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CX2SA > SATDIG 16.03.16 10:56l 1020 Lines 38311 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. Re: Homebrew Up-Dated Eggbeater Antenna (correction)
(Andrew Glasbrenner)
2. Re: Homebrew Up-Dated Eggbeater Antenna (correction)
(Robert Bruninga)
3. Re: Ceuta & Melilla and Gibraltar this summer (Dani EA4GPZ)
4. Egg beater antenna (Dick Illman)
5. Re: Homebrew Up-Dated Eggbeater Antenna (correction)
(Douglas Phelps)
6. Re: Homebrew Up-Dated Eggbeater Antenna (make 100 ohm line)
(Robert Bruninga)
7. Trouble programming a TS-2000 (Rick Tejera)
8. Re: Homebrew Up-Dated Eggbeater Antenna (Tom?? Urbanec)
9. Eggbeater (on4cjq@xxxxxxx.xxx
----------------------------------------------------------------------
Message: 1
Date: Tue, 15 Mar 2016 16:52:35 -0400
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
To: Joe <nss@xxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Homebrew Up-Dated Eggbeater Antenna
(correction)
Message-ID: <0A606766-A611-4B8E-A6FE-9D0558DE2974@xxxxxxxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
I have a 500' roll. Send me a stamped padded envelope or label for a usps
flat rate box and how many feet you'd like.
In about 10 years of offering I've never had a taker though.
73, Drew KO4MA
Sent from my iPhone
> On Mar 15, 2016, at 4:45 PM, Joe <nss@xxx.xxx> wrote:
>
> Main problem seems to be the 93 ohm coax,,,
>
> anyone got a short piece?
>
> Joe WB9SBD
> Sig
> The Original Rolling Ball Clock
> Idle Tyme
> Idle-Tyme.com
> http://www.idle-tyme.com
>> On 3/15/2016 3:11 PM, Robert Bruninga wrote:
>> Although my comments are true, I had not looked at the "updated" web page:
>> http://wb5rmg.somenet.net/k5oe/Eggbeater_2.html
>>
>> It appears he addressed all those issues and has an eggbeater design that
>> does address those same issues. If that works, then that is the same thing
>> I was talking about and seems to be a good approach. I'd love to see a
>> cookoff between the two antennas. Bob...
>>
>> -----Original Message-----
>> From: Robert Bruninga [mailto:bruninga@xxxx.xxxx
>> Sent: Tuesday, March 15, 2016 1:32 PM
>> Subject: RE: [amsat-bb] Homebrew Up-Dated Eggbeater Antenna
>>
>> My 2 cents:
>>
>> The problem with Eggbeaters is that their design goal (omni coverage)
sounds
>> good but also means, by definition, equally poor in all directions.
>> There is no such thing as "gain" for an omni. The closer its gain
>> approaches 3D omni, in all directions, then the closer its gain approaches
>> 0 dBi. Of course, placed over a ground plane, then they can achieve 3
>> dBi...
>>
>> Now, on the other hand, satellites are nowhere near omni located. They are
>> 10dB or more farther away on the horizon than when they are overhead.
>> So you don't need as much gain at all overhead as you need on the horizon.
>>
>> Further, satellites spend more than 70% of all pass times below 22 degrees!
>> (where they are weak) and only 5% of their time above 45 degrees where they
>> are 10 dB stronger.
------------------------------
Message: 2
Date: Tue, 15 Mar 2016 17:43:56 -0400
From: Robert Bruninga <bruninga@xxxx.xxx>
To: Bill Attwood <whattwood@xxxxx.xxx>, amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Homebrew Up-Dated Eggbeater Antenna
(correction)
Message-ID: <7493548118f5d6051a92c987a2af85a8@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Good question. I guess I am glossing over some things... With APRS
SatGates polarization mismatch does not really matter that much since we
have lots of satgates listening. With them, we want a strong packet when
we hear them to decode, but if the polarity mismatches, then another
satgage somewhere else has a good chance of hearing it. So we are not
trying to get all packets, but the ones we do get at each individual
station, the stronger the better.
