Re: [Repeater-Builder] Re: [Motorola] MSR2000 PA Transistors

[Mark Holman]

Say Neil;
  XYL would have a fit If I did that ! and I still have 
whatever in the Attic

M. H.

- Original Message - 
From: "Neil McKie" <[EMAIL PROTECTED]>
To: 
Sent: Monday, January 03, 2005 6:25 PM
Subject: Re: [Repeater-Builder] Re: [Motorola] MSR2000 PA Transistors


>
>
>  People have been wondering why I seem to 'collect' all those old
> used Motorola and GE radios.  I usually 'collect' them at swapmeets
> when the sellers can't give them away (except to me.)
>
>  I finally unloaded almost all of the tube gear except one - even
> donated a GE MT-16 to a friend in the San Francisco Bay area
> sometime back.
>
>  Why not?  The manufacturers quit supporting them years ago.
>
>  I have Motorola back to the later Motracs, Mocom-70's, Micors and
> Mitreks.
>
>  I have RCA to Series 700.
>
>  I have GE in Mastr-Pro (very nice radio) Exec II and Mastr II.
>
>  Those here who have seen my garage will ... groan ...
>
>  Get down to your local ham swapmeet and start catching up.  Of
> course, you'll raise the price to me ... but the parts will be used
> by someone and not hit the scrap yard.
>
>  Neil - WA6KLA
>
>
> skipp025 wrote:
>>
>> Do what most of us are doing, buy used Motorola
>> radios of the same era/type and lift the transistors
>> from surplus radios.
>>
>> I purchased 40 used mitrek 110 watt radios for
>> replacement UHF MSR PA Modules. Although the
>> remove and replace process takes some 3 plus
>> hours of serious work, the much lower cost
>> offsets the financial pain.
>>
>> The same would apply with with the VHF pa, which
>> also depends on whick of the 3 or 4 known VHF
>> PA versions you have.
>>
>> Ebay and the surplus radio dealers are good part
>> sources.
>>
>> cheers,
>> skipp
>> skipp025 at yahoo.com
>> www.radiowrench.com/sonic
>>
>> > > Anyone know where I can find MSR2000 finals?
>> > > I have a high band VHF MSR2000 with 2 blown
>> > > finals (one set), and would like to replace
>> > > all 4 if I can find a set of replacement transistors
>>
>>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
> 





 
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Re: [Repeater-Builder] Mobile Repeaters?

[russ]

Well they don't bother each outer and there is room for all the duplexers.
So I guess there is no reason not to run them they way they are set up as
they are not broke.
Russ, W3CH

- Original Message - 
From: "Jim B." <[EMAIL PROTECTED]>
To: 
Sent: Monday, January 03, 2005 5:10 PM
Subject: Re: [Repeater-Builder] Mobile Repeaters?


>
> russ wrote:
>
> > Jim and the group,
> > We have the TKR-850 ver. 2 running at 40 watts
> > in the Com van and feeding a DB 408 using TX/RX station duplexer works
fine.
> > In the same rack is a TKR-750 (147) and a Maggiore R-1 (222) they all
work
> > just fine and do not bother each outer at all.
> > Why would you have to run the TKR-850 on low power?
> > 73 Russ, W3CH
>
> Running that much power in a communications van *WILL, REPEAT, WILL*,
> cause interference to other radios in the van, and is TOTALLY
> UNECESSARY! 10-20 watts is PLENTY for a 'portable' repeater.
> And in most communcation van environments, there is not enough room for
> anything the size of a 2M or even a 220 duplexer. A 10 watt UHF repeater
> in a communcations van with a 3dB gain antenna on 30' to 60' of mast is
> quite adequate for anything you would need a repeater in a comm-van for.
> If you need more coverage then that, you need to deploy more then just a
> comm-van anyway.
> Of the active comm-vans I am familiar with, only one has a repeater on
> board, and it never gets used in a response, cause it usually causes
> more problems then it cures, to the extent that they are thinking of
> pulling it.
> -- 
> Jim Barbour
> WD8CHL
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>





 
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[Repeater-Builder] Re: [Motorola] MSR2000 PA Transistors

[Gary]

About a year and a half ago I replaced the whole board on my VHF 
MSR2000 110 watt NCD PA. (My PA had more problems than just the 
transistors) I used the PA board out of a 110 watt mitrek mobile.
It took me an afternoon to do it as I recall. I had to remove the 
power control circuitry and change some values of some resistors on 
the input side of the mobile PA, but it still works great today with 
a nice clean output.

MSR2000 PA's are notorius for failing, especially the NCD units. You 
could not back the power down enough and still maintain a clean 
output, no matter how much air you blew on and out of the PA. The CD 
units faired a little better, but those darn ham operators could fry 
them too! Ha! Ha!

Gary  KB7TRP


--- In Repeater-Builder@yahoogroups.com, Neil McKie <[EMAIL PROTECTED]> 
wrote:
> 
>   People have been wondering why I seem to 'collect' all those old 
>  used Motorola and GE radios.  I usually 'collect' them at 
swapmeets 
>  when the sellers can't give them away (except to me.) 
> 
>   I finally unloaded almost all of the tube gear except one - even 
>  donated a GE MT-16 to a friend in the San Francisco Bay area 
>  sometime back. 
> 
>   Why not?  The manufacturers quit supporting them years ago.  
> 
>   I have Motorola back to the later Motracs, Mocom-70's, Micors 
and 
>  Mitreks. 
> 
>   I have RCA to Series 700. 
> 
>   I have GE in Mastr-Pro (very nice radio) Exec II and Mastr II. 
> 
>   Those here who have seen my garage will ... groan ... 
> 
>   Get down to your local ham swapmeet and start catching up.  Of 
>  course, you'll raise the price to me ... but the parts will be 
used 
>  by someone and not hit the scrap yard. 
> 
>   Neil - WA6KLA 
> 
> 
> skipp025 wrote:
> > 
> > Do what most of us are doing, buy used Motorola
> > radios of the same era/type and lift the transistors
> > from surplus radios.
> > 
> > I purchased 40 used mitrek 110 watt radios for
> > replacement UHF MSR PA Modules. Although the
> > remove and replace process takes some 3 plus
> > hours of serious work, the much lower cost
> > offsets the financial pain.
> > 
> > The same would apply with with the VHF pa, which
> > also depends on whick of the 3 or 4 known VHF
> > PA versions you have.
> > 
> > Ebay and the surplus radio dealers are good part
> > sources.
> > 
> > cheers,
> > skipp
> > skipp025 at yahoo.com
> > www.radiowrench.com/sonic
> > 
> > > > Anyone know where I can find MSR2000 finals?
> > > > I have a high band VHF MSR2000 with 2 blown
> > > > finals (one set), and would like to replace
> > > > all 4 if I can find a set of replacement transistors
> > 
> >







 
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Re: [Repeater-Builder] Rusty Bolt effect and noise floor questions

[Mark Holman]

Matt & All,
   If you have any ground connections going to the body just grab a 
piece of sandpaper Disconnect your  Batt leads on both sides on Ford & 
Dodges a battery terminal brush you will need to clean, also sugguestion get 
those felt chem. treated Washers and place on the bottom, keeps corrosion 
down.

on Fords the short 6 or 8 inch cable on the older V-8 engines they usually 
go to the starter selonoid rust sometimes does and does not give problems, 
but that 12 inch or less black wire leads I noted all manufacturers will 
have corrosion of a different kind clean that area also.

Inspectr your B + and B- wires for cracking , any acceosory wires usually 
are crimped, I wind up soldering them.

I had a 1976 Chevy Caprice the Neg. Black cable corrode out and a Ham freind 
& I was heading to a Hamfest the #12 short wire began to smoke, we took his 
car instead and later I replaced the Battery cable and that short ground 
jumper.

Corrosion is resistance and that may cause some oddball static  WD-40 & 
Liquid Wrench are the best 2  to lossen parts up ,a and LPS in a Green Can 
one of them can actually waterproof a ground.

