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Re: UHF Motorola Mitrek mobile?

John Lloyd
 

Gary,

The Mitreks are easy to modify for repeater service. You will need to reduce the
TX Power output since the heatsink is small. You will need to make a shield over
the Channel Elements to get more Tx to Rx isolation. I will look up my notes and
send them to you later on my duplex mods to the mitrek.

John Lloyd, K7JL

Utah VHF Society
--------------------

w7ntf@... wrote:

From: w7ntf@...

Greetings,
This is Gary, W7N TF, in Spanaway, WA. I have two UHF Motorola Mitrek mobiles
that I was going to convert to repeater service before I got ahold of my GE
Mastr-II mobiles. I may still go ahead and finish the project and keep a
Mitrek for a backup repeater. Has anyone successfully converted a UHF Mitrek
mobile for repeater service? Was it difficult, and what problems did you
encounter? I bought a pair of rocks for one of my UHF repeater frequencies
and found that one of the two Mitreks fails to transmit... The other transmits
and receives ok, but still requires an alignment. I am looking for TXA, RXA,
COS, and PTT connections in order to interface with my LinkComm RLC-2A or
RLC-1 Plus controllers. I'd like to hear from you... Thanks.

73, de Gary, W7NTF

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Re: Cushman CE6A service monitor?

Loehrig, Robert (HT-EX)
 

Gary,

Try Triton Electronics Inc. in Rolling Meadows IL.
They do repairs, alignments and calibration.
I purchased the service manual (thick as a phonebook) on a CE6 from them
about a year ago for about $75.



Good Luck.

Bob Loehrig

-----Original Message-----
From: w7ntf@... [SMTP:w7ntf@...]
Sent: Thursday, February 25, 1999 11:18 AM
To: repeater-builder@...
Subject: [repeater-builder] Cushman CE6A service monitor?

From: w7ntf@...


Greetings,
I have a Cushman CE6A service monitor which would prove extremely helpful
in
my repeater projects. Unfortunately, my service monitor is in need of
repair.
Additionally, I do not have any kind of manuals for the CE6A. Does anyone
know
of a reputable company that could restore my CE6A to operation, align to
factory spec, and possibly also provide me with at least an operator or
users
manual?

The symptoms are that the service monitor loses lock on highband VHF and
is
completely unusable. Additionally, it works very poorly on the other
bands.... Very poor RX sensitivity, low RF output.... etc.

I would be very grateful if someone could point me in the right direction.
Thanks very much.

73, de Gary, W7NTF


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Re: 6 meter repeater..

John Lloyd
 

Tedd,

GE also has a version of the Motorola "extender" for Low Band.

DB Products makes a Low Band Loop Dipole that can be side mounted on a pole
or tower leg. It is a DB-212. They also make a directional antenna with 1
director, the DB-225 for 5 db of gain.
Db's phone number is 800-676-5342.

I would run around 50 watts with that PA. Your Transmitter duty cycle will
depend on how hot the PA gets.
You will need to check your system for desense when you get it all hooked
up. Reduce your power until the desense goes away! Or add more isolation to
your duplexer or use split antennas.


John Lloyd, K7JL

----------------------
Tedd Doda wrote:

From: "Tedd Doda" <lazer@...>

Hi John:

On Thu, 25 Feb 1999 01:22:02 -0500, John Hackman wrote:

I expect GE has something
similar, but I don't know what it's called. This will make a very great
difference in the operation of your repeater.
How do I find out? I used the Mitrek on 52.525 with a bunch
of computers in the area, and found it to be quite quiet. My
Alinco DR-M06 is horrible at noise rejection on the other
hand. Both radios hooked to the same antenna (not at the
same time, hi!) shows the Mitrek has a fantastic Receiver.

From all the replies I received, I get the impression that
either the Master II or the Mitrek will work well.

A couple other questions.....

I purchased a commercial 1/4 wave ground plane antenna. From
experience, will this suffice for the repeater, or should I
look around for a better solution? The antenna will be mounted
about 140 feet above ground feed with 1 5/8" heliax. I've been
looking around but can't find any side mounted dipoles for 6m.
Is there some other design I should look at.

