I've heard rumors of a mod for the GM300/Radius mobiles to take them down to
2w, like the LPI M04xxx models. I'd think this would probably be to convert an
M34xxx 25w radio. Can this be done, and if so, is there any info available on
how to do it?
Thanks,
Brian, N4BWP
Had anyone done this modification, or know of any information available on it.
I have been told that Australia has a version of the gm300 that does the 220
band, but they are impossible to find stateside as they are not fcc type
approved.
Had anyone done this modification, or know of any information available on it.
I have been told that Australia has a version of the gm300 that does the 220
band, but they are impossible to find stateside as they are not fcc type
approved.
On Jul 2, 2009, at 12:56 AM, Scott Yeager wrote:
Wow, if this is attempting to be nice I can't even imagine what your
idea of rude is.
Which part of my message was rude? Did you fall into the common
mistake that humans reading e-mails that are long think there's more
emotional content
is the reflected on
the unit? What kind of duplixer do you have?
John
- Original Message -
From: Nate Duehr
To: Repeater-Builder@yahoogroups.com
Sent: Saturday, July 04, 2009 5:16 PM
Subject: Re: [Repeater-Builder] GM300 Crossband Ham repeater Bi-Directional
On Jul 2
also this range on the repeater is with a HT at 5 watts.
- Original Message -
From: Maire-Radios
To: Repeater-Builder@yahoogroups.com
Sent: Saturday, July 04, 2009 6:28 PM
Subject: Re: [Repeater-Builder] GM300 Crossband Ham repeater Bi-Directional
well I have
, 2009 6:51 PM
Subject: Re: [Repeater-Builder] GM300 Crossband Ham repeater Bi-Directional
The UHF Radio I have is rated at 25 watts according to RSS but I'd like to
attempt turning the output power down to around 10 watts...
.
:* Tuesday, June 30, 2009 3:42 PM
*Subject:* [Repeater-Builder] GM300 Crossband Ham repeater
Bi-Directional
A little background on what I'm trying to accomplish here;
I'm a member of a Ham radio club but do not live in the city the
club's repeater resides in. Due to the distance
Wow, if this is attempting to be nice I can't even imagine what your idea of
rude is.
Where to start?
Well since I'm a DUE paying member of the club and the repeater belongs to
THE CLUB, I'm part owner of it. This has also been discussed with the club
and received no objection from a majority
-Builder@yahoogroups.com
Sent: Wednesday, July 01, 2009 5:07 PM
Subject: Re: [Repeater-Builder] GM300 Crossband Ham repeater Bi-Directional
...Call the repeater owner of the repeater you're THINKING about doing this
to, and ask their opinion of it. If they say, Please don't do
- Original Message -
From: Nate Duehr mailto:n...@natetech.com
To: Repeater-Builder@yahoogroups.com
Sent: Wednesday, July 01, 2009 5:07 PM
Subject: Re: [Repeater-Builder] GM300 Crossband Ham repeater
Bi-Directional
...Call the repeater owner of the repeater you're THINKING about
@yahoogroups.com
Subject: RE: [Repeater-Builder] GM300 Crossband Ham repeater Bi-Directional
Nate,
With all due respect, following your logic, if one careless mobile user lets
his mic fall down in a seat crack, doesn't realize his PTT is stuck, and
ties up your input for an hour driving through
What you are making is a remote base. Very popular in some areas back in the
60's and 70's.
Chuck
WB2EDV
- Original Message -
From: Scott Yeager
To: Repeater-Builder@yahoogroups.com
Sent: Thursday, July 02, 2009 8:51 PM
Subject: Re: [Repeater-Builder] GM300 Crossband Ham
- Original Message -
From: turboelesjuan
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, June 30, 2009 1:42 PM
Subject: [Repeater-Builder] GM300 Crossband Ham repeater Bi-Directional
A little background on what I'm trying to accomplish here;
I'm a member of a Ham
I will avoid going into the technical and political rant of...
Why cheap mobile cross-band repeaters hooked to my properly
working much more expensive real repeater are bad..., since
we've hashed it out here on this list before, and just say this:
Call the repeater owner of the repeater you're
A little background on what I'm trying to accomplish here;
I'm a member of a Ham radio club but do not live in the city the club's
repeater resides in. Due to the distance away I'm unable to access the
repeater with a handheld radio without the use of a large external antenna and
thats what
have a looksee on ebay, probably going to find one for under $30. Was
going to do that before
I was unable to locate any reasonably prices gm300 or maxtracs around
columbus ga
turboelesjuan wrote:
A little background on what I'm trying to accomplish here;
I'm a member of a Ham radio
There are simple controller cables on ebay for about $10. These seem to work
ok. I use one for uhf with a mobile duplexer as a portable repeater.