Hence we focus on gain above the horizon and using the simplest fixed
antenna so more people will do it.
-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces@xxxxx.xxxx On Behalf Of Bill
Attwood
Subject: Re: [amsat-bb] Homebrew Up-Dated Eggbeater Antenna (correction)
Bob, I understand you feel strongly (for good reason) about using a
vertical for satellite purposes. However, do some of these other antenna
designs do a better job of dealing with polarity mismatch than a vertical
would? I ask because I simply don't know.
Thanks,
Bill
VE6WK
On 2016-03-15 2:11 PM, Robert Bruninga wrote:
> Although my comments are true, I had not looked at the "updated" web
page:
> http://wb5rmg.somenet.net/k5oe/Eggbeater_2.html
>
> It appears he addressed all those issues and has an eggbeater design
> that does address those same issues. If that works, then that is the
> same thing I was talking about and seems to be a good approach. I'd
> love to see a cookoff between the two antennas. Bob...
>
> -----Original Message-----
> From: Robert Bruninga [mailto:bruninga@xxxx.xxxx
> Sent: Tuesday, March 15, 2016 1:32 PM
> Subject: RE: [amsat-bb] Homebrew Up-Dated Eggbeater Antenna
>
> My 2 cents:
>
> The problem with Eggbeaters is that their design goal (omni coverage)
> sounds good but also means, by definition, equally poor in all
directions.
> There is no such thing as "gain" for an omni. The closer its gain
> approaches 3D omni, in all directions, then the closer its gain
> approaches
> 0 dBi. Of course, placed over a ground plane, then they can achieve 3
> dBi...
>
> Now, on the other hand, satellites are nowhere near omni located.
> They are 10dB or more farther away on the horizon than when they are
overhead.
> So you don't need as much gain at all overhead as you need on the
horizon.
>
> Further, satellites spend more than 70% of all pass times below 22
degrees!
> (where they are weak) and only 5% of their time above 45 degrees where
> they are 10 dB stronger.
>
> The last thing then that you need for "omni" coverage for a
> non-pointing antenna, then, is gain that is UP (where the satellite is
> 10 times stronger).
>
> See the scale drawings of a LEO pass:
> http://aprs.org/LEO-tracking.html
>
> BUT on the other hand, most cubesats simply do not have the power to
> close the link to an OMNI antenna when it is on the horizon. It just
> cannot happen due to the distance and the omni only being at best 3 dB
gain.
>
> So the BEST "omni" in my opinion is a 19" whip over a large metal
> ground plane. Not only does it provide 5 dBi gain above 15 degrees or
> so on VHF, it also provides almost 7 dBi gain on UHF above about 30
> degrees where it acts as a 3/4 wave vertical..
>
> Yes, it has a null overhead, but the satellite is 10 times stronger
then.
> And the satleilte is only in that null less than 2% of all pass times.
>
> So the 19" vertical gives good gain from above the horizon in all
> directions and sacrificaes some gain overhead wehre it is not needed.
> And no omni antenna is going to hear these weak satellites all the
> way down on the horizon where they are 10 times weaker.
>
> And a 19.25" vertical piece of wire over some chicken wire is pretty
> easy to construct, AND it does not need to be on the top of a tower,
> since it cannot hear to the horizon anyway. So jjust put it where it
> can see most of the sky above abouit 15 degrees and you will hear about
all you can on an Omni.
> And it is not bad...
>
> The value of a true circular hemispherical antenna is only when the
> satelile is strong (ISS) and it can be heard even on the horizon.
> Then the circula hemispherical antenna has the advantage of fewer
> nulls in its pattern. But you give up gain where it is most needed to
get that.
>
> And a low noise preamp is essential...
>
> Just my 2 cents...