M. H.

- Original Message - 
From: "Matt" <[EMAIL PROTECTED]>
To: 
Sent: Monday, January 03, 2005 7:33 AM
Subject: Re: [Repeater-Builder] Rusty Bolt effect and noise floor questions


>
> Hi Joe and Scott,
>
> Thanks for your replies.
>
> Yes, I did the test as described in the article and like you Joe, I did 
> one
> more step which was to key the transmitter and check for desense. The 
> SINAD
> reading on the meter didn't change when I keyed up.
>
> Its a "proper" commercial antenna the repeater group purchased and its 
> only
> been up since early November so I'm hoping its not my own antenna :-)
>
> I do like the idea of taking an AM receiver to site and having a listen
> around. I hadn't thought of that and will do this as soon as I can.
>
> I wonder if oiling the dodgy connection causing this rusty bolt effect 
> would
> temporarily stop it, meaning I could identify the culprit?
>
> Best wishes all and thanks for the replies.
>
> Matt
> G4RKY
> - Original Message - 
> From: "Joe" <[EMAIL PROTECTED]>
> To: 
> Sent: Monday, January 03, 2005 8:34 AM
> Subject: Re: [Repeater-Builder] Rusty Bolt effect and noise floor 
> questions
>
>
>
> It's not desense that he has, it is loss of sensitivity.  If he did the
> sensitivity test as stated on the article Chris wrote, the transmitter is
> not active.
> http://www.repeater-builder.com/tech-info/effectivesens.html
> I take the test one step more and transmit during the sensitivity test to
> look for desense.
>
> 73, Joe, k1ike
>
> At 08:17 PM 1/2/2005, you wrote:
>>Desense in the neighborhood of 17 db. is a definite
>>possibility. The source of the desense can be inadequate attenuation of 
>>the
>>transmitter and receiver frequencies by the appropriate sections of your
>>duplexer or, and in fact, wideband noise produced within your antenna or
>>other 'hardware" in it's vicinity due to poor connections and or corrosion
>>when excited by your transmitter.
>
> All outgoing email scanned with Norton AntiVirus2004.
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
> 





 
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[Repeater-Builder] FS LIST

[Q]

1-GE MastrII 75 watt cont.duty UHF repeater on 443/449 rack mount with
Sinclair 4 cavity res-loc duplexer,GE UHS preamp and 4 wire audiocard,
working fine,in service now. No controller $700

1-GE MastrII 110 watt cont.duty VHF repeater on 146 in 4' cabinet with a GE
ferro-resonant 30 amp power supply-no duplexer or controller $600

1-GE MastrExecII 40 watt desktop base station w/mic on 463,CG $125

1-GE MLS-2,45 watts,8 ch scan on 10 meters $100

1-GE MastrII 110 watt VHF mobile power amp,4 transistor model $75

2-GE MastrII ferro-resonant power supply 24/12 volts(for800mhz stations) 
$50ea.

Plus shipping from 16504,pick-up preferred
PLEASE REPLY DIRECT TO res0s7nd"at"verizon"dot"net ,thanks for looking...






 
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Re: [Repeater-Builder] Motorola Flexars - Sell?

[Mark Holman]

The Ni-Cads you could possible replace just 
take some hunting around for a Moto Dealer who may have some sitting on a shelf 
someplace, I kinda have my doubts about aftermarkets after reading someones cell 
phone exploded with a aftermarket battery ( probably made at the cheapest rice 
factory  { or maybe prison factory } ).
 
Rest of the gear just looking around to see 
what programming it will take.
 
 
M. H.

  - Original Message - 
  From: 
  NØATH 
  To: Repeater-Builder@yahoogroups.com 
  
  Sent: Monday, January 03, 2005 2:11 
  AM
  Subject: [Repeater-Builder] Motorola 
  Flexars - Sell?
  
  I have a friend that sent me the following 
  e-mail: Are there any Motorola fans out there that can tell me what could be 
  done with these? These rigs are in EXTREMELY good condition - Look New.( 
  The repeaters ( I haven't seen the HT's )). I don't know if they have PL, DPL, 
  any type of an ID or what in them. Are they of value at all? My friend is 
  getting along in years and doesn't want to try and build anything from 
  them.
   
   
  >Dave / what could be done with 2 
  Motorola Flexar base repeaters on 469.775 mhz DPL 3l5, probably about 
  >10 maybe 25 watts, these were used in a large metal warehouse for 
  communications by the maintenance >crew, the H/T's had 6 
  channels, 469.775; 464.775;466.100; & simplex 461.100; 469.775; 
  466.100.the >Motorola H/T's were HT600's. Do not have any manuals. 
  Do have 2 small turnstyle antennas to go with the 
  >repeaters.
   
  Can anybody help me with info on these? Are they 
  useable on the amateur bands or worthwhile to try to convert? I think the 
  talkies are probably all with drop in chargers and everything was being used 
  when the 
  warehouse went belly up. I wouldn't hazard a 
  guess on the condition of the Ni-cads. Probably some good /some bad. They have 
  all been off for a period of time.
   
  Dave / 
  NØATH













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Re: [Repeater-Builder] Re: [Motorola] MSR2000 PA Transistors

[Neil McKie]

  People have been wondering why I seem to 'collect' all those old 
 used Motorola and GE radios.  I usually 'collect' them at swapmeets 
 when the sellers can't give them away (except to me.) 

  I finally unloaded almost all of the tube gear except one - even 
 donated a GE MT-16 to a friend in the San Francisco Bay area 
 sometime back. 

  Why not?  The manufacturers quit supporting them years ago.  

  I have Motorola back to the later Motracs, Mocom-70's, Micors and 
 Mitreks. 

  I have RCA to Series 700. 

  I have GE in Mastr-Pro (very nice radio) Exec II and Mastr II. 

  Those here who have seen my garage will ... groan ... 

  Get down to your local ham swapmeet and start catching up.  Of 
 course, you'll raise the price to me ... but the parts will be used 
 by someone and not hit the scrap yard. 

  Neil - WA6KLA 


skipp025 wrote:
> 
> Do what most of us are doing, buy used Motorola
> radios of the same era/type and lift the transistors
> from surplus radios.
> 
> I purchased 40 used mitrek 110 watt radios for
> replacement UHF MSR PA Modules. Although the
> remove and replace process takes some 3 plus
> hours of serious work, the much lower cost
> offsets the financial pain.
> 
> The same would apply with with the VHF pa, which
> also depends on whick of the 3 or 4 known VHF
> PA versions you have.
> 
> Ebay and the surplus radio dealers are good part
> sources.
> 
> cheers,
> skipp
> skipp025 at yahoo.com
> www.radiowrench.com/sonic
> 
> > > Anyone know where I can find MSR2000 finals?
> > > I have a high band VHF MSR2000 with 2 blown
> > > finals (one set), and would like to replace
> > > all 4 if I can find a set of replacement transistors
> 
>





 
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Re: [Repeater-Builder] Sale items.

[Kevin Custer]

[EMAIL PROTECTED] wrote:

> I don't recall seeing items listed for sale on this list.
>  Is that OK to do?


If you ask the list owner

Kevin





 
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RE: [Repeater-Builder] Mobile Repeaters?

[Dakota Summerhawk]

Cant drop the 2M side of things as a lot of hams don’t have 70CM around here
and 2M will do what 70CM wont in the mountains when runs and races require
2M am looking at a few suggestions for the van right now that might work.
Couple of emails on Motorola gear, either one or two channel radios and a
controller and duplexer for the rigs that I need.
Thanks for all the help!
Dakota

-Original Message-
From: Jim B. [mailto:[EMAIL PROTECTED] 
Sent: Monday, January 03, 2005 1:50 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Mobile Repeaters?



Dakota Summerhawk wrote:

> Is the best way to have a mobile repeater up and running with two 
> mobile radios and a duplexer? Looking for a way to be able to run a 
> couple of repeaters, one VHF, one UHF for a mobile communications van. 
> Can anyone recommend ways to cut down on weight and space? Thanks
> Dakota
> 

Best way to cut space-forget about the VHF unit. For UHF, get a Kenwood 
TKR-850 and a mobile duplexer. Keep the transmit power down to 20W or 
less, more then that will cause problems with other radios in the van, 
and get the antenna as far away from other antennas as possible, 
preferably on a 30' or more mast.

-- 
Jim Barbour
WD8CHL





 
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[Repeater-Builder] Cable on DB4001-1 Length

[w9mwq]

I am going to use two of the Decibel Products DB-4001-1 Filters on 
the receive side of my repeater once I connect a preamp this week.  
What I need to know is, is there a certain length the cable has to 
be between the two cavities that connects them together as well as 
between the preamp and the filters?  

Mathew








 
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[Repeater-Builder] System Status, west

[Neil McKie]

  ... snip ... 

> -   -   -   -   -   
> If only Bill Gates had a nickel for every time Windows crashed.
> OH! Wait!  he does!