The DB product duplexor has been tuned up and I got about
91 Db isolation from TX to RX. What would you recommend for
maximum TX power, to keep desence to a minimum? After visiting
the Master II mods page, they said that the transmitter doesn't
like going below 40% of maximum TX power, and it's a 110 watt
unit. Therefore, the minimum power I should set it to is
about 40 to 45 watts. Is that too much?

Ideas?

Tedd Doda CET

packet va3sed@va3sed
e-mail lazer@...

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Re: UHF Motorola Mitrek mobile?

Lou Harris
 

-----Original Message-----
From: w7ntf@... [mailto:w7ntf@...]
Sent: Thursday, February 25, 1999 11:12 AM
To: repeater-builder@...
Subject: [repeater-builder] UHF Motorola Mitrek mobile?


From: w7ntf@...

Greetings,
This is Gary, W7N TF, in Spanaway, WA. I have two UHF Motorola
Mitrek mobiles
that I was going to convert to repeater service before I got
ahold of my GE
Mastr-II mobiles. I may still go ahead and finish the project and keep a
Mitrek for a backup repeater. Has anyone successfully converted a
UHF Mitrek
mobile for repeater service? Was it difficult, and what problems did you
encounter? I bought a pair of rocks for one of my UHF repeater
frequencies
and found that one of the two Mitreks fails to transmit... The
other transmits
and receives ok, but still requires an alignment. I am looking
for TXA, RXA,
COS, and PTT connections in order to interface with my LinkComm RLC-2A or
RLC-1 Plus controllers. I'd like to hear from you... Thanks.

73, de Gary, W7NTF

------------------------------------------------------------------------
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Come visit our new web site and explore a new interest
------------------------------------------------------------------------
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Re: UHF Motorola Mitrek mobile?

Rick Sherman
 

I use one as a portable/emegency repeater. Conversion was fairly easy.
Take a look at


Rick Sherman KM6TI

w7ntf@... wrote:

From: w7ntf@...

Greetings,
This is Gary, W7N TF, in Spanaway, WA. I have two UHF Motorola Mitrek mobiles
that I was going to convert to repeater service before I got ahold of my GE
Mastr-II mobiles. I may still go ahead and finish the project and keep a
Mitrek for a backup repeater. Has anyone successfully converted a UHF Mitrek
mobile for repeater service? Was it difficult, and what problems did you
encounter? I bought a pair of rocks for one of my UHF repeater frequencies
and found that one of the two Mitreks fails to transmit... The other transmits
and receives ok, but still requires an alignment. I am looking for TXA, RXA,
COS, and PTT connections in order to interface with my LinkComm RLC-2A or
RLC-1 Plus controllers. I'd like to hear from you... Thanks.

73, de Gary, W7NTF

------------------------------------------------------------------------
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Come visit our new web site and explore a new interest
------------------------------------------------------------------------
This list is sponsored by the owners and users of "RBTIP"
Re: UHF Motorola Mitrek mobile?

Bill Anderson WB9TEW
 

Gary,
Check out the repeater pages at the following.
www.seits.org
Bill

w7ntf@... wrote:

From: w7ntf@...

Greetings,
This is Gary, W7N TF, in Spanaway, WA. I have two UHF Motorola Mitrek mobiles
that I was going to convert to repeater service before I got ahold of my GE
Mastr-II mobiles. I may still go ahead and finish the project and keep a
Mitrek for a backup repeater. Has anyone successfully converted a UHF Mitrek
mobile for repeater service? Was it difficult, and what problems did you
encounter? I bought a pair of rocks for one of my UHF repeater frequencies
and found that one of the two Mitreks fails to transmit... The other transmits
and receives ok, but still requires an alignment. I am looking for TXA, RXA,
COS, and PTT connections in order to interface with my LinkComm RLC-2A or
RLC-1 Plus controllers. I'd like to hear from you... Thanks.

