[amsat-bb] Re: Fixed! Re: Landwehr 70cm preamp device question?

[i8cvs]

Hi Mark, N8MH

I have seen the pictures of your Landwehr 70 cm preamplifier and I
know very well the model of coax relays used in it.

They are 50 ohm coax relays Tohtsu CX 120 P for printed circuits and can
handle 150 watt pep at 500 MHz with an insertion loss of 0.2 dB and a
crosstallk (insulation) of 35 dB with a VSWR of 1,08 at 1 GHz

don't worry about to clean the contacts because they are very large silver
contacts and you just need to remove the side cover with your fingers
and spry a contact cleaner over it.

I use four of them in my switching four polarizations switcher on a 70 cm
crossed yagi as you can read into the AMSAT Journal March/April and
May/June 2007

Have fun

73" de

i8CVS Domenico

- Original Message -
From: "Mark L. Hammond" 
To: "i8cvs" ; "Amsat - BBs" 
Cc: "Vince Fiscus, KB7ADL" ; "K5OE" 
Sent: Thursday, June 02, 2011 3:33 AM
Subject: Re: Fixed! Re: Landwehr 70cm preamp device question?


> Hello Domenico I8CVS,
>
> I did take pictures while I had the cover off :)  You can see and download
them here:
>
> https://sites.google.com/site/marklhammond/hamradio
>
> Indeed, they are labeled "COAXIAL RELAYS" as you suspected.
>
> You can also see the "little white button" on the relays that I mentioned
previously.
>
> 73!
>
> Mark N8MH
>
> At 02:42 AM 6/2/2011 +0200, i8cvs wrote:
> >Hi Mark, N8MH and All guys on the list.
> >
> >I am very happy that you solved the problem on your preamplifier and
since
> >you took the cover off I would like to know if the relays are or not
> >"COAXIAL RELAYS" or just non constant impedance relays for AC or DC
> >applications.
> >
> >Can you take a picture on the inside of preamplifier and send it to me by
> >email ?
> >
> >I remember that the owner of Landwehr was a 432 MHz EME'r in the early
1973
> >and I worked him off the moon but actually I don't remember his call
letter
> >from Sweden.
> >
> >I believe that he dismitted the production of the above preamplifiers
many
> >years ago.
> >
> >Tanks
> >
> >73" de
> >
> >i8CVS Domenico
> >
> >- Original Message -
> >From: "Mark L. Hammond" 
> >To: "Amsat - BBs" 
> >Cc: "i8cvs" ; "Vince Fiscus, KB7ADL"
> >; "K5OE" 
> >Sent: Thursday, June 02, 2011 1:44 AM
> >Subject: Fixed! Re: Landwehr 70cm preamp device question?
> >
> >
> >> Hello All,
> >>
> >> You gotta love a happy ending ;)
> >>
> >> Thanks to I8CVS, Domenico; Vince, KB7ADL; and Jerry, K5OE for the
advice
> >and coaching with troubleshooting my Landwehr 70 cm preamp.
> >>
> >> I took the cover off and applied 12V, and the two relays closedor
did
> >they?!?
> >>
> >> One side looked good, while the other side didn't quite push the
"little
> >white button" enough to make the contacts meet.  It was stuck--just a
gentle
> >push with the finger, and I could tell it had become "unstuck."  Inserted
> >back in line, and bingo!  It's working just fine.
> >>
> >> I have resisted my urges to spray something down in there...figure I
can
> >unstick it the same way another time, should it happen.  Looks like the
> >preamp was made in 1990, based on the dates of the relays.
> >>
> >> What I was seeing seemed like it might be a relay issue on one side
(could
> >hear a rise in noise, so the relay at the output side (rig) was
working--but
> >the relay on the input side (antenna) wasn't.  So, when powered, the
input
> >relay didn't switch over correctly--what I was seeing now makes sense!
> >>
> >> Anyhow, it wasn't the GaAsFET after all.
> >>
> >> Thanks again for the help, guys.
> >>
> >> 73,
> >>
> >> Mark N8MH
> >>
> >>
> >> >>- Original Message -
> >> >>From: "Mark L. Hammond" 
> >> >>To: "Amsat - BBs" 
> >> >>Sent: Tuesday, May 31, 2011 8:00 PM
> >> >>Subject: [amsat-bb] Landwehr 70cm preamp device question?
> >> >>
> >> >>> Hello All,
> >> >>>
> >> >>> I have an old Landwehr preamp that apparently uses the MGF1402
device
> >> >>> (does that sound right?).  It's not working so I presume it's the
> >> >>> GaAsFET.
> >> >>>
> >> >>> Can the MGF1302 be substituted for the original MGF1402?  Or can
> >> >>> anybody recommend another device for the 70 cm Landwehr?
> >> >>>
> >> >>> I need to do something...
> >> >>>
> >> >>> Thanks in advance!
> >> >>>
> >> >>> --
> >> >>> Mark L. Hammond [N8MH]
> >>
>

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[amsat-bb] w1w this weekend

[Rodney Waln]

kc0zhf will be operating satellite's as w1w special events 
as will others that are doing HF contacts, for the Wyoming state convention
good chance to get WY and DN71 if you need them,
Rodney
kc0zhf
VP shywy ARC
WY amsat area coordinator
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[amsat-bb] Question about duplexers/diplexers

[Mark Lunday]

I want to use a single coax for three rigs, feeding to three antennas.


Rig 1 = 6 meters
Rig 2 = 2 meters
Rig 3 = 70 cm

Each has its own antenna at the remote tower.

Question #1: I should use a triplexer at the shack where the three antennas
combine to the single coax, and a triplexer at the antenna where the three
antennas are located.  Correct?
Question #2: any recommendations on which is best?  I was looking at the
Comet CFX5140
Question #3: can I run 12V through it to power my mast-mount preamps at the
tower?

