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CX2SA > SATDIG 28.03.20 02:15l 657 Lines 25003 Bytes #999 (0) @ WW
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CX2SA
Sent: 200328/0011Z @:CX2SA.SAL.URY.SOAM #:27427 [Salto] FBB7.00e $:AMSATBB1599
From: CX2SA@CX2SA.SAL.URY.SOAM
To : SATDIG@WW
Today's Topics:
1. Be on the lookout for YV stations on the birds (The Romagni's)
2. Trying to get back on the sats... but G-5500 Failure
(Michael Hatzakis Jr MD)
3. Shortening M2 2MCP22? (Rich Gopstein)
4. Re: Trying to get back on the sats... but G-5500 Failure
(Michael Hatzakis Jr MD)
5. Re: Trying to get back on the sats... but G-5500 Failure
(Joseph B. Fitzgerald)
6. Re: Be on the lookout for YV stations on the birds (Burns Fisher)
7. Re: Trying to get back on the sats... but G-5500 Failure
(Burns Fisher)
8. Re: Trying to get back on the sats... but G-5500 Failure
(Hasan al-Basri)
9. Re: Shortening M2 2MCP22? (Hasan al-Basri)
10. Re: Trying to get back on the sats... but G-5500 Failure
(Joseph B. Fitzgerald)
----------------------------------------------------------------------
Message: 1
Date: Fri, 27 Mar 2020 14:48:15 -0500
From: "The Romagni's" <eromagni@?????.???>
To: amsat-bb@?????.???
Subject: [amsat-bb] Be on the lookout for YV stations on the birds
Message-ID:
<CAHyAO8gt1mStjbw7_EtU1PjkrtRbe0yaCbM0USTj7cjabQe1=Q@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Hello all,
I been involved with a project teaching how to get on sats with a group of
hams down in Venezuela - the result has been amazing, and now about 10 to
15 stations are getting on the birds (most of the on the FM birds) - so be
in the look out for some activity from YV Land.
73
Steve
W4DTA / YV5DTA
------------------------------
Message: 2
Date: Fri, 27 Mar 2020 12:52:19 -0700
From: Michael Hatzakis Jr MD <mail@????????.???>
To: amsat-bb@?????.???
Subject: [amsat-bb] Trying to get back on the sats... but G-5500
Failure
Message-ID: <60699AEB-FF72-4019-A871-EC258837C5D7@????????.???>
Content-Type: text/plain; charset=utf-8
Hi guys/gals,
I used to be very active on the Sats, and for years; have a great set-up,
but thanks to life events, went dark for about 5-6 years.
Trying to find a silver lining in this COVID crisis, while my business is in
the tank, thought I would get back to my love of the birds.
Unfortunately, I turned on my G-5500 controller and suddenly find the
elevation portion of the rotor isnt responding. Rotation is fine. Thanks to
my fearless days of my 40?s, the antenna is up on the chimney in a set up
thats a little challenging to service, so I am looking for what I can do on
the ground to try to debug and prepare first, before embarking on a roof
expedition.
What are the common reasons for the elevation rotator to stop responding?
is there much I can do on the ground to debug, and/or prepare when I go up
on the roof to check the rotor out? What are the repair options?
Michael Hatzakis Jr MD K3MH
mail@????????.??? <mailto:mail@????????.???>
------------------------------
Message: 3
Date: Fri, 27 Mar 2020 17:16:28 -0400
From: Rich Gopstein <rich@????????????.???>
To: AMSAT-BB@?????.???
Subject: [amsat-bb] Shortening M2 2MCP22?
Message-ID:
<CANsNeaoAjM=goAnPmxG9LE1+a=td6t9KvcA_Wi-8TqGGMaV-tg@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
I have an old 2mcp22 antenna that I would like to put up, but it's almost
20 feet long... Since I don't need that much gain for the current batch of
satellites, I was wondering if I can use only one boom section and end up
with a shorter 10 (2x5) element antenna.
Would that have any undesirable effects (other than reducing gain and
increasing beam width)?
Thanks.
Rich, KD2CQ
------------------------------
Message: 4
Date: Fri, 27 Mar 2020 14:25:01 -0700
From: Michael Hatzakis Jr MD <mail@????????.???>
To: Gerald Witalec <jplanner@?????????.???>, amsat-bb@?????.???
