[Repeater-Builder] Help with Duplexer ID

[Don]

I need Help to Id a set of 4 Can Duplexers I Got from a Friend I hope
they are for 220. They are not marked Except The harness 4 Cables with
N Connectors are 8-9 in long They have WACO Written on them, On Top of
each Can by the Connecter is Engraved MB. 

The Size is 10 ½ In High and 22 ¼ in around I know Wacom Made
the
WP-652 And the WP-653 this is not them also all Black in Color 

Any Help with the ID will be greatly appreciated 

Thanks Don KA9QJG 







 
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Re: [Repeater-Builder] motorola trisolector

[Neil McKie]

  A Motorola TLDxxx model number says it is a 150 MHz range unit.  
 If your plan is to use it on the 2 meter ham band, I don't believe 
 it will tune sharply enough to do you any good. 

  It was originally designed use was probably either 5.26 or 6.28 MHz 
 spread between transmit and receive.  That just won't work on the 2 
 meter amateur band. 

  Neil - WA6KLA 


Paul wrote:
> 
> hello everyone ,
> I have a motorola trisolector part number tld-8994b.
> a friend once told me that this could be used as a duplexer ,in fact
> it is a duplexer from a mobile radio telephone does any one have
> information about it ? i was told it is a vhf unit and it is rated
> for 40-45 watts that is about all i know
> it also has a number on it 15e83122f-05 this is stamped in the
> casing .
> any info you fellas could give would be appreciated
> Paul (n9fco)
>





 
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Re: [Repeater-Builder] Antenna mounting brackets

[NØATH]

Al - Do you need the antenna clamps - If that is 
what you are looking for I believe I have a set of those - I am probably to far 
from you to build stand offs for you - shipping would probably be cost 
prohibitive. Dave / NØATH

  - Original Message - 
  From: 
  Al Wolfe 
  
  To: Repeater-Builder@yahoogroups.com 
  
  Sent: Wednesday, March 09, 2005 8:12 
  PM
  Subject: [Repeater-Builder] Antenna 
  mounting brackets
  
      Anyone got any ideas on where 
  to find standoff mounting brackets for a DB224? Also interested in where to 
  find stiff-arm hardware, etc. I have just welded up something in the past but 
  this will be at 400 feet, side mounted. Needs to be commercial 
  quality.
   
  73,
  Al, 
  K9SI













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Re: [Repeater-Builder] Daniels Electronics Manuals

[Tony Faiola]

Hello Rob:

I have the SM-3 System Monitor Manual.  It covers Models: SM-3, SM-3B 
also replaces SM-2.  I also have the UT-2C (UHF Transmitter) plus some 
other of their manuals.

Best you go off list to see if you have interest in these manuals.

Ciao, Tony

Rob Hoeye wrote:
> 
> I'm looking for manuals for the Daniels Electronics AC-3, AC-2, VT-
> 2, VR-2, UR-2, UT-2, SM-3B, SM-2 and any others I can find. Daniels 
> says that these are past the ten year support period and are no 
> longer supported.  They don't even keep manuals that they will sell 
> to the public.
> 
> Can any one point me at a source for these manuals.
> 
> Thanks
> Rob
> 
> 
> 
> 
> 
> 
> 
>  
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 
> 
> 






 
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[Repeater-Builder] Re: motorola trisolector

[nj902]

--- In Repeater-Builder@yahoogroups.com, "Paul" <[EMAIL PROTECTED]> wrote:
"...I have a motorola trisolector part number tld-8994b. a friend once
told me that this could be used as a duplexer ,in fact it is a
duplexer from a mobile radio telephone does any one have any
information about it ?"
__

It is a duplexer of sorts.  It is from the first generation Motorola
VHF Pulsar car telephone [the one that resembles a Mocom 70]

The trioselector serves several purposes including receiver front end
selectivity, transmitter harmonic filtering and duplexing both to a
common antenna.  Here are the specs:

Duplex spacing: 4.5 MHz minimum
Rcvr Atten at Ft: 70 dB minimum
Rcvr insertion loss: 5 dB max
Xmtr insertion loss: 2 dB max
Xmtr VSWR: 1.2:1 max








 
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Re: [Repeater-Builder] portable/mobile GMRS repeater antenna

[russ]

I guess I should have said we use a Kenwood TKR-850 (non ver. 2)for the
repeater running 25 watts and for a duplexer we use an old mobile duplexer
model 631 made by Celwave. It does work very well. Set up time takes very
little time.
73 Russ,