Mark Lunday, WD4ELG
Greensboro, NC  FM06be
wd4...@arrl.net
http://wd4elg.blogspot.com
http://wd4elg.net


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[amsat-bb] AO-51 over Hawaii

[Robert Smith]

ALOHA

Nothing heard from AO-51 on 145.150 up, 435.880 down
(hope those are  the right freqs).  AO-51 was coming out of eclipse
having crossed over the south pacific. High pass.

73
robert, NH7WN
Honolulu

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[amsat-bb] Show Low AZ hamfest on Saturday (4 June)

[Patrick STODDARD (WD9EWK/VA7EWK)]

Hi!

Just as I got back from Australia a few days ago and have been back 
to the office, I will be at another hamfest on Saturday morning.  I 
will be at the White Mountain Hamfest in Show Low, Arizona.  The 
hamfest is at the Show Low campus of Northland Pioneer College along 
Deuce of Clubs Avenue, hosted by the Kachina Amateur Radio Club.  
More information about the hamfest is available at:

http://www.whitemountainhamfest.com/

WD9EWK will be on various satellite passes throughout the hamfest, 
which is officially slated to run from 7am to 1pm (1400-2000 UTC).  
If I can get into the hamfest site earlier, I will try to work passes 
starting around 1300 UTC.  Please call WD9EWK if you hear me on the 
air.  The hamfest is in grid DM44xf.

After the hamfest, I may make a short drive to the DM44/DM54 grid 
boundary very close to Show Low for the afternoon and maybe early
evening passes.  Depending on when everyone starts shutting down 
at the hamfest, I may try for a spot north of the hamfest along 
I-40 and look to operate from the DM54/DM55 boundary (a location I 
worked from a couple of years ago).  Regardless of where I end up 
for the afternoon, I will return home Saturday evening.  

As with my other hamfests and road trips, I will be happy to confirm
QSOs made with WD9EWK.  No need to first send me a QSL card; just an
e-mail with the QSO details will suffice.  I will also upload all QSOs
to Logbook of the World.  

73!





Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/


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[amsat-bb] Museum Ships Weekend

[Rick Tejera]

All,

 

This weekend, I'll be operating with the Thunderbird Amateur radio Club from
the anchor & Signal mast of the USS Arizona during Museum Ships weekend.
While most of my operating will be on Sunday on HF, I hope to be able to
work a pass or two on the birds. Not sure what ones but listen for me, I'll
be operating under the club's call W7TBC from grid DM33wk.

 

I'll try to post a list of passes as the day draws nearer.

 

For more info on Ships weekend: http://www.nj2bb.org/museum/

 

 

Clear Skies

 

Rick Tejera

Saguaro Astronomy Club

Phoenix, Arizona

  www.saguaroastro.org

saguaroas...@cox.net 

K7TEJ, AMSAT 38452

 

 

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[amsat-bb] Re: Fixed! Re: Landwehr 70cm preamp device question?

[Mark L. Hammond]

One more update:  the relays can be purchased here!

http://radiodan.com/ted_stuff/tohtsu.htm

73,

Mark N8MH 


At 09:33 PM 6/1/2011 -0400, Mark L. Hammond wrote:
>Hello Domenico I8CVS,
>
>I did take pictures while I had the cover off :)  You can see and download 
>them here:
>
>https://sites.google.com/site/marklhammond/hamradio
>
>Indeed, they are labeled "COAXIAL RELAYS" as you suspected. 
>
>You can also see the "little white button" on the relays that I mentioned 
>previously.
>
>73!
>
>Mark N8MH 
>
>At 02:42 AM 6/2/2011 +0200, i8cvs wrote:
>>Hi Mark, N8MH and All guys on the list.
>>
>>I am very happy that you solved the problem on your preamplifier and since
>>you took the cover off I would like to know if the relays are or not
>>"COAXIAL RELAYS" or just non constant impedance relays for AC or DC
>>applications.
>>
>>Can you take a picture on the inside of preamplifier and send it to me by
>>email ?
>>
>>I remember that the owner of Landwehr was a 432 MHz EME'r in the early 1973
>>and I worked him off the moon but actually I don't remember his call letter
>>from Sweden.
>>
>>I believe that he dismitted the production of the above preamplifiers many
>>years ago.
>>
>>Tanks
>>
>>73" de
>>
>>i8CVS Domenico
>>
>>- Original Message -
>>From: "Mark L. Hammond" 
>>To: "Amsat - BBs" 
>>Cc: "i8cvs" ; "Vince Fiscus, KB7ADL"
>>; "K5OE" 
>>Sent: Thursday, June 02, 2011 1:44 AM
>>Subject: Fixed! Re: Landwehr 70cm preamp device question?
>>
>>
>>> Hello All,
>>>
>>> You gotta love a happy ending ;)
>>>
>>> Thanks to I8CVS, Domenico; Vince, KB7ADL; and Jerry, K5OE for the advice
>>and coaching with troubleshooting my Landwehr 70 cm preamp.
>>>
>>> I took the cover off and applied 12V, and the two relays closedor did
>>they?!?
>>>
>>> One side looked good, while the other side didn't quite push the "little
>>white button" enough to make the contacts meet.  It was stuck--just a gentle
>>push with the finger, and I could tell it had become "unstuck."  Inserted
>>back in line, and bingo!  It's working just fine.
>>>
>>> I have resisted my urges to spray something down in there...figure I can
>>unstick it the same way another time, should it happen.  Looks like the
>>preamp was made in 1990, based on the dates of the relays.
>>>
>>> What I was seeing seemed like it might be a relay issue on one side (could
>>hear a rise in noise, so the relay at the output side (rig) was working--but
>>the relay on the input side (antenna) wasn't.  So, when powered, the input
>>relay didn't switch over correctly--what I was seeing now makes sense!
>>>
>>> Anyhow, it wasn't the GaAsFET after all.
>>>
>>> Thanks again for the help, guys.
>>>
>>> 73,
>>>
>>> Mark N8MH
>>>
>>>
>>> >>- Original Message -
>>> >>From: "Mark L. Hammond" 
>>> >>To: "Amsat - BBs" 
>>> >>Sent: Tuesday, May 31, 2011 8:00 PM
>>> >>Subject: [amsat-bb] Landwehr 70cm preamp device question?
>>> >>
>>> >>> Hello All,
>>> >>>
>>> >>> I have an old Landwehr preamp that apparently uses the MGF1402 device
>>> >>> (does that sound right?).  It's not working so I presume it's the
>>> >>> GaAsFET.
>>> >>>
>>> >>> Can the MGF1302 be substituted for the original MGF1402?  Or can
>>> >>> anybody recommend another device for the 70 cm Landwehr?
>>> >>>
>>> >>> I need to do something...
>>> >>>
>>> >>> Thanks in advance!
>>> >>>
>>> >>> --
>>> >>> Mark L. Hammond [N8MH]
>>>
>
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[amsat-bb] Re: Fixed! Re: Landwehr 70cm preamp device question?

