RE: [Repeater-Builder] Today's funny two-way radio story (March 09). The Siren - PA Speaker War

[Butch Kanvick]

Then the car would be too easy to spot!

The only one with the antenna on the roof near the windshield

 

The rest were mounted on the trunks.

 

It would be easy to locate in the parking lot though.

 

Maybe even add a flag to it???

 

LOL

 

Butch, KE7FEL/r


 


To: Repeater-Builder@yahoogroups.com
From: k...@catonic.us
Date: Sun, 8 Mar 2009 22:14:43 -0600
Subject: RE: [Repeater-Builder] Today's funny two-way radio story (March 09). 
The Siren - PA Speaker War





On Sun, 8 Mar 2009, Butch Kanvick wrote:
> I am not sure how they patched the hole in the roof.

By mounting an antenna in it. :-)

--
Kris Kirby, KE4AHR
Disinformation Analyst

RE: [Repeater-Builder] Today's funny two-way radio story (March 09). The Siren - PA Speaker War

[Kris Kirby]

On Sun, 8 Mar 2009, Butch Kanvick wrote:
> I am not sure how they patched the hole in the roof.

By mounting an antenna in it. :-)

--
Kris Kirby, KE4AHR
Disinformation Analyst

RE: [Repeater-Builder] Today's funny two-way radio story (March 09). The Siren - PA Speaker War

[Butch Kanvick]

Yes, the one for the low band antenna mount.

 

That would probably worked great.

LOL

 

Butch, KE7FEL/r
 


To: Repeater-Builder@yahoogroups.com
From: a...@comcast.net
Date: Sun, 8 Mar 2009 16:38:12 -0400
Subject: Re: [Repeater-Builder] Today's funny two-way radio story (March 09). 
The Siren - PA Speaker War






Didn't Motorola have a rubber plug for that?
I recall it was quite a bit larger than the NMO hole plug.

Butch Kanvick wrote:
> 
> 
> We had one law enforcement officer that checked his shotgun while it was 
> mounted in the shotgun lock, which was attached to the dash.
> 
> I think his ears are still ringing from the explosion of the shotgun 
> going off and the resulting hole in the roof.
> 
> Try to explain that to the Captain when you have to see the review board.
> 
> The officer then had to train the rest of the officers about the safe 
> way to check your shotgun. Double OO buck shot
> 
> I am not sure how they patched the hole in the roof.
> 
> Butch, KE7FEL/r
> 
> 

[Repeater-Builder] Re: DB duplexer question

[ka9gfs]

--- In Repeater-Builder@yahoogroups.com, "Jeff DePolo"  wrote:
>
> > All the DM 4076 pictures show roung cans,
> 
> The round can versions came later, first tan in color, then grey, then
> ultimately Decibel "Tek Black".  The square ones were the earliest ones -
> they started out a lighter tan (lighter than yours), and then went to that
> mocha color like you have.  As for the harness, the type of cable, and the
> length of the cables, changed several times over the manufacturing lifetime
> of the series, and not necessarily corresponding with changes in exterior
> paint color.  
> 
> > What has hapened is my grandson removet the cables and i need a 
> > location to where the go. do you have any cable dem? as showen 
> > on the picture I have two cables that most have went to the Tee, 
> > they are different size.
> 
> If you measure the cables you have, I can tell you which vintage it most
> likely is, and also tell you what the factory standard configuration for the
> cavities was.  Note that there was some asymmetry in those cavities - the
> directional orientation of the cavity as installed in the harness will make
> it perform better as a high-pass cavity and by reversing it it will work
> better low-pass.  You're going to need real test equipment in order to
> figure out which is which if you have any doubt as to how they are currently
> arranged if you want them to work optimally.
> 
>   --- Jeff WN3A
>
Jeff here you go 

12"
8 5/8 "
10"
8 1/2"

The two short ones are the cav conecters. the others are for the Tee.

Dave Ka9gfs

RE: [Repeater-Builder] Re: DB duplexer question

[Jeff DePolo]

> All the DM 4076 pictures show roung cans,

The round can versions came later, first tan in color, then grey, then
ultimately Decibel "Tek Black".  The square ones were the earliest ones -
they started out a lighter tan (lighter than yours), and then went to that
mocha color like you have.  As for the harness, the type of cable, and the
length of the cables, changed several times over the manufacturing lifetime
of the series, and not necessarily corresponding with changes in exterior
paint color.  

> What has hapened is my grandson removet the cables and i need a 
> location to where the go. do you have any cable dem? as showen 
> on the picture I have two cables that most have went to the Tee, 
> they are different size.

