Re: [Repeater-Builder] Motorola Maratrac

[n6lrv]

It's been a while since I've done this Lowell but check the SERVICE menu for an 
output power adjustment. I think it's F2 from the RSS main menu. I used to turn 
down my Maratracs alot to increase duty cycle so I know it's there.
Gary
 dy3mnk <[EMAIL PROTECTED]> wrote: 
> Hello,
> 
> I have 2 VHF motorola maratrac units and wants to put them as a
> repeater. I manage to program the unit to HAM Bands. but I can't turn
> down the power output. Its a 100w output on both unit, Iwant tpo turn
> them down up to 30w. How can I trim down the power? Is It done in
> programming? How is it done? Any one out there who can teach me how to
> do it and help will be appreciated very muchThanks 
> 
> Lowell
> 
> 
> 
> 
> 
>  
> Yahoo! Groups Links
> 
> 
> 

Re: [Repeater-Builder] Motorola Maratrac

[Bob M.]

It's in the Service menu. You need the radio attached
to the RIB and computer. Run RSS, press F2, then F2
again for Alignment menu. Then choose Transmit Output
Power.

With a wattmeter and dummy load attached, press F6 to
cause the radio to transmit. Use the UP/DN arrow keys
to fine-tune the power level. If you want to make a
large change, press F6, see what the power is, press
F6 to stop transmitting, use the UP/DN arrow keys to
change the setting by 10-20, press F6 again to check
the power.

There may be several subsequent things RSS will ask
you to adjust; press F8 to save the new power, then
press F10 to exit.

The radio should be stable down to about 50 watts.

Bob M.
==
--- dy3mnk <[EMAIL PROTECTED]> wrote:

> Hello,
> 
> I have 2 VHF motorola maratrac units and wants
> to put them as a
> repeater. I manage to program the unit to HAM Bands.
> but I can't turn
> down the power output. Its a 100w output on both
> unit, Iwant tpo turn
> them down up to 30w. How can I trim down the power?
> Is It done in
> programming? How is it done? Any one out there who
> can teach me how to
> do it and help will be appreciated very
> muchThanks 
> 
> Lowell


  

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RE: [Repeater-Builder] Motorola Maratrac

[Eric Lemmon]

Bob,

Does the MaraTrac have the same problem with power control that the MaxTrac
has- that is, the CPU cannot control power when the transmit frequency is
below a certain point?  Is it necessary to manually control the output power
when an out-of-range frequency is programmed?

73, Eric Lemmon WB6FLY
 

-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Bob M.
Sent: Wednesday, February 20, 2008 5:06 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Motorola Maratrac

It's in the Service menu. You need the radio attached
to the RIB and computer. Run RSS, press F2, then F2
again for Alignment menu. Then choose Transmit Output
Power.

With a wattmeter and dummy load attached, press F6 to
cause the radio to transmit. Use the UP/DN arrow keys
to fine-tune the power level. If you want to make a
large change, press F6, see what the power is, press
F6 to stop transmitting, use the UP/DN arrow keys to
change the setting by 10-20, press F6 again to check
the power.

There may be several subsequent things RSS will ask
you to adjust; press F8 to save the new power, then
press F10 to exit.

The radio should be stable down to about 50 watts.

Bob M.
==
--- dy3mnk <[EMAIL PROTECTED] <mailto:dy3mnk%40yahoo.com> > wrote:

> Hello,
> 
> I have 2 VHF motorola maratrac units and wants
> to put them as a
> repeater. I manage to program the unit to HAM Bands.
> but I can't turn
> down the power output. Its a 100w output on both
> unit, Iwant tpo turn
> them down up to 30w. How can I trim down the power?
> Is It done in
> programming? How is it done? Any one out there who
> can teach me how to
> do it and help will be appreciated very
> muchThanks 
> 
> Lowell

Re: [Repeater-Builder] Motorola Maratrac

[Lowell Zabala]

   I just did what u told on the RSS and the power goes down up to 40w on my 
power meter when i press F6. Now, the problem when its not connected to RSS the 
power reading goes back again to 100w. How can I really control the ouput?
thanks,
Lowell

"Bob M." <[EMAIL PROTECTED]> wrote:   It's in the 
Service menu. You need the radio attached
 

Re: [Repeater-Builder] Motorola Maratrac

[James Delancy]

