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Hi
I am looking in to building a repeater. I have a Motorola Mitrek and
have seen some articles on using a single radio to build a repeater but
the instructions are not very clear. The Mitrek that I have is all setup
and working, I am now using it as a voice radio to talk to only one
repeater. It is just the setting up the radio as a repeater and the
connections for the controller and things like that. I am also looking
for a controller and it has to be inexpensive. I don't need phone patch,
or voice ID, but will need to have at least two radio ports and will
need the manuals also. Another thing that I am looking for are duplexers
but for now will not need them.

If anyone can help let me know and where to get more information.

Thanks
Norm
VE5VY

Norm,
Here are some internet sites regarding repeater mods to
Motorola and GE radios:





and some good controllers at:


73,
Mike, WB6CSH

From: Norman Dyck <n.dyck@...>

Hi
I am looking in to building a repeater. I have a Motorola

Mitrek and

have seen some articles on using a single radio to build a

repeater but

the instructions are not very clear. The Mitrek that I have

is all setup

and working, I am now using it as a voice radio to talk to

only one

repeater. It is just the setting up the radio as a repeater

and the

connections for the controller and things like that. I am

also looking

for a controller and it has to be inexpensive. I don't need

phone patch,

or voice ID, but will need to have at least two radio ports

and will

need the manuals also. Another thing that I am looking for

are duplexers

but for now will not need them.

If anyone can help let me know and where to get more

information.

Thanks
Norm
VE5VY

Hi
I am looking in to building a repeater. I have a Motorola Mitrek and
have seen some articles on using a single radio to build a repeater but
the instructions are not very clear. The Mitrek that I have is all setup
and working, I am now using it as a voice radio to talk to only one
repeater. It is just the setting up the radio as a repeater and the
connections for the controller and things like that. I am also looking
for a controller and it has to be inexpensive. I don't need phone patch,
or voice ID, but will need to have at least two radio ports and will
need the manuals also. Another thing that I am looking for are duplexers
but for now will not need them.

Don't know about any articles but I've used a few Mitreks in our repeater
network. I've found the low band UHF Mitrks relatively easy to obtain and
we've used a few as linking radios in the Wild Rose Network. The radios were
originally on 413 Mhz or there abouts and I've been able to tune them up on
440 Mhz.
What I've been doing is chopping out the UHF connector thats on front of the
radio. The connector body contains the antenna relay. Going into the
connector body is 2 teflon covered co-axs. I've been cutting off the connector
body. I drill a couple of holes in the side of the radio just big enough to pass
the co-ax keepng as much separation between the 2 co-axs. I put BNC
female connectors on the pig tails coming out of the radio (my cheat to keep
separation between receive and transmit.signals). I don't have the Motorola
manuals handy but there is a diode on the interface printed circuit board right
at the left end when looking at the radio from the front that has to be removed.
That permits the receiver to work when the transmitter is keyed. Also a
transistor that supplies keyed 9 volts for the receive crystal oscillator is
removed and a jumper is placed in its place from emitter to collector. This
makes sure the receive crystal oscillator is running continuously. There is a
560 ohm resistor on the microphone input that supplies bias voltage for the
amplified microphone that I remove. I don't use the harness / control head but
jumper connections behind the system plug to strap channel 1 plus the
ignition wire. I attach my battery leads directly to pins 17 and 19 on the
system plug.. I make up a little interface board that goes inside the radio and
mount a DB9 connector to the side of the radio. The board has an op amp
such as an LM324 and an analog gate (4066). I pick up the squelch signal
(across a 150 ohm resistor thats on the emitter of the squelch transistor that
switches squelch to the 2 audio power I.C.s. and feed it into one op amp
wired as a comparator to generate the COS signal. I pick up discriminator
audio and feed it into another op amp circuit set up to give about a gain of 10.
I use the COS signal to control one of the gates in the 4066 which gates the
discriminator audio. I wire the gated receive audio, COS, microphone audio
and PTT into the DB9 connector. I wire the DB9 to mate to Link-Com RLC-1.
(actually the DB9 connector is common to all of the Link-Com controllers.
We use the Link-Com controllers extensively in our network. The RLC-1 is
the simplest controller that Link-Com offers. It has 2 ports that can be used
as 1 repeater and full duplex linking port or 2 repeater ports. It has no voice or
phone patch but has 4 analog telemetry channels. The RLC-1 is very low
current (typically 36 ma) and seems to stand up to the harsh enviroment of
mountain top repeater sites. We use the RLC-1 controllers to monitor
voltages and temperatures of our mountain top repeater sites. The Mitreks
are a bit of a current hog for solar powered repeater sites (260 ma standby
current, reducing to about 200 ma when the 2 audio output I.C.s are removed)
but otherwise work well. Once the radio has been converted and hooked up to
the controller it can be changed from a full duplex link radio to a repeater just
by bashing in the appropriate DTMF commands to the radio. The RLC-1 does
have a serial data port on it. I've re-programmed a few RLC-1s at the
mountaintop repeater sites by packing up a lap-top computer with me and re-
programming the controller on the spot.
We standarised on the Link-Com controllers but I am sure there are other
simple controllers that can be used in your aplication.
Walter
VE6ANI
Wild Rose Network
HOME PAGE

We use the Link-Com controllers extensively in our network. The RLC-1 is
the simplest controller that Link-Com offers. It has 2 ports that can be used
as 1 repeater and full duplex linking port or 2 repeater ports. It has no voice or

Walter, I am in the process of using a Mitrek and an RLC-1. It sounds like your
using CSQ on the repeater. Have you tried using the Mitrek PL board with the RLC-1 on
any other repeaters?