> Bob, WB4APR
>
> -----Original Message-----
> From: AMSAT-BB [mailto:amsat-bb-bounces@xxxxx.xxxx On Behalf Of Paul
> Stoetzer
> Sent: Tuesday, March 15, 2016 1:12 PM
> To: jim@xxxxx.xxx
> Cc: amsat-bb@xxxxx.xxx
> Subject: Re: [amsat-bb] Homebrew Up-Dated Eggbeater Antenna
>
> Jim,
>
> The key words here are "noise floor." Omnidirectional antennas can
> work for satellites when you have a low noise floor and short runs of
> very good coax (and/or a preamp).
>
> As an example, I've listened for SO-50 a couple of times from here in
> Washington, DC with my Baofeng UV-3R+ and Nagoya NA-774 telescopic
> whip. I can hear the satellite a bit, but still quite nosily, above 45
degrees.
> Back in August, I was in a field in the middle of nowhere and heard it
> very well from 5-7 degrees above the horizon.
>
> Another example is that some people report decent telemetry success
> from
> AO-73 (when in high power mode) using nothing more than 1/4 wave whip.
> I've never been able to decode a single packet with that type of setup
> here in the city.
>
> Most people live somewhere between the two extremes I've presented
> here of "field in the middle of nowhere" and "apartment building in a
> major urban center" so your mileage may vary. Just keep in mind that
> in any receiving system, you are looking for an optimal signal to
> noise ratio. If you have no noise, you don't need much signal and
> omnidirectional antennas might work fine. If you have a ton of noise,
> you are going to need a lot of signal from the satellite, which means a
beam with decent gain.
>
> 73,
>
> Paul, N8HM
>
> On Tue, Mar 15, 2016 at 12:46 PM, Jim Walls <jim@xxxxx.xxx> wrote:
>> I built one about a decade or so ago and was grossly underwhelmed
>> with
> it.
>> I built it to use for a sat igate. I was able to decode maybe one or
>> two packets per day. Everything else was lost in the noise floor..
>> Only had about 20 feet of RG-214 cable to the receiver.
>>
>> Jim - K6CCC
>>
>>
>>
>>
>>
>> ----------------------------------------
>> From: "Joe" <nss@xxx.xxx>
>> Sent: Tuesday, March 15, 2016 9:37 AM
>> To: "amsat-bb@xxxxx org" <amsat-bb@xxxxx.xxx>
>> Subject: [amsat-bb] Homebrew Up-Dated Eggbeater Antenna Has anyone
>> built this antenna, and what are your opinions? Meet all the claims
>> being made?
>>
>> http://wb5rmg.somenet.net/k5oe/Eggbeater_2.html
>>
>> Joe WB9SBD
>> --
>> Sig
>> The Original Rolling Ball Clock
>> Idle Tyme
>> Idle-Tyme.com
>> http://www.idle-tyme.com
>> _______________________________________________
>> 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://www.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://www.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://www.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://www.amsat.org/mailman/listinfo/amsat-bb
---
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_______________________________________________
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://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 3
Date: Tue, 15 Mar 2016 23:00:44 +0100
From: Dani EA4GPZ <daniel@xxxxxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Ceuta & Melilla and Gibraltar this summer
Message-ID: <56E8860C.7030809@xxxxxxxx.xxx>
Content-Type: text/plain; charset=utf-8
El 15/03/16 a las 19:28, F?lix P?ez escribi?:
>
>
> Hi David,
>
> Thanks for the advice? I have just send them an email to be sure If I need
an authorization?
>
> I need to know too If I need something for Ceuta, but I don?t think so?
Dear Felix,
In Ceuta you can just use your Spanish licence. There is no need for any
additional paperwork and there are no special restrictions. From an
administrative viewpoint, you can use the call EA9/EA4GQS or just EA4GQS
while operating from there. Beware if you decide to use just EA4GQS, as
people may not be able to claim the EA9 DXCC (I'm not sure on what are
the conditions for DXCC).
Regards,
Dani EA4GPZ.
