
Message: 8
Date: Tue, 01 Jul 2008 22:15:52 -0500
From: Ronald Nutter <rnutter(AT)networkref.com>
Subject: [amsat-bb] Re: Commercial Mode L Antenna sources
To: k0vty(AT)juno.com, amsat-bb <amsat-bb(AT)amsat.org>
Message-ID: <486AF2E8.6050108(AT)networkref.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I understand the budget differences. I am looking for options since my
antenna building skills arent that great. I will settle for LEO options
at this point since there are no HEO's up at this point
Ron
KA4KYI
AMSAT #1460
k0vty(AT)juno.com wrote:
> Ron
>
> I suggest there is a large difference between the two bird you quoted
> ( LEO and HEO )
> A link budget study would provide the difference I speak of.
>
> Very best
>
> Joe K0VTY
> Amsat # 860
> ===============
> On Tue, 01 Jul 2008 20:41:45 -0500 Ronald Nutter <rnutter(AT)networkref.com>
> writes:
>> I am thinking about putting in a 1.2 Ghz module in m IC910H. That
>> has
>> me looking at Mode L antennas. Until my browser blew up a few weeks
>>
>> ago, I had severa links to antenna candidates but have lost those
>> now.
>> Would appreciate any links to antennas that are usable with AO-51
>> and
>> maybe the phase 3 birds when they launch.
>>
>> Thanks,
>> Ron
>> KA4KYI
>> _______________________________________________
>> 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
>>
>>
> ____________________________________________________________
> Hotel pics, info and virtual tours. Click here to book a hotel online.
>
http://thirdpartyoffers.juno.com/TGL2141/fc/Ioyw6i3nLmKwW3WK8At0FXUo7Z26P0mhhx
OF9b2Xv7xGxsAjpB6mpk/
------------------------------
Message: 9
Date: Tue, 1 Jul 2008 22:06:48 -0700
From: "kc6uqh" <kc6uqh(AT)cox.net>
Subject: [amsat-bb] Re: Commercial Mode L Antenna sources
To: "Ronald Nutter" <rnutter(AT)networkref.com>, <amsat-bb(AT)amsat.org>
Message-ID: <000a01c8dc01$6e7a5c90$0200a8c0(AT)kc6uqh>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Ron,
I have made a quad loop and installed it just in front of the 2.4 GHz feed
in a Grill type dish. It has about 18 dBi at 1.2 GHz. ( dish rated for 24
dBi (AT) 2.4 GHz) I have used this combination for ATV in So California aera
for several years and no reason why it won't work for AO-51. Good
encouragement for LS mode on a single antenna!
Art,
KC6UQH
----- Original Message -----
From: "Ronald Nutter" <rnutter(AT)networkref.com>
To: <amsat-bb(AT)amsat.org>
Sent: Tuesday, July 01, 2008 6:41 PM
Subject: [amsat-bb] Commercial Mode L Antenna sources
>I am thinking about putting in a 1.2 Ghz module in m IC910H. That has
> me looking at Mode L antennas. Until my browser blew up a few weeks
> ago, I had severa links to antenna candidates but have lost those now.
> Would appreciate any links to antennas that are usable with AO-51 and
> maybe the phase 3 birds when they launch.
>
> Thanks,
> Ron
> KA4KYI
> _______________________________________________
> 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: 10
Date: Wed, 2 Jul 2008 09:44:39 +0200
From: "i8cvs" <domenico.i8cvs(AT)tin.it>
Subject: [amsat-bb] Re: Best type of coax to use between preamps and
antennas
To: "Ronald Nutter" <rnutter(AT)networkref.com>, "AMSAT-BB"
<amsat-bb(AT)amsat.org>
Message-ID: <001901c8dc17$7ca36260$0201a8c0(AT)tin.it>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Ronald Nutter" <rnutter(AT)networkref.com>
To: <amsat-bb(AT)AMSAT.Org>
Sent: Tuesday, July 01, 2008 2:49 AM
Subject: [amsat-bb] Best type of coax to use between preamps and antennas
> After problems I had on Field Day in trying to operate the satellites, I
> am looking to upgrade the coax I use between the preamps and the
> antennas. I am using 9913FX from the IC-910H and the preamps. I had
> been using RG Mini 8/U for the connection between the preamps and
> antennas. Should I also use 9913FX between the preamps and the
> antennas? The run between the radio and the preamp is 50 ft.The run
> from the preamp to the antennas is about 10 - 15 ft depending on where I
> set the antennas up. I am concerned about how flexible the 9913FX would
> be in terms of the antennas rotating back and forth. I was planning on
> ordering the cables pre-made from CableXperts since working with N
> connectors isnt my strong point and dont want to worry about my
> soldering and having a good connection on both ends of the cable.
