Re: [Repeater-Builder] Micor Repeater - ID?

[MCH]

Actually, the 'RC' indicates a Micor Unified Chassis
and the 'B' indicates 120V AC Power source.

And the '1' listed as N/A means 25 kHz channel spacing for that band.

Joe M.

Eric Lemmon wrote:
> 
> Mike,
> 
> The C64RCB-3105AT (I'm pretty sure the "Y" is actually a "T") station is
> described as:
> 
> C = Compa Station
> 64 = 75 watt output in the UHF band
> RCB = Continuous Duty PA
> 3 = PL Tone-Coded Squelch
> 1 = N/A
> 0 = 1 TX and 1 RX
> 5 = DC Remote Control
> AT = Repeater Station
> 
> You can get more information by looking at the numbers stamped on the
> various boards.
> 
> 73, Eric Lemmon WB6FLY
> 
> -Original Message-
> From: Repeater-Builder@yahoogroups.com
> [mailto:[EMAIL PROTECTED] On Behalf Of Mike Benonis
> Sent: Saturday, February 02, 2008 1:38 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: [Repeater-Builder] Micor Repeater - ID?
> 
> Good day,
> I just picked up what I believe is a Micor repeater at a Hamfest
> today for free. I'm told the repeater works, but I can't verify
> that. Here's what I know about it:
> 
> Form Factor: Rack-Mounted
> Model Number: C64RCB-3105AY
> FCC Xmit Info: CC4224C
> FCC Rcvr Info: RC0080
> Frequency: 464.050 MHz (I assume this is TX, but it doesn't say
> specifically on the label)
> 
> Cards installed:
> 2x Four User Control Modules
> 1x Master Decoder
> 1x Squelch Gate
> 1x Station COntrol Module
> 1x Time Out Timer
> 
> It has a Motorola power supply in the rack at the bottom. I didn't
> see any cans mounted in the rack, but I only found one N connector on
> the back (ublabeled, of course, but it looks like it comes out of a
> large silver box at the top of the rack with a heatsink on it. I can
> provide photos of the unit if needed.
> 
> I'd like to convert this down to the 440 MHz amateur band if possible,
> for less than say, $1000 in new parts/repairs. Can anyone tell me,
> based on the information given, if this seems like a reasonable thing
> to do? If this is a boat anchor, I'm perfectly happy to get rid of it
> - but I figured, for free, what do I lose?
> 
> Best regards,
> 
> Mike Benonis
> Electrical Engineering '09
> Department of Drama Sound Engineer
> The University of Virginia
> [EMAIL PROTECTED] 
> KI4RIX
> 
> 
> Yahoo! Groups Links
> 
> 
> 

RE: [Repeater-Builder] Micor Repeater - ID?

[Eric Lemmon]

Mike,

The C64RCB-3105AT (I'm pretty sure the "Y" is actually a "T") station is
described as:

C = Compa Station
64 = 75 watt output in the UHF band
RCB = Continuous Duty PA
3 = PL Tone-Coded Squelch
1 = N/A
0 = 1 TX and 1 RX
5 = DC Remote Control
AT = Repeater Station

You can get more information by looking at the numbers stamped on the
various boards.

73, Eric Lemmon WB6FLY


-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Mike Benonis
Sent: Saturday, February 02, 2008 1:38 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Micor Repeater - ID?

Good day,
I just picked up what I believe is a Micor repeater at a Hamfest 
today for free. I'm told the repeater works, but I can't verify 
that. Here's what I know about it:

Form Factor: Rack-Mounted
Model Number: C64RCB-3105AY
FCC Xmit Info: CC4224C
FCC Rcvr Info: RC0080
Frequency: 464.050 MHz (I assume this is TX, but it doesn't say 
specifically on the label)

Cards installed:
2x Four User Control Modules
1x Master Decoder
1x Squelch Gate
1x Station COntrol Module
1x Time Out Timer

It has a Motorola power supply in the rack at the bottom. I didn't 
see any cans mounted in the rack, but I only found one N connector on 
the back (ublabeled, of course, but it looks like it comes out of a 
large silver box at the top of the rack with a heatsink on it. I can 
provide photos of the unit if needed.

I'd like to convert this down to the 440 MHz amateur band if possible, 
for less than say, $1000 in new parts/repairs. Can anyone tell me, 
based on the information given, if this seems like a reasonable thing 
to do? If this is a boat anchor, I'm perfectly happy to get rid of it 
- but I figured, for free, what do I lose?

Best regards,

Mike Benonis
Electrical Engineering '09
Department of Drama Sound Engineer
The University of Virginia
[EMAIL PROTECTED]  
KI4RIX

Re: [Repeater-Builder] new repeater

[Cort Buffington]

Collin,

I used to build Mitreks up into repeaters as far back as 1990. They  
work quite well. Just check out the files on the Repeater-Builder  
site. All of the information is there. The only thing I ever skimped  
on doing that hurt later was to not gut the T/R relay and wire the TX  
path right through it. I used them down on the 145 repeater sub-band  
and never did any tuned circuit changes to the radio, but I did have  
to sometimes pick the radio that would go that far. Keep the TX power  
turned back, use an external PA if you really need a lot of power.

I used to have a little circuit board I printed that had volume &  
squelch controls as well as a COR buffer. It plugged into the PL board  
header (got some signals there) - it was quite handy. Easy enough to  
custom make one of those.

