[Repeater-Builder] homebrew GPS-locked VoIP-linked simulcast system

[Matthew Kaufman]

I thought I would send a note to the list about what I've built recently 
so that if anyone else is interested in building something similar we 
can trade notes.

I have a ham UHF repeater system in the San Francisco/Monterey Bay area 
( more info at www.wb6ece.org ) with 6 sites all sharing the same 
frequency. For years it has been CTCSS-select of which site you'll go 
through, but I've long wanted to link the sites together, use a voter to 
pick the best receive audio, and simulcast the results back out, but it 
took several clever (at least in my opinion :) ) ideas to get it to 
happen. (Not to mention a number of false starts with three different 
attempts to use 420 MHz analog linking, some self-designed and built PIC 
microcontroller-based audio delay and signalling boards, and other 
interesting and educational experiments that were ultimately dead ends)

At this point we have three of the sites online with the new linking 
system and it works even better than expected. Audio artifacts even in 
heavy-overlap areas are almost nonexistent. A "proper" simulcast system 
would use low-level transmit sites to reduce the overlap, but we've got 
mountaintop sites that have nearly complete overlap of, for instance, 
the San Jose area, and it really works well.

So what were the clever parts?

1. Transmit frequency control. We use Vertex VXR-5000 repeaters. The 
transmitter is modified by removing the internal 12.8 MHz TCXO and 
hooking the PLL chip reference up to a surplus HP Z3801A GPS-disciplined 
10 MHz reference oscillator. Then a PIC microcontroller is installed to 
jam the new divisor settings into the PLL chip over its control lines. 
No need to synthesize up a 12.8 MHz intermediate, as 441.300 MHz (our 
transmit frequency) is easily reached with a 10 MHz reference. Cost is 
the PIC chip, a capacitor, and some cable and connectors.

2. GPS-locked VoIP linking with software voting. The linking is all done 
over IP, by digitizing the audio at each site, computing the noise 
level, sending the audio and the noise level to a central site as VoIP 
packets, and sending the best choice (lowest noise level) packets back 
out to all the transmitters. But for that to work, the transmitter audio 
needs to be in phase, and for inaudible voter switching the receiver 
audio needs to be in phase as well.

So what we do is use a 4-channel 96 kHz sample rate audio card (M-Audio 
Delta 44) at each site, plugged into a Soekris net5501 (500 MHz Geode 
running Linux, 512 MB of RAM, 2 GB of Compact Flash instead of disk, no 
fans). One channel listens to the 1 PPS signal from the Z3801A GPS, one 
channel listens to a looped-back signal from the output of the card, and 
that leaves two full-duplex channels for linking. A software FLL/PLL 
algorithm to align the input audio sample time with the 1 PPS and the 
output audio sample time (as seen via the loopback connection) with the 
1 PPS and we get about 10 microsecond phase accuracy in both directions, 
which is adequate for simulcast. All in software, no specialized DSPs or 
hardware to clock the audio card or anything. And once the audio is 
digital, everything else (tone detection and generation, muting, 
filtering, input and output gain) can be done in software as well. So 
off-the-shelf hardware, plus a cable built to plug everything together, 
turns it into a pure software problem... and we've only just started on 
what's possible in software.

Feel free to comment or ask questions.

Matthew Kaufman, KA6SQG
matt...@matthew.at
http://www.wb6ece.org

ps. Once I catalog everything I have, I plan to sell off all the unused 
420 MHz radios and related gear I've accumulated in the learning process.

pps. We're also in the market for used VXR-5000 repeaters, and 
particularly, Pacific Research RI-210 controllers, for system expansion.

Re: [Repeater-Builder] VHF repeater suggestions...

[Len Revelle]

If he had the bucks to buy anything he wanted the question would be  
moot. Hi.


With current economy he hopes for some local industry help toward the  
replacement so we are looking here, and elsewhere, for "best bang for  
the buck" input.



Len Revelle N9IJ
n...@comcast.net



On Jun 21, 2009, at 1:21 PM, Mike Mullarkey wrote:





If had an emergency manager willing to pay for a repeater I would  
replace it with a Motorola MTR2000 with the front end pre selector  
and necessary connection to connect to an external controller. Hard  
to get much better.




Mike





Mike Mullarkey K7PFJ

6886 Sage Ave

Firestone, Co 80504

303-954-9695 Home

303-954-9693 Home Office & Fax

303-718-8052 Cellular

From: Repeater-Builder@yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com 
] On Behalf Of Len Revelle

Sent: Sunday, June 21, 2009 8:25 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] VHF repeater suggestions...