If you measure the cables you have, I can tell you which vintage it most
likely is, and also tell you what the factory standard configuration for the
cavities was.  Note that there was some asymmetry in those cavities - the
directional orientation of the cavity as installed in the harness will make
it perform better as a high-pass cavity and by reversing it it will work
better low-pass.  You're going to need real test equipment in order to
figure out which is which if you have any doubt as to how they are currently
arranged if you want them to work optimally.

--- Jeff WN3A

Re: [Repeater-Builder] Re:Today's two-way radio story v 2.0: mechanic vs Quik-Call

[MCH]

I bet OSHA would be very interested in that 'rule'.

Joe M.

Gary Glaenzer wrote:
> nope 
>  
> company rule, radios remain 'ON'
>  
> this is the company that had a 4-inch -thick binder with 10-12 pages of 
> installation instructionsfor every type of vehicle in the fleet
>  
> and after you got done installing one, the local engineer would come out 
> with his tape measure and God help you if you were off by more than 1/2" 
> of where the specs said each component went
>  
>  
>  
>  
> 
> - Original Message -
> *From:* MCH 
> *To:* Repeater-Builder@yahoogroups.com
> 
> *Sent:* Saturday, March 07, 2009 3:58 PM
> *Subject:* Re: [Repeater-Builder] Re:Today's two-way radio story v
> 2.0: mechanic vs Quik-Call
> 
> You would think he would have been smart enough to shut the radio off
> first...
> 
> Joe M.
> 
> Gary Glaenzer wrote:
>  > true story circa 1981
>  >
>  > Illinois Power Company vehicle
>  >
>  > these had the Motorola's with 'Quik-Call' hooked to horn and lights
>  >
>  > 'won't blow the horn' was the complaint
>  >
>  > it did, but very weak horn sound
>  >
>  > find horn stuffed with oil-soaked shop towels
>  >
>  > investigation revelaed 'the guys' thought it was great fun to set
> it off
>  > when the mechanic had his head under the hood
>  >
>  > so he took 'corrective action'
>  >
>  > Gary
>  >
>  >
>  >
>  > - Original Message -
>  > *From:* skipp025  >
>  > *To:* Repeater-Builder@yahoogroups.com
> 
>  >  >
>  > *Sent:* Saturday, March 07, 2009 10:39 AM
>  > *Subject:* [Repeater-Builder] Today's funny two-way radio story
>  > (March 09). The Siren - PA Speaker War
>  >
>  > Re: Today's funny two-way radio story (March 09).
>  >
>  > The Siren - PA Speaker War
>  >
>  > Today's very funny story was told to me by a friend after my
>  > seeing the evidence in a shop.
>  >
>  > A service call to fix the Siren on a Public Safety Vehicle
>  > with reported problematic volume level. Most radio type service
>  > people have a test method or routine to find the failed speaker,
>  > pa amplifier, broken wire or blown fuse.
>  >
>  > Lots of output voltage to the vehicle front mounted speaker,
>  > the type of which are sometimes problematic from weather/water
>  > damage. Off to the front bumper...
>  >
>  > Can't seem to get the speaker cone off... normally a tight but
>  > not a frozen screw-on fit. Out come the serious tools to break
>  > the speaker cone free.
>  >
>  > So... after a lot of work the cone comes off and there's a
>  > permanent thread locking glue on the cone threads. Hummm...?
>  >
>  > Wait! there's foam and a rubber plug inside the cone..? Someone
>  > wanted to reduce the speaker output level and lock it in place?
>  >
>  > Care to guess what's going on..?
>  >
>  > Well Sailors...
>  >
>  > A bit of detective work to figure out the owner of the vehicle
>  > has/had a habit of testing his full volume PA & Siren functions
>  > very early every morning, while pulling out of his house/drive way.
>  >
>  > One of his nearby neighbors didn't appreciate the everyday wake
>  > up call and finally did the foam/rubber plug muffle trick and
>  > mounting thread lock to the bumper mounted siren speaker cone.
>  >
>  > Life goes on...
>  >
>  > Epilog:
>  >
>  > I/we do use the rubber plug and foam trick to reduce PA - Siren
>  > Volume levels while testing equipment. Helps on hearing and
>  > annoyance levels.
>  >
>  > Your results will probably vary...
>  >
>  > cheers,
>  > s.
>  >
>  > --
>  >
>  >
>  >
>  > Checked by AVG - www.avg.com
>  > Version: 8.0.237 / Virus Database: 270.11.8/1987 - Release Date:
>  > 03/06/09 07:20:00
>  >
>  >
>  >
>  >
>  >
>  >
>  > --
>  >
>  > No virus found in this incoming message.
>  > Checked by AVG.
>  > Version: 7.5.557 / Virus Database: 270.11.8/1987 - Release Date:
> 3/6/2009 7:20 AM
> 
> 
> 
> 
> 
> Checked by AVG - www.avg.com
> Version: 8.0.237 / Virus Database: 270.11.8/1987 - Release Date:
> 03/06/09 07:20:00
> 
> 
> 
> 
> 
> 
> 
> 
> No virus found in this incoming 

[Repeater-Builder] Harness for a db224.....