Greg
Benjamin L. Naber wrote:
have a looksee on ebay, probably going to find one for under $30. Was
going to do that before
I was unable to
port or ports.
Chris
Kb0wlf
-Original Message-
From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
buil...@yahoogroups.com] On Behalf Of turboelesjuan
Sent: Tuesday, June 30, 2009 2:43 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] GM300 Crossband Ham repeater
have build one same radio's and used 2 Zetron 37.
- Original Message -
From: turboelesjuan
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, June 30, 2009 3:42 PM
Subject: [Repeater-Builder] GM300 Crossband Ham repeater Bi-Directional
A little background on what
I just got my cat-200 controller programed up and i notice some oddities with
my tx audio.
I have a large fan that runs in the cabinet and the radios pick up the noise.
Also , when i am transmitting into the repeater , i can tap on the speakers for
both the tx and rx radio and you can hear the
I just got my cat-200 controller programed up and i notice some oddities with
my tx audio.
I have a large fan that runs in the cabinet and the radios pick up the noise.
Also , when i am transmitting into the repeater , i can tap on the speakers for
both the tx and rx radio and you can hear the
-Builder] GM300 repeater build ?2
I just got my cat-200 controller programed up and i notice some oddities with
my tx audio.
I have a large fan that runs in the cabinet and the radios pick up the noise.
Also , when i am transmitting into the repeater , i can tap on the speakers for
both the tx
Sounds like you may be experiencing the phenomenom known as microphonics.
-That’s what it is take one of the Microphones off --
Sorry I could not resist
My fan use to do that on My Hamtronics 220 Stand By Repeater , I forgot what
I Did to cure it
...@yahoogroups.com] On Behalf Of NORM KNAPP
Sent: Wednesday, May 13, 2009 8:14 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] GM300 repeater build ?2
Sounds like you may be experiencing the phenomenom known as microphonics.
- Original Message -
From: Repeater
i have a question that hasn't been really answered by my searches .I am
building a gm300 repeater for local GMRS usage. Would it be better to open
the squelch on the rcvr and allow the tone to do the muting until it detects
the carrier with proper tone?
Thanks
Keith
N3QAM
kb3ccn wrote:
i have a question that hasn't been really answered by my searches .I
am building a gm300 repeater for local GMRS usage. Would it be
better to open the squelch on the rcvr and allow the tone to do the
muting until it detects the carrier with proper tone?
Thanks Keith N3QAM
Ok , i will leave as it is for now.
- Original Message -
From: wd8chl
To: Repeater-Builder@yahoogroups.com
Sent: Thursday, May 07, 2009 2:51 PM
Subject: Re: [Repeater-Builder] GM300 repeater build
kb3ccn wrote:
i have a question that hasn't been really answered
Am getting desperate to find one! Can someone help? Pls. reply offlist
with details.
Tnx
Jerry VE3 EXT
: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of ve3ext
Sent: Friday, December 05, 2008 6:24 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] GM300 service manual ! mobile radios
Am getting desperate to find one! Can someone help? Pls. reply offlist
At 08:27 PM 03/26/08, you wrote:
- I'm kinda new to this so here it goes -
I have a gm300(tx) linked to m120(rx) as a repeater using a i20r
controller. I would like to have audio from the internal speaker on
the rx side of the repeater.
heres what i have tried:
I have local sound(button
- I'm kinda new to this so here it goes -
I have a gm300(tx) linked to m120(rx) as a repeater using a i20r
controller. I would like to have audio from the internal speaker on
the rx side of the repeater.
heres what i have tried:
I have local sound(button beeps and power
] On Behalf Of Rick T
Sent: Monday, January 14, 2008 1:40 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] GM300 - 433MHz?
Thanks for the info guys... Sounds easy enough.
2nd question Will the DOS programming software work in a DOS window
under XP? I have my
: [EMAIL PROTECTED] [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Sunday, January 13, 2008 12:44:44 PM
Subject: Re: [Repeater-Builder] GM300 - 433MHz?
Remember also while using the shiftmethod to fill in the entire freq area
including the trailing zeros.
Glenn
W8AK
In a message dated 1
: [Repeater-Builder] GM300 - 433MHz?
Hey Rick,
You can format a floppy with / using an old DOS computer, and make a DOS
boot disk. May be able to download one from bootdisks.com. Then insert the
floppy with RSS and run it.
Works for me.