73 DE N0MJS

On Feb 1, 2008, at 3:58 PM, [EMAIL PROTECTED] wrote:

> Hi,
> I am building a 2 meter repeater. Am leaning towards Motorola surplus.
> Mitrek probably. Any suggestions or short cuts around bad pitfalls I
> may be coming to? Sure would like to use good equipment and save  
> some $
> too. I have researched Mitrek repeaters some but would like more  
> input.
> I am planning nothing fancy. Only the basics.
> Thanks, Collin
> __
> More new features than ever. Check out the new AOL Mail ! -
> http://webmail.aol.com
> 





 
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Re: [Repeater-Builder] NASA audio on IRLP?

[Ray Brown]

- Original Message - 
From: "tony dinkel" <[EMAIL PROTECTED]>


> Does anyone know of an IRLP reflector or node that has non-shuttle mission 
> audio of the ISS comms on it?

  Working on it... the moderator of the list at [EMAIL PROTECTED]
streams pre and post-launch (and landing) audio via http://kscops.com - he also
mixes in Recovery Ships SSB when possible with conditions at that time.

  I've asked him if he carries all the mundane traffic, haven't heard back from 
him yet.


Ray  KBØSTN

[Repeater-Builder] Since we've been on 220 repeater discussion - here are some pics of My Repeater.

[corvette94541]

http://xs.to/xs.php?h=xs224&d=08050&f=220repeater1a286.png

http://xs.to/xs.php?h=xs224&d=08050&f=220repeater2a375.png

Re: [Repeater-Builder] Midland Land Mobile Model 70-9020

[Dennis Bridgeman]

Trevor,
The radio is a 70-9020 and has the same pinout as the Midland XTR 8-channel 
radios.  I have the pinouts on my website.  Click on the "Midland Wiring 
Diagrams" tab.  Under the "SynTech I and XTR models" section, click on the XTR 
(8-channel models) wiring diagram.  It will have what you need.

Contact me with any questions.
 
Dennis Bridgeman KCØFWN
Bridgeman Communications
202 Seventh Street
Carmi, IL 62821
http://bridgemancommunications.com

  - Original Message - 
  From: Trevor 
  To: Repeater-Builder@yahoogroups.com 
  Sent: Saturday, February 02, 2008 4:20 PM
  Subject: [Repeater-Builder] Midland Land Mobile Model 70-9020 


  Hello group:I need pin out info on this radio of the rear power
  connector so I can play with it !! any one help me out its 15 watt
  800 mhz trunking 200 channel radio,, thin black ,,with plastic bottom
  cover...

  any info or file locations on the net would be nice as well.. I hope
  some one can help me..Ve3tlt Trevor.



   

RE: [Repeater-Builder] new repeater

[R. K. Brumback]

I hope you have a frequency already.if not, that is your first
pitfall. 2 meter frequencies are almost impossible to get in some parts. If
you have one this is the place to ask questions.
Randy

-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
Sent: Friday, February 01, 2008 4:59 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] new repeater



Hi,
I am building a 2 meter repeater. Am leaning towards Motorola surplus. 
Mitrek probably. Any suggestions or short cuts around bad pitfalls I 
may be coming to? Sure would like to use good equipment and save some $ 
too. I have researched Mitrek repeaters some but would like more input. 
I am planning nothing fancy. Only the basics.
Thanks, Collin
__
More new features than ever. Check out the new AOL Mail ! - 
http://webmail.  aol.com


 

RE: [Repeater-Builder] Karl invites you to join Zorpia

[R. K. Brumback]

If I want to make friends around the world I will get on HF. This crap
doesn't belong here.
Randy
 
 

-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Karl
Sent: Saturday, February 02, 2008 9:50 PM
To: repeater-builder
Subject: [Repeater-Builder] Karl invites you to join Zorpia





  




  Zorpia.com - Photos & Journals 



Hi repeater-builder, 

You are special! Your friend Karl, invites you to be a part of Zorpia! 




  _  


So what is Zorpia? 

Zorpia is a Global Online Community, where you will make friends from around
the world, and share your experiences through Journals, Photos, Videos and
more. Like a virtual online country, when you join Zorpia, you are not just
a member, but a 'Zorpian'.

Be a part of a special, rapidly growing group of people from all corners of
the world.

Join Zorpia today, and make your mark by using our range of fully
customizable pre-configured skins on your homepage.



 
 Join now for free! 
Karl's profile photo:

 
 



This message was delivered with the Karl's initiation.
If you wish to discontinue receiving invitations from us, please click here:
Block

future notifications
Copyright(c) 2003-2007 Zorpia.com  . All Rights
Reserved.   

 

[Repeater-Builder] Karl invites you to join Zorpia

[Karl]

   
Hi repeater-builder!
Your friend Karl from  , just invited you to  his  online photo albums and 
journals at Zorpia.com.



So what is Zorpia?
It is an online community that allows you to upload unlimited amount of photos, 
write journals and make friends. We also have a variety of skins in store for 
you so that you can customize your homepage freely.

Join now for free! Please click the following link to join Zorpia:
http://signup.zorpia.com/signup?invitation_key=200802f0f3ac503f510e54da26c91400&referral=Karl54499

This message was delivered with the Karl's initiation.

If you wish to discontinue receiving invitations from us, please click the 
following link:
http://signup.zorpia.com/email/optout/repeater-builder@yahoogroups.com

[Repeater-Builder] Mitrek repeater

[n4tua]

Hi,
I am building a 2 meter repeater. I was leaning towards Mitrek radios. 
Any ideas or warnings? Pitfalls to avoid? I am looking at doing the 
building and modifications myself and saving some $. Your help or 
suggestions will help me.
Thanks, Collin

More new features than ever.  Check out the new AOL Mail ! - 
http://webmail.aol.com

[Repeater-Builder] Midland Land Mobile Model 70-9020

[Trevor]

Hello group:I need pin out info on this radio of the rear power
connector so I can play with it !! any one help me outits 15 watt
800 mhz trunking 200 channel radio,, thin  black ,,with plastic bottom
cover...

any info or file locations on the net would be nice as well.. I hope
some one can help me..Ve3tlt   Trevor.