------------------------------
Message: 4
Date: Tue, 15 Mar 2016 17:13:41 -0700
From: Dick Illman <ah6ez01@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Egg beater antenna
Message-ID:
<CAJo5eUY=vei4J11oZp-xWdi11bBR4iF60_GQvjRksYQDA2DcRA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
I have successfully used UHF and VHF Egg Beaters in my attic for years. I
used a TS2000 and ARR transceiver preamps (TS2000 is pretty deaf). I had
100 feet of 9913 cable.
73 Dick Illman
AH6EZ/W7
------------------------------
Message: 5
Date: Wed, 16 Mar 2016 00:33:17 +0000 (UTC)
From: Douglas Phelps <dphelps1@xxxxxxxxx.xxx>
To: Joe <nss@xxx.xxx>, "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Homebrew Up-Dated Eggbeater Antenna
(correction)
Message-ID:
<1282975968.714100.1458088397841.JavaMail.yahoo@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
This may not be a lot of help but you want RG-62. ?You can buy it by the
foot but I do not have any, ?I used mine up working on the WRAPS rotor.
?RG-62 uses an RG-59 connector.
DougK9DLP
From: Joe <nss@xxx.xxx>
To: amsat-bb@xxxxx.xxx
Sent: Tuesday, March 15, 2016 3:45 PM
Subject: Re: [amsat-bb] Homebrew Up-Dated Eggbeater Antenna (correction)
Main problem seems to be the 93 ohm coax,,,
anyone got a short piece?
Joe WB9SBD
Sig
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
On 3/15/2016 3:11 PM, Robert Bruninga wrote:
> Although my comments are true, I had not looked at the "updated" web page:
> http://wb5rmg.somenet.net/k5oe/Eggbeater_2.html
>
> It appears he addressed all those issues and has an eggbeater design that
> does address those same issues.? If that works, then that is the same thing
> I was talking about and seems to be a good approach.? I'd love to see a
> cookoff between the two antennas.? Bob...
>
> -----Original Message-----
> From: Robert Bruninga [mailto:bruninga@xxxx.xxxx
> Sent: Tuesday, March 15, 2016 1:32 PM
> Subject: RE: [amsat-bb] Homebrew Up-Dated Eggbeater Antenna
>
> My 2 cents:
>
> The problem with Eggbeaters is that their design goal (omni coverage) sounds
> good but also means, by definition, equally poor in all directions.
> There is no such thing as "gain" for an omni.? The closer its gain
> approaches 3D omni, in all directions, then the closer its gain approaches
> 0 dBi.? Of course, placed over a ground plane, then they can achieve 3
> dBi...
>
> Now, on the other hand, satellites are nowhere near omni located.? They are
> 10dB or more farther away on the horizon than when they are overhead.
> So you don't need as much gain at all overhead as you need on the horizon.
>
> Further, satellites spend more than 70% of all pass times below 22 degrees!
> (where they are weak) and only 5% of their time above 45 degrees where they
> are 10 dB stronger.
>
> The last thing then that you need for "omni" coverage for a non-pointing
> antenna, then, is gain that is UP (where the satellite is 10 times
> stronger).
>
> See the scale drawings of a LEO pass: http://aprs.org/LEO-tracking.html
>
> BUT on the other hand, most cubesats simply do not have the power to close
> the link to an OMNI antenna when it is on the horizon.? It just cannot
> happen due to the distance and the omni only being at best 3 dB gain.
>
> So the BEST "omni" in my opinion is a 19" whip over a large metal ground
> plane.? Not only does it provide 5 dBi gain above 15 degrees or so on VHF,
> it also provides almost 7 dBi gain on UHF above about 30 degrees where it
> acts as a 3/4 wave vertical..
>
> Yes, it has a null overhead, but the satellite is 10 times stronger then.
> And the satleilte is only in that null less than 2% of all pass times.
>
> So the 19" vertical gives good gain from above the horizon in all directions
> and sacrificaes some gain overhead wehre it is not needed.? And no omni
> antenna is going to? hear these weak satellites all the way down on the
> horizon where they are 10 times weaker.