73's
Russ
K4RCC
From: Repeater-Builder
AM
Subject: RE: [Repeater-Builder] GM300 - 433MHz?
It may not run well on that fast of a machine. remember that old DOS software
used clock pulses from the computer for timing. But it might at least be worth
a try. Let us know, Ric, If it DOES work OK that way (DOS boot disk on fast
: [Repeater-Builder] GM300 - 433MHz?
It may not run well on that fast of a machine... remember that old DOS
software used clock pulses from the computer for timing. But it might at
least be worth a try. Let us know, Ric, If it DOES work OK that way
(DOS boot disk on fast machine)!!
I need
Paul,
I guess Im going to have to start prowling the local electronics recycling
events here I see a LOT of people throwing away computers. I should be
able to grab a half-dozen or so and hopefully cobble together at least ONE
working machine, I think. wink
I think I still have an
: w7vtm
To: Repeater-Builder@yahoogroups.com
Sent: Sunday, January 13, 2008 8:00 PM
Subject: [Repeater-Builder] GM300 - 433MHz?
I have a Motorola GM300 that has a frequency range of 438MHz to 470MHz.
Is it possible to program these radios down to 433MHz? Or, how low can
Rick
Kevin is correct - you can try the SHIFT Entry method, except do NOT hold
down the shift key when entering the decimal point. For example, a
frequency of 433.1750 would appear as follows: $##.!%) (notice the
decimal). Should work OK for your application. But Kevin is correct -
check
Remember also while using the shiftmethod to fill in the entire freq area
including the trailing zeros.
Glenn
W8AK
In a message dated 1/13/2008 1:39:58 P.M. Eastern Standard Time,
[EMAIL PROTECTED] writes:
Rick
Kevin is correct – you can try the “SHIFT Entry” method, except do
I have a Motorola GM300 that has a frequency range of 438MHz to 470MHz.
Is it possible to program these radios down to 433MHz? Or, how low can
these radios go?
Thanks,
Rick - W7VTM
Hey Guys,
Great little group you guys have here! Good Stuff!
I am trying to search the messages but it keeps coming up 'server busy'.
I am after a website or specific 'message' where I can fond
information and/or a module to suit the GM300 series radio to creat a
link between two repeaters. I
New To the Group, had a question about the Motorola GM300's before I send
them in to be programmed.
I volunteer with Nicolet Search Team (a volunteer operation that is
non-profit who aid Law Enforcement in Northeast Wisconsin in the Search
for lost/missing persons)
I recently found
$98 to have them set up as a generic repeater is a bit high, there isn't much
to it, fire up the software, change to repeater mode, tell the software it's
a
generic repeater, follow the screens in the software, program the radio's.
The software takes care of the accessory pin configuration,
Okay guys. This is my first repeater project ever. I am not sure if I
have chosen the right equipment or not, but here goes nothing. I have
two Moto GM300 UHF radios that I want to use for the repeater. I have
been looking at the CAT200 controller for the repeater. I have not
found any
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] gm300 with cat200 controller
Okay guys. This is my first repeater project ever. I am not sure if I
have chosen the right equipment or not, but here goes nothing. I have
two Moto GM300 UHF radios that I want to use for the repeater. I
Mike Mullarkey wrote:
Dan,
If you are purchasing a controller use the Link Communications controllers.
RLC-1 or even a RLC-4 is the way I would go.
Mike
Well, let's not get into this-vs-that...
In answer to Dan's question, I have not seen a made-for-amateur
controller that _doesn't_
A quick check of the manual online shows zone 1 channel one to be
repeater transmit What this means (in cat-speak) is that by toggling
this channel back and forth, you can internally make or break the PTT
connection between the repeater and transmitter. That's what you are
looking for. 73 Mike
As someone else already posted, Zone 1, channel 1, is
the repeater enable/disable command. If the controller
is set for default operation, the command 100110 will
turn this channel off, and it won't repeat until you
turn it back on with the command 100111. That's about
the only command you really
Dan - Go www.batlabs.com They have info on the
pinouts of the 16 pin accy. connector. You need
ground from both, of course, Flat audio and COR from
receiver, and PTT and TX audio to the transmitter. You
may also need a pull-up resistor on the COS line,
about 2.5K ohms.
Manual for the Cat 200
Hi All! OK, its silly question time!
Background:
I use a number of UHF Maxtracs for GR300 type operations, links what have
you. I have had no problems programming the little buggers with a pentium
1 233 computer (maybe its a little fast of a computer)
I recent pick up a few UHF GM300's.
I dont think that the speed of your pc hosed that radio. It might just
be a coicendence.