Subject: Re: [amsat-bb] Trying to get back on the sats... but G-5500
Failure
Message-ID: <AC3FF814-1990-4BE7-AFA0-1BF5C50EC0FC@????????.???>
Content-Type: text/plain; charset=utf-8
Jerry,
Just for perspective. That rotor has been up for 15 years or more. Been
through multiple major storms, snow, ice, etc and has been flawless for that
entire time. This is the first failure in all that time, and more than
likely related to sitting dormant for 6 years. So, I would say, that is
pretty darn good. Can?t speak for others, but I don?t have an issues with
that duration of a failure free period.
Michael Hatzakis Jr MD. K3MH
> On Mar 27, 2020, at 2:21 PM, Gerald Witalec <jplanner@?????????.???> wrote:
>
> Hi Michael,
> Been reading a lot on the AMSAT-BB and amazed about how many of you are
having problems with such an expensive rotor.
> I have decided not to purchase it and going to build my SAT station
instead with servo motors.
>
> Jerry...W8RQM
>
> On Friday, March 27, 2020, 4:58:27 PM EDT, Michael Hatzakis Jr MD via
AMSAT-BB <amsat-bb@?????.???> wrote:
>
>
> Hi guys/gals,
>
> I used to be very active on the Sats, and for years; have a great set-up,
but thanks to life events, went dark for about 5-6 years.
>
> Trying to find a silver lining in this COVID crisis, while my business is
in the tank, thought I would get back to my love of the birds.
>
> Unfortunately, I turned on my G-5500 controller and suddenly find the
elevation portion of the rotor isnt responding. Rotation is fine. Thanks to
my fearless days of my 40?s, the antenna is up on the chimney in a set up
thats a little challenging to service, so I am looking for what I can do on
the ground to try to debug and prepare first, before embarking on a roof
expedition.
>
> What are the common reasons for the elevation rotator to stop responding?
is there much I can do on the ground to debug, and/or prepare when I go up
on the roof to check the rotor out? What are the repair options?
>
> Michael Hatzakis Jr MD K3MH
> mail@????????.??? <mailto:mail@????????.???> <mailto:mail@????????.???
<mailto:mail@????????.???>>
> _______________________________________________
> Sent via AMSAT-BB@?????.???. <mailto:AMSAT-BB@?????.???.> 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: https://www.amsat.org/mailman/listinfo/amsat-bb
<https://www.amsat.org/mailman/listinfo/amsat-bb>
------------------------------
Message: 5
Date: Fri, 27 Mar 2020 22:02:21 +0000
From: "Joseph B. Fitzgerald" <jfitzgerald@????.???.???>
To: Gerald Witalec <jplanner@?????????.???>, "amsat-bb@?????.????
<amsat-bb@?????.???>, Michael Hatzakis Jr MD <mail@????????.???>
Subject: Re: [amsat-bb] Trying to get back on the sats... but G-5500
Failure
Message-ID:
<BLAPR22MB21156379F95B1CD9847A0E2887CC0@?????????????.????????.????.???????.??
?>
Content-Type: text/plain; charset="Windows-1252"
Michael,
We can hope for a broken wire, hopefully close to the ground. Not sure if
there is a real difference this year, but here in new england I have heard
an unusually large number of complaints about critters chewing through
cables. Does the control box make any indication of current flowing when you
try to change the elevation, i.e does the control box hum louder than usual?
I would also be curious to see what the resistance is between pins 4-6 and
pins 5-6 of the , I would expect to see a few ohms.
de KM1P Joe
________________________________________
From: AMSAT-BB <amsat-bb-bounces@?????.???> on behalf of Michael Hatzakis Jr
MD via AMSAT-BB <amsat-bb@?????.???>
Sent: Friday, March 27, 2020 5:25 PM
To: Gerald Witalec; amsat-bb@?????.???
Subject: Re: [amsat-bb] Trying to get back on the sats... but G-5500 Failure
Jerry,
Just for perspective. That rotor has been up for 15 years or more. Been
through multiple major storms, snow, ice, etc and has been flawless for that
entire time. This is the first failure in all that time, and more than
likely related to sitting dormant for 6 years. So, I would say, that is
pretty darn good. Can?t speak for others, but I don?t have an issues with
that duration of a failure free period.
Michael Hatzakis Jr MD. K3MH
> On Mar 27, 2020, at 2:21 PM, Gerald Witalec <jplanner@?????????.???> wrote:
>
> Hi Michael,
> Been reading a lot on the AMSAT-BB and amazed about how many of you are
having problems with such an expensive rotor.
> I have decided not to purchase it and going to build my SAT station
instead with servo motors.