Our local RACES group has a Kenwood TKR-720 driving a TPL PA that they
were ill-advised to purchase some years ago. It is maintained by the
county radio shop for various reasons and has been a nightmare. Once
again the final in the Kenwood has done a meltdown.

That said, the local EMA manager, also a new ham, wishes to replace it
if he can squeeze the funds out somewhere. My recommendation,
obviously the most expensive, was a Master III and new Arcom
controller simply because the county already maintains three VHF M3's
and a 5-site, 8-channel trunked system using 800 M3's. Parts and
support are good.

I would really appreciate input, both regarding setting up a Master
III, or other viable repeater. We need, minimally, 100% duty-cycle at
approximately 100 watts, good parts and support available, and
reliability. Is there a decent source for M3's with P25 becoming more
desirable, etc..

I don't want a, "mine is better than yours," war so off-reflector
replies are also welcome. TIA...

Len Revelle N9IJ
n...@comcast.net

Re: [Repeater-Builder] VHF repeater suggestions...

[Len Revelle]

We're pretty sour on the Kenwood repeaters though we have a few  
mobiles. Used to do a fair amount of Motorola work until we went  
EDACS. Some 1400 EDACS radios and 100 or so Orion VHF's with paid tech  
support makes us lean toward what we are familiar with.


The 720 has been running at 25W. driving the TPL. Several PA devices  
have been replaced and numerous re-solder jobs have been needed, this  
with additional ventilation holes drilled into the PA case with an  
additional fan to draw air through it. Silver solder has been used for  
some time at Kenwood's suggestion. It resides in an air conditioned  
building with some of our EDACS stuff. Problem is that the repeater is  
a major player, both during drive time and as the major SKYWARN system  
in the area.


Len Revelle N9IJ
n...@comcast.net



On Jun 21, 2009, at 2:47 PM, NORM KNAPP wrote:




Mastr III is a good choice. MTR-2000 is a good choice also, but  
repairs if ever needed can be VERY expensive. Power supplys are out  
of sight.
Are you totally sour on Kenwoods. I would look into the TKR-7400  
series from Kenwood systems. Really good specs for the price.
Back to the 720. What is the power output set too, or how much drive  
does the TPL take for 100watts out?
I have had to re-solder the RF pa transistor in one or two in the  
past. They don't like running wide open all the time. TKR-750 is a  
good repeater also.

73 de N5NPO

- Original Message -
From: Repeater-Builder@yahoogroups.com >
To: Repeater-Builder@yahoogroups.com buil...@yahoogroups.com>

Sent: Sun Jun 21 13:21:51 2009
Subject: RE: [Repeater-Builder] VHF repeater suggestions...



If had an emergency manager willing to pay for a repeater I would  
replace it with a Motorola MTR2000 with the front end pre selector  
and necessary connection to connect to an external controller. Hard  
to get much better.




Mike





Mike Mullarkey K7PFJ

6886 Sage Ave

Firestone, Co 80504

303-954-9695 Home

303-954-9693 Home Office & Fax

303-718-8052 Cellular

From: Repeater-Builder@yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com 
] On Behalf Of Len Revelle

Sent: Sunday, June 21, 2009 8:25 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] VHF repeater suggestions...








Our local RACES group has a Kenwood TKR-720 driving a TPL PA that they
were ill-advised to purchase some years ago. It is maintained by the
county radio shop for various reasons and has been a nightmare. Once
again the final in the Kenwood has done a meltdown.

That said, the local EMA manager, also a new ham, wishes to replace it
if he can squeeze the funds out somewhere. My recommendation,
obviously the most expensive, was a Master III and new Arcom
controller simply because the county already maintains three VHF M3's
and a 5-site, 8-channel trunked system using 800 M3's. Parts and
support are good.

I would really appreciate input, both regarding setting up a Master
III, or other viable repeater. We need, minimally, 100% duty-cycle at
approximately 100 watts, good parts and support available, and
reliability. Is there a decent source for M3's with P25 becoming more
desirable, etc..

I don't want a, "mine is better than yours," war so off-reflector
replies are also welcome. TIA...

Len Revelle N9IJ
n...@comcast.net 

[Repeater-Builder] Re: WTB Motorola Desktrac UHF or VHF Ham Band 40w

[BJ]

We have the following available:

D43SUM7000BT  VHF repeater  
$350.00

D44SUM7000BT  UHF repeater  
$350.00

Celwave notch duplexer UHF (similar to 633 series / square rather than flat)
 $100.00 with radio only

Celwave 4 cavity pass/notch duplexer UHF
 $150.00 (this is a consignment unit we have)

We also have a NOS/DEMO Telewave ANT150F2 and a NOS/DEMO Celwave BA1010 that 
are both rated down to 146.