[Mark L. Hammond]

Hello Domenico I8CVS,

I did take pictures while I had the cover off :)  You can see and download them 
here:

https://sites.google.com/site/marklhammond/hamradio

Indeed, they are labeled "COAXIAL RELAYS" as you suspected. 

You can also see the "little white button" on the relays that I mentioned 
previously.

73!

Mark N8MH 

At 02:42 AM 6/2/2011 +0200, i8cvs wrote:
>Hi Mark, N8MH and All guys on the list.
>
>I am very happy that you solved the problem on your preamplifier and since
>you took the cover off I would like to know if the relays are or not
>"COAXIAL RELAYS" or just non constant impedance relays for AC or DC
>applications.
>
>Can you take a picture on the inside of preamplifier and send it to me by
>email ?
>
>I remember that the owner of Landwehr was a 432 MHz EME'r in the early 1973
>and I worked him off the moon but actually I don't remember his call letter
>from Sweden.
>
>I believe that he dismitted the production of the above preamplifiers many
>years ago.
>
>Tanks
>
>73" de
>
>i8CVS Domenico
>
>- Original Message -
>From: "Mark L. Hammond" 
>To: "Amsat - BBs" 
>Cc: "i8cvs" ; "Vince Fiscus, KB7ADL"
>; "K5OE" 
>Sent: Thursday, June 02, 2011 1:44 AM
>Subject: Fixed! Re: Landwehr 70cm preamp device question?
>
>
>> Hello All,
>>
>> You gotta love a happy ending ;)
>>
>> Thanks to I8CVS, Domenico; Vince, KB7ADL; and Jerry, K5OE for the advice
>and coaching with troubleshooting my Landwehr 70 cm preamp.
>>
>> I took the cover off and applied 12V, and the two relays closedor did
>they?!?
>>
>> One side looked good, while the other side didn't quite push the "little
>white button" enough to make the contacts meet.  It was stuck--just a gentle
>push with the finger, and I could tell it had become "unstuck."  Inserted
>back in line, and bingo!  It's working just fine.
>>
>> I have resisted my urges to spray something down in there...figure I can
>unstick it the same way another time, should it happen.  Looks like the
>preamp was made in 1990, based on the dates of the relays.
>>
>> What I was seeing seemed like it might be a relay issue on one side (could
>hear a rise in noise, so the relay at the output side (rig) was working--but
>the relay on the input side (antenna) wasn't.  So, when powered, the input
>relay didn't switch over correctly--what I was seeing now makes sense!
>>
>> Anyhow, it wasn't the GaAsFET after all.
>>
>> Thanks again for the help, guys.
>>
>> 73,
>>
>> Mark N8MH
>>
>>
>> >>- Original Message -
>> >>From: "Mark L. Hammond" 
>> >>To: "Amsat - BBs" 
>> >>Sent: Tuesday, May 31, 2011 8:00 PM
>> >>Subject: [amsat-bb] Landwehr 70cm preamp device question?
>> >>
>> >>> Hello All,
>> >>>
>> >>> I have an old Landwehr preamp that apparently uses the MGF1402 device
>> >>> (does that sound right?).  It's not working so I presume it's the
>> >>> GaAsFET.
>> >>>
>> >>> Can the MGF1302 be substituted for the original MGF1402?  Or can
>> >>> anybody recommend another device for the 70 cm Landwehr?
>> >>>
>> >>> I need to do something...
>> >>>
>> >>> Thanks in advance!
>> >>>
>> >>> --
>> >>> Mark L. Hammond [N8MH]
>>

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[amsat-bb] Re: Fixed! Re: Landwehr 70cm preamp device question?

[i8cvs]

Hi Mark, N8MH and All guys on the list.

I am very happy that you solved the problem on your preamplifier and since
you took the cover off I would like to know if the relays are or not
"COAXIAL RELAYS" or just non constant impedance relays for AC or DC
applications.

Can you take a picture on the inside of preamplifier and send it to me by
email ?

I remember that the owner of Landwehr was a 432 MHz EME'r in the early 1973
and I worked him off the moon but actually I don't remember his call letter
from Sweden.

I believe that he dismitted the production of the above preamplifiers many
years ago.

Tanks

73" de

i8CVS Domenico

- Original Message -
From: "Mark L. Hammond" 
To: "Amsat - BBs" 
Cc: "i8cvs" ; "Vince Fiscus, KB7ADL"
; "K5OE" 
Sent: Thursday, June 02, 2011 1:44 AM
Subject: Fixed! Re: Landwehr 70cm preamp device question?