[Repeater-Builder] Micor Repeater - ID?

[Mike Benonis]

Good day,
I just picked up what I believe is a Micor repeater at a Hamfest  
today for free.  I'm told the repeater works, but I can't verify  
that.  Here's what I know about it:

Form Factor:   Rack-Mounted
Model Number:  C64RCB-3105AY
FCC Xmit Info: CC4224C
FCC Rcvr Info: RC0080
Frequency: 464.050 MHz (I assume this is TX, but it doesn't say  
specifically on the label)

Cards installed:
2x Four User Control Modules
1x Master Decoder
1x Squelch Gate
1x Station COntrol Module
1x Time Out Timer

It has a Motorola power supply in the rack at the bottom.  I didn't  
see any cans mounted in the rack, but I only found one N connector on  
the back (ublabeled, of course, but it looks like it comes out of a  
large silver box at the top of the rack with a heatsink on it.  I can  
provide photos of the unit if needed.

I'd like to convert this down to the 440 MHz amateur band if possible,  
for less than say, $1000 in new parts/repairs.  Can anyone tell me,  
based on the information given, if this seems like a reasonable thing  
to do?  If this is a boat anchor, I'm perfectly happy to get rid of it  
- but I figured, for free, what do I lose?


Best regards,

Mike Benonis
Electrical Engineering '09
Department of Drama Sound Engineer
The University of Virginia
[EMAIL PROTECTED]
KI4RIX

Re: [Repeater-Builder] FS: 37MHz Low Band Mitreks, Maratracs, JEDI chargers

[n4tua]

Eric,
How much for the  high band Mitrek? Shipped to Georgia, 31036?
Thanks, Collin



-Original Message-
From: kk2ed <[EMAIL PROTECTED]>
To: Repeater-Builder@yahoogroups.com
Sent: Fri, 1 Feb 2008 6:07 pm
Subject: [Repeater-Builder] FS: 37MHz Low Band Mitreks, Maratracs, JEDI 
chargers






I have the following 30-40MHz Low-Band Mitrek and Maratrac radios
for sale. All units are drawer only, with covers. NO Channel
Elements, NO power cords, etc. All were pulled from service and
placed in storage many years ago, so they are sold AS IS WHERE IS.

QTY – MODEL # - NOTES

QTY 1 - T51JJA4000DK (reed PL board with one ?? reed factory
jumpered for tx/rx)
QTY 1 – T51JJA4000AK (reed PL board with two 5Z reeds)

QTY 1 – T51JJA4900DL (chip PL board)
QTY 2 – T51JJA4000BK (chip PL board)
QTY 4 – T51JJA4000DK (chip PL board)

QTY 1 - ? High Band Mitrek (2 transistor PA deck)
(front face lable removed, so I don,t have the model #)

QTY 2 – T81XTA7DA2AK (2 good, on 37MHz)

QTY 2 – T81XTA7DA2BK (1 good unit, 1 missing two coils on control
logic board)
QTY 1 – T81XTA7TA7BK (missing control logic board)

QTY 1 – 16CH control head (8ch x 2 zones A&B), mic, power harness

QTY 3 – NTN7160A Std 10-hour JEDI series chargers with AC cubes (NEW
IN BOX)
QTY 2 – Extra AC cubes for above (new in box also)

Contact Eric KE2D
[EMAIL PROTECTED]
609-713-3742






More new features than ever.  Check out the new AOL Mail ! - 
http://webmail.aol.com

[Repeater-Builder] new repeater

[n4tua]

Hi,
I am building a 2 meter repeater. Am leaning towards Motorola surplus. 
Mitrek probably. Any suggestions or short cuts around bad pitfalls I 
may be coming to? Sure would like to use good equipment and save some $ 
too. I have researched Mitrek repeaters some but would like more input. 
I am planning nothing fancy. Only the basics.
Thanks, Collin

More new features than ever.  Check out the new AOL Mail ! - 
http://webmail.aol.com

[Repeater-Builder] Re: GTX Questions - (Repeater Controllers dealing with ctcss)

[skipp025]

Hi Doug, 

Yeah sometimes it can be cluster to get external generated 
CTCSS Tones inserted back into the GTX-900 radio transmit 
audio. I'd first check the rear accessory jack pin functions 
to see if and what any of the available "ports" can do to 
the transmit audio. 

The Motorhead (Motorola) mic-audio low frequency filters are 
probably so over engineered that blowing tones with the repeater 
audio isn't even worth trying/practical. 

Otherwise it's some type of hard wired connection/mod into 
the proper section of the radio internals. I asked him why 
he had the TP-3200 in the first place... "it was donation" 
so the price was right. Unless one really needs the mult-tone 
CTCSS encoding... program the GTX-900 radio up with the master 
tone frequency and use the TP-3200 to decode any & all the 
rx tones just to get on with life. 

cheers, 
skipp 

ps: C'ya at Dayton this year. 