 
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Re: [Repeater-Builder] Rusty Bolt effect and noise floor questions

[Joe]

Water has been used to spray on joints to see if the
noise goes away.  You can also use WD-40 to spray the
joints, but that's up to the tower owner as it can
make a mess.

What kind of an antenna are you using?  I use a
groundplane that has a folded driven element.  This
keeps the antenna at DC ground.  My opinion is that it
is a quieter antenna because of this.

73, Joe, k1ike

--- Matt <[EMAIL PROTECTED]> wrote:

> I wonder if oiling the dodgy connection causing this
> rusty bolt effect would temporarily stop it, meaning
> I could identify the culprit?





 
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[Fwd: [Repeater-Builder] TEST EQUIPMENT FS]

[Q]

I have the following test equipment for sale:

1-GE Personal Radio adapter 4EX12A12
1-Motorola microphone tester VGC
1-Heathkit IT-21 tube checker,nice
1-Mercury Model 204 tube tester,no charts
1-Sencore 60mhz Dual Trace oscilloscope
1-Cushman CE-5 service monitor 

CONTACT ME DIRECT to res0s7ng"at"verizon"dot"net






 







 
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[Repeater-Builder] Re: Speakers (was speaker level mixing)

[kc7gf]

Mike, I think I've got that Bluesmobile rooftop speaker in my garage somewhere.
 
Art - KC7GF













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Re: [Repeater-Builder] Mobile Repeaters?

[Jim B.]

russ wrote:

> Jim and the group,
> We have the TKR-850 ver. 2 running at 40 watts
> in the Com van and feeding a DB 408 using TX/RX station duplexer works fine.
> In the same rack is a TKR-750 (147) and a Maggiore R-1 (222) they all work
> just fine and do not bother each outer at all.
> Why would you have to run the TKR-850 on low power?
> 73 Russ, W3CH

Running that much power in a communications van *WILL, REPEAT, WILL*, 
cause interference to other radios in the van, and is TOTALLY 
UNECESSARY! 10-20 watts is PLENTY for a 'portable' repeater.
And in most communcation van environments, there is not enough room for 
anything the size of a 2M or even a 220 duplexer. A 10 watt UHF repeater 
in a communcations van with a 3dB gain antenna on 30' to 60' of mast is 
quite adequate for anything you would need a repeater in a comm-van for. 
If you need more coverage then that, you need to deploy more then just a 
comm-van anyway.
Of the active comm-vans I am familiar with, only one has a repeater on 
board, and it never gets used in a response, cause it usually causes 
more problems then it cures, to the extent that they are thinking of 
pulling it.
-- 
Jim Barbour
WD8CHL





 
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Re: [Repeater-Builder] Mobile Repeaters?

[russ]

Jim and the group,
We have the TKR-850 ver. 2 running at 40 watts
in the Com van and feeding a DB 408 using TX/RX station duplexer works fine.
In the same rack is a TKR-750 (147) and a Maggiore R-1 (222) they all work
just fine and do not bother each outer at all.
Why would you have to run the TKR-850 on low power?
73 Russ, W3CH

- Original Message - 
From: "Jim B." <[EMAIL PROTECTED]>
To: 
Sent: Monday, January 03, 2005 3:49 PM
Subject: Re: [Repeater-Builder] Mobile Repeaters?


>
> Dakota Summerhawk wrote:
>
> > Is the best way to have a mobile repeater up and running with two mobile
> > radios and a duplexer? Looking for a way to be able to run a couple of
> > repeaters, one VHF, one UHF for a mobile communications van. Can anyone
> > recommend ways to cut down on weight and space?
> > Thanks
> > Dakota
> >
>
> Best way to cut space-forget about the VHF unit. For UHF, get a Kenwood
> TKR-850 and a mobile duplexer. Keep the transmit power down to 20W or
> less, more then that will cause problems with other radios in the van,
> and get the antenna as far away from other antennas as possible,
> preferably on a 30' or more mast.
>
> -- 
> Jim Barbour
> WD8CHL
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>





 
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Re: [Repeater-Builder] Re: Speaker Level Mixing

[Q]

Joe Montierth wrote:

>--- Q <[EMAIL PROTECTED]> wrote:
>
>  
>
>>Memories...1959 Chrysler Saratoga Police special,426
>>Hemi,push button 
>>automatic w/mechanical overdrive lever.Motorola 
>>tube radio on 
>>37mhz,Speedo went to 160,certified. BIG gas
>>tank...lousy mileage! Engine 
>>still lives in buddys rail dragster...
>>
>>
>
>
>I thought the 426 Hemi wasn't built until 1963 or 64,
>maybe yours was a 392 hemi or a 426 wedge.
>
>Joe
>
>It was a 392,just seeing if you were paying attention...
>   
>
>  
>





 
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[Repeater-Builder] Sale items.

[safari_tim]

I don't recall seeing items listed for sale on this list.
 
Is that OK to do?
 
---Tim 













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Re: [Repeater-Builder] Motorola Flexars - Sell?

[Jim B.]

NØATH wrote:

> I have a friend that sent me the following e-mail: Are there any
> Motorola fans out there that can tell me what could be done with
> these? These rigs are in EXTREMELY good condition - Look New.( The
> repeaters ( I haven't seen the HT's )). I don't know if they have PL,
> DPL, any type of an ID or what in them. Are they of value at all? My
> friend is getting along in years and doesn't want to try and build
> anything from them.
> 
> 
> 
>> Dave / what could be done with 2 Motorola Flexar base repeaters on
>> 469.775 mhz DPL 3l5, probably about >10 maybe 25 watts, these were
>> used in a large metal warehouse for communications by the
>> maintenance >crew, the H/T's had 6 channels, 469.775;
>> 464.775;466.100; & simplex 461.100; 469.775; 466.100.the
>> >Motorola H/T's were HT600's. Do not have any manuals. Do have 2
>> small turnstyle antennas to go with the >repeaters.
> 
> 
> Can anybody help me with info on these? Are they useable on the
> amateur bands or worthwhile to try to convert? I think the talkies
> are probably all with drop in chargers and everything was being used
> when the warehouse went belly up. I wouldn't hazard a guess on the
> condition of the Ni-cads. Probably some good /some bad. They have all
> been off for a period of time.
> 
> Dave / NØATH

Yup-the Flexar repeaters will go down to the ham band OK, at least to 
444. I have one that, while it loses a few watts on transmit, does 
receive ok.
There are several caveats on them, though. They are crystal 
controlled-bascially two Maxars in a box-well, two boxes. (If there is 
only one box for each 'repeater', it's just a base station.) They use a 
mini-mobile duplexer, barely enough isolation for the package, and lots 
of loss. Typical sensitivity with the duplexer in line will be around 
.6-.7 uV. And because the duplxer is borderline, preamps are a BIG no-no.
Also absolute max tranmitter output through the duplexer will be 18W, 
and at that you really need a fan on it.
I also see that you mention it's DPL. You will need to pull the DPL 
boards, one in the tranmitter and one in the receiver, and substitute PL 
boards if you want other than digital squelch.
The HT600's will work just fine in the ham band as well. Hold the 
'shift' key down while you enter the freq's when programming. More info 
is on batlabs.com.

-- 
Jim Barbour
WD8CHL





 
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Re: [Repeater-Builder] Mobile Repeaters?

[Jim B.]

Dakota Summerhawk wrote:

> Is the best way to have a mobile repeater up and running with two mobile
> radios and a duplexer? Looking for a way to be able to run a couple of
> repeaters, one VHF, one UHF for a mobile communications van. Can anyone
> recommend ways to cut down on weight and space?
> Thanks
> Dakota
> 

Best way to cut space-forget about the VHF unit. For UHF, get a Kenwood 
TKR-850 and a mobile duplexer. Keep the transmit power down to 20W or 
less, more then that will cause problems with other radios in the van, 
and get the antenna as far away from other antennas as possible, 
preferably on a 30' or more mast.

-- 
Jim Barbour
WD8CHL





 
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Re: [Repeater-Builder] Mobile Repeaters?

[[EMAIL PROTECTED]]

radius gr400 repeater
or a set of maxtracs with a rick box and a duplexer
but remember to check wide band or narrowband


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RE: [Repeater-Builder] Re: Moving R100 to ham band?

[N9WYS]

Yes, Mike - they work quite
well, if tuned up properly.  I’m
currently running one as a back-up unit for my 444.550 machine.  

If you need the tune-up
pages from the manual, let me know.