> Hello All,
>
> You gotta love a happy ending ;)
>
> Thanks to I8CVS, Domenico; Vince, KB7ADL; and Jerry, K5OE for the advice
and coaching with troubleshooting my Landwehr 70 cm preamp.
>
> I took the cover off and applied 12V, and the two relays closedor did
they?!?
>
> One side looked good, while the other side didn't quite push the "little
white button" enough to make the contacts meet.  It was stuck--just a gentle
push with the finger, and I could tell it had become "unstuck."  Inserted
back in line, and bingo!  It's working just fine.
>
> I have resisted my urges to spray something down in there...figure I can
unstick it the same way another time, should it happen.  Looks like the
preamp was made in 1990, based on the dates of the relays.
>
> What I was seeing seemed like it might be a relay issue on one side (could
hear a rise in noise, so the relay at the output side (rig) was working--but
the relay on the input side (antenna) wasn't.  So, when powered, the input
relay didn't switch over correctly--what I was seeing now makes sense!
>
> Anyhow, it wasn't the GaAsFET after all.
>
> Thanks again for the help, guys.
>
> 73,
>
> Mark N8MH
>
>
> >>- Original Message -
> >>From: "Mark L. Hammond" 
> >>To: "Amsat - BBs" 
> >>Sent: Tuesday, May 31, 2011 8:00 PM
> >>Subject: [amsat-bb] Landwehr 70cm preamp device question?
> >>
> >>> Hello All,
> >>>
> >>> I have an old Landwehr preamp that apparently uses the MGF1402 device
> >>> (does that sound right?).  It's not working so I presume it's the
> >>> GaAsFET.
> >>>
> >>> Can the MGF1302 be substituted for the original MGF1402?  Or can
> >>> anybody recommend another device for the 70 cm Landwehr?
> >>>
> >>> I need to do something...
> >>>
> >>> Thanks in advance!
> >>>
> >>> --
> >>> Mark L. Hammond [N8MH]
>

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[amsat-bb] Fixed! Re: Landwehr 70cm preamp device question?

[Mark L. Hammond]

Hello All,

You gotta love a happy ending ;)

Thanks to I8CVS, Domenico; Vince, KB7ADL; and Jerry, K5OE for the advice and 
coaching with troubleshooting my Landwehr 70 cm preamp.

I took the cover off and applied 12V, and the two relays closedor did 
they?!?  

One side looked good, while the other side didn't quite push the "little white 
button" enough to make the contacts meet.  It was stuck--just a gentle push 
with the finger, and I could tell it had become "unstuck."  Inserted back in 
line, and bingo!  It's working just fine.  

I have resisted my urges to spray something down in there...figure I can 
unstick it the same way another time, should it happen.  Looks like the preamp 
was made in 1990, based on the dates of the relays. 

What I was seeing seemed like it might be a relay issue on one side (could hear 
a rise in noise, so the relay at the output side (rig) was working--but the 
relay on the input side (antenna) wasn't.  So, when powered, the input relay 
didn't switch over correctly--what I was seeing now makes sense!

Anyhow, it wasn't the GaAsFET after all.  

Thanks again for the help, guys.

73,

Mark N8MH 


>>- Original Message - 
>>From: "Mark L. Hammond" 
>>To: "Amsat - BBs" 
>>Sent: Tuesday, May 31, 2011 8:00 PM
>>Subject: [amsat-bb] Landwehr 70cm preamp device question?
>>
>>> Hello All,
>>> 
>>> I have an old Landwehr preamp that apparently uses the MGF1402 device
>>> (does that sound right?).  It's not working so I presume it's the
>>> GaAsFET.
>>> 
>>> Can the MGF1302 be substituted for the original MGF1402?  Or can
>>> anybody recommend another device for the 70 cm Landwehr?
>>> 
>>> I need to do something...
>>> 
>>> Thanks in advance!
>>> 
>>> -- 
>>> Mark L. Hammond [N8MH]

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[amsat-bb] Re: What Astronauts Photograph

[Donald Jacob]

Very nice,
Thanks Clint

Don  WB5EKU

On Wed, Jun 1, 2011 at 2:41 PM, Clint Bradford  wrote:
> This high definition short is a fascinating document. Narrated by NASA's Dr. 
> Justin Wilkinson, it shows a tour of planet Earth as seen by astronauts, 
> explaining what are the places that they first focus on while in orbit.
>
> http://www.youtube.com/watch?v=rj18UQjPpGA
>
>
> Clint Bradford
> clintbradf...@mac.com
>
>
>
>
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[amsat-bb] What Astronauts Photograph

[Clint Bradford]

This high definition short is a fascinating document. Narrated by NASA's Dr. 
Justin Wilkinson, it shows a tour of planet Earth as seen by astronauts, 
explaining what are the places that they first focus on while in orbit.

http://www.youtube.com/watch?v=rj18UQjPpGA


Clint Bradford
clintbradf...@mac.com




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[amsat-bb] Re: G5500 change voltage supply

[i8cvs]

Hi,

Apologise ! I was wrong and please amend my previous message with
with the following one

73" de
i8CVS Domenico

- Original Message -
From: "i8cvs" 
To: "Bill Dzurilla" ; "Amsat - BBs"

Cc: 
Sent: Wednesday, June 01, 2011 10:13 PM
Subject: Re: [amsat-bb] Re: G5500 change voltage supply


> Hi Bill, NZ5N
>
> I was looking at the schematic diagram
> http://www.hamcity.com/store/pc/catalog/pdf/220vconversion.pdf
>
> As I suspected the transformer has 4 wires coming off from the
> primary windings.
>
> In my opinion the transformer has two identical primary windings
> to work in parallel from 100 to 117 volt and in series with 220 volt
>
> For 100 or 117 volt jump terminal 0 to terminal 2 and  terminal 1
> to terminal 3 so that both primary windings are in parallel and in phase
> after that connect the 117 volt line to terminals 0 and 1 or 2 and 3
>
> For 220 volt jump terminal 1 to terminal 2 and connect the 220 volt
> line to terminals 0 and 3
>
> 73" de
>
> i8CVS Domenico
>
> - Original Message -
> From: "Bill Dzurilla" 
> To: 
> Cc: 
> Sent: Wednesday, June 01, 2011 6:53 PM
> Subject: [amsat-bb] Re: G5500 change voltage supply
>
>
> Here is the mod to change Yaesu rotors to 220v:
> http://www.hamcity.com/store/pc/catalog/pdf/220vconversion.pdf
>
> But perhaps yours has a different transformer if it uses pin 3 for 117v.
In
> the mod, pins 0 and 3 are for 220v.
>
> 73, Bill NZ5N
>
> > Subject: [amsat-bb] G5500 change voltage supply
> >
> > I have purchased a G5500. The control box have a
> > 117Vac label in the real
> > panel. I opened it and a wire is connected through
> > the fuse to the terminal
> > number 3 of the KT-30 transformer and the other wire
> > through the main switch
> > to the terminal number 1 of the KT-30 transformer.
> >
> > I am wondering how I should connect it to work with 220Vac
> > in Europe.
> >
> > Thanks in advance. ea4...@amsat.org
>
>
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[amsat-bb] Re: G5500 change voltage supply