>
> Jerry...W8RQM
>
> On Friday, March 27, 2020, 4:58:27 PM EDT, Michael Hatzakis Jr MD via
AMSAT-BB <amsat-bb@?????.???> wrote:
>
>
> Hi guys/gals,
>
> I used to be very active on the Sats, and for years; have a great set-up,
but thanks to life events, went dark for about 5-6 years.
>
> Trying to find a silver lining in this COVID crisis, while my business is
in the tank, thought I would get back to my love of the birds.
>
> Unfortunately, I turned on my G-5500 controller and suddenly find the
elevation portion of the rotor isnt responding. Rotation is fine. Thanks to
my fearless days of my 40?s, the antenna is up on the chimney in a set up
thats a little challenging to service, so I am looking for what I can do on
the ground to try to debug and prepare first, before embarking on a roof
expedition.
>
> What are the common reasons for the elevation rotator to stop responding?
is there much I can do on the ground to debug, and/or prepare when I go up
on the roof to check the rotor out? What are the repair options?
>
> Michael Hatzakis Jr MD K3MH
> mail@????????.??? <mailto:mail@????????.???> <mailto:mail@????????.???
<mailto:mail@????????.???>>
> _______________________________________________
> Sent via AMSAT-BB@?????.???. <mailto:AMSAT-BB@?????.???.> 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: https://www.amsat.org/mailman/listinfo/amsat-bb
<https://www.amsat.org/mailman/listinfo/amsat-bb>
_______________________________________________
Sent via AMSAT-BB@?????.???. 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: https://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 6
Date: Fri, 27 Mar 2020 18:03:12 -0400
From: Burns Fisher <wb1fj-bb@??????.??>
To: "The Romagni's" <eromagni@?????.???>
Cc: AMSAT BB <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Be on the lookout for YV stations on the birds
Message-ID:
<CABX7KxUGXxOo=4T9uW7z9NfAiY+3KBDwkP_=4Tosj+AA1h7VUw@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Good work, Steve! I know I can get some places in Central America, but I'm
not sure about as far as YV. I'll have to watch the passes carefully!
On Fri, Mar 27, 2020 at 4:04 PM The Romagni's via AMSAT-BB <
amsat-bb@?????.???> wrote:
> Hello all,
>
> I been involved with a project teaching how to get on sats with a group of
> hams down in Venezuela - the result has been amazing, and now about 10 to
> 15 stations are getting on the birds (most of the on the FM birds) - so be
> in the look out for some activity from YV Land.
>
> 73
>
> Steve
> W4DTA / YV5DTA
> _______________________________________________
> Sent via AMSAT-BB@?????.???. 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: https://www.amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 7
Date: Fri, 27 Mar 2020 18:09:09 -0400
From: Burns Fisher <wb1fj-bb@??????.??>
To: Michael Hatzakis Jr MD <mail@????????.???>
Cc: AMSAT BB <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Trying to get back on the sats... but G-5500
Failure
Message-ID:
<CABX7KxXRz=3_mj5ceH8-v7mUP4cxwx8tBkaft1A_hGgWb56Nww@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
So far, my problems with the 5500 have all been with the cables. One time
a mouse chewed through it. Another time I discovered the bolt on my surge
protector terminal was not tight. Not to say the 5500 never has hardware
problems. One thing I'd look at is whether it is literally not rotating
when power is applied, or whether it is the feedback pot/wiring that is
bad. Worth a check so you can trace the wiring better
But one interesting question is what elevation your antenna is frozen at?
You could be successful for a while at either end of the pass if it is
horizontal (depending on the beam width of your antennas). Maybe a bit
more challenging if it is vertical.
On Fri, Mar 27, 2020 at 5:50 PM Michael Hatzakis Jr MD via AMSAT-BB <
amsat-bb@?????.???> wrote:
> Jerry,
>
> Just for perspective. That rotor has been up for 15 years or more. Been
> through multiple major storms, snow, ice, etc and has been flawless for
> that entire time. This is the first failure in all that time, and more
> than likely related to sitting dormant for 6 years. So, I would say, that
> is pretty darn good. Can?t speak for others, but I don?t have an issues
> with that duration of a failure free period.
>
> Michael Hatzakis Jr MD. K3MH
>
>
>
> > On Mar 27, 2020, at 2:21 PM, Gerald Witalec <jplanner@?????????.???>
> wrote:
> >
> > Hi Michael,
> > Been reading a lot on the AMSAT-BB and amazed about how many of you are
> having problems with such an expensive rotor.
> > I have decided not to purchase it and going to build my SAT station
> instead with servo motors.