 

Mark – N9WYS

 

 

-Original
Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
Sent: Sunday, January 02, 2005
11:53 PM
To:
Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re:
Moving R100 to ham band?

 

Mike, they move quite
easily, I tuned one down to 449.275 and it still had good sensitivity. All
I had to do is readjust the VCO voltages and retune the front end of the
receiver. You will have to interface the controller through the 25 pin remote connector.
(If it has one) I have a page from Zetron explaining where to get the
signals from if you need it. I also have scanned a manual (quite a lot of megs
if I remember right) that I'll offer if you have a high speed connection.

 

Art - KC7GF 


















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Re: [Repeater-Builder] Off topic part 95 DCS on GMRS

[Jim B.]

Barry Thompson wrote:

> Thanks to Russ, I contacted the FCC WTB regarding
> the usage of DCS/DPL or anything other than
> common tone names like PL from the Motorola trade
> mark and was confirmed that anything other than
> PL was not authorized under part 95.181 sub
> section "G & H".
> 
> In my local area I've had a gmrs repeater up for
> some "10" years with little to no co-channel
> problems on the same PL, as of late some
> dick-head decided to turn up my PL on his
> repeater and has ignored several request to turn
> it off. The same individual in Oakland, CA also
> has DPL turned on to his users, gee guess whois
> going to get a call from the WTB:) An Official
> complaint has been filed, I want to see big bucks
> come out of this violators pocket.
> 
> I highly recommend to everyone on this list
> server if your running DCS/DPL on your gmrs
> repeater you think twice as many of us old guys
> are going to get you busted with big fines:)
> 
> 
> 
> REgards, Barry

bullshit. AGAIN-THE LAST PLACE TO ASK QUESTIONS ABOUT RADIO LEGALITIES 
IS THE FCC!!! They WILL tell you it's not legal, regardless. The people 
who answer the phones are not qualified to make decisions about 
interpretations such as this, and can only 'CYA'.
THERE IS NO LAW AGAINST USING subaudible digital access methods on GMRS, 
including DCS/DPL/DCG, or LTR.
-- 
Jim Barbour
WD8CHL





 
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Re: [Repeater-Builder] Re: Speaker Level Mixing

[Joe Montierth]

--- Q <[EMAIL PROTECTED]> wrote:

> 
> Memories...1959 Chrysler Saratoga Police special,426
> Hemi,push button 
> automatic w/mechanical overdrive lever.Motorola 
> tube radio on 
> 37mhz,Speedo went to 160,certified. BIG gas
> tank...lousy mileage! Engine 
> still lives in buddys rail dragster...


I thought the 426 Hemi wasn't built until 1963 or 64,
maybe yours was a 392 hemi or a 426 wedge.

Joe



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Re: [Repeater-Builder] Re: Repeater Controllers

[Jim B.]

Q wrote:

> Mine uses all 16 digits,and I told it to do sowho still messes with 
> 12 digit pads??? This is the 21st century after all
> 
> Mark Holman wrote:
> 
> 
>>I know a Repeater that uses the ABCD commands in theirs  and one is speed 
>>dial to A A A auto service ? I think they still do !
>>Mark Holman  AB8RU

The original point was whether you HAVE to use the fourth column.
There was a point about using an NHRC controller on a 900 Mhz repeater, 
as there is no ham gear for that band, and none of the commercial gear 
has 16-button pads.

Jim Barbour
WD8CHL





 
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Re: [Repeater-Builder] Re: Speaker Level Mixing

[Neil McKie]

  I had one ex-police car (1961 Dodge Seneca) ... and an ex 
 California Highway Patrol car (1969 Dodge Polara, with the 
 440 Magnum engine in it; would pass anything but a gas station.) 
 
  I had fun with it too ... ;) 

  Neil - WA6KLA 


Mike Morris WA6ILQ wrote:
> 
> Neil - you're the one with several ex-highway-patrol
> cars in your history
> 
> The nearest I got to a public safety vehicle was the
> ex-DEA dodge dart undercover chase car.  It had
> the ex-Arizona highway patrol UHF micor in it...
> 
> By the way, Ed's chevy suburban will turn one
> million miles in another 19k or so miles
> 
> Mike WA6ILQ
> 
> At 08:17 PM 1/1/05, you wrote:
> 
> >   Mike, it looks like your car.
> >
> >   Neil
>





 
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[Repeater-Builder] Re: [Motorola] MSR2000 PA Transistors

[skipp025]

Do what most of us are doing, buy used Motorola 
radios of the same era/type and lift the transistors 
from surplus radios. 

I purchased 40 used mitrek 110 watt radios for 
replacement UHF MSR PA Modules. Although the 
remove and replace process takes some 3 plus 
hours of serious work, the much lower cost 
offsets the financial pain.

The same would apply with with the VHF pa, which 
also depends on whick of the 3 or 4 known VHF 
PA versions you have. 

Ebay and the surplus radio dealers are good part 
sources. 

cheers, 
skipp 
skipp025 at yahoo.com 
www.radiowrench.com/sonic 

> > Anyone know where I can find MSR2000 finals?  
> > I have a high band VHF MSR2000 with 2 blown 
> > finals (one set), and would like to replace 
> > all 4 if I can find a set of replacement transistors







 
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Re: [Repeater-Builder] Re: Repeater Controllers

[Q]

Jim B. wrote:

>
>The original point was whether you HAVE to use the fourth column.
>There was a point about using an NHRC controller on a 900 Mhz repeater, 
>as there is no ham gear for that band, and none of the commercial gear 
>has 16-button pads.
>
>Jim Barbour
>WD8CHL
>
>
>
>
>Yes,I understand that. It wouldnt take much to put a 16 digit DTMF mic or pad 
>on those radios if it was absolutely needed. My system has multiple 
>controllers and absolutely needs that 4th column. If you can get by with a 12 
>button,great! 73,Lee,N3APP
>  
>





 
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Re: [Repeater-Builder] Re: Speaker Level Mixing

[Q]

Memories...1959 Chrysler Saratoga Police special,426 Hemi,push button 
automatic w/mechanical overdrive lever.Motorola  tube radio on 
37mhz,Speedo went to 160,certified. BIG gas tank...lousy mileage! Engine 
still lives in buddys rail dragster...

Neil McKie wrote:
 I had one ex-police car (1961 Dodge Seneca) ... and an ex California 
Highway Patrol car (1969 Dodge Polara, with the 440 Magnum engine in it; 
would pass anything but a gas station.) I had fun with it too ... ;) 
Neil - WA6KLA

>
>Mike Morris WA6ILQ wrote:
>  
>
>>Neil - you're the one with several ex-highway-patrol
>>cars in your history
>>
>>The nearest I got to a public safety vehicle was the
>>ex-DEA dodge dart undercover chase car.  It had
>>the ex-Arizona highway patrol UHF micor in it...
>>
>>By the way, Ed's chevy suburban will turn one
>>million miles in another 19k or so miles
>>
>>Mike WA6ILQ
>>
>>
>>
>>
>  
>





 
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Re: [Repeater-Builder] Was Speaker Level Mixing,now OT

[Q]

I just retired my 1990 Chevy Astro (hamfest)Van at 297,000+ due to rust, 
the salt and chemicals takes its toll up here in snow country. Still 
runs new... Best mileage was my 1979 Malibu,retiring at 410,000. It now 
makes 1/4 mile runs at 11 seconds but with a tubular frame.Bowties rule!
73,Lee,N3APP,Erie,Pa

Neil McKie wrote:

>  My 1990 Chevy Suburban has 336,000+ miles on it now.  I visited 
> the transmission shop a few weeks ago and had the tranny replaced 
> as the guy said it was probably a bit tired. 
>
>  The engine is original having never been apart except for a timing 
> chain, front and rear seals and the harmonic balancer. 
>
>  Neil 
>
>JOHN MACKEY wrote:
>  
>
>>Christ!
>>
>>My truck has over 300,000 miles on it.  I can't imagine running a 
>>vehicle to a million.
>>
>>-- Original Message --
>>Received: Mon, 03 Jan 2005 12:00:21 AM CST
>>From: Mike Morris WA6ILQ <[EMAIL PROTECTED]>
>>SNIP
>>
>>
>>>By the way, Ed's chevy suburban will turn one
>>>million miles in another 19k or so miles
>>>  
>>>
>>
>>
>
>
>
>  
>





 
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[Fwd: Re: [Repeater-Builder] Moto CDM-750 question]

[James]

OOPS, Pin 2, not pin 3.