>
> And a 19.25" vertical piece of wire over some chicken wire is pretty easy to
> construct, AND it does not need to be on the top of a tower, since it cannot
> hear to the horizon anyway.? So jjust put it where it can see most of the
> sky above abouit 15 degrees and you will hear about all you can on an Omni.
> And it is not bad...
>
> The value of a true circular hemispherical antenna is only when the satelile
> is strong (ISS) and it can be heard even on the horizon.? Then the circula
> hemispherical antenna has the advantage of fewer nulls in its pattern.? But
> you give up gain where it is most needed to get that.
>
> And a low noise preamp is essential...
>
> Just my 2 cents...
> Bob, WB4APR
>
> -----Original Message-----
> From: AMSAT-BB [mailto:amsat-bb-bounces@xxxxx.xxxx On Behalf Of Paul
> Stoetzer
> Sent: Tuesday, March 15, 2016 1:12 PM
> To: jim@xxxxx.xxx
> Cc: amsat-bb@xxxxx.xxx
> Subject: Re: [amsat-bb] Homebrew Up-Dated Eggbeater Antenna
>
> Jim,
>
> The key words here are "noise floor." Omnidirectional antennas can work for
> satellites when you have a low noise floor and short runs of very good coax
> (and/or a preamp).
>
> As an example, I've listened for SO-50 a couple of times from here in
> Washington, DC with my Baofeng UV-3R+ and Nagoya NA-774 telescopic whip. I
> can hear the satellite a bit, but still quite nosily, above 45 degrees.
> Back in August, I was in a field in the middle of nowhere and heard it very
> well from 5-7 degrees above the horizon.
>
> Another example is that some people report decent telemetry success from
> AO-73 (when in high power mode) using nothing more than 1/4 wave whip.
> I've never been able to decode a single packet with that type of setup here
> in the city.
>
> Most people live somewhere between the two extremes I've presented here of
> "field in the middle of nowhere" and "apartment building in a major urban
> center" so your mileage may vary. Just keep in mind that in any receiving
> system, you are looking for an optimal signal to noise ratio. If you have no
> noise, you don't need much signal and omnidirectional antennas might work
> fine. If you have a ton of noise, you are going to need a lot of signal from
> the satellite, which means a beam with decent gain.
>
> 73,
>
> Paul, N8HM
>
> On Tue, Mar 15, 2016 at 12:46 PM, Jim Walls <jim@xxxxx.xxx> wrote:
>> I built one about a decade or so ago and was grossly underwhelmed with
> it.
>> I built it to use for a sat igate.? I was able to decode maybe one or
>> two packets per day.? Everything else was lost in the noise floor..
>> Only had about 20 feet of RG-214 cable to the receiver.
>>
>>? Jim - K6CCC
>>
>>
>>
>>
>>
>> ----------------------------------------
>>? From: "Joe" <nss@xxx.xxx>
>> Sent: Tuesday, March 15, 2016 9:37 AM
>> To: "amsat-bb@xxxxx org" <amsat-bb@xxxxx.xxx>
>> Subject: [amsat-bb] Homebrew Up-Dated Eggbeater Antenna Has anyone
>> built this antenna, and what are your opinions? Meet all the claims
>> being made?
>>
>> http://wb5rmg.somenet.net/k5oe/Eggbeater_2.html
>>
>> Joe WB9SBD
>> --
>> Sig
>> The Original Rolling Ball Clock
>> Idle Tyme
>> Idle-Tyme.com
>> http://www.idle-tyme.com
>> _______________________________________________
>> 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://www.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://www.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://www.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://www.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://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 6
Date: Tue, 15 Mar 2016 22:08:18 -0400
From: Robert Bruninga <bruninga@xxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Homebrew Up-Dated Eggbeater Antenna (make 100
ohm line)
Message-ID: <b55d11737e3a857c0713f76ea62c0825@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
> Main problem seems to be the 93 ohm coax,,,
But one only needs 13" of the 100 ohm line at VHF and only 4.5" at UHF so
just make it.
Cut a piece of RG59 say 40% longer than the right length.
Strip off the outer jacket and also slide off the shield.