They are consignment and the asking price is $200 each.
 
All above items are + shipping from 89815.

Thanks,

BJ
microwavetechnology
@yahoo.com


--- In Repeater-Builder@yahoogroups.com, David Hubbell  wrote:
>
> I am looking for Motorola Desktracs on the ham bands. I need both the 
> UHF and VHF units at the 40w output level.
> N2KTO
> Dave Hubbell
> 862.266.2339
>

RE: [Repeater-Builder] Transmitter Fingerprinting

[Mike Mullarkey]

Randy,

 

Call them and he will produce one or two for you. They are located in my
home town and have used them, they work great. 

 

Good Luck,

 

 

 

 

Mike Mullarkey K7PFJ

6886 Sage Ave

Firestone, Co 80504

303-954-9695 Home

303-954-9693 Home Office & Fax

303-718-8052 Cellular

From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of ran...@farmtel.net
Sent: Sunday, June 21, 2009 9:15 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Transmitter Fingerprinting

 






Motron used to have the TX-ID but apparently it is no longer produced.

Does anyone know of hardware or software for reliably fingerprinting
transmitters?

Randy
WB0VHB

Re: [Repeater-Builder] Mobile Duplexer for 30W repeater ok?

[George Henry]

> - Original Message -
> From: Repeater-Builder@yahoogroups.com 
> To: Repeater-Builder@yahoogroups.com 
> Sent: Sun Jun 21 15:46:48 2009
> Subject: [Repeater-Builder] Mobile Duplexer for 30W repeater ok?
>
>
>
> Just a double-check question. I'm thinking of buying a UHF mobile duplexer 
> to use with my repeater at home. Since I'll only be running 30 watts, any 
> opinions if this is a bad idea?
>
> Most of the older style "cans" are getting higher auction prices, but some 
> mobile packs are pretty reasonable.
>
> Thanks,
> Tony KT9AC


I picked up a Decibel DB4072 on E-Bay for only $100, and the seller even 
tuned it to my frequencies for me...  a much better option, if you have the 
flexibility to wait for a good deal.  (I couldn't get a mobile duplexer to 
move more than about 4 MHz without major degradation...)

George, KA3HSW / WQGJ413 

[Repeater-Builder] Transmitter Fingerprinting

[randy2]

Motron used to have the TX-ID but apparently it is no longer produced.

Does anyone know of hardware or software for reliably fingerprinting 
transmitters?


Randy
WB0VHB

Re: [Repeater-Builder] Mobile Duplexer for 30W repeater ok?

[NORM KNAPP]

I know of a TKR-820 on 444.225/449.225 with one of those cellwave mobile 
duplexers and it works just great. The antenna is a 1992 vintage db-420 at 
around 290' with around 310' of LDF5-50A (7/8) andrew heliax feeding it. They 
are thinking of replacing the TKR-820 with a 100w Mastr II , but then they 
would have to come up with better duplexers to handle the power. What to do?
73 de N5NPO

- Original Message -
From: Repeater-Builder@yahoogroups.com 
To: Repeater-Builder@yahoogroups.com 
Sent: Sun Jun 21 15:46:48 2009
Subject: [Repeater-Builder] Mobile Duplexer for 30W repeater ok?



Just a double-check question. I'm thinking of buying a UHF mobile duplexer to 
use with my repeater at home. Since I'll only be running 30 watts, any opinions 
if this is a bad idea?

Most of the older style "cans" are getting higher auction prices, but some 
mobile packs are pretty reasonable. 

Thanks,
Tony KT9AC

RE: [Repeater-Builder] Mobile Duplexer for 30W repeater ok?

[Peter Summerhawk]

Found a mobile repeater duplexer for our VHF system for around $119.00 on
eBay with no problem. So you should be ok with a UHF one.

Peter

 

-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Jim WB5OXQ inb Waco,
TX
Sent: Sunday, June 21, 2009 3:17 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Mobile Duplexer for 30W repeater ok?

 






I have used the mobile duplexers on uhf systems under 40 watts with
satisfactory results.  Small and usually can be had new for under 300.00

- Original Message - 

From: Larry   Wagoner 

To: Repeater-Builder@ 
yahoogroups.com 

Sent: Sunday, June 21, 2009 3:49 PM

Subject: Re: [Repeater-Builder] Mobile Duplexer for 30W repeater ok?

 

At 03:46 PM 6/21/2009, you wrote:
>Just a double-check question. I'm thinking of buying a UHF mobile 
>duplexer to use with my repeater at home. Since I'll only be running 
>30 watts, any opinions if this is a bad idea?