I would wipe all the modes from the radio and make mode 1 a simplex freq
in the middle of the radios bandsplit and test from there..
[EMAIL PROTECTED] wrote:
Hi All! OK, its silly question time!
;
[EMAIL PROTECTED]
Subject: [Repeater-Builder] GM300
programing question
I use a number of UHF Maxtracs for GR300
type operations, links what have you. I have had no problems programming
the little buggers with a pentium 1 233 computer (maybe its a little fast of a
computer)
- snip
Gm 300 does have an internal deviation setting (max
dev )on the rf board side of the radio.
R302 -VCO mod being max dev and R164 pot being Ref
(ctcss)
There is also the squelch pot R60.
I do have some mods for bi-level squelch on these
radios that work just as well (better ) than the Micor
Is there an official procedure for adjusting both R302
and R164? I thought those were set at the factory and
the RSS deviation was supposed to be used in the
field.
Bob M.
==
--- bradley glen [EMAIL PROTECTED] wrote:
Gm 300 does have an internal deviation setting (max
dev )on the rf board
Good Day Bob
Yes these are factory set for the diffrent bandwidths
10/12,5/20/25khz although there is no technical
reason why one can change them in the field to
optimise your system.
What I do is check the RSS settings and make sure they
are roughly in the centre of their software and then
Always laugh, but never reply, but had to this time;
Good one Jeff, had to pick myself up off the floor :)
sorry Andy couldn't resist either!
Randy VE3JPU
On 13-Dec-05, at 5:02 PM, Jeff DePolo WN3A wrote:
Does anyone know which pot in the gm300 adjusts the rx deviation?
Thanks.
Andy KC2GOW
Jeff DePolo WN3A wrote:
The one labeled Volume.
Heard on 11M a few times: Turn up your volume, I can't hear you...
-
You do know that VSWR means 'voice standing wave ratio' right? You have
to make sure your mic cord is the right length. Keep cutting it off, 1/4
inch at a time, till
OK I deserve this ridicule.meant "TX" dev. but oh well. Thanks for the help, thought it might be in the software but did not want to pull it out of the site for nothing.Andy
Yahoo! Shopping
Find Great Deals on Holiday Gifts at Yahoo! Shopping
YAHOO!
] On Behalf Of Andrew G.
Sent: Wednesday, December 14, 2005
4:55 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder]
GM300 Deviation
OK I deserve this ridicule.meant TX
dev. but oh well. Thanks for the help, thought it might be in the software but
did not want to pull it out
If you have a laptop, install RSS on that, bring it to
the site and adjust it there.
Bob M.
==
--- Andrew G. [EMAIL PROTECTED] wrote:
OK I deserve this ridicule.meant TX dev. but
oh well. Thanks for the help, thought it might be in
the software but did not want to pull it out of the
Does anyone know which pot in the gm300 adjusts the rx deviation?
Thanks.
Andy KC2GOW
Yahoo! Groups Links
* To visit your group on the web, go to:
http://groups.yahoo.com/group/Repeater-Builder/
* To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
* Your use
Does anyone know which pot in the gm300 adjusts the rx deviation?
Thanks.
Andy KC2GOW
The one labeled Volume.
Sorry, couldn't resist.
Seriously, I don't know what you mean. You mean Tx deviation? It's
adjusted in software.
Yahoo! Groups Links
* To visit your group on the web,
There's no such thing as an adjustment for rx
deviation.
However, the transmit deviation is adjusted via RSS -
Radio Service Software - specific for the GM300. This
is the only way you can adjust deviation, output
power, and frequency.
There are two (or three) pots on the RF board. One (or
two)
The GM300 Service Manual 6880902Z32 is still available from Motorola
Parts for $12.75, although a surcharge may apply. This is a fraction of
the cost to make a copy of someone else's manual.
73, Eric Lemmon WB6FLY
Bob M. wrote:
Have you tried ordering them direct from Motorola?
OK thanks for that info. Now the next question is does anybody have a trick for opening up one of those radios? I got the screws out but that cover just dosen't want to come off.
Andy KC2GOW
Yahoo! FareChase - Search multiple travel sites in one click.
://kc8rsr.tripod.com/
AIM / YAHOO = KC8RSR
---Original Message---
From: Andrew G.
Date: 11/09/05 18:14:41
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] GM300 Squelch Adj.
OK thanks for that info. Now the next question is does anybody have a trick
for opening up one
Since the radio is so similar to a MaxTrac, I'll
assume it's enclosed the same way. Remove the two
screws from the control head (T15) and the four
flat-head screws from the sides (T10). Pull the
control head off the covers, then pry the covers off.