> >
> > Jerry...W8RQM
> >
> > On Friday, March 27, 2020, 4:58:27 PM EDT, Michael Hatzakis Jr MD via
> AMSAT-BB <amsat-bb@?????.???> wrote:
> >
> >
> > Hi guys/gals,
> >
> > I used to be very active on the Sats, and for years; have a great
> set-up, but thanks to life events, went dark for about 5-6 years.
> >
> > Trying to find a silver lining in this COVID crisis, while my business
> is in the tank, thought I would get back to my love of the birds.
> >
> > Unfortunately, I turned on my G-5500 controller and suddenly find the
> elevation portion of the rotor isnt responding. Rotation is fine. Thanks
> to my fearless days of my 40?s, the antenna is up on the chimney in a set
> up thats a little challenging to service, so I am looking for what I can do
> on the ground to try to debug and prepare first, before embarking on a roof
> expedition.
> >
> > What are the common reasons for the elevation rotator to stop
> responding? is there much I can do on the ground to debug, and/or prepare
> when I go up on the roof to check the rotor out? What are the repair
> options?
> >
> > Michael Hatzakis Jr MD K3MH
> > mail@????????.??? <mailto:mail@????????.???> <mailto:mail@????????.???
> <mailto:mail@????????.???>>
> > _______________________________________________
> > Sent via AMSAT-BB@?????.???. <mailto:AMSAT-BB@?????.???.> 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: https://www.amsat.org/mailman/listinfo/amsat-bb <
> https://www.amsat.org/mailman/listinfo/amsat-bb>
>
> _______________________________________________
> Sent via AMSAT-BB@?????.???. 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: https://www.amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 8
Date: Fri, 27 Mar 2020 18:23:39 -0500
From: Hasan al-Basri <hbasri.schiers6@?????.???>
To: Burns Fisher <wb1fj-bb@??????.??>
Cc: AMSAT BB <amsat-bb@?????.???>, Michael Hatzakis Jr MD
<mail@????????.???>
Subject: Re: [amsat-bb] Trying to get back on the sats... but G-5500
Failure
Message-ID:
<CAM4UQf1ba2P81JNNQAXDB8K8m1C7mR0jA8mb94dTi_bYL3AW4w@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
As a temp solution that could turn permanent, forget the elevation side
and just mount it at a fixed elevation of 15 degrees. As long as the gain
of your antennas is not too great (no more than 10 dBi approximately), it
will work perfectly for the LEO birds. Your gain at the horizon will only
be down 1 dB, and your gain at 65 or 70 deg will be more than adequate.
The small time the bird is >70 deg is of little consequence and because the
bird is near TCA (time of closest approach) then the signal is quite strong.
If your antennas are too high gain, take the front part of the boom off,
(removing directors), and the gain will drop.
I have been using this exact setup and work all the Low Earth Orbit birds
right down to the horizon.
73, N0AN
Hasan
On Fri, Mar 27, 2020, 5:17 PM Burns Fisher via AMSAT-BB <amsat-bb@?????.???>
wrote:
> So far, my problems with the 5500 have all been with the cables. One time
> a mouse chewed through it. Another time I discovered the bolt on my surge
> protector terminal was not tight. Not to say the 5500 never has hardware
> problems. One thing I'd look at is whether it is literally not rotating
> when power is applied, or whether it is the feedback pot/wiring that is
> bad. Worth a check so you can trace the wiring better
>
> But one interesting question is what elevation your antenna is frozen at?
> You could be successful for a while at either end of the pass if it is
> horizontal (depending on the beam width of your antennas). Maybe a bit
> more challenging if it is vertical.
>
> On Fri, Mar 27, 2020 at 5:50 PM Michael Hatzakis Jr MD via AMSAT-BB <
> amsat-bb@?????.???> wrote:
>
> > Jerry,
> >
> > Just for perspective. That rotor has been up for 15 years or more.
> Been
> > through multiple major storms, snow, ice, etc and has been flawless for
> > that entire time. This is the first failure in all that time, and more
> > than likely related to sitting dormant for 6 years. So, I would say,
> that
> > is pretty darn good. Can?t speak for others, but I don?t have an issues
> > with that duration of a failure free period.
> >
> > Michael Hatzakis Jr MD. K3MH
> >
> >
> >
> > > On Mar 27, 2020, at 2:21 PM, Gerald Witalec <jplanner@?????????.???>
> > wrote:
> > >
> > > Hi Michael,
> > > Been reading a lot on the AMSAT-BB and amazed about how many of you are
> > having problems with such an expensive rotor.