Ladies and gentlemen - we are at DEFCON 5...

Larry Wagoner - N5WLW
VP - PRCARC
PIC - MS SECT ARRL 

RE: [Repeater-Builder] Re: Mobile Duplexer for 30W repeater ok?

[Eric Lemmon]

Tony,

I recently tested a Celwave model 633-6A-1N duplexer that was manufactured
for 70 cm, and both sides had insertion loss below 0.95 dB with notch depths
above 80 dB.

73, Eric Lemmon WB6FLY
 

-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of kt...@ameritech.net
Sent: Sunday, June 21, 2009 3:07 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re: Mobile Duplexer for 30W repeater ok?



Thanks to everyone so far - it does make sense from the power limits, but if
it will work at 443/448 ok or not (out of commercial bandwidth specs).

What level of isolation (DB's) should I be looking for in a used duplexer
then?

Tony

--- In Repeater-Builder@yahoogroups.com
 , "kt...@..."  wrote:
>
> Just a double-check question. I'm thinking of buying a UHF mobile duplexer
to use with my repeater at home. Since I'll only be running 30 watts, any
opinions if this is a bad idea?
> 
> Most of the older style "cans" are getting higher auction prices, but some
mobile packs are pretty reasonable. 
> 
> Thanks,
> Tony KT9AC
>

RE: [Repeater-Builder] Re: Mobile Duplexer for 30W repeater ok?

[Eric Lemmon]

 

-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of kt...@ameritech.net
Sent: Sunday, June 21, 2009 3:07 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re: Mobile Duplexer for 30W repeater ok?



Thanks to everyone so far - it does make sense from the power limits, but if
it will work at 443/448 ok or not (out of commercial bandwidth specs).

What level of isolation (DB's) should I be looking for in a used duplexer
then?

Tony

--- In Repeater-Builder@yahoogroups.com
 , "kt...@..."  wrote:
>
> Just a double-check question. I'm thinking of buying a UHF mobile duplexer
to use with my repeater at home. Since I'll only be running 30 watts, any
opinions if this is a bad idea?
> 
> Most of the older style "cans" are getting higher auction prices, but some
mobile packs are pretty reasonable. 
> 
> Thanks,
> Tony KT9AC
>

[Repeater-Builder] Re: Mobile Duplexer for 30W repeater ok?

[kt...@ameritech.net]

Thanks to everyone so far - it does make sense from the power limits, but if it 
will work at 443/448 ok or not (out of commercial bandwidth specs).

What level of isolation (DB's) should I be looking for in a used duplexer then?

Tony


--- In Repeater-Builder@yahoogroups.com, "kt...@..."  wrote:
>
> Just a double-check question. I'm thinking of buying a UHF mobile duplexer to 
> use with my repeater at home. Since I'll only be running 30 watts, any 
> opinions if this is a bad idea?
> 
> Most of the older style "cans" are getting higher auction prices, but some 
> mobile packs are pretty reasonable. 
> 
> Thanks,
> Tony KT9AC
>

Re: [Repeater-Builder] Mobile Duplexer for 30W repeater ok?

[Chuck Kelsey]

I've used a TX/RX mobile duplexer with very good results. Mine was tuned up 
at TX/RX, although it was originally in the commercial band. The TX/RX units 
are better (in my opinion) than the typical "flat packs" made by others. 
Although I have used the flat packs in the ham band with good luck. Again, 
I'm talking about UHF.

Chuck
WB2EDV


- Original Message - 
From: "Eric Lemmon" 
To: 
Sent: Sunday, June 21, 2009 5:43 PM
Subject: RE: [Repeater-Builder] Mobile Duplexer for 30W repeater ok?