[georgiaskywarn]

in the Atlanta area? Who in this area sells db products stuff?
Robert
KD4YDC
ps Contact info?

Re: [Repeater-Builder] Today's funny two-way radio story (March 09). The Siren - PA Speaker War

[Mike Naruta AA8K]

Didn't Motorola have a rubber plug for that?
I recall it was quite a bit larger than the NMO hole plug.



Butch Kanvick wrote:
> 
> 
> We had one law enforcement officer that checked his shotgun while it was 
> mounted in the shotgun lock, which was attached to the dash.
> 
> I think his ears are still ringing from the explosion of the shotgun 
> going off and the resulting hole in the roof.
>  
> Try to explain that to the Captain when you have to see the review board.
>  
> The officer then had to train the rest of the officers about the safe 
> way to check your shotgun. Double OO buck shot
>  
> I am not sure how they patched the hole in the roof.
>  
> Butch, KE7FEL/r
>  
>  

Re: [Repeater-Builder] Today's funny two-way radio story (March 09). The Siren - PA Speaker War

[Don Kupferschmidt]

And the way things are going in the world these days, I'll bet even money that 
he made law enforcement officer of the year !

Don, KD9PT

  - Original Message - 
  From: Butch Kanvick 
  To: repeater-builder@yahoogroups.com 
  Sent: Sunday, March 08, 2009 1:43 PM
  Subject: RE: [Repeater-Builder] Today's funny two-way radio story (March 09). 
The Siren - PA Speaker War


  We had one law enforcement officer that checked his shotgun while it was 
mounted in the shotgun lock, which was attached to the dash.

  I think his ears are still ringing from the explosion of the shotgun going 
off and the resulting hole in the roof.
   
  Try to explain that to the Captain when you have to see the review board. 
   
  The officer then had to train the rest of the officers about the safe way to 
check your shotgun. Double OO buck shot
   
  I am not sure how they patched the hole in the roof.
   
  Butch, KE7FEL/r
   
   

--
  To: Repeater-Builder@yahoogroups.com
  From: a...@comcast.net
  Date: Sun, 8 Mar 2009 07:49:41 -0400
  Subject: Re: [Repeater-Builder] Today's funny two-way radio story (March 09). 
The Siren - PA Speaker War

  A siren test every morning?
  What a great idea.

  I think I'll test my car horn and
  shotgun every morning when I get up.

  Nate Duehr wrote:
  > 
  > 
  > 
  > On Mar 7, 2009, at 12:23 PM, Daniel Fargo wrote:
  > 
  > > Yes that is a good one I liked it also. You just never know what
  > > neighbors will do.
  > You mean that idiot that used to test his siren next door, every
  > morning? :-)
  > 
  > Just kidding...
  > 
  > Nate WY0X
  > 





  

RE: [Repeater-Builder] DB duplexer Question

[Mark]

Dave,

 

These look similar to the Motorola T1504 series duplexers, but not exactly.
Look here.  http://www.repeater-builder.com/motorola/t1500.html 

Your best bet is to follow Eric's suggestion and call DB Spectra for the
exact application and specifications.

 

Other than that, it appears as if the other short jumper (which would go to
a "T" in the center of the assembly) is either missing, or attached to the
cavity to the left in your photo.

 

Mark - N9WYS

 

From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Dave
Sent: Sunday, March 08, 2009 10:46 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] DB duplexer Question

 

I acquired this DB duplexer and need information.  The cables were not
connected correctly.  However I do have them.

It is for the 440 band I do know.

First question.  What would be a good guess of the model # ?

Second question, does anyone have the correct cable lengths and where they
go? 

Attached are some pictures.