> Doug Bade <[EMAIL PROTECTED]> wrote:
> Skipp;
> The specific controller he is using and was asking about is 
> a Comm Spec  ( TP3200 as I recall ) commercial repeater controller. 
> My comments were directed towards commercial not amateur 
> controllers...Commercial repeater controllers designed for multi-tone 
> community repeater applications etc...do in fact by necessity need to 
> strip and re-insert tones.. but your comment is quite true on the 
> average low/lower end amateur controller, most do not have sufficient 
> filtering to completely remove ctcss and a portion sneaks through 
> anyhow.. unless you add your own filter aka ts-64 as you point out...
> 
> Doug
> KD8B

Re: [Repeater-Builder] Intermod software

[Joe]

I just used RFS.EXE the other day to calculate passive intermodulation.  
It's my favorite program for years, but can only calculate hits on 
specific frequencies.  What the original question asked was how to 
calculate a frequency that will cause a known intermod.  I don't know of 
any software that will do this. 

73, Joe, K1ike

DCFluX wrote:
>
> Find software called RFS.exe, it is an older DOS program but it does 
> have an intermod calculator.
>
> On 2/2/08, *Ken Arck* <[EMAIL PROTECTED] > wrote:
>
> At 10:37 AM 2/2/2008, you wrote:
>
>> I suppose that could be done for a single unknown but more than
>> one unknown candidate frequency would result in unlimited
>> combinations. I would find useful a program that could handle
>> broadband candidate signal sources. I've used multiple narrowband
>> sources spaced appropriately to do this in the past. Very tedious
>> approach. Time to start coding - in my *free* time!
>>  
>
> <---Yea, I realize the possible combinations are essentially
> infinite (which is why I used the qualifier "probable").
>
> But I was thinking of something along the lines of being able to
> enter a range (for example, 145 to 148, 420 to 450, etc) that
> would limit the results and make both the calculations and results
> reasonable to plow through.
>
> I guess for now, the hit and miss approach is it!
>
> Ken
>
> 
> ---
> I am Shakespeare of Borg. Prepare to be or not to be 
>
>
>  

Re: [Repeater-Builder] Intermod software

[Ken Arck]

At 12:59 PM 2/2/2008, you wrote:

>Find software called RFS.exe, it is an older DOS program but it does 
>have an intermod calculator.

<---Does RFS allow for 3rd party variables?

(I already have IM software - that's not the issue)

Ken 

Re: [Repeater-Builder] Intermod software

[DCFluX]

Find software called RFS.exe, it is an older DOS program but it does have an
intermod calculator.

On 2/2/08, Ken Arck <[EMAIL PROTECTED]> wrote:
>
>  At 10:37 AM 2/2/2008, you wrote:
>
>  I suppose that could be done for a single unknown but more than one
> unknown candidate frequency would result in unlimited combinations. I would
> find useful a program that could handle broadband candidate signal sources.
> I've used multiple narrowband sources spaced appropriately to do this in the
> past. Very tedious approach. Time to start coding - in my *free* time!
>
>
>
> <---Yea, I realize the possible combinations are essentially infinite
> (which is why I used the qualifier "probable").
>
> But I was thinking of something along the lines of being able to enter a
> range (for example, 145 to 148, 420 to 450, etc) that would limit the
> results and make both the calculations and results reasonable to plow
> through.
>
> I guess for now, the hit and miss approach is it!
>
> Ken 
>
> ---
> I am Shakespeare of Borg. Prepare to be or not to be

Re: [Repeater-Builder] Re: GTX Questions - (Repeater Controllers dealing with ctcss)

[Doug Bade]

Skipp;

 The specific controller he is using and was asking about is 
a Comm Spec  ( TP3200 as I recall ) commercial repeater controller. 
My comments were directed towards commercial not amateur 
controllers...Commercial repeater controllers designed for multi-tone 
community repeater applications etc...do in fact by necessity need to 
strip and re-insert tones.. but your comment is quite true on the 
average low/lower end amateur controller, most do not have sufficient 
filtering to completely remove ctcss and a portion sneaks through 
anyhow.. unless you add your own filter aka ts-64 as you point out...

Doug
KD8B

At 01:42 PM 2/2/2008, you wrote:


> > The repeater controller normally strips off CTCSS/PL from the rx
> > audio from an incoming mobile by use of a high pass filter set to
> > roll off all below 300hz.
>
>It's a nice thought but most of the more common plane-jane
>repeater controllers seen around (available) have little or
>minimal filtering directed toward CTCSS Tone reduction included
>in their audio chains. Many plan-jane Repeater Controllers
>are fairly wide-band through the voice and ctcss audio range.
>
>Wide-band audio can be fairly problematic in some repeater
>system operations. Other times the wide-band audio controller
>throughput can be a desired operation (in linked radio
>systems as an example). It's all about how you plan your
>system layout.
>
>Hence one reason I like some of the CTCSS Boards, which
>include an available Sub-Tone Audio Filter Section. A long
>time Industry Standard external CTCSS Board with an available
>series filter section (which can also be gated on/off) is
>the famous Comm Spec TS-32 or TS-64 Models.
>
>http://www.repeater-builder.com/com-spec/com-spec-index.html
> 
>
>
>Route the desired receiver audio through your sub tone or notch
>filter section of choice before making the trip to the controller.
>
>Unless of course you want the CTCSS Information to go into the
>repeater controller. Some of the high-end repeater controllers
>are able to remove and decode CTCSS information presented to
>the audio input section.
>
>Life goes on (thankfully)...
>
>cheers,
>s.

RE: [Repeater-Builder] Intermod software

[Ken Arck]

At 10:37 AM 2/2/2008, you wrote:

I suppose that could be done for a single unknown but more than one 
unknown candidate frequency would result in unlimited combinations. 
I would find useful a program that could handle broadband candidate 
signal sources. I've used multiple narrowband sources spaced 
appropriately to do this in the past. Very tedious approach. Time to 
start coding - in my *free* time!