Should be 600 ohms at pin 3 (ext mic).  You can get around this by
turning up the mic gain in the programming software.

James

Rob & Chris wrote:

  
  
  
  Can anyone tell me what the input
impedance for the accessory Mic input is on a CDM-750 UHF or how much
drive it takes to get 3KHz deviation?  
  I am trying to hook one up to use
for an autopatch and cannot get enough drive from the patch to be
useful. I suspect an impedance mismatch.
  I don't have any doc for the things
and Moto's web site isn't any help.
  Thanks -Rob-
  
  
   
  
   
  
















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Re: [Repeater-Builder] Moto CDM-750 question

[James]

Should be 600 ohms at pin 3 (ext mic).  You can get around this by
turning up the mic gain in the programming software.

James

Rob & Chris wrote:

  
  
  
  Can anyone tell me what the input
impedance for the accessory Mic input is on a CDM-750 UHF or how much
drive it takes to get 3KHz deviation?  
  I am trying to hook one up to use
for an autopatch and cannot get enough drive from the patch to be
useful. I suspect an impedance mismatch.
  I don't have any doc for the things
and Moto's web site isn't any help.
  Thanks -Rob-
  
  
  
  
  
  
  
  
















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Re: [Repeater-Builder] Rusty Bolt effect and noise floor questions

[Matt]

Hi Joe and Scott,

Thanks for your replies.

Yes, I did the test as described in the article and like you Joe, I did one
more step which was to key the transmitter and check for desense. The SINAD
reading on the meter didn't change when I keyed up.

Its a "proper" commercial antenna the repeater group purchased and its only
been up since early November so I'm hoping its not my own antenna :-)

I do like the idea of taking an AM receiver to site and having a listen
around. I hadn't thought of that and will do this as soon as I can.

I wonder if oiling the dodgy connection causing this rusty bolt effect would
temporarily stop it, meaning I could identify the culprit?

Best wishes all and thanks for the replies.

Matt
G4RKY
- Original Message - 
From: "Joe" <[EMAIL PROTECTED]>
To: 
Sent: Monday, January 03, 2005 8:34 AM
Subject: Re: [Repeater-Builder] Rusty Bolt effect and noise floor questions



It's not desense that he has, it is loss of sensitivity.  If he did the
sensitivity test as stated on the article Chris wrote, the transmitter is
not active.
http://www.repeater-builder.com/tech-info/effectivesens.html
I take the test one step more and transmit during the sensitivity test to
look for desense.

73, Joe, k1ike

At 08:17 PM 1/2/2005, you wrote:
>Desense in the neighborhood of 17 db. is a definite
>possibility. The source of the desense can be inadequate attenuation of the
>transmitter and receiver frequencies by the appropriate sections of your
>duplexer or, and in fact, wideband noise produced within your antenna or
>other 'hardware" in it's vicinity due to poor connections and or corrosion
>when excited by your transmitter.

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Re: [Repeater-Builder] Re: Speaker Level Mixing

[Neil McKie]

  My 1990 Chevy Suburban has 336,000+ miles on it now.  I visited 
 the transmission shop a few weeks ago and had the tranny replaced 
 as the guy said it was probably a bit tired. 

  The engine is original having never been apart except for a timing 
 chain, front and rear seals and the harmonic balancer. 

  Neil 

JOHN MACKEY wrote:
> 
> Christ!
> 
> My truck has over 300,000 miles on it.  I can't imagine running a 
> vehicle to a million.
> 
> -- Original Message --
> Received: Mon, 03 Jan 2005 12:00:21 AM CST
> From: Mike Morris WA6ILQ <[EMAIL PROTECTED]>
> SNIP
> > By the way, Ed's chevy suburban will turn one
> > million miles in another 19k or so miles
> 
>





 
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Re: [Repeater-Builder] Re: Speaker Level Mixing

[Wade Lake]

 This sounds like a viable solution on the surface, however, it may be
more trouble than its worth.  Care would have to be taken to get it to sound
decent.  The speaker grill would have to be sealed properly.  Also, be
careful if you use Maxtrac speakers for anything but Maxtracs.  They were 2
Ohms if I remember correctly.  Not the ideal load for most amps, except for
Maxtracs of coarse ;-)  even if your audio amp can handle it, the audio
output would likely be harsh sounding and hard to control.

Wade - KR7K


>
>
> What about removing the 4" speaker from its enclosure and replacing it
> with two of the small oval speakers like the ones found like the ones
> found in the front of the Maxtracs ?
>
>
>
> --- In Repeater-Builder@yahoogroups.com, DCFluX <[EMAIL PROTECTED]> wrote:
> > Anyone had experience with mixing the speaker output of 2 radios, Say
> > Motorola GM300's to one speaker?
> >
>
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>





 
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[Repeater-Builder] Motorola Flexars - Sell?

[NØATH]

I have a friend that sent me the following e-mail: 
Are there any Motorola fans out there that can tell me what could be done with 
these? These rigs are in EXTREMELY good condition - Look New.( The 
repeaters ( I haven't seen the HT's )). I don't know if they have PL, DPL, any 
type of an ID or what in them. Are they of value at all? My friend is getting 
along in years and doesn't want to try and build anything from 
them.
 
 
>Dave / what could be done with 2 
Motorola Flexar base repeaters on 469.775 mhz DPL 3l5, probably about 
>10 maybe 25 watts, these were used in a large metal warehouse for 
communications by the maintenance >crew, the H/T's had 6 channels, 
469.775; 464.775;466.100; & simplex 461.100; 469.775; 
466.100.the >Motorola H/T's were HT600's. Do not have any manuals. 
Do have 2 small turnstyle antennas to go with the 
>repeaters.
 
Can anybody help me with info on these? Are they 
useable on the amateur bands or worthwhile to try to convert? I think the 
talkies are probably all with drop in chargers and everything was being used 
when the 
warehouse went belly up. I wouldn't hazard a guess 
on the condition of the Ni-cads. Probably some good /some bad. They have all 
been off for a period of time.
 
Dave / NØATH













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Re: [Repeater-Builder] Rusty Bolt effect and noise floor questions

[Joe]

It's not desense that he has, it is loss of sensitivity.  If he did the 
sensitivity test as stated on the article Chris wrote, the transmitter is 
not active.
http://www.repeater-builder.com/tech-info/effectivesens.html
I take the test one step more and transmit during the sensitivity test to 
look for desense.

73, Joe, k1ike

At 08:17 PM 1/2/2005, you wrote:
>Desense in the neighborhood of 17 db. is a definite
>possibility. The source of the desense can be inadequate attenuation of the
>transmitter and receiver frequencies by the appropriate sections of your
>duplexer or, and in fact, wideband noise produced within your antenna or
>other 'hardware" in it's vicinity due to poor connections and or corrosion
>when excited by your transmitter.

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RE: [Repeater-Builder] Question on emmision types

[KA9QJG]

 
This 
Might Help 
 
Good 
Luck Don KA9QJG/R 444.750 All Mot Micor 
 

  
  


  Bandwidth

  This is the required bandwidth of the transmitter.The 
above example represents "16.0kHz bandwidth".The decimal point is 
replaced with "H", "K", "M", or "G".These define as:

  H
  = Hertz

  K
  = Kilohertz

  M
  = Megahertz

  G
  = Gigahertz

   

  1st Digit

  A
  = AM (Amplitude Modulation), double-sideband

  B
  = AM, independent sidebands

  C
  = AM, vestigial sideband

  D
  = Amplitude and Angle Modulated carrier

  F
  = Angle Modulated, frequency modulation

  G
  = Angle Modulated, phase modulation

  H
  = AM, single-sideband, full carrier

  J
  = AM, single-sideband, suppressed carrier

  K
  = Pulse, amplitude modulation (PAM, PSM)

  L
  = Pulse, width modulation (PWM)

  M
  = Pulse, phase or position modulation (PPM)

  N
  = Emission of an unmodulated carrier

  P
  = Pulse, no modulation

  Q
  = Pulse, carrier also angle-modulated during pulse

  R
  = AM, single-sideband, reduced or variable level carrier

  W
  = Pulse, two or more modes used

  X
  = All cases not covered above

   

  2nd Digit

  0
  = No Modulation

  1
  = Digital, on-off or quantized, no modulation

  2
  = Digital, with modulation

  3
  = Single analog channel

  7
  = Two or more digital channels

  8
  = Two or more analog channels

  9
  = Composite, one or more digital channel, one or more analog

  X
  = All cases not covered above

   

  3rd Digit

  A
  = Aural telegraphy, for people (Morse code)

  B
  = Telegraphy for machine copy (RTTY, fast Morse)

  C
  = Analog fax

  D
  = Data, telemetry, telecommand

  E
  = Telephony, voice, sound broadcasting

  F
  = Video, television

  N
  = No Information

  W
  = Combinations of the above

  X
  = All cases not covered above













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Re: [Repeater-Builder] Re: Speaker Level Mixing

[Wade Lake]

I agree with Coy.