> Tony,
>
> Most UHF mobile notch-only flatpack duplexers will work fine below 50 
> watts
> at a 5 MHz split- but their performance rapidly deteriorates when operated
> outside of their stated band limits.  For example, a commercial-band 
> mobile
> duplexer that was manufactured to operate in the 450-470 MHz band will
> likely perform poorly in the 440-450 MHz Amateur band.  Although such a
> duplexer may SEEM to be working in the Ham 70 cm band, it may have 
> excessive
> insertion loss that the owner may not realize.  That's because the 
> coupling
> loops are set at the factory and not readily adjustable by the owner.
>
> I once tried to use a commercial-band mobile duplexer on 70 cm in a 
> portable
> repeater, and was disappointed in its performance- especially receive
> sensitivity.  I then ordered a new Celwave duplexer of the same model, but
> factory-tuned for my Amateur pair.  What a difference!  Once the new
> duplexer was installed, the range of the portable repeater was 
> significantly
> improved, with no other changes.
>
> 73, Eric Lemmon WB6FLY
>
>
> -Original Message-
> From: Repeater-Builder@yahoogroups.com
> [mailto:repeater-buil...@yahoogroups.com] On Behalf Of kt...@ameritech.net
> Sent: Sunday, June 21, 2009 1:47 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: [Repeater-Builder] Mobile Duplexer for 30W repeater ok?
>
>
>
> Just a double-check question. I'm thinking of buying a UHF mobile duplexer
> to use with my repeater at home. Since I'll only be running 30 watts, any
> opinions if this is a bad idea?
>
> Most of the older style "cans" are getting higher auction prices, but some
> mobile packs are pretty reasonable.
>
> Thanks,
> Tony KT9AC
>
>

RE: [Repeater-Builder] Mobile Duplexer for 30W repeater ok?

[Eric Lemmon]

Tony,

Most UHF mobile notch-only flatpack duplexers will work fine below 50 watts
at a 5 MHz split- but their performance rapidly deteriorates when operated
outside of their stated band limits.  For example, a commercial-band mobile
duplexer that was manufactured to operate in the 450-470 MHz band will
likely perform poorly in the 440-450 MHz Amateur band.  Although such a
duplexer may SEEM to be working in the Ham 70 cm band, it may have excessive
insertion loss that the owner may not realize.  That's because the coupling
loops are set at the factory and not readily adjustable by the owner.

I once tried to use a commercial-band mobile duplexer on 70 cm in a portable
repeater, and was disappointed in its performance- especially receive
sensitivity.  I then ordered a new Celwave duplexer of the same model, but
factory-tuned for my Amateur pair.  What a difference!  Once the new
duplexer was installed, the range of the portable repeater was significantly
improved, with no other changes.

73, Eric Lemmon WB6FLY


-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of kt...@ameritech.net
Sent: Sunday, June 21, 2009 1:47 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Mobile Duplexer for 30W repeater ok?



Just a double-check question. I'm thinking of buying a UHF mobile duplexer
to use with my repeater at home. Since I'll only be running 30 watts, any
opinions if this is a bad idea?

Most of the older style "cans" are getting higher auction prices, but some
mobile packs are pretty reasonable. 

Thanks,
Tony KT9AC

Re: [Repeater-Builder] VHF repeater suggestions...

[Maire-Radios]

or is you want a high end repeater get a Kenwood TKR-740   max output 5 watts 
but like the Mircor repeaters  great front end and has the DB25 for hook up to 
a 210 controller.


  - Original Message - 
  From: Maire-Radios 
  To: Repeater-Builder@yahoogroups.com 
  Sent: Sunday, June 21, 2009 5:34 PM
  Subject: Re: [Repeater-Builder] VHF repeater suggestions...






  keep the TPL  get a Kenwood TKR-750 or 751 and a 210 controller.  mine has 
been on the air for 2 years and not a bit of trouble.

  Using a TKR-751 on low power 4 watts out factory tuned at Kenwood systems in 
GA.

  John

- Original Message - 
From: Peter Dakota Summerhawk 
To: Repeater-Builder@yahoogroups.com 
Sent: Sunday, June 21, 2009 2:39 PM
Subject: RE: [Repeater-Builder] VHF repeater suggestions...




Our local RACES group has a Kenwood TKR-720 driving a TPL PA that they 
were ill-advised to purchase some years ago. It is maintained by the 
county radio shop for various reasons and has been a nightmare. Once 
again the final in the Kenwood has done a meltdown.

That said, the local EMA manager, also a new ham, wishes to replace it 
if he can squeeze the funds out somewhere. My recommendation, 
obviously the most expensive, was a Master III and new Arcom 
controller simply because the county already maintains three VHF M3's 
and a 5-site, 8-channel trunked system using 800 M3's. Parts and 
support are good.

I would really appreciate input, both regarding setting up a Master 
III, or other viable repeater. We need, minimally, 100% duty-cycle at 
approximately 100 watts, good parts and support available, and 
reliability. Is there a decent source for M3's with P25 becoming more 
desirable, etc..

I don't want a, "mine is better than yours," war so off-reflector 
replies are also welcome. TIA...

Len Revelle N9IJ
n...@comcast.net



  

Re: [Repeater-Builder] VHF repeater suggestions...

[Maire-Radios]

keep the TPL  get a Kenwood TKR-750 or 751 and a 210 controller.  mine has been 
on the air for 2 years and not a bit of trouble.