 

Thanks,

 

Dave   KA9GFS

 

 








No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.0.237 / Virus Database: 270.11.9/1989 - Release Date: 03/07/09
18:43:00

<>

[Repeater-Builder] Re: DB duplexer question

[ka9gfs]

--- In Repeater-Builder@yahoogroups.com, "DOUG"  wrote:
>
> Dave,
> This looks similar to the same setup I have that came out of a Mastr II 
> repeater. They are definitely pass only. Those little cap covers in between 
> the N connectors are actually just threaded screws to fill the holes where 
> the trimmer caps would go on the DB-4076 Pass/Reject duplexer.
> 
> It looks to be part of a combining system but missing the lower panel that 
> included a circulator and dummy load for the transmitter.
> I have included a crude drawing of how it is connected together.
> I have 2 sets of these. One set actually has "TRIPLEXER" stamped on the DB 
> metal nameplate and the other set has "COMBINER" on it's nameplate.
> The SP numbers on mine are a little different which show "SP 5236-1"
> 
> These were used for combining 2 different receivers to a single antenna. The 
> "auxiliary" receiver was used for different control functions to the repeater.
> 
> The top far left can is tuned for the auxiliary receiver frequency. The can 
> next to it is tuned for the repeater receiver frequency.
> Then of course, the 2 right and bottom right cans are tuned for the 
> transmitter frequency.
> 
> This might not be exactly the same type setup but looks close.
> Hope this possibly helps??
> 
> 73,
> Doug 
> N4TZD
>

Doug, thanks for info, I have been asking a few questions from the sorce where 
i got them, He said it was pulled from a GE mastr II and the Tee was taken off 
before he pulled it, I looked at the cap covers between the N connecters and 
there is a trimer cap. 

All the DM 4076 pictures show roung cans,What has hapened is my grandson 
removet the cables and i need a location to where the go. do you have any cable 
dem? as showen on the picture I have two cables that most have went to the Tee, 
they are different size.

tks 
Dave 

RE: [Repeater-Builder] Today's funny two-way radio story (March 09). The Siren - PA Speaker War

[Butch Kanvick]

We had one law enforcement officer that checked his shotgun while it was 
mounted in the shotgun lock, which was attached to the dash.


I think his ears are still ringing from the explosion of the shotgun going off 
and the resulting hole in the roof.

 

Try to explain that to the Captain when you have to see the review board. 

 

The officer then had to train the rest of the officers about the safe way to 
check your shotgun. Double OO buck shot

 

I am not sure how they patched the hole in the roof.

 

Butch, KE7FEL/r

 

 


To: Repeater-Builder@yahoogroups.com
From: a...@comcast.net
Date: Sun, 8 Mar 2009 07:49:41 -0400
Subject: Re: [Repeater-Builder] Today's funny two-way radio story (March 09). 
The Siren - PA Speaker War





A siren test every morning?
What a great idea.

I think I'll test my car horn and
shotgun every morning when I get up.

Nate Duehr wrote:
> 
> 
> 
> On Mar 7, 2009, at 12:23 PM, Daniel Fargo wrote:
> 
> > Yes that is a good one I liked it also. You just never know what
> > neighbors will do.
> You mean that idiot that used to test his siren next door, every
> morning? :-)
> 
> Just kidding...
> 
> Nate WY0X
> 

Re: [Repeater-Builder] Understanding Intermod

[no6b]

At 3/7/2009 20:31, you wrote:
>Kevin,
>
>I recall a case where several UHF community repeaters were installed at a
>single site.  This was not a pretty picture since there was no way to achive
>vertical seperation and transmitter combiners/receiver multicouplers were
>not as popular as they are today.  An intermod study weas run on the site
>and at either the 5th or 7th order, every receiver on the site should have
>been experiencing intermod from a combination of all the transmitters.  Of
>course this was not the case.  It was just the program spitting out all the
>possible combinations that "COULD" cause a problem.

...which is why I've never bothered with IMD programs.  Put it up; if it 
works it works.  If there's IMD usually the demoded audio in the mix will 
tell you who's involved in the mix.  Even then, knowing what frequencies 
are involved doesn't help you determine which rusty tower joint is actually 
producing the mix.

The last mix problem I was faced with ended up being a 2A-B, with my output 
being the 2A & the B a commercial repeater 5 MHz above my output.  The mix 
ended up occurring in the front end of an Icom VHF/UHF multimode radio 
plugged into an antenna about 30' from the repeater antenna; unplugging the 
UHF port of the radio eliminated it.  Knowing the frequencies involved in 
the mix played no part in the determination of the source.

Bob NO6B

RE: [Repeater-Builder] DB duplexer Question

[Eric Lemmon]

Dave,

I don't have to guess about the model number- it's printed on the label.
But, you won't find this unit in a Decibel Products catalog, because it's a
custom-made device as indicated by the "SP" in the model number.  Although
your unit could be a duplexer that is missing one jumper and a tee connector
for the antenna lead, it may also be two separate bandpass pairs mounted on
one rack panel.