That's the trouble with most of these post, and all of them using
 transformers. You are still driving audio back into the other output
 stage. That will sooner or later distroy the audio output PA !!!
 I've replaced many expensive PA Moduls becaue someone pulled this
 number. The only way to do it right is to load each`output with a
 resistor, AC couple the audio (using caps on both sides of the
 outputs) into a mixer circuit and then amplify the whole thing.


Motorola used to make "public address" amplified speakers that would go loud
enough to make your ears to bleed for the Maxar and some of the other lower
end radios, the public safety guys often used these to get the audio output
of the better radios.  They also had some of those for the Public Address
add-on for the maxtrac.  I wonder if they are easily obtained these days?
They would be great for this application.

Wade - KR7K


- Original Message - 
From: "Coy Hilton" <[EMAIL PROTECTED]>
To: 
Sent: Saturday, January 01, 2005 12:08 AM
Subject: [Repeater-Builder] Re: Speaker Level Mixing


>
>
>
>
> --- In Repeater-Builder@yahoogroups.com, Gary Pearce KN4AQ
> <[EMAIL PROTECTED]> wrote:
> > At 01:48 PM 12/30/2004, you wrote:
> >
> > >Anyone had experience with mixing the speaker output of 2 radios,
> Say
> > >Motorola GM300's to one speaker?
> >
> > I did that and more in a Saturn - feeding the right side of a dual-
> band
> > radio plus a 220 radio and the car radio into the car's right
> speaker, and
> > the left side of the dual-band plus the car radio into the car's
> left
> > speaker.  It worked great.  I could use everything at once, and
> the
> > fidelity of the ham equipment through the car speakers was good.
> (I
> > actually used a 30 watt stereo amplifier to obtain enough audio
> from the
> > ham rigs to drive the car speakers through blocking resistors,
> complicating
> > the installation some.
> >
> > I've attached a j-peg of the schematic, if this list will accept
> > j-pegs.  The schematic doesn't have component values, I think the
> resistors
> > were 20 ohm, 10 watt, and the capacitors were 1000 uF, 50 volt.
> >
> > Basically I put a blocking resistor on each side of each speaker
> wire from
> > each "rig" (actually from the output of the stereo amp).  I put a
> capacitor
> > on each wire from the car speaker (4 total, 2 left and 2 right) to
> block
> > the DC that this audio system put on the speaker wires from
> getting to the
> > ham rigs.
>
> What did you use to block the AC..(Audio) from feeding back into the
> other radio?...
>
> That's the trouble with most of these post, and all of them using
> transformers. You are still driving audio back into the other output
> stage. That will sooner or later distroy the audio output PA !!!
> I've replaced many expensive PA Moduls becaue someone pulled this
> number. The only way to do it right is to load each`output with a
> resistor, AC couple the audio (using caps on both sides of the
> outputs) into a mixer circuit and then amplify the whole thing.
>
>
>
> >
> > There was a little interaction between the radios, with volume
> dropping
> > just a little when the "second" radio is turned on.  I found that
> > acceptable.  But an active mixer is certainly a more elegant way
> to go.
> >
> > 73,
> > Gary KN4AQ
> >
> >
> >
> >
> >
> >
> _
> _
> > Gary Pearce KN4AQeditor, SERA Repeater Journal
> > Cary, NC www.sera.org
> > 919-380-9944 [EMAIL PROTECTED]
> > [EMAIL PROTECTED]
> >  AOL/Yahoo Instant Messenger: KN4AQ Radio
> >  (send e-mail to be put on my "buddy list")
>
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>





 
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[Repeater-Builder] Question on emmision types

[J Q P]

Can any one please ID what these emission types 
are?
 
F1D,
 A1D, 
J1D, 
R1D, 
H1D, 
G1D,
 J3E, 
H3E, 
R3E, 
& G3E
 
Thanks













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Re: [Repeater-Builder] Re: Speaker Level Mixing

[JOHN MACKEY]

Christ!

My truck has over 300,000 miles on it.  I can't imagine running a vehicle
to a million.

-- Original Message --
Received: Mon, 03 Jan 2005 12:00:21 AM CST
From: Mike Morris WA6ILQ <[EMAIL PROTECTED]>
SNIP
> By the way, Ed's chevy suburban will turn one
> million miles in another 19k or so miles






 
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Re: [Repeater-Builder] Re: Speaker Level Mixing

[Mike Morris WA6ILQ]

Neil - you're the one with several ex-highway-patrol
cars in your history

The nearest I got to a public safety vehicle was the
ex-DEA dodge dart undercover chase car.  It had
the ex-Arizona highway patrol UHF micor in it...

By the way, Ed's chevy suburban will turn one
million miles in another 19k or so miles

Mike WA6ILQ

At 08:17 PM 1/1/05, you wrote:

>   Mike, it looks like your car.
>
>   Neil
>
>Joe Montierth wrote:
> >
> > --- Mike Morris WA6ILQ <[EMAIL PROTECTED]> wrote:
> >
> > >
> > > At 01:02 PM 12/31/04, you wrote:
> > >
> > > > Once upon a time you could buy 6 X 9 speakers
> > > with two voice coils, each
> > > >8 ohms or so. Haven't seen one for years, but they
> > > may still be out there
> > > >somewhere. Used to use one for just what you are
> > > wanting to do, run two rigs
> > > >into one speaker.
> > > >
> > > >73,
> > > >Al, K9SI
> > >
> > > Not just 6x9s, but several sizes.
> > >
> > > Remember, Google is your friend.
> > >
> > > I plugged the string ["dual voice coil" OR "dual
> > > coil" speaker]
> > > into google and got over 26,000 hits.  Here's the
> > > jewels from
> > > the first thirty:
> > >
> > >
> > 
> > >
> > > Here's a source of 6x9, 4x10 and 5x7 inch speakers
> > > at a decent price:
> > >
> > 
> > >
> > > This web page lists prices on the DVC speakers:
> > > 
> > >
> > > Here's a 6.5" round one, but it's high priced
> > >
> > 
> > >
> > > I also found a 10" one but who needs a speaker that
> > > large in a vehicle?
> > > (unless you're trying to rattle license plates two
> > > lanes away)
> > >
> > > Mike WA6ILQ
> > >
> >
> > Here's a link to proper placement on a "public safety"
> > style vehicle:
> >
> > 
> http://www.discount-airline-cheap-tickets.com/Blues-Brothers-Car-Picture.jpg
> >
> > Joe





 
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[Repeater-Builder] Re: Moving R100 to ham band?

[kc7gf]

Mike, they move quite easily, I tuned one down to 449.275 and it still had good sensitivity. All I had to do is readjust the VCO voltages and retune the front end of the receiver. You will have to interface the controller through the 25 pin remote connector. (If it has one) I have a page from Zetron explaining where to get the signals from if you need it. I also have scanned a manual (quite a lot of megs if I remember right) that I'll offer if you have a high speed connection.
 
Art - KC7GF













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Re: [Repeater-Builder] Portable Repeater - A Case History

[Eric Lemmon]

Kevin,

Yes, it is asymmetrical.  Each of the three high-pass resonators has two
black plastic plugs near the connector end, while the low-pass
resonators each have one plastic plug.  A Celwave engineer told me that
the 5085-1 is manufactured to order, and that the coupling loops are
factory-adjusted through these ports for optimum return loss at a
particular split, and for a certain band segment.  As a result, the
5085-1 is not really tunable over the entire high VHF band.  I don't see
that as a negative, since it was ordered specifically for this portable
repeater application and is not likely to require retuning.

73, Eric Lemmon WB6FLY

Kevin Custer wrote:
> 
> Eric Lemmon wrote:
> 
> >It comprises six helical resonators in a notch-only configuration.  Its 
> >insertion loss at RX is 1.1 dB, and at TX is 1.4 dB.  The notch depth at RX 
> >is 92.5 dB and at TX is 79.4 dB.  These are very good numbers, better than 
> >what is needed for
> >zero desense in this application, and are roughly equivalent to four 8 inch 
> >standard cavities at a 600 kHz split.
> >
> 
> Is it asymmetrical in design or what is the reason for the differing
> numbers between the two sides?  At least the notch of the transmitter
> side-band noise is the big number.
> 
> Kevin




 
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[Repeater-Builder] Re: Moving R100 to ham band?