Using a TKR-751 on low power 4 watts out factory tuned at Kenwood systems in GA.

John

  - Original Message - 
  From: Peter Dakota Summerhawk 
  To: Repeater-Builder@yahoogroups.com 
  Sent: Sunday, June 21, 2009 2:39 PM
  Subject: RE: [Repeater-Builder] VHF repeater suggestions...







  Our local RACES group has a Kenwood TKR-720 driving a TPL PA that they 
  were ill-advised to purchase some years ago. It is maintained by the 
  county radio shop for various reasons and has been a nightmare. Once 
  again the final in the Kenwood has done a meltdown.

  That said, the local EMA manager, also a new ham, wishes to replace it 
  if he can squeeze the funds out somewhere. My recommendation, 
  obviously the most expensive, was a Master III and new Arcom 
  controller simply because the county already maintains three VHF M3's 
  and a 5-site, 8-channel trunked system using 800 M3's. Parts and 
  support are good.

  I would really appreciate input, both regarding setting up a Master 
  III, or other viable repeater. We need, minimally, 100% duty-cycle at 
  approximately 100 watts, good parts and support available, and 
  reliability. Is there a decent source for M3's with P25 becoming more 
  desirable, etc..

  I don't want a, "mine is better than yours," war so off-reflector 
  replies are also welcome. TIA...

  Len Revelle N9IJ
  n...@comcast.net


  

Re: [Repeater-Builder] Mobile Duplexer for 30W repeater ok?

[Jim WB5OXQ inb Waco, TX]

I have used the mobile duplexers on uhf systems under 40 watts with 
satisfactory results.  Small and usually can be had new for under 300.00
  - Original Message - 
  From: Larry Wagoner 
  To: Repeater-Builder@yahoogroups.com 
  Sent: Sunday, June 21, 2009 3:49 PM
  Subject: Re: [Repeater-Builder] Mobile Duplexer for 30W repeater ok?





  At 03:46 PM 6/21/2009, you wrote:
  >Just a double-check question. I'm thinking of buying a UHF mobile 
  >duplexer to use with my repeater at home. Since I'll only be running 
  >30 watts, any opinions if this is a bad idea?

  Ladies and gentlemen - we are at DEFCON 5...

  Larry Wagoner - N5WLW
  VP - PRCARC
  PIC - MS SECT ARRL 



  

Re: [Repeater-Builder] Mobile Duplexer for 30W repeater ok?

[Larry Wagoner]

At 03:46 PM 6/21/2009, you wrote:
>Just a double-check question. I'm thinking of buying a UHF mobile 
>duplexer to use with my repeater at home. Since I'll only be running 
>30 watts, any opinions if this is a bad idea?

Ladies and gentlemen - we are at DEFCON 5...



Larry Wagoner - N5WLW
VP - PRCARC
PIC - MS SECT ARRL 

[Repeater-Builder] Mobile Duplexer for 30W repeater ok?

[kt...@ameritech.net]

Just a double-check question. I'm thinking of buying a UHF mobile duplexer to 
use with my repeater at home. Since I'll only be running 30 watts, any opinions 
if this is a bad idea?

Most of the older style "cans" are getting higher auction prices, but some 
mobile packs are pretty reasonable. 

Thanks,
Tony KT9AC

Re: [Repeater-Builder] VHF repeater suggestions...

[NORM KNAPP]

Mastr III is a good choice. MTR-2000 is a good choice also, but repairs if ever 
needed can be VERY expensive. Power supplys are out of sight.
Are you totally sour on Kenwoods. I would look into the TKR-7400 series from 
Kenwood systems. Really good specs for the price.
Back to the 720. What is the power output set too, or how much drive does the 
TPL take for 100watts out?
I have had to re-solder the RF pa transistor in one or two in the past. They 
don't like running wide open all the time. TKR-750 is a good repeater also.
73 de N5NPO

- Original Message -
From: Repeater-Builder@yahoogroups.com 
To: Repeater-Builder@yahoogroups.com 
Sent: Sun Jun 21 13:21:51 2009
Subject: RE: [Repeater-Builder] VHF repeater suggestions...



If had an emergency manager willing to pay for a repeater I would replace it 
with a Motorola MTR2000 with the front end pre selector and necessary 
connection to connect to an external controller. Hard to get much better.

 

Mike

 

 

Mike Mullarkey K7PFJ

6886 Sage Ave

Firestone, Co 80504

303-954-9695 Home

303-954-9693 Home Office & Fax

303-718-8052 Cellular

From: Repeater-Builder@yahoogroups.com 
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Len Revelle
Sent: Sunday, June 21, 2009 8:25 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] VHF repeater suggestions...