>
> Any suggestions appreciated.
>
> Thanks,
> Ron
> KA4KYI
Hi Ron, KA4KYI
Any loss introduced by the coax cable between the antenna and the
preamplifier add directly to the noise figure NF of your preamplier alone.
Example:
Preamplifier noise figure NF= 0.5 dB
Attenuation of coax cable + both connectors = 1 dB
In this condition the overall noise figure of your preamplifier becames
1.5 dB i.e. like to have a bad preamplifier with NF= 1.5 dB directly
connected to the antenna connector without any cable.
What is the attenuation in dB of 10 to 15 ft of RG Mini 8/U including
connectors ? Make your calculations by your self and add it to the specified
noise figure of your preamplifier.
By the way the attenuation of the coax cable between the output of your
preamplifier and the input of your IC-910H do not degrades significantly
the overall noise figure of your receiving system because in general the
gain of a good preamplifier is in the order of G= 20 dB wich is enought to
compensate for the losses intoduced by 50 ft of 9913FX
More important the attenuation introduced by 50 ft of 9913FX reduces
directly the power generated by your TX and reaching the antenna.
Example:
In general if the attenuation of the coax cable between TX and antenna is
3 dB and your TX is 100 watt then the power at the antenna connector
will be only 50 watt and this is no good.
By the way if the gain of your preamplifier is 20 dB and the attenuation
betwen preamplifier output and RX input is 3 dB then instead to have a
preamplifier with G=20 dB it is like to have a preamplifier with G= 17 dB
but only from the receiving point of view this is not too bad because it
do not make a significant degradation of the overall noise figure of your
receiving system.
For more information about the above matter read the following article:
"Receiver Noise Figure Sensitivity and Dynamic Range. What the numbar
mean" by James R.Fisk, W1DTY Ham Radio Magazine october 1975
If you cannot find the above super article I have it scanned and I can send
a file to everybody is interested.
73" de
i8CVS Domenico
------------------------------
Message: 11
Date: Wed, 2 Jul 2008 07:15:05 -0500
From: "Alan P. Biddle" <APBIDDLE(AT)UNITED.NET>
Subject: [amsat-bb] Re: Commercial Mode L Antenna sources
To: <amsat-bb(AT)amsat.org>
Message-ID: <248335FB309943EF81995EABAADFEB69(AT)WA4SCA>
Content-Type: text/plain; charset="us-ascii"
Ron,
I have an M2 23CM35EZ which works very well with AO-51. Overkill on AO-51,
and probably marginal for P3, though they are easy to stack for gain.
http://www.m2inc.com/products/uhf/23cm/23cm35ez.html
If you want to go with a commercial helix, Directive Systems makes the
DSH23-12. A friend bought one, and in fact got them to make one with a few
more turns in it. It worked well, and is certainly designed to withstand
the elements. http://www.directivesystems.com/new.htm
Alan
WA4SCA
------------------------------
Message: 12
Date: Wed, 02 Jul 2008 06:39:16 -0800
From: Edward Cole <kl7uw(AT)acsalaska.net>
Subject: [amsat-bb] Re: Commercial Mode L Antenna sources
To: APBIDDLE(AT)MAILAPS.ORG, <amsat-bb(AT)amsat.org>
Message-ID: <200807021439.m62EdHoT015199(AT)hermes.acsalaska.net>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 04:15 AM 7/2/2008, Alan P. Biddle wrote:
>Ron,
>
>I have an M2 23CM35EZ which works very well with AO-51. Overkill on AO-51,
>and probably marginal for P3, though they are easy to stack for gain.
>http://www.m2inc.com/products/uhf/23cm/23cm35ez.html
>
>If you want to go with a commercial helix, Directive Systems makes the
>DSH23-12. A friend bought one, and in fact got them to make one with a few
>more turns in it. It worked well, and is certainly designed to withstand
>the elements. http://www.directivesystems.com/new.htm
>
>Alan
>WA4SCA
Alan,
Dale, KL7XJ uses one of the Directive Systems Helix antennas for
Mode-LU on AO-51 driving with his IC-910H 1.2 GHz module and this
works well for him. Hopefully he can fill you in with details. He
brought his portable trailer-mounted az-el satellite array to FD but
had failure in his Sat AZ-EL controller power supply (24vac) which
prohibited antenna movement. He is using a Gulf-Alpha VHF/UHF yagi
designed for satellite operation. with the Helix.
The 35EZ antennas was used by a few folks on AO-40 Mode-LS, but
either they stacked them or ran more power. I would guess you might
want at least a 2x array and 20w for P3E (but no link analysis has
been published to my knowledge).