They're identical and split in the middle of each
Thanks a lot. That worked like a charm. I needed to lower the squelch as this is the receiver on my repeater. With the current setting, on a mobile station there is no swoosh, just chopping in and out. Again, thanks for all the replies.
Andy KC2GOW
445.125 (4A)
Staten Island,NY
Yahoo!
One trick I've seen:
Take the speaker out of the control head, and drill the
front panel in front of the speaker for a pot and two
mini-toggle switches (one on each side of the pot),
then reinstall the speaker.
The cone shape creates enough clearance for the parts.
Wire one switch as per
Hi Guys,
Wondering if anybody knows how to adjust the squelch level on a
Motorola GM300 mobile (UHF 40ch/40watt)? I have the software but
cannot find a software adjustment, internal? or am I looking in the
wrong spot? Any help is greatly appreciated.
Thanks
Andy KC2GOW
445.125 (4A)
Staten
Additional info. The pot is on the RF board, near the
connector that goes to the logic board. There may be
one or two other pots within an inch of the squelch
pot. Don't touch those. Only adjust the one that has
SQ next to it. If the board has two pots, this is the
one that's further away from the
I have a 40 watt UHF GM300 I would like to tune down to 10 watts? Is
this a safe level to set to on the 40 watt units? I heard that if the
power level is set too low it will cause spurs? What is the lowest
power level I can set the amp to?
Thanx for reading.
Ken
Yahoo! Groups Links
*
the fins.
Hope this helps. Bruce KD4BOH.
- Original Message -
From: Ken [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, July 12, 2005 9:17 AM
Subject: [Repeater-Builder] GM300 power adjustment limit?
I have a 40 watt UHF GM300 I would like to tune down to 10 watts
@yahoogroups.com
Subject: Re: [Repeater-Builder] GM300 power adjustment limit?
I can tell you what I've came up with on mine and it might help. I have
M120's as link transmitters, the boards are basically the same. If I turn my
power down below 8 to 10 watts it starts acting up, spurs and changing power
Yes I am looking for the Service Manual Those darn spell
checkers.
You will not survive without the service
manual.
I need help in finding a PDF of
the Motorola GM300 survive Manual. UHF versionThanks in advanceAlan
B. JonesEmail [EMAIL PROTECTED]Ham
Radio N0QPM
-Builder] GM300 TX Calibration
Where on the site is it ? I couldn't find it.
73, Dick, W1KSZ
-Original Message-
From: Warren Beaule [mailto:[EMAIL PROTECTED]
Sent: Monday, January 10, 2005 2:51 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] GM300
Greetings,
Is there anyone on the list that has an understanding of the soft
calibration procedures for the M120/GM300 radios that would be
willing to help me? I'd prefer off list to as to not take up list
bandwidth.
Thanks,
Scott Madison, WN1B
Yahoo! Groups Links
* To visit your
Where on the site is it ? I couldn't find it.
73, Dick, W1KSZ
-Original Message-
From: Warren Beaule [mailto:[EMAIL PROTECTED]
Sent: Monday, January 10, 2005 2:51 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] GM300 TX Calibration
It is all available free
I have two gm300 radios i have joined together as a
repeater .
can anyone tell mehow to change these to transmitt
and receive ctcss tones .i have already setup the channels with 100
hz.
Thank youIan WellsKerinvale Comaudiomail service
1017,Biloela,4715.www.kerinvalecomaudio.com.auPlease
]
- Original Message -
From:
ian wells
To: Repeater-Builder@yahoogroups.com
Sent: 24 October, 2004 3:26 PM
Subject: [Repeater-Builder] gm300
I have two gm300 radios i have joined together as
a repeater .
can anyone tell mehow to change these to
transmitt
Has anybody built a repeater using two gm300's with the connector
cable like the ones prolific on ebay. If so what did you do for a
controller, id'er etc.
Thanks,
Ryan Holt, KC5LEU, WQAU267
Yahoo! Groups Links
* To visit your group on the web, go to:
The method of connecting the two radios via a cable does works, although
it is not 100% reliable (especially if configured to allow either radio
to tx/rx, such as in cross band). I would recommend that you get
yourself a simple controller such as RLC-1 (link-comm), RC-1000 (Micro
computer
http://www.mikepugh.net/repeater.html Uses two Radius M120's. The
M120's are the 2 channel version of the GM300. Be sure you put a fan on
the transmit radio to dissapate heat, and don't tun it up over 22 or so
watts.. Good luck, holler if you have more questions. Mike
texaswpd103 wrote:
Has
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