<---Yea, I realize the possible combinations are essentially infinite 
(which is why I used the qualifier "probable").


But I was thinking of something along the lines of being able to 
enter a range (for example, 145 to 148, 420 to 450, etc) that would 
limit the results and make both the calculations and results 
reasonable to plow through.


I guess for now, the hit and miss approach is it!

Ken
---
I am Shakespeare of Borg. Prepare to be or not to be

[Repeater-Builder] Re: IF-1600S self test issue

[Gary]

Hi Eric,

I have a 1600S, but I'm currently at work and do not have my manuals 
in front of me. I've never had a self test failure of any kind as of 
yet, so I cannot help you much. However, you might try posting your 
problem over in the general discussion area on the Batlabs site:

http://batboard.batlabs.com/

There is a gentleman that regulars there that is an employee of 
Aeroflex. I know he had a lot to do with design work on such sets as 
the Com120 and I believe the 2957. He is quite knowledgeable and may 
be able to guide you in the right direction. You might want to list 
your header as being "off topic" or "O.T." so someone does not jump 
all over you about a non Motorola related subject.

Good luck,
Gary

--- In Repeater-Builder@yahoogroups.com, "w2zt" <[EMAIL PROTECTED]> wrote:
>
> Hello,
> 
> I have an IFR-1600S service monitor that appears to work properly.
> 
> However, when I run its series of self tests, it fails the "low pass 
> filter" test. The maintenance manual I have doesn't  contain 
> schematics, nor does it speak to any of the self tests. Accordingly, 
I 
> have no idea which of the several low pass filters it's testing and 
> which one it thinks is malfunctioning.
> 
> Does anyone have any experience\knowledge of the self tests within 
> this series of test systems?
> 
> Eric
>

[Repeater-Builder] Re: GTX Questions - (Repeater Controllers dealing with ctcss)

[skipp025]

> The repeater controller normally strips off CTCSS/PL from the rx 
> audio from an incoming mobile by use of a high pass filter set to 
> roll off all below 300hz. 

It's a nice thought but most of the more common plane-jane 
repeater controllers seen around (available) have little or 
minimal filtering directed toward CTCSS Tone reduction included 
in their audio chains.  Many plan-jane Repeater Controllers 
are fairly wide-band through the voice and ctcss audio range. 

Wide-band audio can be fairly problematic in some repeater 
system operations. Other times the wide-band audio controller 
throughput can be a desired operation (in linked radio 
systems as an example). It's all about how you plan your 
system layout. 

Hence one reason I like some of the CTCSS Boards, which 
include an available Sub-Tone Audio Filter Section. A long 
time Industry Standard external CTCSS Board with an available 
series filter section (which can also be gated on/off) is 
the famous Comm Spec TS-32 or TS-64 Models. 

http://www.repeater-builder.com/com-spec/com-spec-index.html 

Route the desired receiver audio through your sub tone or notch 
filter section of choice before making the trip to the controller. 

Unless of course you want the CTCSS Information to go into the 
repeater controller. Some of the high-end repeater controllers 
are able to remove and decode CTCSS information presented to 
the audio input section. 

Life goes on (thankfully)... 

cheers,
s. 

RE: [Repeater-Builder] Intermod software

[Stu Benner]

I suppose that could be done for a single unknown but more than one unknown
candidate frequency would result in unlimited combinations. I would find
useful a program that could handle broadband candidate signal sources. I've
used multiple narrowband sources spaced appropriately to do this in the
past. Very tedious approach. Time to start coding - in my *free* time!
 
Stu
W3STU

-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Ken Arck
Sent: Saturday, February 02, 2008 13:05
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Intermod software



Every IM calculator I've seen only deals with those freqs entered 
into a list. All well and good when you're analyzing known factors 
but what if you're trying to nail down a mix/IM that is caused by an 
unknown third party (offsite) source?

Anyone know of such a program that will allow you to enter your 
site's freqs and give you *probable* other freqs that might cause a problem?

Ken
--
I am Shakespeare of Borg. Prepare to be or not to be



 

[Repeater-Builder] Re: GTX Questions (transmitter - ctcss/dcs and low frequency roll-off)

[skipp025]

The common transmitter input scheme for audio, data and various 
signaling can be thought of in at least three different paths. 

First is the common Mic Audio input, which in many but not all 
cases a fairly low level. Mic Audio in many but not all typical 
transmitters goes through a number of stages for processing and 
limiting before being applied to the actual transmitter modulator 
oscillator section. Many transmitter Mic Audio input paths (but 
not all) include a filter section to roll off low frequencies. 

The low frequency filter does more than simply reduce anyone's 
attempt to route CTCSS through the Mic Jack.  But the quality 
of various filters is only so good and does only so much, so 
there are cases where one can brute-force CTCSS in through the 
Mic Audio Path. 
Also consider many of the low frequency filters are designed to 
reduce their attenuation as the audio frequencies increase above 
the generic CTCSS frequency range (below about 250Hz . So a 
CTCSS frequency of 250.3 Hz will more easily blow-through the 
low frequency roll-off filter versus a much lower 77 Hz Tone. 
Something maybe to keep in mind when you pick your CTCSS 
Frequency of choice. 

The second audio route is a less restricted audio path not always 
mentioned or included with the initial transmitter information. 
This second path inserts the audio/signaling information past the 
Mic-Audio Sections. The many times labeled "wide-band", "direct", 
"signaling", "yadda, yadda" input path is considered to have 
little or minimal conditioning before reaching the modulator -
oscillator section of the transmitter. The actual voltage, drive 
requirement at the direct/wide-band input is more often done at 
a higher level versus the Mic Audio Input path. Normally minimal 
filters are in the path, CTCSS and other signaling information 
can also be applied here. In kit transmitters this more direct 
high level path still routes through the final Mic Audio Stage 
as a buffer or at least through the deviation level pot. 