Are you programming this out of band?  If so, the RSS may not have set 
points available.  You can manipulate the power with the POT on the 
board (I think it is BLUE colored with white dial) just before the PA.  
Then you can fine tune the power in the PA with the all white 
(translucent) pot in the PA.  Please keep your emissions clean and do 
not run the radio below 50 % rated output (55 Watts low band, 50 Watts 
VHF/UHF if I remember correctly).  Also to note, Maratracs and Mitreks 
do not get any more efficient below 50% output, and sometimes make spurs 
on the TX output or get "noisy".

hope this helps you 

James


Lowell Zabala wrote:
>
> I just did what u told on the RSS and the power goes down up to 40w on 
> my power meter when i press F6. Now, the problem when its not 
> connected to RSS the power reading goes back again to 100w. How can I 
> really control the ouput?
> thanks,
>
>

Re: [Repeater-Builder] Motorola Maratrac

[Lowell Zabala]

Hello,

   I just made a succs on turning down the Power output of the maratrac. Thanks 
for all the advice. Now I have another problm on this unit and I still need 
your advice , I will use te unit on echolilnk as a radio , i wired the Ptt 
Audio in and audio out. Now the problem I encounter is that the recieved audio 
is not Decoded even if i Program on the RSS  with TPL both on RX and TX. I got 
the audio out on J22 pin #5. Tanks in advance for your imediate reply..

lowell

James Delancy <[EMAIL PROTECTED]> wrote:   Are you 
programming this out of band?  If so, the RSS may not have set 
 points available.  You can manipulate the power with the POT on the 
 board (I think it is BLUE colored with white dial) just before the PA.  
 Then you can fine tune the power in the PA with the all white 
 (translucent) pot in the PA.  Please keep your emissions clean and do 
 not run the radio below 50 % rated output (55 Watts low band, 50 Watts 
 VHF/UHF if I remember correctly).  Also to note, Maratracs and Mitreks 
 do not get any more efficient below 50% output, and sometimes make spurs 
 on the TX output or get "noisy".
 
 hope this helps you 
 
 James
 
 Lowell Zabala wrote:
 >
 > I just did what u told on the RSS and the power goes down up to 40w on 
 > my power meter when i press F6. Now, the problem when its not 
 > connected to RSS the power reading goes back again to 100w. How can I 
 > really control the ouput?
 > thanks,
 >
 >
 
 
   

   
-
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Re: [Repeater-Builder] Motorola Maratrac...

[Mike Morris WA6ILQ]

At 03:11 PM 06/19/09, you wrote:
>  I have a VHF Moto Maratrac and was thinking about using it for a 
> mobile repeater since it is programable. Can I change the relayed 
> SO-239 to a regular SO-239 for recieve and add another SO-239 in 
> the side for Transmit and it work like that. If this will work I am 
> looking at purching several more VHF and UHF Maratrac for a EMCOMM Trailer.
>
>Thanks,
>Grady Evans

When you get down to the basics a Maratrac is a Maxtrac
with a power amp and a fancy control head.
As such it is a single synthesizer radio and will never duplex.
It is also a limited duty cycle radio - the heat sink is too small
for continuous duty.

I suggest you review the basic Maratrac info at

and then (since the receiver and exciter in a Maratrac is a Maxtrac)
look at the Maxtrac info at


The Maratrac will function as a repeater transmitter but only in a
LOW duty cycle environment (in fact, the manual for the RICK
repeater controller box specifically mentions that - but as the
"M400", which is a Maratrac in Radius drag).

Mike WA6ILQ

Re: [Repeater-Builder] Motorola Maratrac...

[Brian Poellnitz]

The short answer, Grady, is no.  The Maratrac uses the same oscillator 
for transmit and receive.  To make a one-box repeater like with a Micor 
or MastrII, you have to be able to separate the TX and RX so that both 
work at the same time.  Just can't be done with a Maratrac.

That being said, the Maratrac makes a good transmitter, with a few 
modifications. You're right in thinking that the antenna relay should be 
removed.  That's the first mechanical thing  that will break.  If you 
have second mobile (doesn't have to be Maratrac) to use as a receiver, 
you can put a controller between them and it should work fine.  I'll be 
at Field Day sometime Saturday.  If you want, we can talk about it more 
then.

73's de N4BWP

Grady wrote:
> 
> I have a VHF Moto Maratrac and was thinking about using it for a mobile 
> repeater since it is programable. Can I change the relayed SO-239 to a 
> regular SO-239 for recieve and add another SO-239 in the side for 
> Transmit and it work like that. If this will work I am looking at 
> purching several more VHF and UHF Maratrac for a EMCOMM Trailer.
>