[i8cvs]

Hi Bill, NZ5N

I was looking at the schematic diagram
http://www.hamcity.com/store/pc/catalog/pdf/220vconversion.pdf

As I suspected the transformer has 4 wires coming off from the
primary windings.

In my opinion the transformer has two identical primary windings
to work in parallel from 100 to 117 volt and in series with 220 volt

For 100 or 117 volt connect terminal 0 with terminal 2 and the terminal
1 to terminal 3 so that both primary windings are in parallel and in phase
after that connect the 117 volt line to terminals 0 and 2

For 220 volt connect terminal 1 to terminal 2 and the 220 volt line to
terminals 0 and 3

73" de

i8CVS Domenico

- Original Message -
From: "Bill Dzurilla" 
To: 
Cc: 
Sent: Wednesday, June 01, 2011 6:53 PM
Subject: [amsat-bb] Re: G5500 change voltage supply


Here is the mod to change Yaesu rotors to 220v:
http://www.hamcity.com/store/pc/catalog/pdf/220vconversion.pdf

But perhaps yours has a different transformer if it uses pin 3 for 117v.  In
the mod, pins 0 and 3 are for 220v.

73, Bill NZ5N

> Subject: [amsat-bb] G5500 change voltage supply
>
> I have purchased a G5500. The control box have a
> 117Vac label in the real
> panel. I opened it and a wire is connected through
> the fuse to the terminal
> number 3 of the KT-30 transformer and the other wire
> through the main switch
> to the terminal number 1 of the KT-30 transformer.
>
> I am wondering how I should connect it to work with 220Vac
> in Europe.
>
> Thanks in advance. ea4...@amsat.org


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[amsat-bb] SAT VUCC

[RONALD CADE]

SAT VUCC standings now on LotW, June 1 2011

Ron, W6ZQ
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[amsat-bb] Re: G5500 change voltage supply

[Bill Dzurilla]

The pdf say "G5500" in handwriting and I know a guy who says he did this mod on 
a G5500.  But obviously the KT-30 must be a different transformer.

73, Bill 

--- On Wed, 6/1/11, Dee  wrote:

> From: Dee 
> Subject: RE: [amsat-bb] Re: G5500 change voltage supply
> To: "'Bill Dzurilla'" , amsat-bb@amsat.org
> Cc: ea4...@amsat.org
> Date: Wednesday, June 1, 2011, 1:24 PM
> Look closer--Wrong rotor and I
> imagine you jump the other connections
> together to have the voltage correct.
> Again, Check the G5500 manual.
> Dee 
> 
> -Original Message-
> From: amsat-bb-boun...@amsat.org
> [mailto:amsat-bb-boun...@amsat.org]
> On
> Behalf Of Bill Dzurilla
> Sent: Wednesday, June 01, 2011 12:53 PM
> To: amsat-bb@amsat.org
> Cc: ea4...@amsat.org
> Subject: [amsat-bb] Re: G5500 change voltage supply
> 
> Here is the mod to change Yaesu rotors to 220v:
> http://www.hamcity.com/store/pc/catalog/pdf/220vconversion.pdf
> 
> But perhaps yours has a different transformer if it uses
> pin 3 for 117v.  In
> the mod, pins 0 and 3 are for 220v.
> 
> 73, Bill NZ5N
> 
> > Subject: [amsat-bb] G5500 change voltage supply
> > 
> > I have purchased a G5500.  The control box have a
> 117Vac label  in the 
> > real panel.  I opened it and a wire is connected
> through the fuse to 
> > the terminal number 3 of the KT-30 transformer and the
> other wire 
> > through the main switch to the terminal number 1 of
> the KT-30 
> > transformer.
> > 
> > I am wondering how I should connect it to work with
> 220Vac in Europe.
> > 
> > Thanks in advance. ea4...@amsat.org
> 
> 
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> satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
> 
> 
> 

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[amsat-bb] Re: G5500 change voltage supply

[Dee]

Look closer--Wrong rotor and I imagine you jump the other connections
together to have the voltage correct.
Again, Check the G5500 manual.
Dee 

-Original Message-
From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On
Behalf Of Bill Dzurilla
Sent: Wednesday, June 01, 2011 12:53 PM
To: amsat-bb@amsat.org
Cc: ea4...@amsat.org
Subject: [amsat-bb] Re: G5500 change voltage supply

Here is the mod to change Yaesu rotors to 220v:
http://www.hamcity.com/store/pc/catalog/pdf/220vconversion.pdf

But perhaps yours has a different transformer if it uses pin 3 for 117v.  In
the mod, pins 0 and 3 are for 220v.