[Gary]

--- In Repeater-Builder@yahoogroups.com, "n1ist" <[EMAIL PROTECTED]> wrote:
> 
> The repeater fairies just dropped off a Moto R100, model Q2932A on
> 462.8624/468.8625 with a code of 051.  It has options L168ANSP,
> L658AASP, and L143AGSP.  How hard is it to move this to 447.175?  I
> have the RSS from the Russian site and the notes from Batlabs; I 
will
> build the programming cable tomorrow.  Do I need to retune the RF 
side
> also?  Where do I interface a controller?  I need to set this up to
> fill in for our main repeater until I can get to the site and 
figure
> out why it is off the air.  Thanks.
> 
> /mike
> [EMAIL PROTECTED]

Mike,

1) Though I have never interfaced a controller to one, here is a 
link to CSI's TP-154 repeater tone panel hookup chart for the R100. 
This should also work for a basic repeater controller.

http://www.connectsystems.com/public_html/hookups/bulletin3a.htm

2) You say you read the Batlab's info on the R100, you know that you
are going to hack the software MDF file to make it work in the ham 
band? Make sure you have (or save) a copy of the original program 
before you start messing with the file in a hex editer. Then, hack
the copy. Mistakes do happen.

3) The R100 software is extremely picky about computer speed. This 
RSS was made back in the 286 processor days. It is ancient software 
and it works like its' age. But, it does work! No Windows, or 
Windows Dos emulaters. Use Dos 6.22!

4) Yes, you will have to retune both receiver and the transmitter. 
As far as you are moving it in frequency, the vco's will probably 
not lock. Even if they did, it would not perform well. I hope the 
repeater fairy also left a service manual for the R100. It is not 
hard to tune one with the proper equipment, but there is a proper 
procedure that needs to be followed that is in the service manual.

5) I'm not sure if you are aware, or if it's even an issue. The R100 
only came in DPL or PL, not both. If you need PL and your repeater 
is DPL, you will have to disable DPL in the software and use an 
external tone source such as a Com Spec or equiv.

Good luck,

Gary








 
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Re: [Repeater-Builder] Moto CDM-750 question

[Eric Lemmon]

Rob,

The input impedance of either the front panel mike input, or the
external mike input on Pin 2 of the Accessory Connector, is 560 ohms. 
Both inputs are factory-set at 14mV for 3kHz deviation, but the gains
can be adjusted in CPS.

The above information was found in Paragraph 2.3.2 of the CDM Detailed
Service Manual, 6881091C63.

> Rob & Chris wrote:
> 
> Can anyone tell me what the input impedance for the accessory Mic input is on 
> a CDM-750 UHF or how much drive it takes to get 3kHz deviation?  I am trying 
> to hook one up to use for an autopatch and cannot get enough drive from the 
> patch to be useful. I suspect an impedance mismatch.  I don't have any doc 
> for the things and Moto's web site isn't any help.

Thanks -Rob-




 
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[Repeater-Builder] Re: Moto CDM-750 question

[Rob]

--- In Repeater-Builder@yahoogroups.com, Eric Lemmon <[EMAIL PROTECTED]> 
wrote:
> Rob,
> 
> The input impedance of either the front panel mike input, or the
> external mike input on Pin 2 of the Accessory Connector, is 560 
ohms. 
> Both inputs are factory-set at 14mV for 3kHz deviation, but the 
gains
> can be adjusted in CPS.
> 
> The above information was found in Paragraph 2.3.2 of the CDM 
Detailed
> Service Manual, 6881091C63.
> 

Thanks Eric. I'll check with the local radio shop and see if they can 
adjust it for me. I don't want to start modding the patch unit at 
this stage, but if necessary can do so down the road.
Thanks again -Rob-







 
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[Repeater-Builder] Moving R100 to ham band?

[n1ist]

The repeater fairies just dropped off a Moto R100, model Q2932A on
462.8624/468.8625 with a code of 051.  It has options L168ANSP,
L658AASP, and L143AGSP.  How hard is it to move this to 447.175?  I
have the RSS from the Russian site and the notes from Batlabs; I will
build the programming cable tomorrow.  Do I need to retune the RF side
also?  Where do I interface a controller?  I need to set this up to
fill in for our main repeater until I can get to the site and figure
out why it is off the air.  Thanks.

/mike
[EMAIL PROTECTED]








 
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[Repeater-Builder] smx4450 maxon

[ian wells]

i am chaseing information on keeping a smx4450 
repeater cool .i have considered installing a bigger heatsink onto the back of 
the tx radio  but i also remember that someone sugested installing a 
antenna tuner between the tx radio and the diplexer to reduce the swr so the tx 
module runs cooler.can anyone sugest a tunner for this band 470-480mhz 
.
Thank youIan WellsKerinvale 
Comaudiomail service 1017,Biloela,4715.www.kerinvalecomaudio.com.au
 













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Re: [Repeater-Builder] Possible Motorola duplexer?

[Mathew Quaife]

As far as the SP, I think that might be something just for them, mine has a
SP1 after the model number.  I can't say for sure about a busy site, my
repeater was in town next to several VHF transmitters and one other UHF
transmitter, as well as a Railroad radio system, and about a 1000 feet from
a Microwave tower for the local phone company, never had any problems with
it and interference.  I just remember when we had it open that the tuning
coils were somewhat on the fragile side.  If need be I could get a hold of
the gentlemen that tuned mine, see if he remembers it, kind of hard to say,
that was back in 1988 that we built this repeater.

Mathew

- Original Message -
From: "Eric Lemmon" <[EMAIL PROTECTED]>
To: 
Sent: Sunday, January 02, 2005 10:22 AM
Subject: Re: [Repeater-Builder] Possible Motorola duplexer?


>
> Joe,
>
> It's a small world!  I have exactly the same Motorola duplexer, that
> came mounted on the back of a 100 watt MICOR MSY repeater previously
> used by Union Oil Company.  My unit is marked TFE6080A SP300, and was
> tuned to 451.675/456.675 MHz.
>
> This unit comprises six helical resonators in a notch-only
> configuration, and is known as a "Compact Base Station Duplexer."  A
> friend of mine who is a Motorola technician tried to get information on
> this unit from the factory, but found nothing.  Although it is more
> rugged and has a deeper notch than the typical mobile notch duplexer, it
> has practically no bandpass action and is therefore not suitable for use
> at a congested site unless additional bandpass cavities are employed.
>
> The SP300 marking on my unit suggests that it was not a standard
> production item, and may account for the lack of available information
> on it.  The photo in the link you provided seems to show a faint "SP"
> after the model number... true?
>
> 73, Eric Lemmon WB6FLY
>
> Joe wrote:
> >
> I found this UHF BP/BR duplexer in back of some stuff while I was
> cleaning the shack:
> > http://users.adelphia.net/~k1ike/UHFbpbr1.JPG
> > Anyone have an ID on this one?  It is marked TFE6080A and is mounted on
a 19" rack plate.
> >
> > 73, Joe, K1ike
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>





 
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Re: [Repeater-Builder] Re: [Motorola] MSR2000 PA Transistors

[Eric Lemmon]

Mitch,

RF Parts does list the M9625 on their Web site.  Dunno how much $...  Go
here:



73, Eric Lemmon WB6FLY

kd4htw2001 wrote:
> 
> --- In Repeater-Builder@yahoogroups.com, Eric Lemmon <[EMAIL PROTECTED]>
> wrote:> Ken,>
> The M1134 PA transistors, AKA 4884411L34, are identical to the M9625,
> which are AKA 480089625.  These are no longer available from
> Motorola. However, the M1134 can be replaced by the 2N6097 or the
> ECG356.
> 
> I do not think you will find them anymore... I need them for the
> Forestry Repeaters in South Carolina.  I've tried to find a 2N6097 or
> an NTE356 on line they are obsolete if they are available they
> are probably 3 digits in price!
> 
> If you find a good source let me know and I will use the lite blue
> plastic card and buy some for the shelf
> 
> Old working Micor's mobile is a good source for the transistor.
> 
> Mitch KD4HTW
> 
> >
> > Ken Cechura wrote:
> > >
> > Anyone know where I can find MSR2000 finals?  I have a high band VHF
> > MSR2000 with 2 blown finals (one set), and would like to replace
> all 4 if I can find a set of replacement transistors
> 
> 
> Yahoo! Groups Links
> 
> 
> 
>




 
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Re: [Repeater-Builder] Possible Motorola duplexer?