Your best course of action is to contact DB Spectra- the company that now
sells and services the site management equipment formerly made by Decibel
Products- and ask for the technical details and tuning instructions.
Provide the exact model and serial numbers as shown on the labels.  You can
contact DB Spectra at .  If the sales staff are
clueless, call the company at 469-322-0080 and speak to one of the tech
support people at extension 26- many of whom were brought over from the
Decibel Products plant.

73, Eric Lemmon WB6FLY
 

-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Dave
Sent: Sunday, March 08, 2009 8:46 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] DB duplexer Question

I acquired this DB duplexer and need information.  The cables were not
connected correctly.  However I do have them.  It is for the 440 band I do
know.

First question.  What would be a good guess of the model # ?  Second
question, does anyone have the correct cable lengths and where they go? 

Attached are some pictures. 

Thanks, 

Dave   KA9GFS

Re: [Repeater-Builder] DB duplexer Question

[William Becks]

Dave,

My guess is that the duplexer was manufactured for Motorola by Decibel Products 
from the SP-x on the model identification plate as pictured in your photos. 
 The duplexer appears to be a pass band type circuit from the separate input 
and output coupling loops on each filter and from the apparent lack of any 
notch adjustments.

Normally, there would be a Tee at the junction of the two inside cavities to 
form the antenna port.  All interconnecting cables are typically 1/4 wave 
electrical length between cavities to include those connecting to the Tee at 
antenna port.  You'll have to measure the existing cables and then do the math 
and apply the correct VP for the cable type in use at the intended frequency of 
operation.  My guess is that they are a bit short for work in the 70 Cm ham 
band.

Bill, WA8WG


From: Dave 
Sent: Sunday, March 08, 2009 10:45 AM
To: Repeater-Builder@yahoogroups.com 
Subject: [Repeater-Builder] DB duplexer Question



I acquired this DB duplexer and need information.  The cables were not 
connected correctly.  However I do have them.

It is for the 440 band I do know.

First question.  What would be a good guess of the model # ?

Second question, does anyone have the correct cable lengths and where they go? 

Attached are some pictures.



Thanks,



Dave   KA9GFS

RE: [Repeater-Builder] DB duplexer Question

[Jeff DePolo]

It looks like an older DB-4076.  However, the model # on the sticker shows
it's an "SP" (special production) model.

Between the type N connectors there is a little cap.  Remove that cap - do
you see a trimmer cap inside?  If so, it's likely it's a DB-4076 or close
relative.  If not, then the cavities aren't pass-reject like they would be
in a DB-4076; instead they are pass-only.

If you're certain that this originally was a duplexer, and that the cables
that are attached are truely the factory-originals, then you should just
need to add a tee.  However, if you're unsure, and given that it's an SP
model, it's hard to say with 100% certainty.

--- Jeff WN3A

> -Original Message-
> From: Repeater-Builder@yahoogroups.com 
> [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Dave
> Sent: Sunday, March 08, 2009 11:46 AM
> To: Repeater-Builder@yahoogroups.com
> Subject: [Repeater-Builder] DB duplexer Question
> 
> I acquired this DB duplexer and need information.  The cables 
> were not connected correctly.  However I do have them.
> 
> It is for the 440 band I do know.
> 
> First question.  What would be a good guess of the model # ?
> 
> Second question, does anyone have the correct cable lengths 
> and where they go? 
> 
> Attached are some pictures.
> 
>  
> 
> Thanks,
> 
>  
> 
> Dave   KA9GFS
> 
>  
> 
>  
> 
> 
> 
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 8.0.237 / Virus Database: 270.11.3/1970 - Release 
> Date: 03/07/09 18:43:00
> 
> 
> 

Re: [Repeater-Builder] Understanding Intermod

[Gary Glaenzer]

Milt;

Not to make light of your observation "just the program spitting out all the 
combinations that COULD cause a problem"

But..this discussion brought to mind a statement made by a Motorola 
engineer at a school about multicouplers, splitters, combiners, etc back in 
1984; they were discussing the multitude of repeaters on the John Hancock 
building (or maybe it was Sears Tower) in Chicago

"One 'wrong' frequency allowed onto a site can 'poison' the site for everyone"

I guess that means run the IM program BEFORE any new TX is added...not after 
problems crop up

Gary




  - Original Message - 
  From: Milt 
  To: Repeater-Builder@yahoogroups.com 
  Sent: Saturday, March 07, 2009 10:31 PM
  Subject: Re: [Repeater-Builder] Understanding Intermod


  Kevin,

  I recall a case where several UHF community repeaters were installed at a 
  single site. This was not a pretty picture since there was no way to achive 
  vertical seperation and transmitter combiners/receiver multicouplers were 
  not as popular as they are today. An intermod study weas run on the site 
  and at either the 5th or 7th order, every receiver on the site should have 
  been experiencing intermod from a combination of all the transmitters. Of 
  course this was not the case. It was just the program spitting out all the 
  possible combinations that "COULD" cause a problem.