The third possible transmitter input is what I might call the 
information or signaling point.  Many times this input is also 
a much more direct path to the transmitter's modulator/oscillator 
section. Most often this third path is used to insert a more 
constant level non-voice signaling information input, i.e. the 
CTCSS (PL), DCS (Digital-PL), or LTR-Trunking Data. Most often 
you will find this input path does not route through the deviation 
control (pot) and it's level is set using the level control at 
the signal source (the CTCSS board). 

Now on to your Motorola fun... 

Depending on your specific radio model... Motorola can and does 
offer a few different paths toward the transmitter modulator - 
oscillator section.  To be more flexible these paths can require 
internal (to the radio) simple jumpers to be set in the desired 
path direction. 

So a 16 pin Motorhead (Motorola) Radio might have a possible 
high level Tx-Audio input in the back, which can be configured 
to pass full "wide-band" (with CTCSS) or just the higher range 
voice audio information.  

The trick is the specific radio model and it's other possible 
applications as designed by Motorola. Radios that were intended 
for end-user mobile only operation might not have all the 
available external input and output ports and connections paths 
available. Without a detailed look at the GTX-900 Mobile Service 
Manual I'd guess to say this radio is probably not designed to 
be as flexible through the rear 16 pin jack connections.

If you're using this radio as a Repeater Transmitter, you can 
in the basic radio application setup a desired CTCSS/DCS Code 
right in the programming software, which is included when you 
key the radio through the front panel Mic-Jack. 

But like many other options keying the radio through the rear 
accessory jack path might transmit with only the bare bones 
carrier (RF) signal less any other signaling (CTCSS). Sometimes 
internal and external signaling paths are also controlled in 
available software options... sometimes the no free lunch rule 
applies. 

So depending on your method of keying and applying both voice 
audio and signaling information to the specific radio model... 
you may or may not end up with internal or external CTCSS/DCS 
on the transmitted signal. The hard part with less flexible 
radio models is to route more than one signaling (CTCSS/DCS) 
signal through the radio accessory jack when the various path options
are not normally made available with simple software and 
hardware configurations. 

All this can sometimes be a real head scratcher... 

cheers, 
s. 


> "n9wys" <[EMAIL PROTECTED]> wrote:
>
> No ideas yet on this?  
> 
> I'm wondering of the mic circuit rolls off the low freqs (where PL would
> normally be "found") and I need to use the Audio IN pin, or if it really
> makes any difference?  I suppose I could just take a ride and try
it, but if
> it DOESN'T make any difference I need to exami

[Repeater-Builder] Intermod software

[Ken Arck]

Every IM calculator I've seen only deals with those freqs entered 
into a list. All well and good when you're analyzing known factors 
but what if you're trying to nail down a mix/IM that is caused by an 
unknown third party (offsite) source?

Anyone know of such a program that will allow you to enter your 
site's freqs and give you *probable* other freqs that might cause a problem?

Ken
---
I am Shakespeare of Borg. Prepare to be or not to be

[Repeater-Builder] IF-1600S self test issue

[w2zt]

Hello,

I have an IFR-1600S service monitor that appears to work properly.

However, when I run its series of self tests, it fails the "low pass 
filter" test. The maintenance manual I have doesn't  contain 
schematics, nor does it speak to any of the self tests. Accordingly, I 
have no idea which of the several low pass filters it's testing and 
which one it thinks is malfunctioning.

Does anyone have any experience\knowledge of the self tests within 
this series of test systems?

Eric

RE: [Repeater-Builder] GTX Questions

[Doug Bade]

I would need to see a manual to identify specific inputs as I am not 
a GTX guru My reply was more in generalities to help you hunt for 
what you need...What are the inputs you speak of labeled as??? Maybe 
we can sort it out??

and YES you always can cheat and let the GTX do encode my only 
complaint in doing that is the repeater controller can be set up to 
NOT encode during CW id, and make it quieter to users in off hours 
:-), but if the repeater transmitter sends tone all the time, it 
would be negated. Remote basing off a repeater that does not encode 
during hang time is also much easier.:-) In general I think most 
repeater operators like to only encode while decoding if that is an option

Doug

At 10:48 AM 2/2/2008, you wrote:

>Doug,
>
>OK - so to simplify (if I understand this correctly) I should feed the "PL
>Audio" into the GTX on Pin 11 and keep Voice Audio on Pin 2?
>
>Or even go more simply and just allow the GTX to generate the PL... Again -
>I'm using a ComSpec TP-3200 as my controller.
>
>Thanks!
>Mark - N9WYS

Re: [Repeater-Builder] GTX Questions

[Doug Bade]

Mark;
After re-reading my reply I may need to clarify a point or 3 :-)

The repeater controller normally strips off CTCSS/PL from the rx 
audio from an incoming mobile by use of a high pass filter set to 
roll off all below 300hz. The controller decodes it first if it has 
that feature but it is stripped out... The controller, if so equipped 
( in this case it is) will regenerate a new CTCSS/PL signal  and 
encodes it out on a separate lead destined for an ENCODE input of the 
repeater transmitter, NOT the MIC input as that is filtered as well 
to strip low freq audio below 300 hz. The only exception is if the 
radio transmitter has a PAGING ( or now days 9600 baud FSK ) audio 
input, this input is normally flat pretty much from DC to 
daylight (at least through the whole audio pass band) In that 
case it IS POSSIBLE to shove both encode and voice into that port but 
is probably going to sound like garbage as it will have harmonic 
mix's that sound nasty..