I have heard the Mitrek squelch circuit is terrible. Guess I'll have to see for
myself.

73's, Randy, WB0VHB

Walter, I am in the process of using a Mitrek and an RLC-1. It sounds like
your
using CSQ on the repeater. Have you tried using the Mitrek PL board with
the RLC-1 on
any other repeaters?

The Com Spec TS-32 works fine and easier to find.

I have heard the Mitrek squelch circuit is terrible. Guess I'll have to see
for
myself.

We have been using Mitreks for UHF links, and I just epoxy a 25K, 10 turn
pot on the outside of the front Motorola plug shell. Squelch works fine.

de Joe WB6HRO

We use TS-32 tone boards on our repeaters. So far we haven't been using
CCTCS on our links, just on our drop repeaters. We use 100 Hz encode and
decode on our network repeaters. Some of our stand-alone repeaters use
various tones. I haven't figured out how to make the Mitrek boards encode
and decode at the same time.
The squelch on the Mitrek radios isn't so hot, long squelch tails. Link-Com
offers a Motorola Squelch/cos board that can be added to just about any fm
radio. That board has the double squelch system, instant squelch release on
strong signals and a squelch that follows weak signals right into the noise.
We've used that board on some of our repeaters. That board connects right to
the discriminator output in the radio. Big improvement over the stock Mitrek
squelch.

Walter
VE6ANI
Home Page

Walter Isaacson wrote:

From: "Walter Isaacson" <isaacow@...>

Walter, I am in the process of using a Mitrek and an RLC-1. It sounds like
your
using CSQ on the repeater. Have you tried using the Mitrek PL board with
the RLC-1 on
any other repeaters?

The Com Spec TS-32 works fine and easier to find.

I have heard the Mitrek squelch circuit is terrible. Guess I'll have to see
for
myself.

We have been using Mitreks for UHF links, and I just epoxy a 25K, 10 turn
pot on the outside of the front Motorola plug shell. Squelch works fine.

de Joe WB6HRO

We use TS-32 tone boards on our repeaters. So far we haven't been using
CCTCS on our links, just on our drop repeaters. We use 100 Hz encode and
decode on our network repeaters. Some of our stand-alone repeaters use
various tones. I haven't figured out how to make the Mitrek boards encode
and decode at the same time.
The squelch on the Mitrek radios isn't so hot, long squelch tails. Link-Com
offers a Motorola Squelch/cos board that can be added to just about any fm
radio. That board has the double squelch system, instant squelch release on
strong signals and a squelch that follows weak signals right into the noise.
We've used that board on some of our repeaters. That board connects right to
the discriminator output in the radio. Big improvement over the stock Mitrek
squelch.

Walter
VE6ANI

Here also is information on building a quality squelch system for the Mitrek
radio.



Kevin

Here also is information on building a quality squelch system for the Mitrek
radio.



Kevin

Thanks. Some 8 years ago or so I was trying to come up with a better
squelch/COS board. I breadboarded some circuits but wasn't happy with the
results. I sure tried to get my hands on one of those Motorola squelch IC's,
M7716/M6709 but none of the suppliers in the Calgary area could help me.
Eventually we cheated. One member of our group ended up buying an ex-
RCMP Micor 100 watt repeater and that repeater is our main repeater here in
Calgary. A rather expensive way to solve our squelch problem. <grin>

I just checked Link-Comm's page to see if they still carried that squelch/COS
board but I didn't see it on their page.
For those that would like to check Link-Comm's page themselves its


Walter
VE6ANI
Home Page:

Walter Isaacson wrote:

I just checked Link-Comm's page to see if they still carried that
squelch/COS board but I didn't see it on their page.
For those that would like to check Link-Comm's page themselves its

That's odd. I've always used

In any case, not to take anything away from Link Comm, but why not spend
50 bucks on an audio delay board from S*Com? Strong signal or weak - no
squelch crash. :) From what I recall, the RLC-SQL was (is) more than
that and only reduces the crash on strong signals.

Joe, KR3P

That's odd. I've always used

In any case, not to take anything away from Link Comm, but why not spend
50 bucks on an audio delay board from S*Com? Strong signal or weak - no
squelch crash. :) From what I recall, the RLC-SQL was (is) more than
that and only reduces the crash on strong signals.

Thats what I have in my bookimarks. It puts you directly on their catalog
page. Mind you that bookmark is 3 years old.
We use the RLC audio delay boards. The audio delay boards doesn't address
the problem of weak and fluttery signals.
So far we use the audio delay boards here in Calgary. We use them on our
RLC-2A. We also use a few RLC-4s

Walter
VE6ANI
Home Page:

Same Hear , not to take anything from anybody but i have found the NHRC DAD to
work well take a look at



Walter Isaacson wrote:

From: "Walter Isaacson" <isaacow@...>

That's odd. I've always used

In any case, not to take anything away from Link Comm, but why not spend
50 bucks on an audio delay board from S*Com? Strong signal or weak - no
squelch crash. :) From what I recall, the RLC-SQL was (is) more than
that and only reduces the crash on strong signals.

Thats what I have in my bookimarks. It puts you directly on their catalog
page. Mind you that bookmark is 3 years old.
We use the RLC audio delay boards. The audio delay boards doesn't address
the problem of weak and fluttery signals.
So far we use the audio delay boards here in Calgary. We use them on our
RLC-2A. We also use a few RLC-4s

Walter
VE6ANI
Home Page:

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