73, Bill NZ5N

> Subject: [amsat-bb] G5500 change voltage supply
> 
> I have purchased a G5500.  The control box have a 117Vac label  in the 
> real panel.  I opened it and a wire is connected through the fuse to 
> the terminal number 3 of the KT-30 transformer and the other wire 
> through the main switch to the terminal number 1 of the KT-30 
> transformer.
> 
> I am wondering how I should connect it to work with 220Vac in Europe.
> 
> Thanks in advance. ea4...@amsat.org


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[amsat-bb] Re: Thrust bearing maintenance

[Edward R. Cole]

At 04:19 AM 6/1/2011, Stephen  E. Belter wrote:
>I have an Yaesu GS-050 thrust bearing that has been installed for 
>about 15 years.  The thrust bearing turns, but requires a lot of force.
>
>I disassembled the thrust bearing to find that the grease is very 
>sticky (think candy apple sticky), and not lubricative (if that is a word).
>
>Should I take it to an auto repair shop and ask them to degrease and 
>then lubricate similar to repacking a wheel bearing?
>
>What kind of grease should be used?
>
>Thanks and 73, Steve N9IP
>--
>Steve Belter

Steve,

When I was building my tower#2 in 2008, I considered buying a Rohn 
TH-3 thrust bearing (about $200+) and was advised to look in ebay.  I 
found a nice 3-inch ball-bearing radial-thrust bearing for about $35 
(brand new).  It has a zerk fitting for a grease gun to maintain the 
lubrication (which at the slow rotation of antennas is almost 
never).  Ebay might be cheaper than a re-build.

73, Ed - KL7UW



73, Ed - KL7UW, WD2XSH/45
==
BP40IQ   500 KHz - 10-GHz   www.kl7uw.com
EME: 50-1.1kw?, 144-1.4kw, 432-100w, 1296-testing*, 3400-?
DUBUS Magazine USA Rep dubus...@hotmail.com
==
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[amsat-bb] Re: G5500 change voltage supply

[Bill Dzurilla]

Here is the mod to change Yaesu rotors to 220v:
http://www.hamcity.com/store/pc/catalog/pdf/220vconversion.pdf

But perhaps yours has a different transformer if it uses pin 3 for 117v.  In 
the mod, pins 0 and 3 are for 220v.

73, Bill NZ5N

> Subject: [amsat-bb] G5500 change voltage supply
> 
> I have purchased a G5500.  The control box have a
> 117Vac label  in the real
> panel.  I opened it and a wire is connected through
> the fuse to the terminal
> number 3 of the KT-30 transformer and the other wire
> through the main switch
> to the terminal number 1 of the KT-30 transformer.
> 
> I am wondering how I should connect it to work with 220Vac
> in Europe.
> 
> Thanks in advance. ea4...@amsat.org


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[amsat-bb] History of OSCAR

[Clint Bradford]

There is a WONDERFUL 103-slide presentation posted on the front page of the 
AMSAT-NA site. 

"AMSAT Slide Show Space Day 2011" is a 5.6MB .pdf, prepared by Perry Klein, 
W3PK and Dick Daniels, W4PUJ. It contains some great photographs from the 
archives on Project OSCAR and AMSAT. Truly a "must-view!"

Clint Bradford, K6LCS
http://www.work-sat.com




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[amsat-bb] Re: Thrust bearing maintenance

[David Barber]

Right or wrong, I use a Molybdenum Disulphide based grease.  Over here (UK)
Castrol Moly Grease.

I use it for bearings, rotators and mast use.  Always worked for me.

Degrease the housing and balls with spirit, clean and allow to dry.  If the
balls are unduly worn I'd replace them.  Then repack with grease and
assemble.



-Original Message-
From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On
Behalf Of Stephen E. Belter
Sent: 01 June 2011 13:20
To: amsat-bb@amsat.org
Subject: [amsat-bb] Thrust bearing maintenance

I have an Yaesu GS-050 thrust bearing that has been installed for about 15
years.  The thrust bearing turns, but requires a lot of force.  

I disassembled the thrust bearing to find that the grease is very sticky
(think candy apple sticky), and not lubricative (if that is a word).  

Should I take it to an auto repair shop and ask them to degrease and then
lubricate similar to repacking a wheel bearing?  

What kind of grease should be used?

Thanks and 73, Steve N9IP
--
Steve Belter

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[amsat-bb] Re: Thrust bearing maintenance

[(kp4tr)Ramon Gonzalez]

I own this  thrust bearing but imho it is not worth investing time and material 
in such a low cost item. Get a new one and save yourself time. Clean the old 
one and sell it on ebay as used. 

Sent from my Adobe Flash and Java challenged iPhone

On Jun 1, 2011, at 9:07 AM, "Zachary Beougher"  wrote:

> Hi Steve,
> 
> I don't have any experience with rotors, but a car repair shop is going to 
> charge you an arm and a leg for something you can probably do yourself.
> 
> Go to AutoZone and pickup a can of heavy engine degreaser (the red can w/ 
> orange lid is the good stuff).  You can also pickup a can of wheel bearing 
> grease (should say that on the can), and use that to repack the bearing.  If 
> you don't see the grease just ask one of the employees and show them what 
> you are using it on.  You can also get this stuff at any store that carries 
> auto supplies.
> 
> Hope that helps...
> 
> 73!
> 
> Zack
> KD8KSN
> 
> -Original Message- 
> From: Stephen E. Belter
> Sent: Wednesday, June 01, 2011 8:19 AM
> To: amsat-bb@amsat.org
> Subject: [amsat-bb] Thrust bearing maintenance
> 
> I have an Yaesu GS-050 thrust bearing that has been installed for about 15 
> years.  The thrust bearing turns, but requires a lot of force.
> 
> I disassembled the thrust bearing to find that the grease is very sticky 
> (think candy apple sticky), and not lubricative (if that is a word).
> 
> Should I take it to an auto repair shop and ask them to degrease and then 
> lubricate similar to repacking a wheel bearing?
> 
> What kind of grease should be used?
> 
> Thanks and 73, Steve N9IP
> --
> Steve Belter
> 
> 
> 
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[amsat-bb] Re: AO51

[Mark L. Hammond]

It wasn't on.

Mark N8MH

On Wed, Jun 1, 2011 at 9:14 AM,   wrote:
> Did not hear AO51 this morning 12.13 utc   150/880?
> WA4HFN em55
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-- 
Mark L. Hammond [N8MH]

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[amsat-bb] Re: Thrust bearing maintenance

[Zachary Beougher]

Hi Steve,

I don't have any experience with rotors, but a car repair shop is going to 
charge you an arm and a leg for something you can probably do yourself.