  All intermod programs just do the mathmatical combinations and report the 
  outcomes, even outragous ones that are not likely to naturally occur. Some 
  do a better job than others of taking into account things like receiver 
  bandwidth and other factors. Actually finding the source where the mix is 
  taking place much more difficult. The benefit of such programs is that they 
  can easily do the math for you, but you have to decide which numbers are 
  good possibilities and which ones are red herrings.

  Milt
  N3LTQ

  - Original Message - 
  From: "Kevin King" 
  To: 
  Sent: Saturday, March 07, 2009 8:59 PM
  Subject: RE: [Repeater-Builder] Understanding Intermod

  > Bob Ok so much for the software.
  >
  > One other user today mentioned a possible issue with another repeater.
  > 147.300. All I had been looking at with the software were the transmitters
  > at his site.
  >
  > Ok so I plug that into the mix of xmiters in the software and bingo.
  >
  > A+B-C 146.70 + 146.70 - 147.30 = 146.100.
  >
  > The repeater 146.70 does have a circulator.
  >
  > Again this intermod is not my best area. I had the repeater owner keep the
  > 146.700 xmitter up them had him hit the 147.30 with an HT and yep we got a
  > burp of noise. But he heard at least 3 repeaters come up.
  >
  > So if this mix is the one that is causing all the issues, now we just need
  > to find where the mix is occurring. Any ideas on where to look?
  >
  > As you can see in the full printout from the intermod tool. There are more
  > that one set of possible offenders.
  >
  > -Original Message-
  > From: Repeater-Builder@yahoogroups.com
  > [mailto:repeater-buil...@yahoogroups.com] On Behalf Of n...@no6b.com
  > Sent: Saturday, March 07, 2009 3:47 PM
  > To: Repeater-Builder@yahoogroups.com
  > Subject: Re: [Repeater-Builder] Understanding Intermod
  >
  > At 3/7/2009 08:59, you wrote:
  >
  >>I did a analysis on a transmitter site using the TCS intermod tool to see
  >>what mixes could be causing some issues at this site. I ran the 1-3 order
  >>and 1 to 5 order.
  >>
  >>
  >>
  >>So I do not use these tools much and was wondering if any of my fellow
  >>engineers on here have used this tool and have comments on the output. For
  >>example this line from the output confuses me:
  >>
  >>A+B+C-D-E: 146.7 + 145.77000 + 145.09000 - 145.73000 - 145.73000 =
  > 146.10
  >>
  >>It is a hit right on the input but how do you minus 145.73 twice? Is this
  >>just an issue with the program I am using?
  >
  > I should say 146.700 + 145.770 + 145.090 - 2 * 145.730 = 146.100
  >
  > It's actually an A+B+C-2D mix.
  >
  > Bob NO6B
  >
  >
  >
  > 
  >
  >
  >
  > Yahoo! Groups Links
  >
  >
  >
  >
  >
  > 
  >
  >
  >
  > Yahoo! Groups Links
  >
  >
  >



  


--




  Checked by AVG - www.avg.com 
  Version: 8.0.237 / Virus Database: 270.11.9/1989 - Release Date: 03/07/09 
18:43:00

RE: [Repeater-Builder] DB duplexer Question

[Mike Mullarkey]

Hi Dave,

 

You need a N Male T and the cables should work fine. I like to use the
outside of the cans for the TX & RX connections but to each his own. It will
work the way you have it just add the T.

 

Mike

 

Colorado Telecom, L.L.C

Mike Mullarkey

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 Dave
Sent: Sunday, March 08, 2009 9:46 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] DB duplexer Question

 

I acquired this DB duplexer and need information.  The cables were not
connected correctly.  However I do have them.

It is for the 440 band I do know.

First question.  What would be a good guess of the model # ?

Second question, does anyone have the correct cable lengths and where they
go? 

Attached are some pictures.