 






Our local RACES group has a Kenwood TKR-720 driving a TPL PA that they 
were ill-advised to purchase some years ago. It is maintained by the 
county radio shop for various reasons and has been a nightmare. Once 
again the final in the Kenwood has done a meltdown.

That said, the local EMA manager, also a new ham, wishes to replace it 
if he can squeeze the funds out somewhere. My recommendation, 
obviously the most expensive, was a Master III and new Arcom 
controller simply because the county already maintains three VHF M3's 
and a 5-site, 8-channel trunked system using 800 M3's. Parts and 
support are good.

I would really appreciate input, both regarding setting up a Master 
III, or other viable repeater. We need, minimally, 100% duty-cycle at 
approximately 100 watts, good parts and support available, and 
reliability. Is there a decent source for M3's with P25 becoming more 
desirable, etc..

I don't want a, "mine is better than yours," war so off-reflector 
replies are also welcome. TIA...

Len Revelle N9IJ
n...@comcast.net  

RE: [Repeater-Builder] VHF repeater suggestions...

[Eric Lemmon]

Len,

You can't go wrong with a Motorola MTR2000 repeater.  I have three of them
in Amateur service, and four of them in commercial service.  The MTR2000 is
available in 40 watt and 100 watt versions, both rated for continuous duty.
The MTR2000 has a built-in controller, so no outboard controller is
necessary but can be added.  Be aware that the 100 watt VHF station is made
in two splits (132-154 MHz and 150-174 MHz), and you must order the lower
(Range 1) split for 2m service.  More information is here:


73, Eric Lemmon WB6FLY

 

-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Len Revelle
Sent: Sunday, June 21, 2009 7:25 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] VHF repeater suggestions...



Our local RACES group has a Kenwood TKR-720 driving a TPL PA that they 
were ill-advised to purchase some years ago. It is maintained by the 
county radio shop for various reasons and has been a nightmare. Once 
again the final in the Kenwood has done a meltdown.

That said, the local EMA manager, also a new ham, wishes to replace it 
if he can squeeze the funds out somewhere. My recommendation, 
obviously the most expensive, was a Master III and new Arcom 
controller simply because the county already maintains three VHF M3's 
and a 5-site, 8-channel trunked system using 800 M3's. Parts and 
support are good.

I would really appreciate input, both regarding setting up a Master 
III, or other viable repeater. We need, minimally, 100% duty-cycle at 
approximately 100 watts, good parts and support available, and 
reliability. Is there a decent source for M3's with P25 becoming more 
desirable, etc..

I don't want a, "mine is better than yours," war so off-reflector 
replies are also welcome. TIA...

Len Revelle N9IJ
n...@comcast.net  

Re: [Repeater-Builder] VHF repeater suggestions...

[Jim WB5OXQ inb Waco, TX]

Midland has a new 110 watt repeater that can go key down forever without 
overheating.  The whole rackmount cabinet is cast aluminum fins.  I have had 
one in my hands very heavy piece not typical sheetmetal cabinet.  I have not 
sold one yet though.  Not cheap but less than a M3 or Motorola 110 watt 
continuous duty.  Has a 5 year warranty too!
  - Original Message - 
  From: Peter Dakota Summerhawk 
  To: Repeater-Builder@yahoogroups.com 
  Sent: Sunday, June 21, 2009 1:39 PM
  Subject: RE: [Repeater-Builder] VHF repeater suggestions...







  Our local RACES group has a Kenwood TKR-720 driving a TPL PA that they 
  were ill-advised to purchase some years ago. It is maintained by the 
  county radio shop for various reasons and has been a nightmare. Once 
  again the final in the Kenwood has done a meltdown.

  That said, the local EMA manager, also a new ham, wishes to replace it 
  if he can squeeze the funds out somewhere. My recommendation, 
  obviously the most expensive, was a Master III and new Arcom 
  controller simply because the county already maintains three VHF M3's 
  and a 5-site, 8-channel trunked system using 800 M3's. Parts and 
  support are good.

  I would really appreciate input, both regarding setting up a Master 
  III, or other viable repeater. We need, minimally, 100% duty-cycle at 
  approximately 100 watts, good parts and support available, and 
  reliability. Is there a decent source for M3's with P25 becoming more 
  desirable, etc..

  I don't want a, "mine is better than yours," war so off-reflector 
  replies are also welcome. TIA...

  Len Revelle N9IJ
  n...@comcast.net


  

RE: [Repeater-Builder] VHF repeater suggestions...