> > > I have decided not to purchase it and going to build my SAT station
> > instead with servo motors.
> > >
> > > Jerry...W8RQM
> > >
> > > On Friday, March 27, 2020, 4:58:27 PM EDT, Michael Hatzakis Jr MD via
> > AMSAT-BB <amsat-bb@?????.???> wrote:
> > >
> > >
> > > Hi guys/gals,
> > >
> > > I used to be very active on the Sats, and for years; have a great
> > set-up, but thanks to life events, went dark for about 5-6 years.
> > >
> > > Trying to find a silver lining in this COVID crisis, while my business
> > is in the tank, thought I would get back to my love of the birds.
> > >
> > > Unfortunately, I turned on my G-5500 controller and suddenly find the
> > elevation portion of the rotor isnt responding. Rotation is fine. Thanks
> > to my fearless days of my 40?s, the antenna is up on the chimney in a set
> > up thats a little challenging to service, so I am looking for what I can
> do
> > on the ground to try to debug and prepare first, before embarking on a
> roof
> > expedition.
> > >
> > > What are the common reasons for the elevation rotator to stop
> > responding? is there much I can do on the ground to debug, and/or
> prepare
> > when I go up on the roof to check the rotor out? What are the repair
> > options?
> > >
> > > Michael Hatzakis Jr MD K3MH
> > > mail@????????.??? <mailto:mail@????????.???> <mailto:mail@????????.???
> > <mailto:mail@????????.???>>
> > > _______________________________________________
> > > Sent via AMSAT-BB@?????.???. <mailto:AMSAT-BB@?????.???.> 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: https://www.amsat.org/mailman/listinfo/amsat-bb
> <
> > https://www.amsat.org/mailman/listinfo/amsat-bb>
> >
> > _______________________________________________
> > Sent via AMSAT-BB@?????.???. 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: https://www.amsat.org/mailman/listinfo/amsat-bb
> >
> _______________________________________________
> Sent via AMSAT-BB@?????.???. 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: https://www.amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 9
Date: Fri, 27 Mar 2020 18:25:59 -0500
From: Hasan al-Basri <hbasri.schiers6@?????.???>
To: Rich Gopstein <rich@????????????.???>
Cc: AMSAT-BB@?????.???
Subject: Re: [amsat-bb] Shortening M2 2MCP22?
Message-ID:
<CAM4UQf2RUu4V0R-z+b7iS_7m5PH5HeyiKM5N34R8GQBapwBbUA@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
It will work just fine for all the Mode B birds, if you reduce the boom
length. I've done it, no issues at all.
73, N0AN
Hasan
On Fri, Mar 27, 2020, 4:19 PM Rich Gopstein via AMSAT-BB <amsat-bb@?????.???>
wrote:
> I have an old 2mcp22 antenna that I would like to put up, but it's almost
> 20 feet long... Since I don't need that much gain for the current batch of
> satellites, I was wondering if I can use only one boom section and end up
> with a shorter 10 (2x5) element antenna.
>
> Would that have any undesirable effects (other than reducing gain and
> increasing beam width)?
>
> Thanks.
>
> Rich, KD2CQ
> _______________________________________________
> Sent via AMSAT-BB@?????.???. 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: https://www.amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 10
Date: Sat, 28 Mar 2020 00:04:51 +0000
From: "Joseph B. Fitzgerald" <jfitzgerald@????.???.???>
To: Burns Fisher <wb1fj-bb@??????.??>, Hasan al-Basri
<hbasri.schiers6@?????.???>
Cc: AMSAT BB <amsat-bb@?????.???>, Michael Hatzakis Jr MD
<mail@????????.???>
Subject: Re: [amsat-bb] Trying to get back on the sats... but G-5500
Failure
Message-ID:
<BLAPR22MB2115A9A36157DE2ACD6181E887CC0@?????????????.????????.????.???????.??
?>
Content-Type: text/plain; charset="iso-8859-1"
Hasan's idea is a good one. WB4APR has been preaching this from the Naval
Academy for some time ... in fact it is a US Navy design from the dawn of
the Space Age. Check out the link below. Note the slight, fixed elevation
of the Yagis on the mast. The Navy didn't take any chances with critters
eating cables either ... the operator simply grabbed the steering wheel that
you see in between the two R-390A's inside the hut and swung the antennas
around armstrong style.
https://fas.org/spp/military/program/sigint/grab.htm
de KM1P Joe
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End of AMSAT-BB Digest, Vol 15, Issue 99
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