Now cut the dialectric and center conductor to the right length.
NoW, then slide on enough heatshrink or wrap the dialectric with enough
electrical tape to build up the diameter of the dialectric with something to
bulk up the diameter until you get the right center to outer ratio to be 100
ohms.
Then slide the shield back over it, heat shrink the whole thing, and you
just made yourself a piece of 100 ohm coax, or any other impedance you want.
Have I ever done this? No. But it should work if you can get the expanded
diameter right, and what you stuff it with has a reasonable diaelectric
constant.
At least it would be fun to take the challenge.
Or if you are very lucky, there may be a piece of larger 50 ohm line that if
you could slide out the center conductor and slide in a smaller one of the
right diameter you could do it that way too.
Hey, it?s a hobby... of course you would need a dipper or antenna analyzer
to test it. Just put a 200 ohm resistor on the end and see how close you
get to 1.0 SWR.
The more I think about it the more likely it would be to find some cheap
RG59 that the center conductor slides out of. It has happened to me enough
times when I try to strip some cheap junk that the center conductor pulls
right out of short coax pieces... Then just stuff back in a smaller center
conductor.
Maybe?
Bob, WB4APR
-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces@xxxxx.xxxx On Behalf Of Douglas
Phelps
Sent: Tuesday, March 15, 2016 8:33 PM
To: Joe; amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Homebrew Up-Dated Eggbeater Antenna (correction)
This may not be a lot of help but you want RG-62. You can buy it by the
foot but I do not have any, I used mine up working on the WRAPS rotor.
RG-62 uses an RG-59 connector.
DougK9DLP
From: Joe <nss@xxx.xxx>
To: amsat-bb@xxxxx.xxx
Sent: Tuesday, March 15, 2016 3:45 PM
Subject: Re: [amsat-bb] Homebrew Up-Dated Eggbeater Antenna (correction)
Main problem seems to be the 93 ohm coax,,,
anyone got a short piece?
Joe WB9SBD
Sig
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
On 3/15/2016 3:11 PM, Robert Bruninga wrote:
> Although my comments are true, I had not looked at the "updated" web page:
> http://wb5rmg.somenet.net/k5oe/Eggbeater_2.html
>
> It appears he addressed all those issues and has an eggbeater design
> that does address those same issues. If that works, then that is the
> same thing I was talking about and seems to be a good approach. I'd
> love to see a cookoff between the two antennas. Bob...
>
> -----Original Message-----
> From: Robert Bruninga [mailto:bruninga@xxxx.xxxx
> Sent: Tuesday, March 15, 2016 1:32 PM
> Subject: RE: [amsat-bb] Homebrew Up-Dated Eggbeater Antenna
>
> My 2 cents:
>
> The problem with Eggbeaters is that their design goal (omni coverage)
> sounds good but also means, by definition, equally poor in all directions.
> There is no such thing as "gain" for an omni. The closer its gain
> approaches 3D omni, in all directions, then the closer its gain
> approaches
> 0 dBi. Of course, placed over a ground plane, then they can achieve 3
> dBi...
>
> Now, on the other hand, satellites are nowhere near omni located.
> They are 10dB or more farther away on the horizon than when they are
> overhead.
> So you don't need as much gain at all overhead as you need on the horizon.
>
> Further, satellites spend more than 70% of all pass times below 22
> degrees!
> (where they are weak) and only 5% of their time above 45 degrees where
> they are 10 dB stronger.
>
> The last thing then that you need for "omni" coverage for a
> non-pointing antenna, then, is gain that is UP (where the satellite is
> 10 times stronger).
>
> See the scale drawings of a LEO pass:
> http://aprs.org/LEO-tracking.html
>
> BUT on the other hand, most cubesats simply do not have the power to
> close the link to an OMNI antenna when it is on the horizon. It just
> cannot happen due to the distance and the omni only being at best 3 dB
> gain.