*****************************************************
73, Ed - KL7UW BP40iq, 6m - 3cm
144-EME: FT-847, mgf-1801, 4x-xp20, 185w
http://www.kl7uw.com AK VHF-Up Group
NA Rep. for DUBUS: dubususa(AT)hotmail.com
*****************************************************
------------------------------
Message: 13
Date: Wed, 2 Jul 2008 10:52:54 -0500
From: "Alan P. Biddle" <APBIDDLE(AT)UNITED.NET>
Subject: [amsat-bb] Re: Commercial Mode L Antenna sources
To: <amsat-bb(AT)AMSAT.Org>
Message-ID: <8DF5D9CEEDA64410BB93A863AF377719(AT)WA4SCA>
Content-Type: text/plain; charset="us-ascii"
Ed,
Thanks for the info. I can put ~75-80 watts to the antenna, so when we get
another HEO, I will have a shot at it. The "extended" helix my friend got
is about 15.5 dbi CP gain. The M2 is rated at 18.4 dbd (20.5dbi) linear.
So when you put all the conversions in to get it to apples to apples, you
can eat the 3 db CP to linear mismatch and the M2 is still ahead a couple of
db.
I have worked mode-L on all the past and current birds with different
antennas and amps, so it will be interesting to see what the future holds.
73s,
Alan
WA4SCA
------------------------------
Message: 14
Date: Wed, 02 Jul 2008 11:45:36 -0500
From: hasan schiers <schiers(AT)netins.net>
Subject: [amsat-bb] Re: Best type of coax to use ... in ... AMSAT-BB
Digest, Vol 3, Issue 326
To: HARVEY VORDENBAUM <tower2(AT)stx.rr.com>
Cc: joe cassano aka jmario <jmario(AT)fast.net>, amsat-bb(AT)amsat.org
Message-ID: <486BB0B0.9020803(AT)netins.net>
Content-Type: text/plain; charset="iso-8859-1"
I use them all the time, and have not had to use "trimming dimensions".
It is very easy to see where to trim with these two piece connectors,
just put the cable end near the connector and it's pretty obvious where
to cut things (much like a PL-259). I have found them to be very
acceptable N connectors and have done dozens of them without a trimming
chart.
...hasan, N0AN
HARVEY VORDENBAUM wrote:
> Someone mentioned the 2-piece type N connector for 9913 type coax. Does
> anyone have the trimming dimensions for those? I had to make up my own and
> wonder how good they are.
> 73, Harvey
> K5HV
>
> ----- Original Message -----
> From: "joe cassano aka jmario" <jmario(AT)fast.net>
> To: <amsat-bb(AT)AMSAT.Org>
> Sent: Tuesday, July 01, 2008 12:38 PM
> Subject: [amsat-bb] Re: Best type of coax to use ... in ... AMSAT-BB Digest,
> Vol 3, Issue 326
>
>
> Installing a classic clamp type N connector like the Amphenol 82-202
> (UG-21D/U) on flexible coax with a real copper center conductor
> (RG-8,RG-213) is both easier and has a much higher probability of
> success than installing the common PL-259. You only have to make one
> easily accessible solder connection.
>
> Take a look at
> http://www.amphenolrf.com/products/assemblyInstructions/280.pdf to see
> what is involved in attaching classic clamp style N connector.
>
> You also might want to read the reviews listed here:
> http://www.eham.net/reviews/products/7 before you make any purchase
> decisions.
>
>
> Regards,
> JoeC - K3FMA
>
>
>> ------------------------------
>>
>> Message: 12
>> Date: Mon, 30 Jun 2008 19:49:00 -0500
>> From: Ronald Nutter <rnutter(AT)networkref.com>
>> Subject: [amsat-bb] Best type of coax to use between preamps and
>> antennas
>> To: amsat-bb(AT)amsat.org
>> Message-ID: <48697EFC.5010100(AT)networkref.com>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>
>> After problems I had on Field Day in trying to operate the satellites, I
>> am looking to upgrade the coax I use between the preamps and the
>> antennas. I am using 9913FX from the IC-910H and the preamps. I had
>> been using RG Mini 8/U for the connection between the preamps and
>> antennas. Should I also use 9913FX between the preamps and the
>> antennas? The run between the radio and the preamp is 50 ft. The run
>> from the preamp to the antennas is about 10 - 15 ft depending on where I
>> set the antennas up. I am concerned about how flexible the 9913FX would
>> be in terms of the antennas rotating back and forth. I was planning on
>> ordering the cables pre-made from CableXperts since working with N
>> connectors isnt my strong point and dont want to worry about my
>> soldering and having a good connection on both ends of the cable.
>>
>> Any suggestions appreciated.
>>
>> Thanks,
>> Ron
>> KA4KYI
>>
>>
>>
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------------------------------
_______________________________________________
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!
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End of AMSAT-BB Digest, Vol 3, Issue 328
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