Go to AutoZone and pickup a can of heavy engine degreaser (the red can w/ 
orange lid is the good stuff).  You can also pickup a can of wheel bearing 
grease (should say that on the can), and use that to repack the bearing.  If 
you don't see the grease just ask one of the employees and show them what 
you are using it on.  You can also get this stuff at any store that carries 
auto supplies.

Hope that helps...

73!

Zack
KD8KSN

-Original Message- 
From: Stephen E. Belter
Sent: Wednesday, June 01, 2011 8:19 AM
To: amsat-bb@amsat.org
Subject: [amsat-bb] Thrust bearing maintenance

I have an Yaesu GS-050 thrust bearing that has been installed for about 15 
years.  The thrust bearing turns, but requires a lot of force.

I disassembled the thrust bearing to find that the grease is very sticky 
(think candy apple sticky), and not lubricative (if that is a word).

Should I take it to an auto repair shop and ask them to degrease and then 
lubricate similar to repacking a wheel bearing?

What kind of grease should be used?

Thanks and 73, Steve N9IP
--
Steve Belter



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[amsat-bb] Re: G5500 change voltage supply

[Dee]

I have both rotor manuals for G5500   -& G5400/5600 Yaesu units.  The
schematics for both DO NOT show any wiring changes for the transformers to
work on 117VAC or 220VAC.  The manuals do say that there are "Different"
transformers for 117 and 220 VAC use.  It even states that they should be
returned to have the proper transformer installed if incorrect-  This means
that there may not be a universal transformer installed and only wiring
changes to correct the AC input.  Check with Yaesu for the correct
transformer part number required.
Good Luck,
Dee, NB2F 

-Original Message-
From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On
Behalf Of Juan Antonio Fernandez
Sent: Wednesday, June 01, 2011 5:04 AM
To: amsat-bb@amsat.org
Subject: [amsat-bb] G5500 change voltage supply

I have purchased a G5500.  The control box have a 117Vac label  in the real
panel.  I opened it and a wire is connected through the fuse to the terminal
number 3 of the KT-30 transformer and the other wire through the main switch
to the terminal number 1 of the KT-30 transformer.

I am wondering how I should connect it to work with 220Vac in Europe.

Thanks in advance. ea4...@amsat.org
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[amsat-bb] Re: Thrust bearing maintenance

[Dee]

Steve,
I worked with bearings for many years as a Gyro overhauler and radar tech
for Sperry.  The bearings I worked with were all high quality and close
tolerance.  If you want to, you can remove the grease with a degreaser and
repack.  Unless it was used constantly spinning, I don't think it could be
worn-Just weathered grease.  If you go to an auto supply place, you will
find the wheelpacking high temp type and it will work fine.  Replacing the
thrust bearing probably would be the best way to go.  It shouldn't be bound
up at all and free to rotate.  It IS supposed to support the mast to
alleviate pressure on the rotor.
Your call since you are doing this.
73,
Dee, NB2F
 

-Original Message-
From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On
Behalf Of Stephen E. Belter
Sent: Wednesday, June 01, 2011 8:20 AM
To: amsat-bb@amsat.org
Subject: [amsat-bb] Thrust bearing maintenance

I have an Yaesu GS-050 thrust bearing that has been installed for about 15
years.  The thrust bearing turns, but requires a lot of force.  

I disassembled the thrust bearing to find that the grease is very sticky
(think candy apple sticky), and not lubricative (if that is a word).  

Should I take it to an auto repair shop and ask them to degrease and then
lubricate similar to repacking a wheel bearing?  

What kind of grease should be used?

Thanks and 73, Steve N9IP
--
Steve Belter



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[amsat-bb] Re: Flames on Endeavor

[Tom Azlin N4ZPT]

Yes normal. Yes the APU. And seen on every single landing just daytime 
landings looks like steam not flames. But the noise is the same either 
way. 73,tom n4zpt

On 6/1/2011 2:48 AM, Kevin Deane wrote:
>
>
>
> Is that normal?? If anyone was watching that is...
>
> Kevin

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[amsat-bb] Re: G5500 change voltage supply

[i8cvs]

- Original Message -
From: "Juan Antonio Fernandez" 
To: 
Sent: Wednesday, June 01, 2011 11:04 AM
Subject: [amsat-bb] G5500 change voltage supply

> I have purchased a G5500.  The control box have a 117Vac label  in the
> real panel.  I opened it and a wire is connected through the fuse to the
> terminal number 3 of the KT-30 transformer and the other wire through the
> main switch to the terminal number 1 of the KT-30 transformer.
>
> I am wondering how I should connect it to work with 220Vac in Europe.
>
> Thanks in advance. ea4...@amsat.org

Hi Juan Antonio, EA4CYQ

Happy to hear from you again ! How many wires comes out from the primary
winding of the KT-30 transformer ?

If the primay winding of KT-30 transformer has only two wires the number
3 and the number 1 then it has been winded to work only with 117 Vac
and in this case you need an external autotransformer 220/117 to supply
the control box.

On the reversed side if the primary winding of the KT-30 transformer has
four wires it means that the primary has been made with two separate
windings of 117 Vac each so that is you connect two windings in parallel
you can supply it with 117 Vac and if you connect two windings in series
with the correct phase relationship you can supply it with 220 Vac

Best 73" de

i8CVS Domenico




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[amsat-bb] Re: Thrust bearing maintenance

[Howard Kowall]

Hello Steve
What I have done in the past
Is to degrease it all and before assembly,drill and tap grease nipples in 
the housing,just make sure you clean all the filings before assembly.Then 
for regular maintenance you just have to give them a small shot of grease 
with a regular grease gun.
Just a suggestion
Good luck
Howard
VE4ISP
- Original Message - 
From: "Stephen E. Belter" 
To: 
Sent: Wednesday, June 01, 2011 7:19 AM
Subject: [amsat-bb] Thrust bearing maintenance


>I have an Yaesu GS-050 thrust bearing that has been installed for about 15 
>years.  The thrust bearing turns, but requires a lot of force.
>
> I disassembled the thrust bearing to find that the grease is very sticky 
> (think candy apple sticky), and not lubricative (if that is a word).
>
> Should I take it to an auto repair shop and ask them to degrease and then 
> lubricate similar to repacking a wheel bearing?
>
> What kind of grease should be used?
>
> Thanks and 73, Steve N9IP
> --
> Steve Belter
>
>
>
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[amsat-bb] Re: Thrust bearing maintenance

[Stan, W1LE]

Hello Steve,

15 years outside in the weather is a long time. Options:

1. replace in kind with a new unit. Probably the most time effective and 
cost effective approach.
The new one should last another 15+ years.