>
> So the BEST "omni" in my opinion is a 19" whip over a large metal
> ground plane. Not only does it provide 5 dBi gain above 15 degrees or
> so on VHF, it also provides almost 7 dBi gain on UHF above about 30
> degrees where it acts as a 3/4 wave vertical..
>
> Yes, it has a null overhead, but the satellite is 10 times stronger then.
> And the satleilte is only in that null less than 2% of all pass times.
>
> So the 19" vertical gives good gain from above the horizon in all
> directions and sacrificaes some gain overhead wehre it is not needed.
> And no omni antenna is going to hear these weak satellites all the
> way down on the horizon where they are 10 times weaker.
>
> And a 19.25" vertical piece of wire over some chicken wire is pretty
> easy to construct, AND it does not need to be on the top of a tower,
> since it cannot hear to the horizon anyway. So jjust put it where it
> can see most of the sky above abouit 15 degrees and you will hear about
> all you can on an Omni.
> And it is not bad...
>
> The value of a true circular hemispherical antenna is only when the
> satelile is strong (ISS) and it can be heard even on the horizon.
> Then the circula hemispherical antenna has the advantage of fewer
> nulls in its pattern. But you give up gain where it is most needed to get
> that.
>
> And a low noise preamp is essential...
>
> Just my 2 cents...
> Bob, WB4APR
>
> -----Original Message-----
> From: AMSAT-BB [mailto:amsat-bb-bounces@xxxxx.xxxx On Behalf Of Paul
> Stoetzer
> Sent: Tuesday, March 15, 2016 1:12 PM
> To: jim@xxxxx.xxx
> Cc: amsat-bb@xxxxx.xxx
> Subject: Re: [amsat-bb] Homebrew Up-Dated Eggbeater Antenna
>
> Jim,
>
> The key words here are "noise floor." Omnidirectional antennas can
> work for satellites when you have a low noise floor and short runs of
> very good coax (and/or a preamp).
>
> As an example, I've listened for SO-50 a couple of times from here in
> Washington, DC with my Baofeng UV-3R+ and Nagoya NA-774 telescopic
> whip. I can hear the satellite a bit, but still quite nosily, above 45
> degrees.
> Back in August, I was in a field in the middle of nowhere and heard it
> very well from 5-7 degrees above the horizon.
>
> Another example is that some people report decent telemetry success
> from
> AO-73 (when in high power mode) using nothing more than 1/4 wave whip.
> I've never been able to decode a single packet with that type of setup
> here in the city.
>
> Most people live somewhere between the two extremes I've presented
> here of "field in the middle of nowhere" and "apartment building in a
> major urban center" so your mileage may vary. Just keep in mind that
> in any receiving system, you are looking for an optimal signal to
> noise ratio. If you have no noise, you don't need much signal and
> omnidirectional antennas might work fine. If you have a ton of noise,
> you are going to need a lot of signal from the satellite, which means a
> beam with decent gain.
>
> 73,
>
> Paul, N8HM
>
> On Tue, Mar 15, 2016 at 12:46 PM, Jim Walls <jim@xxxxx.xxx> wrote:
>> I built one about a decade or so ago and was grossly underwhelmed
>> with
> it.
>> I built it to use for a sat igate. I was able to decode maybe one or
>> two packets per day. Everything else was lost in the noise floor..
>> Only had about 20 feet of RG-214 cable to the receiver.
>>
>> Jim - K6CCC
>>
>>
>>
>>
>>
>> ----------------------------------------
>> From: "Joe" <nss@xxx.xxx>
>> Sent: Tuesday, March 15, 2016 9:37 AM
>> To: "amsat-bb@xxxxx org" <amsat-bb@xxxxx.xxx>
>> Subject: [amsat-bb] Homebrew Up-Dated Eggbeater Antenna Has anyone
>>built this antenna, and what are your opinions? Meet all the claims
>>being made?
>>
>> http://wb5rmg.somenet.net/k5oe/Eggbeater_2.html
>>
>> Joe WB9SBD
>> --
>> Sig
>> The Original Rolling Ball Clock
>> Idle Tyme
>> Idle-Tyme.com
>> http://www.idle-tyme.com
>> _______________________________________________
>> 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://www.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://www.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.