73, de Gary, W7NTF

------------------------------------------------------------------------
Did you know that we have over 85,000 e-mail communities at Onelist?

Come visit our new web site and explore a new interest
------------------------------------------------------------------------
This list is sponsored by the owners and users of "RBTIP"
Re: 6 meter repeater..

John Lloyd
 

Tedd,

The Mastr II solid state is a much better radio for repeater use. You could
use one of the others, but I would choose the Mastr II.

John, K7JL
---------------

Tedd Doda wrote:

From: "Tedd Doda" <lazer@...>

Hi People:

I'm looking for information on modifing either a tube final
GE Master, or a mobile Canadian GE MC74XC833A (100 watt mobile,
Master II I think?)for repeater use.

Which would be the better choice?

I also have a Mitrek...would this be better for use in a
repeater?

This is my first 6 meter repeater project, and I would like
to hear any thoughts on what to use. I have DB products
duplexor (6 can helical resonator, notch) to use and is
all tuned up and ready to go. All I have to figure out
is what radio to use and how to modify it for duplex
operation.

Thanks kindly,

Tedd Doda CET

packet va3sed@va3sed
e-mail lazer@...

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Re: UHF Motorola Mitrek mobile?

[email protected]
 

Hello John,
Thanks very much for your assistance. I really appreciate your quick response.
It would be great to put my Mitreks into service. They've been gathering dust
for quite some time. I'll look forward to hearing from you soon.

73, de Gary, W7NTF
Re: Cushman CE6A service monitor?

[email protected]
 

Hi Bob,
Thanks very much for your assistance. I'll check them out.

73, Gary, W7NTF
Re: 6 meter repeater..

Tedd Doda
 

Hi John:

On Thu, 25 Feb 1999 01:22:02 -0500, John Hackman wrote:

I expect GE has something
similar, but I don't know what it's called. This will make a very great
difference in the operation of your repeater.
How do I find out? I used the Mitrek on 52.525 with a bunch
of computers in the area, and found it to be quite quiet. My
Alinco DR-M06 is horrible at noise rejection on the other
hand. Both radios hooked to the same antenna (not at the
same time, hi!) shows the Mitrek has a fantastic Receiver.

From all the replies I received, I get the impression that
either the Master II or the Mitrek will work well.

A couple other questions.....

I purchased a commercial 1/4 wave ground plane antenna. From
experience, will this suffice for the repeater, or should I
look around for a better solution? The antenna will be mounted
about 140 feet above ground feed with 1 5/8" heliax. I've been
looking around but can't find any side mounted dipoles for 6m.
Is there some other design I should look at.

The DB product duplexor has been tuned up and I got about
91 Db isolation from TX to RX. What would you recommend for
maximum TX power, to keep desence to a minimum? After visiting
the Master II mods page, they said that the transmitter doesn't
like going below 40% of maximum TX power, and it's a 110 watt
unit. Therefore, the minimum power I should set it to is
about 40 to 45 watts. Is that too much?

Ideas?


Tedd Doda CET

packet va3sed@va3sed
e-mail lazer@...
Cushman CE6A service monitor?

[email protected]
 

Greetings,
I have a Cushman CE6A service monitor which would prove extremely helpful in
my repeater projects. Unfortunately, my service monitor is in need of repair.
Additionally, I do not have any kind of manuals for the CE6A. Does anyone know
of a reputable company that could restore my CE6A to operation, align to
factory spec, and possibly also provide me with at least an operator or users
manual?

The symptoms are that the service monitor loses lock on highband VHF and is
completely unusable. Additionally, it works very poorly on the other
bands.... Very poor RX sensitivity, low RF output.... etc.

I would be very grateful if someone could point me in the right direction.
Thanks very much.

73, de Gary, W7NTF
UHF Motorola Mitrek mobile?