 

Thanks,

 

Dave   KA9GFS

 

 

Re: [Repeater-Builder] Understanding Intermod

[Milt]

Kevin,

I recall a case where several UHF community repeaters were installed at a 
single site.  This was not a pretty picture since there was no way to achive 
vertical seperation and transmitter combiners/receiver multicouplers were 
not as popular as they are today.  An intermod study weas run on the site 
and at either the 5th or 7th order, every receiver on the site should have 
been experiencing intermod from a combination of all the transmitters.  Of 
course this was not the case.  It was just the program spitting out all the 
possible combinations that "COULD" cause a problem.

All intermod programs just do the mathmatical combinations and report the 
outcomes, even outragous ones that are not likely to naturally occur.  Some 
do a better job than others of taking into account things like receiver 
bandwidth and other factors.  Actually finding the source where the mix is 
taking place much more difficult.  The benefit of such programs is that they 
can easily do the math for you, but you have to decide which numbers are 
good possibilities and which ones are red herrings.


Milt
N3LTQ


- Original Message - 
From: "Kevin King" 
To: 
Sent: Saturday, March 07, 2009 8:59 PM
Subject: RE: [Repeater-Builder] Understanding Intermod


> Bob Ok so much for the software.
>
> One other user today mentioned a possible issue with another repeater.
> 147.300. All I had been looking at with the software were the transmitters
> at his site.
>
> Ok so I plug that into the mix of xmiters in the software and bingo.
>
> A+B-C 146.70 + 146.70 - 147.30 = 146.100.
>
> The repeater 146.70 does have a circulator.
>
> Again this intermod is not my best area. I had the repeater owner keep the
> 146.700 xmitter up them had him hit the 147.30 with an HT and yep we got a
> burp of noise. But he heard at least 3 repeaters come up.
>
> So if this mix is the one that is causing all the issues, now we just need
> to find where the mix is occurring. Any ideas on where to look?
>
> As you can see in the full printout from the intermod tool. There are more
> that one set of possible offenders.
>
> -Original Message-
> From: Repeater-Builder@yahoogroups.com
> [mailto:repeater-buil...@yahoogroups.com] On Behalf Of n...@no6b.com
> Sent: Saturday, March 07, 2009 3:47 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: Re: [Repeater-Builder] Understanding Intermod
>
> At 3/7/2009 08:59, you wrote:
>
>>I did a analysis on a transmitter site using the TCS intermod tool to see
>>what mixes could be causing some issues at this site. I ran the 1-3 order
>>and 1 to 5 order.
>>
>>
>>
>>So I do not use these tools much and was wondering if any of my fellow
>>engineers on here have used this tool and have comments on the output. For
>>example this line from the output confuses me:
>>
>>A+B+C-D-E: 146.7 + 145.77000 + 145.09000 - 145.73000 - 145.73000 =
> 146.10
>>
>>It is a hit right on the input but how do you minus 145.73 twice? Is this
>>just an issue with the program I am using?
>
> I should say 146.700 + 145.770 + 145.090 - 2 * 145.730 = 146.100
>
> It's actually an A+B+C-2D mix.
>
> Bob NO6B
>
>
>
> 
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
> 
>
>
>
> Yahoo! Groups Links
>
>
>

Re: [Repeater-Builder] Re:Today's two-way radio story v 2.0: mechanic vs Quik-Call

[Gary Glaenzer]

nope  

company rule, radios remain 'ON'

this is the company that had a 4-inch -thick binder with 10-12 pages of 
installation instructionsfor every type of vehicle in the fleet

and after you got done installing one, the local engineer would come out with 
his tape measure and God help you if you were off by more than 1/2" of where 
the specs said each component went




  - Original Message - 
  From: MCH 
  To: Repeater-Builder@yahoogroups.com 
  Sent: Saturday, March 07, 2009 3:58 PM
  Subject: Re: [Repeater-Builder] Re:Today's two-way radio story v 2.0: 
mechanic vs Quik-Call


  You would think he would have been smart enough to shut the radio off 
  first...

  Joe M.