2. Soak the old unit in a solvent to loosen up all of the old grease and 
flush dirt out.
Disassemble and inspect the bearings and bearing surfaces.
  This unit is foreign made so all hardware is probably metric, as are 
the ball bearings.
Clean each ball bearing and inspect for out of roundness and 
pitting/corrosion.
How does each bearing roll on a hard surface ?  Replace all pitted 
bearings and all out of round.
Good luck finding metric bearings, Yes, they are out there. Maybe Yaesu 
has a rebuild kit.
Inspect the bearing surfaces for gouging and other wear. Assemble with 
all new parts.
Be sure to grease all of the hardware threads.
Do not expect the rebuilt old unit to be as mechanically tight as a new 
unit.
Probably lots more sloppiness in the fit.
After rebuild, is there is any binding no matter how light, condemn the 
unit.

As you can see, buying a new unit is the most cost effective and time 
effective alternative.
I just replaced a ROHN TB3 thrust bearing on my main tower, with a new unit.

Good Luck with the project.

Stan, W1LE  Cape CodFN41sr



On 6/1/2011 8:19 AM, Stephen E. Belter wrote:
> I have an Yaesu GS-050 thrust bearing that has been installed for about 15 
> years.  The thrust bearing turns, but requires a lot of force.
>
> I disassembled the thrust bearing to find that the grease is very sticky 
> (think candy apple sticky), and not lubricative (if that is a word).
>
> Should I take it to an auto repair shop and ask them to degrease and then 
> lubricate similar to repacking a wheel bearing?
>
> What kind of grease should be used?
>
> Thanks and 73, Steve N9IP
> --
> Steve Belter
>   
>
>
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[amsat-bb] AO51

[wa4hfn]

Did not hear AO51 this morning 12.13 utc   150/880?
WA4HFN em55
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[amsat-bb] Re: [sarex] Re: ISS to be reboosted June 3rd

[Alan P. Biddle]

Justin,

Actually, the orbit is holding up pretty well for AO-51.  The ISS is big
enough, and low enough, that drag is a significant factor.  Drag is
_roughly_ 200 times higher for the ISS than AO-51.  Even ARISSat-1, which
will start at the ISS orbit, will have a lifetime of much less than a year.
There is a good article on this in the latest AMSAT Journal.

What we really need is for the Energizer Bunny to stop by and swap out the
batteries.  And while he is at it, he can stop by a couple of other
satellites and tap on them with a hammer to free up some stuck relays.

73s,

Alan
WA4SCA


-Original Message-
From: sarex-boun...@amsat.org [mailto:sarex-boun...@amsat.org] On Behalf Of
Justin Pinnix
Sent: Tuesday, May 31, 2011 8:41 AM
To: apbid...@mailaps.org
Cc: AMSAT-BB; SAREX-BB
Subject: [sarex] Re: [amsat-bb] ISS to be reboosted June 3rd

Do you think that if we asked real, real, nicely they'd go boost AO-51 for
us while they're up there?  :-)

Just kidding - I know the reasons why this could never realistically be
done.  But it does give me a great deal of appreciation for how reliable a
satellite can be when someone else is doing the stationkeeping work for us
who has resources beyond what we could ever imagine.

73 de AJ4MJ
On Tue, May 31, 2011 at 8:28 AM, Alan P. Biddle  wrote:

> According to Roscosmos, the ISS will have its orbit raised 3.74 km Friday.
> This will result in a "slippage" of predicted times of approximately 70
> seconds per day until the Keps catch up.  The AMSAT NASA.ALL Keps will
> probably not reflect this until next week, so be certain to update from
> Celstrak or Space Track.
>
> http://www.federalspace.ru/main.php?id=2&nid=11848&lang=en
>
> 73s,
>
> Alan
> WA4SCA
>
>
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[amsat-bb] Thrust bearing maintenance

[Stephen E. Belter]

I have an Yaesu GS-050 thrust bearing that has been installed for about 15 
years.  The thrust bearing turns, but requires a lot of force.  

I disassembled the thrust bearing to find that the grease is very sticky (think 
candy apple sticky), and not lubricative (if that is a word).  

Should I take it to an auto repair shop and ask them to degrease and then 
lubricate similar to repacking a wheel bearing?  

What kind of grease should be used?

Thanks and 73, Steve N9IP
--
Steve Belter



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[amsat-bb] G5500 change voltage supply

[Juan Antonio Fernandez]

I have purchased a G5500.  The control box have a 117Vac label  in the real
panel.  I opened it and a wire is connected through the fuse to the terminal
number 3 of the KT-30 transformer and the other wire through the main switch
to the terminal number 1 of the KT-30 transformer.

I am wondering how I should connect it to work with 220Vac in Europe.

Thanks in advance. ea4...@amsat.org
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[amsat-bb] Re: Flames on Endeavor

[STeve Andre']

On 06/01/11 02:48, Kevin Deane wrote:
>
>
> Is that normal?? If anyone was watching that is...
>
> Kevin
>   
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Yes, it's the APU, I think.

--STeve Andre'
wb8wsf  en72

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[amsat-bb] Flames on Endeavor

[Kevin Deane]

 
 
Is that normal?? If anyone was watching that is...
 
Kevin
  
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