[Peter Dakota Summerhawk]

Len,

Shot you an email off list.

Peter

 

-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Len Revelle
Sent: Sunday, June 21, 2009 8:25 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] VHF repeater suggestions...

 






Our local RACES group has a Kenwood TKR-720 driving a TPL PA that they 
were ill-advised to purchase some years ago. It is maintained by the 
county radio shop for various reasons and has been a nightmare. Once 
again the final in the Kenwood has done a meltdown.

That said, the local EMA manager, also a new ham, wishes to replace it 
if he can squeeze the funds out somewhere. My recommendation, 
obviously the most expensive, was a Master III and new Arcom 
controller simply because the county already maintains three VHF M3's 
and a 5-site, 8-channel trunked system using 800 M3's. Parts and 
support are good.

I would really appreciate input, both regarding setting up a Master 
III, or other viable repeater. We need, minimally, 100% duty-cycle at 
approximately 100 watts, good parts and support available, and 
reliability. Is there a decent source for M3's with P25 becoming more 
desirable, etc..

I don't want a, "mine is better than yours," war so off-reflector 
replies are also welcome. TIA...

Len Revelle N9IJ
n...@comcast.  net

RE: [Repeater-Builder] VHF repeater suggestions...

[Mike Mullarkey]

If had an emergency manager willing to pay for a repeater I would replace it
with a Motorola MTR2000 with the front end pre selector and necessary
connection to connect to an external controller. Hard to get much better.

 

Mike

 

 

Mike Mullarkey K7PFJ

6886 Sage Ave

Firestone, Co 80504

303-954-9695 Home

303-954-9693 Home Office & Fax

303-718-8052 Cellular

From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Len Revelle
Sent: Sunday, June 21, 2009 8:25 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] VHF repeater suggestions...

 






Our local RACES group has a Kenwood TKR-720 driving a TPL PA that they 
were ill-advised to purchase some years ago. It is maintained by the 
county radio shop for various reasons and has been a nightmare. Once 
again the final in the Kenwood has done a meltdown.

That said, the local EMA manager, also a new ham, wishes to replace it 
if he can squeeze the funds out somewhere. My recommendation, 
obviously the most expensive, was a Master III and new Arcom 
controller simply because the county already maintains three VHF M3's 
and a 5-site, 8-channel trunked system using 800 M3's. Parts and 
support are good.

I would really appreciate input, both regarding setting up a Master 
III, or other viable repeater. We need, minimally, 100% duty-cycle at 
approximately 100 watts, good parts and support available, and 
reliability. Is there a decent source for M3's with P25 becoming more 
desirable, etc..

I don't want a, "mine is better than yours," war so off-reflector 
replies are also welcome. TIA...

Len Revelle N9IJ
n...@comcast.net  

[Repeater-Builder] VHF repeater suggestions...

[Len Revelle]

Our local RACES group has a Kenwood TKR-720 driving a TPL PA that they  
were ill-advised to purchase some years ago. It is maintained by the  
county radio shop for various reasons and has been a nightmare. Once  
again the final in the Kenwood has done a meltdown.

That said, the local EMA manager, also a new ham, wishes to replace it  
if he can squeeze the funds out somewhere. My recommendation,  
obviously the most expensive, was a Master III and new Arcom  
controller simply because the county already maintains three VHF M3's  
and a 5-site, 8-channel trunked system using 800 M3's. Parts and  
support are good.

I would really appreciate input, both regarding setting up a Master  
III, or other viable repeater. We need, minimally, 100% duty-cycle at  
approximately 100 watts, good parts and support available, and  
reliability. Is there a decent source for M3's with P25 becoming more  
desirable, etc..

I don't want a, "mine is better than yours," war so off-reflector  
replies are also welcome. TIA...

Len Revelle N9IJ
n...@comcast.net

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

[travis8303]

One of my UHF repeaters functioned with a Maratrac transmitter for over a year, 
very light duty cycle and the wattage was turned down. Well, it eventually went 
out so I installed a second, the output was set as it came in at about 100 
watts, didn't last 3 days. The UHF Maratracs were cooled by three large fans, 
doesn't matter, they are designed for a light duty cycle.

Unless you are sure about the duty cycle and lower wattage output, using a 
Maratrac wouldn't be recommended.

I tried both the RICK and a standard controller, didn't like the rick unit for 
the interface or the audio. My preference is a small controller like the RC1000 
by MCC. The Maratrac is easy to interface as a repeater transmitter if you have 
the A7 control head.

Travis
AA9NV

--- In Repeater-Builder@yahoogroups.com, Mike Morris WA6ILQ  wrote:
>
> 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
>