[email protected]
 

Greetings,
This is Gary, W7N TF, in Spanaway, WA. I have two UHF Motorola Mitrek mobiles
that I was going to convert to repeater service before I got ahold of my GE
Mastr-II mobiles. I may still go ahead and finish the project and keep a
Mitrek for a backup repeater. Has anyone successfully converted a UHF Mitrek
mobile for repeater service? Was it difficult, and what problems did you
encounter? I bought a pair of rocks for one of my UHF repeater frequencies
and found that one of the two Mitreks fails to transmit... The other transmits
and receives ok, but still requires an alignment. I am looking for TXA, RXA,
COS, and PTT connections in order to interface with my LinkComm RLC-2A or
RLC-1 Plus controllers. I'd like to hear from you... Thanks.

73, de Gary, W7NTF
Re: 6 meter repeater..

John Hackman
 

Actually, at 6M receiver sensitivity is not an issue unless there's been a
lightning strike - the real thing to look for is, which if either unit has
an RF noise blanker? The Motorola "Extender" is a terrific noise blanker
that will remove all but the most horrendous of impulse noises that
otherwise would destroy weaker received signals. I expect GE has something
similar, but I don't know what it's called. This will make a very great
difference in the operation of your repeater.

Regards,

.........John WB4VVA

-----Original Message-----
From: Tedd Doda <lazer@...>
To: repeater-builder@... <repeater-builder@...>
Date: Wednesday, February 24, 1999 6:09 PM
Subject: [repeater-builder] Re: 6 meter repeater..


From: "Tedd Doda" <lazer@...>

On Wed, 24 Feb 1999 14:34:41 -0500, John Hackman wrote:

I'd use the Mitrek - why beat your brains out building fan cooling, etc.
for
the GE's and then have the recurring expense of replacing the driver and
final tubes? In addition, the mobile power supplies are intermittent duty,
so you'll have to build a high voltage power supply, as opposed to hooking
up a deep cycle marine battery and an el cheapo battery charger to the
Mitrek.
That's the kind of information I was after. I thought having
tube outputs would make it tougher? Only the old Master (1?)
base unit has tubes, the Master II (mobile) is solid state.

Any comment on RX sensitivity over the Master II, and the Mitrek?
The donor Master II is still on 42.something, so I can't
really do a fair evaluation, unless they are both inband,
but I don't want to waist time (money) on rocking the MasterII
if the Mitrek is more sensitive.

Thanks for the help...


Tedd Doda CET

packet va3sed@va3sed
e-mail lazer@...



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Re: For sale

David Armstrong
 

David Armstrong KF4LJR
Technical Advisor, Southeastern, Division
440 Plunkett Dr.
Horton, Al 35980
205-593-5321 home of the 443.725 Repeator an 53.030

How much an does it work, for the uhf master ll no pa?
How much for the johnson amp? Does it work? If you like you
can e-mail me here. kf4ljr@...

**

----------
From: Brent DeSalvo KF4TNP <Bug1@...>
To: repeater@...; repeater-builder@...; eddie
<wa4qkc@...>
Subject: [repeater-builder] For sale
Date: Friday, March 05, 1999 1:56 PM

From: Brent DeSalvo KF4TNP <Bug1@...>

Have For Sale ::::

Ge Master II UHF Mobile (no PA)

Ge Master II VHF mobile pa

443.125 repeater with RC-100 Controller card
no duplexer

442.100 repeater with no controller
no duplexer

Ge master II vhf front end

Ge control cards, and repeater cards, tone cards etc..

motorola Micor low band mobile

motorola mitrek UHF mobile 100 watts

Johnson Challenger uhf mobile

Johnson UHF 70 watt repeater amp
Re: 6 meter repeater..

Tedd Doda
 

On Wed, 24 Feb 1999 14:34:41 -0500, John Hackman wrote:

I'd use the Mitrek - why beat your brains out building fan cooling, etc. for
the GE's and then have the recurring expense of replacing the driver and
final tubes? In addition, the mobile power supplies are intermittent duty,
so you'll have to build a high voltage power supply, as opposed to hooking
up a deep cycle marine battery and an el cheapo battery charger to the
Mitrek.
That's the kind of information I was after. I thought having
tube outputs would make it tougher? Only the old Master (1?)
base unit has tubes, the Master II (mobile) is solid state.