SO NORMALLY there is a separate ENCODE port into the modulator, that 
is NOT the mic jack, or the MIC circuit ... that is defined for 
encoding tones below 300hz as a separate path entirely through the 
transmitter.. In synthesized radios it is normally a port coming 
pretty much from the microprocessor which generates the tone/dpl, 
after it is processed , filtered and cleaned up.. If you can SPOT 
this port, you can break the circuit and insert your own encode here 
( again we are talking about a conversion mobile transmitter not a 
Mastr II / Micor etc.. that have dedicated CTCSS inputs... It is 
normally directly into the circuit of the VCO reference oscillator or 
very close to it as the CTCSS/PL can be viewed as a frequency 
aberration to the PLL loop filter if it is injected to late into the 
circuit like where the voice modulation is input.. Low freq DPL/CTCSS 
looks like an "unlock condition" to the loop filter /PLL if it is 
present in the normal voice process... and the PLL will try to 
"CORRECT" itself which would have the result of either killing the 
"aberration"  or severely messing with it to "FIX" the problem.

This loop filter/ PLL correction issue is a key factor in hooking up 
FSK stuff like 9600 baud packet ( Or D-Star as we are soon going to 
be seeing) into a radio .. as the modulation input is NOT linear 
across the audio pass band and the low freq rolloff KILLS 9600 baud 
components that approach DC in frequency under normal 
circumstances...UNLESS it is specifically engineered to do that ( 
some are ) or the loop filter component values can be changed to make 
it less concerned about low frequency aberrations ( more specifically 
slow the integration time so they are ignored). Radios with Packet 
inputs ( for 9600 FSK) have already dealt with the engineering side 
but you still need to match audio impedances to keep the processing clean.

Doug
KD8B

RE: [Repeater-Builder] GTX Questions

[n9wys]

Doug,

OK - so to simplify (if I understand this correctly) I should feed the "PL
Audio" into the GTX on Pin 11 and keep Voice Audio on Pin 2?

Or even go more simply and just allow the GTX to generate the PL...  Again -
I'm using a ComSpec TP-3200 as my controller.

Thanks!
Mark - N9WYS

-Original Message-
From: Repeater-Builder@yahoogroups.com On Behalf Of Doug Bade

I was not monitoring the thread but the answer is 
ALL radios I am aware of require a separate 
CTCSS/PL input into a different port into the 
modulator for CTCSS/PL as the audio circuits have 
a high pass filter which cuts off any audio 
leaking through below 300hz. A received mobiles 
pl tone will be dropped ( although it will be 
decoded and processed accordingly) from the 
repeated audio processed by the controller panel.

If that audio is entered into the mic jack of the 
repeater transmitter, it will again be filtered out.

The encode mod must be fed into the modulator 
separately of the repeater transmitter, from your 
tone panel encode output. If you look at the 
modulator schematic you should see the port where 
the ENCode enters the modulator, it is usually 
into the pll /vco subsystem. as it is normally 
direct FM so DPL can be processed correctly...as 
the radio can normally do both.

If no one can identify the specific connection 
for you, I can pull the manual later and look for 
it. Most REPEATER type systems have a clearly 
identified external port for this but a mobile 
may not be so clearly marked... but it IS there as it is used by the radio..

Alternate plan B is to program the GTX for encode 
and let it's local CPU handle it...

Doug
KD8B
At 10:10 AM 2/2/2008, you wrote:

>No ideas yet on this?
>
>I'm wondering of the mic circuit rolls off the 
>low freqs (where PL would normally be "found") 
>and I need to use the Audio IN pin, or if it 
>really makes any difference?  I suppose I could 
>just take a ride and try it, but if it DOESN'T 
>make any difference I need to examine other 
>options for getting PL back on the output - like 
>reprogramming the radio for PL transmit rather than CSQ.
>
>Thanks,
>
>Mark - N9WYS
>
>
>
>--- Original Message ---
>
>From: n9wys [mailto:[EMAIL PROTECTED]
>Sent: Monday, January 28, 2008 2:10 PM
>
>OK, I just got my 900 machine back up and 
>running again this morning.  For those who don't 
>remember, this is a MaxTrac Receiver / Com Spec 
>TP-3200 controller / GTX exciter / Motorola STF2520A paging PA arrangement.
>
>Anyhow - the machine had no audio output at all. 
>nada, zilch. only a dead key.  I changed out the 
>GTX and this restored the transmit audio - I can 
>now hear voice audio and the ID-er being passed 
>by the repeater.  However, one problem remains: 
>it is still not encoding PL tone.  (So if you 
>are in the area and plan on using the machine, 
>be sure to use CSQ receive for now.)
>
>I have checked and double-checked the panel 
>programming and output - it is encoding the 
>tone.  What I wonder is if the audio circuit in 
>the GTX is scrubbing off the tone coming from 
>the panel?  If so, I can reprogram the GTX for 
>tone encode on TX, but I'd prefer to use the 
>panel's tone.  (Currently, the GTX is programmed 
>for CSQ transmit.)  Also, I'm using Pin 2 (Ext 
>MIC) for the audio input. should I be using Pin 11 (Flat RX audio) instead?
>
>Is this an issue that was previously referred to 
>on the list - one regarding a factory add-on module/fix??
>
>
>
>Mark - N9WYS
 

Re: [Repeater-Builder] GTX Questions

[Doug Bade]

I was not monitoring the thread but the answer is 
ALL radios I am aware of require a separate 
CTCSS/PL input into a different port into the 
modulator for CTCSS/PL as the audio circuits have 
a high pass filter which cuts off any audio 
leaking through below 300hz. A received mobiles 
pl tone will be dropped ( although it will be 
decoded and processed accordingly) from the 
repeated audio processed by the controller panel.