  Gary Glaenzer wrote:
  > true story circa 1981
  > 
  > Illinois Power Company vehicle
  > 
  > these had the Motorola's with 'Quik-Call' hooked to horn and lights
  > 
  > 'won't blow the horn' was the complaint
  > 
  > it did, but very weak horn sound
  > 
  > find horn stuffed with oil-soaked shop towels
  > 
  > investigation revelaed 'the guys' thought it was great fun to set it off 
  > when the mechanic had his head under the hood
  > 
  > so he took 'corrective action'
  > 
  > Gary
  > 
  > 
  > 
  > - Original Message -
  > *From:* skipp025 
  > *To:* Repeater-Builder@yahoogroups.com
  > 
  > *Sent:* Saturday, March 07, 2009 10:39 AM
  > *Subject:* [Repeater-Builder] Today's funny two-way radio story
  > (March 09). The Siren - PA Speaker War
  > 
  > Re: Today's funny two-way radio story (March 09).
  > 
  > The Siren - PA Speaker War
  > 
  > Today's very funny story was told to me by a friend after my
  > seeing the evidence in a shop.
  > 
  > A service call to fix the Siren on a Public Safety Vehicle
  > with reported problematic volume level. Most radio type service
  > people have a test method or routine to find the failed speaker,
  > pa amplifier, broken wire or blown fuse.
  > 
  > Lots of output voltage to the vehicle front mounted speaker,
  > the type of which are sometimes problematic from weather/water
  > damage. Off to the front bumper...
  > 
  > Can't seem to get the speaker cone off... normally a tight but
  > not a frozen screw-on fit. Out come the serious tools to break
  > the speaker cone free.
  > 
  > So... after a lot of work the cone comes off and there's a
  > permanent thread locking glue on the cone threads. Hummm...?
  > 
  > Wait! there's foam and a rubber plug inside the cone..? Someone
  > wanted to reduce the speaker output level and lock it in place?
  > 
  > Care to guess what's going on..?
  > 
  > Well Sailors...
  > 
  > A bit of detective work to figure out the owner of the vehicle
  > has/had a habit of testing his full volume PA & Siren functions
  > very early every morning, while pulling out of his house/drive way.
  > 
  > One of his nearby neighbors didn't appreciate the everyday wake
  > up call and finally did the foam/rubber plug muffle trick and
  > mounting thread lock to the bumper mounted siren speaker cone.
  > 
  > Life goes on...
  > 
  > Epilog:
  > 
  > I/we do use the rubber plug and foam trick to reduce PA - Siren
  > Volume levels while testing equipment. Helps on hearing and
  > annoyance levels.
  > 
  > Your results will probably vary...
  > 
  > cheers,
  > s.
  > 
  > --
  > 
  > 
  > 
  > Checked by AVG - www.avg.com
  > Version: 8.0.237 / Virus Database: 270.11.8/1987 - Release Date:
  > 03/06/09 07:20:00
  > 
  > 
  > 
  > 
  > 
  > 
  > --
  > 
  > No virus found in this incoming message.
  > Checked by AVG. 
  > Version: 7.5.557 / Virus Database: 270.11.8/1987 - Release Date: 3/6/2009 
7:20 AM


  


--




  Checked by AVG - www.avg.com 
  Version: 8.0.237 / Virus Database: 270.11.8/1987 - Release Date: 03/06/09 
07:20:00

Re: [Repeater-Builder] MSR2000

[Bill Smith]

The MSR2000 PA is all UHF. Multiplication is done on the exciter board. RF 
output of the exciter is around 1/2 watt.
 
Bill
KB1MGH

--- On Sun, 3/8/09, mike  wrote:


From: mike 
Subject: [Repeater-Builder] MSR2000
To: Repeater-Builder@yahoogroups.com
Date: Sunday, March 8, 2009, 6:34 AM


I need some info on the UHF MSR2000 PA. Is the tripler section of the UHF 
MSR2000 located in the PA it self? I have a UHF MSR2000 and was thinking of 
using it for a link transmitter. I looked on the MSR section here but didn't 
see anything about the tripler.
Thanks for any help in adavance
Mike







Yahoo! Groups Links

Re: [Repeater-Builder] Today's funny two-way radio story (March 09). The Siren - PA Speaker War

[Mike Naruta AA8K]

A siren test every morning?
What a great idea.

I think I'll test my car horn and
shotgun every morning when I get up.



Nate Duehr wrote:
> 
> 
> 
> On Mar 7, 2009, at 12:23 PM, Daniel Fargo wrote:
> 
>  > Yes that is a good one I liked it also. You just never know what
>  > neighbors will do.
> You mean that idiot that used to test his siren next door, every
> morning? :-)
> 
> Just kidding...
> 
> Nate WY0X
> 

[Repeater-Builder] MSR2000

[mike]

I need some info on the UHF MSR2000 PA. Is the tripler section of the UHF 
MSR2000 located in the PA it self? I have a UHF MSR2000 and was thinking of 
using it for a link transmitter. I looked on the MSR section here but didn't 
see anything about the tripler.
Thanks for any help in adavance
Mike