[Joe]

Mine has "SP1" stenciled on it.  It shows a pass and notch frequency for 
each side in the 456/451Mhz range, so I assumed it was a BP/BR 
duplexer.  The label calls it a "Diplexer", but the inputs are marked ANT, 
RX and TX.

Joe

At 01:22 PM 1/2/2005, you wrote:
>The SP300 marking on my unit suggests that it was not a standard
>production item, and may account for the lack of available information
>on it.  The photo in the link you provided seems to show a faint "SP"
>after the model number... true?

All outgoing email scanned with Norton AntiVirus2004.






 
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Re: [Repeater-Builder] Rusty Bolt effect and noise floor questions

[Scott]

Hello Matt--

Sounds like you may be desensing yourselfWhat happens to the signal to
noise ratio of a received weak signal when you turn off your repeater
transmitter? The signal to noise of the output of your repeater receiver
should stay the same and if it does all is well as far as desense is
concerned. If the noise drops, you have desense and the amount is indicated
by the drop in noise. Desense in the neighborhood of 17 db. is a definite
possibility. The source of the desense can be inadequate attenuation of the
transmitter and receiver frequencies by the appropriate sections of your
duplexer or, and in fact, wideband noise produced within your antenna or
other 'hardware" in it's vicinity due to poor connections and or corrosion
when excited by your transmitter. Remember that your duplexer is wide open
to receive frequency noise and that noise of this frequency may well be
produced within your antenna as a result of your transmitter excitation.
This is one reason that good commercial antennas are usually welded or at
least soldered together no clamped or bolted connections to invite
corroded connections.

Good luck!

Scott, N6NXI

- Original Message - 
From: "Matt" <[EMAIL PROTECTED]>
To: 
Sent: Sunday, January 02, 2005 2:57 PM
Subject: [Repeater-Builder] Rusty Bolt effect and noise floor questions


>
> Hi All,
>
> A very Happy New Year to you all on the R-B list!
>
> I have a couple of questions which I was wondering if anyone else out
there
> had any experience with.
>
> I run a 50MHz repeater in Somerset SW England,  but it is troubled by two
> things..
>
> First, I'm using a shared commercial mast and so antenna space is limited.
> The repeater uses a single dipole antenna and a WB5WPA type Heliax
duplexer.
>
> I carried out the procedure described by Kevin on the RB web site to asses
> the effective sensitivity of the repeater and was amazed at the results!
The
> effective sensitivity at my site is around -100dBm! So although my Rx is
> good for -117dBm for 12dB SINAD  the mobiles have a hard time getting in,
> although they can hear the repeater's  22W output fine.
>
> With a weak signal, all sorts of "birdies" can be heard in the background
> instead of a nice smooth white noise that you'd expect from a weak signal.
>
> So my first question is has anyone any experience or thoughts on using a
> device like the MFJ-1026 noise canceller or any other tricks to improve
the
> receive situation? Or is this just "how it is" on 50MHz?
>
> Secondly, when the wind blows, which it frequently does on this exposed
> site, I am affected by the good ol' rusty bolt effect (or duplexer hash)
> which I am aware of the causes / reasons for but wondered if anyone had
any
> experience of tracing this kind of problem to find the offending "bolt"
> whatever it turns out to be! There's a load of disused antennas on the
mast
> and some with their cut off feeder tails flapping so that was where I was
> going to start first but it would be great to be able to positively
identify
> the offending item somehow.
>
> Thanks in advance for any replies.
>
> Best wishes to all,
>
> Matt
> G4RKY.
>
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>






 
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[Repeater-Builder] Moto CDM-750 question

[Rob & Chris]

Can anyone tell me what the input impedance for the 
accessory Mic input is on a CDM-750 UHF or how much drive it takes to get 3KHz 
deviation?  
I am trying to hook one up to use for an autopatch 
and cannot get enough drive from the patch to be useful. I suspect an impedance 
mismatch.
I don't have any doc for the things and Moto's web 
site isn't any help.
Thanks -Rob-













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Re: [Repeater-Builder] Bickering - Thompson, McElhaney

[Frederick E. Fitte]

Bravo Kevin...


- Original Message - 
From: "Kevin Custer" <[EMAIL PROTECTED]>
To: 
Sent: Saturday, January 01, 2005 2:45 PM
Subject: Re: [Repeater-Builder] Bickering - Thompson, McElhaney


> 
> Barry Thompson wrote:
> 
> >Joe, your more visiable than you think.
> >
> >My info is public and has been since joining this
> >forum.
> >
> >I actually liked your response, your just another
> >"LID" in my book.
> >
> >Let the games begin.
> >
> >Regards, Barry
> >
> 
> Mr. Thompson,  Mr. McElhaney,
> There will be NO games played on this list.  If you two want to fight 
> about some penny-anny BS, go somewhere else.
> I will not hesitate to throw anyone off this list for persistent name 
> calling, finger pointing, or any other childish bullshit.
> Get over it.  Move on.
> 
> Kevin Custer
> 
> 
> 
> 
> 
>  
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 
> 




 
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[Repeater-Builder] Re: [Motorola] MSR2000 PA Transistors

[kd4htw2001]

--- In Repeater-Builder@yahoogroups.com, Eric Lemmon <[EMAIL PROTECTED]> 
wrote:> Ken,> 
The M1134 PA transistors, AKA 4884411L34, are identical to the M9625,
which are AKA 480086925.  These are no longer available from 
Motorola. However, the M1134 can be replaced by the 2N6097 or the 
ECG356.


I do not think you will find them anymore... I ned them for the 
Forestry Repeaters in South Carolina.  I've tried to find a 2N6097 or 
an NTE356 on line they are obsolete if they are available they 
are probably 3 digits in price! 

If you find a good source let me know and I will use the lite blue 
plastic card and buy some for the shelf  

Old working Micor's mobile is a good source for the transistor.

Mitch KD4HTW

> 
> Ken Cechura wrote:
> > 
> Anyone know where I can find MSR2000 finals?  I have a high band VHF
> MSR2000 with 2 blown finals (one set), and would like to replace 
all 4 if I can find a set of replacement transistors







 
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Re: [Repeater-Builder] Rusty Bolt effect and noise floor questions

[Joe]

I have a repeater here in Connecticut on 53.41Mhz and occasionally have 
noise problems.  I did the receiver noise test on my repeater several years 
ago and was amazed at the amount of sensitivity is lost due to ambient 
noise on 6 meters!  I don't remember the numbers, but do remember it was 
substantial.

The last noise I tracked down was a streetlight that was stuck in the 
"start" mode about 1/4 mile from the repeater.  I called the local power 
company and reported a bad streetlight starter, along with the town, 
street, and pole number.  A couple days later my wife called and said the 
power company was in front of our house working on the power lines. (I'm 
about 10 miles from the repeater, different town).  They changed the 
insulators up and down the street from my house with "RFI" type 
insulators.  These are all nonconducting, even the hardware.  I called them 
back, thanked them for what they did, and informed them that they were 10 
miles and 2 towns off!  My house is very RFI quiet now.  Through their 
wonderful computerized service department, they used caller ID to locate 
the trouble and never listened to the report.  That's progress.

Anyway, they fixed the streetlight and things have been quiet since.  All I 
get now is a tick sound every few seconds.  This is the tower strobe 
firing.  I figure this is a good thing because I can keep track of the 
tower light night operation quite easy from my house.  That's the least I 
can do as a good tenant.

Cold, dry, windy days can raise havoc.  The static noise can get quite 
bad.  6 meters is generally a noise bad compared to other repeater 
frequencies.  It helps to occasionally bring a scanner to the site that 
receives AM mode.  You will be surprised at what you might hear on AM that 
only amounts to reduced FM reception with no clue of a problem.  Lots of 
time, you can listen to the noise on AM an identify it, especially TV and 
CATV signals.

73, Joe, k1ike

At 05:57 PM 1/2/2005, you wrote:
>So my first question is has anyone any experience or thoughts on using a
>device like the MFJ-1026 noise canceller or any other tricks to improve the
>receive situation? Or is this just "how it is" on 50MHz?

All outgoing email scanned with Norton AntiVirus2004.






 
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