If that audio is entered into the mic jack of the 
repeater transmitter, it will again be filtered out.

The encode mod must be fed into the modulator 
separately of the repeater transmitter, from your 
tone panel encode output. If you look at the 
modulator schematic you should see the port where 
the ENCode enters the modulator, it is usually 
into the pll /vco subsystem. as it is normally 
direct FM so DPL can be processed correctly...as 
the radio can normally do both.

If no one can identify the specific connection 
for you, I can pull the manual later and look for 
it. Most REPEATER type systems have a clearly 
identified external port for this but a mobile 
may not be so clearly marked... but it IS there as it is used by the radio..

Alternate plan B is to program the GTX for encode 
and let it's local CPU handle it...

Doug
KD8B
At 10:10 AM 2/2/2008, you wrote:

>No ideas yet on this?
>
>I’m wondering of the mic circuit rolls off the 
>low freqs (where PL would normally be “found”) 
>and I need to use the Audio IN pin, or if it 
>really makes any difference?  I suppose I could 
>just take a ride and try it, but if it DOESN’T 
>make any difference I need to examine other 
>options for getting PL back on the output – like 
>reprogramming the radio for PL transmit rather than CSQ.
>
>Thanks,
>
>Mark – N9WYS
>
>
>
>--- Original Message ---
>
>From: n9wys [mailto:[EMAIL PROTECTED]
>Sent: Monday, January 28, 2008 2:10 PM
>
>OK, I just got my 900 machine back up and 
>running again this morning.  For those who don’t 
>remember, this is a MaxTrac Receiver / Com Spec 
>TP-3200 controller / GTX exciter / Motorola STF2520A paging PA arrangement.
>
>Anyhow – the machine had no audio output at all… 
>nada, zilch… only a dead key.  I changed out the 
>GTX and this restored the transmit audio – I can 
>now hear voice audio and the ID-er being passed 
>by the repeater.  However, one problem remains: 
>it is still not encoding PL tone.  (So if you 
>are in the area and plan on using the machine, 
>be sure to use CSQ receive for now…)
>
>I have checked and double-checked the panel 
>programming and output – it is encoding the 
>tone.  What I wonder is if the audio circuit in 
>the GTX is scrubbing off the tone coming from 
>the panel?  If so, I can reprogram the GTX for 
>tone encode on TX, but I’d prefer to use the 
>panel’s tone.  (Currently, the GTX is programmed 
>for CSQ transmit.)  Also, I’m using Pin 2 (Ext 
>MIC) for the audio input… should I be using Pin 11 (Flat RX audio) instead?
>
>Is this an issue that was previously referred to 
>on the list – one regarding a factory add-on module/fix??
>
>
>
>Mark – N9WYS
>

[Repeater-Builder] GTX Questions

[n9wys]

No ideas yet on this?  

I'm wondering of the mic circuit rolls off the low freqs (where PL would
normally be "found") and I need to use the Audio IN pin, or if it really
makes any difference?  I suppose I could just take a ride and try it, but if
it DOESN'T make any difference I need to examine other options for getting
PL back on the output - like reprogramming the radio for PL transmit rather
than CSQ. 

Thanks,

Mark - N9WYS

 

--- Original Message ---

From: n9wys [mailto:[EMAIL PROTECTED] 
Sent: Monday, January 28, 2008 2:10 PM



OK, I just got my 900 machine back up and running again this morning.  For
those who don't remember, this is a MaxTrac Receiver / Com Spec TP-3200
controller / GTX exciter / Motorola STF2520A paging PA arrangement.

Anyhow - the machine had no audio output at all. nada, zilch. only a dead
key.  I changed out the GTX and this restored the transmit audio - I can now
hear voice audio and the ID-er being passed by the repeater.  However, one
problem remains: it is still not encoding PL tone.  (So if you are in the
area and plan on using the machine, be sure to use CSQ receive for now.)

I have checked and double-checked the panel programming and output - it is
encoding the tone.  What I wonder is if the audio circuit in the GTX is
scrubbing off the tone coming from the panel?  If so, I can reprogram the
GTX for tone encode on TX, but I'd prefer to use the panel's tone.
(Currently, the GTX is programmed for CSQ transmit.)  Also, I'm using Pin 2
(Ext MIC) for the audio input. should I be using Pin 11 (Flat RX audio)
instead?

Is this an issue that was previously referred to on the list - one regarding
a factory add-on module/fix??

 

Mark - N9WYS

Re: [Repeater-Builder] 220 MHz. Amplifier?

[WD7F - John in Tucson]

Here's my design for a power amp used on a Micor high band VHF converstion. 
Not for the faint of heart.

http://home.comcast.net/~micorrepeater/  Check out the PA link at the top.

de WD7F
John in Tucson

- Original Message - 
From: "Robin Midgett" <[EMAIL PROTECTED]>
To: 
Sent: Friday, February 01, 2008 6:23 PM
Subject: [Repeater-Builder] 220 MHz. Amplifier?


I have a friend who's looking for a 80 or so watt amplifier for his
224.84 MHz. repeater. Is there a recommended product for this
application these days? Mods or kit building are welcomed, as are
leads on plug-n-play solutions.

Thank you,
Robin Midgett K4IDC
VHF+ Glutton EM66se
6, 2, 222, 432, working on the rest!






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