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> the official views of AMSAT-NA.
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> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership.
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> official views of AMSAT-NA.
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>
>
_______________________________________________
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.
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_______________________________________________
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interested persons worldwide without requiring membership. Opinions
expressed are solely those of the author, and do not reflect the official
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------------------------------
Message: 7
Date: Tue, 15 Mar 2016 21:22:46 -0700
From: "Rick Tejera" <saguaroastro@xxx.xxx>
To: "'AMSAT'" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Trouble programming a TS-2000
Message-ID: <012401d17f3b$7e3a19f0$7aae4dd0$@xxx>
Content-Type: text/plain; charset="us-ascii"
All,
Cross posting from the amsat-na fb page:
OK TS-2000 users, I finally have some time and decided to program the sat
memories in my TS-2000. Now according to the manual you put the downlink
into VFO-A and the uplink into VFO-B. Straight forward enough, problem is
when I select VFO-A on the sub receiver to add it, I can't seem to make it
find the 2m band. It goes from 70cm to 6m. I have no idea why it's doing
this. Anyone else have this problem?
Rick Tejera (K7TEJ)
Saguaro Astronomy Club
www.saguaroastro.org
Thunderbird Radio Club
www.w7tbc.org
623-572-0713
623-203-4121 (cell)
SaguaroAstro@xxx.xxx
------------------------------
Message: 8
Date: Wed, 16 Mar 2016 09:27:53 +0100
From: Tom?? Urbanec <tommypnq@xxxxxxx.xx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Homebrew Up-Dated Eggbeater Antenna
Message-ID: <56E91909.8060707@xxxxxxx.xx>
Content-Type: text/plain; charset=windows-1252; format=flowed
I have built this antenna both for VHF and UHF years ago, I am using now
just the UHF version for the NO-83 and NO-84 monitoring. I have mounted
the LNA on mast just below the antenna and in the shack I have splitter
for two SDRs to automatically record every pass. The sats can be seen in
the waterfall from horizon to horizon, for the decoding of beacons I
need some 5-10degs elevation. The crucial point of the setup is low
noise background = I have it deployed at home in small village. I tried
it in the city, but the SDRs AGC where pushed some 20dBs by ISM signals
and there were just overhead traces from the strongest sats.
So do the experiment and you will see.
Tomas OK2PNQ
Dne 15.3.2016 v 19:50 Robert Bruninga napsal(a):
> NO84 is only 300 mW compared to 2W for the original PCSAT and 5W for the
> ISS (currently). You need gain to hear it...
>
> If you want a non-moving fixed antenna to hear NO84, I'd try a 58"
> vertical whip over a large metal ground plane. This would give you up to
> 7 dBi above about 30 degrees. Then you would hear it every day, but only
> for the better passes above 25 degrees. But you would hear it then.
>
> And I modeled it in EZNEC and just a vertical over say 4 radials is not
> the same thing. That helps matching, but does not block the 3db part of
> the pattern into the ground. You need a real "ground plane" of a metal
> roof, or about 6 feet or more of chicken wire.
>
> Easy for me to say, because I have not built one yet...
>
> Bob, WB4APR
>
> -----Original Message-----
>> Bummer! I'm looking for some sort of an Omni ant to use with NO-84
> _______________________________________________
> 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://www.amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 9
Date: Wed, 16 Mar 2016 09:54:10 +0100 (CET)
From: on4cjq@xxxxxxx.xx
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Eggbeater
Message-ID:
<529807923.97448721.1458118450981.JavaMail.root@xxxxxxx.xx>
Content-Type: text/plain; charset=utf-8
Hello
A nice article about eggbeaters. Never build one myself yet.
http://on6wg.pagesperso-orange.fr/Page%201.html
73's
Jerry,ON4CJQ
------------------------------
Subject: Digest Footer
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End of AMSAT-BB Digest, Vol 11, Issue 82
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