Any comment on RX sensitivity over the Master II, and the Mitrek?
The donor Master II is still on 42.something, so I can't
really do a fair evaluation, unless they are both inband,
but I don't want to waist time (money) on rocking the MasterII
if the Mitrek is more sensitive.

Thanks for the help...


Tedd Doda CET

packet va3sed@va3sed
e-mail lazer@...
Re: 6 meter repeater..

Tedd Doda
 

On Wed, 24 Feb 1999 04:45:45 -0500, edriddle wrote:

the ge master II is the best choice i think. look on the web as there is a
complete set of instructions to modify your rsdio. also look up the nhrc
repeater controller. if you just search yahoo for nhrc it will come up and
i think there is a link to the ge master II
Thanks Ed. The sites address is:

Great stuff, and it looks very easy to do the mod's.

The Master II is tuned up on 52.525, so it shouldn't
take much to get it up to 53.27 (-1 Mhz).


Tedd Doda CET

packet va3sed@va3sed
e-mail lazer@...
Re: 6 meter repeater..

Ray Vaughan
 

At 04:45 AM 2/24/99 -0500, you wrote:
From: edriddle <edriddle@...>

the ge master II is the best choice i think. look on the web as there is a
complete set of instructions to modify your rsdio. also look up the nhrc
repeater controller. if you just search yahoo for nhrc it will come up and
i think there is a link to the ge master II
To be exact:



The Mastr II link is at the bottom.

Ray J. Vaughan, MS, CBTE
KD4BBM
ray@...
System Maintenance and Upgrade

Kevin K. Custer W3KKC
 

Hello,

ONElist will be down for system upgrades Wednesday evening, from 8 pm to

11 pm Pacific Time. We are increasing our server capacity to keep up
with
our ever increasing user base. We apologize for the inconvenience.

Forwarded by:
Kevin Custer,
The list owner
Re: 6 meter repeater..

John Hackman
 

I'd use the Mitrek - why beat your brains out building fan cooling, etc. for
the GE's and then have the recurring expense of replacing the driver and
final tubes? In addition, the mobile power supplies are intermittent duty,
so you'll have to build a high voltage power supply, as opposed to hooking
up a deep cycle marine battery and an el cheapo battery charger to the
Mitrek.

Regards,

.......John WB4VVA

-----Original Message-----
From: Tedd Doda <lazer@...>
To: Repeater list <repeater-builder@...>
Date: Wednesday, February 24, 1999 12:47 PM
Subject: [repeater-builder] 6 meter repeater..


From: "Tedd Doda" <lazer@...>

Hi People:

I'm looking for information on modifing either a tube final
GE Master, or a mobile Canadian GE MC74XC833A (100 watt mobile,
Master II I think?)for repeater use.

Which would be the better choice?

I also have a Mitrek...would this be better for use in a
repeater?

This is my first 6 meter repeater project, and I would like
to hear any thoughts on what to use. I have DB products
duplexor (6 can helical resonator, notch) to use and is
all tuned up and ready to go. All I have to figure out
is what radio to use and how to modify it for duplex
operation.

Thanks kindly,


Tedd Doda CET

packet va3sed@va3sed
e-mail lazer@...



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6 meter repeater..

Tedd Doda
 

Hi People:

I'm looking for information on modifing either a tube final
GE Master, or a mobile Canadian GE MC74XC833A (100 watt mobile,
Master II I think?)for repeater use.

Which would be the better choice?

I also have a Mitrek...would this be better for use in a
repeater?

This is my first 6 meter repeater project, and I would like
to hear any thoughts on what to use. I have DB products
duplexor (6 can helical resonator, notch) to use and is
all tuned up and ready to go. All I have to figure out
is what radio to use and how to modify it for duplex
operation.

Thanks kindly,


Tedd Doda CET

packet va3sed@va3sed
e-mail lazer@...
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