- Original Message - 
From: "russ" <[EMAIL PROTECTED]>
To: 
Sent: Thursday, March 10, 2005 1:58 PM
Subject: Re: [Repeater-Builder] portable/mobile GMRS repeater antenna


>
>
> On my port-a-peater for GMRS I use a DB-404
> and a short mast that I plug in a mount that I plug into my trailer hitch
on
> my SUV. it works very well for Bike tours and walks that our group does.
>
> - Original Message - 
> From: "rtoplus" <[EMAIL PROTECTED]>
> To: 
> Sent: Thursday, March 10, 2005 10:52 AM
> Subject: [Repeater-Builder] portable/mobile GMRS repeater antenna
>
>
> >
> >
> > Question
> >
> > I'm assembling a portable/emergency GMRS repeater for my vehicle.
> > Said repeater will run about 10-15 watts or so out of the duplexer
> > (notch style).  I'm trying to decide on an antenna to use.  I want
> > to go with a mag mount for portability reasons.  Would you fine
> > folks recommend a 1/4 wave antenna or a gain flavor.  Just wondering
> > which one would duplex better or do you suppose there would be any
> > difference at all?
> >
> >
> > Thanks!
> > Bob, GMRS WPVV845, Amateur KG4WAD, LMRS WPXC892
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
>
>
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>








 
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Re: [Repeater-Builder] Duplexer Retuning TXRX 28-37-02A Help

[Gary Hoff]

If the Service monitor has a tracking generator in addition to the spectrum
analyzer, look on the repeater builder web site for an article on tuning the
Wacom Duplexer, think it was a 641, and it shows you how to hook it up and
everything.  Same philosophy applies regardless of the type of duplexer.
Gary - K7NEY

- Original Message - 
From: "w9mwq" <[EMAIL PROTECTED]>
To: 
Sent: Thursday, March 10, 2005 3:54 PM
Subject: [Repeater-Builder] Duplexer Retuning TXRX 28-37-02A Help


>
>
> Due to the recoordination of my repeater, I'm looking for that Elmer
> to help me along the way retuning this set of duplexer's.  I have
> the tuning instructions and have a Cushman CE-6030 service monitor
> with an analyzer, but not sure just what to do.  I have everything
> it talks about in the instructions with the exception of a RLB-150
> Bridge, and I believe this may be the same thing I built called an
> iso-tee, might be incorrect.
>
> But if someone is willing to help me with this endeaver, it would be
> greatly appreciated, as the funds are short in supply to send them
> back to get done by the factory.  There is a total of six cans.  And
> if I read it right, each one has to be tunned independently, then
> put all together and tuned together.
>
> I've order the new crystals which will be here next weekend, so that
> is when I will begin this project to get the system back up on the
> air.
>
> Thanks
>
> Mathew
>
>
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
> 





 
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[Repeater-Builder] Daniels Electronics Manuals

[Rob Hoeye]

I'm looking for manuals for the Daniels Electronics AC-3, AC-2, VT-
2, VR-2, UR-2, UT-2, SM-3B, SM-2 and any others I can find. Daniels 
says that these are past the ten year support period and are no 
longer supported.  They don't even keep manuals that they will sell 
to the public.

Can any one point me at a source for these manuals.

Thanks
Rob







 
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[Repeater-Builder] Duplexer Retuning TXRX 28-37-02A Help

[w9mwq]

Due to the recoordination of my repeater, I'm looking for that Elmer 
to help me along the way retuning this set of duplexer's.  I have 
the tuning instructions and have a Cushman CE-6030 service monitor 
with an analyzer, but not sure just what to do.  I have everything 
it talks about in the instructions with the exception of a RLB-150 
Bridge, and I believe this may be the same thing I built called an 
iso-tee, might be incorrect. 

But if someone is willing to help me with this endeaver, it would be 
greatly appreciated, as the funds are short in supply to send them 
back to get done by the factory.  There is a total of six cans.  And 
if I read it right, each one has to be tunned independently, then 
put all together and tuned together.

I've order the new crystals which will be here next weekend, so that 
is when I will begin this project to get the system back up on the 
air.

Thanks

Mathew








 
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Re: [Repeater-Builder] Micor in cabinet mobile conversion desense.

[Kevin Custer]

skipp025 wrote:

>Sometimes there is no free Commercial radio lunch... a standard converted 
>Micor Mobile will start in chassis desense at power levels above 30-40 watts. 
>

I have converted about 100 Motorola Micor Mobiles to repeaters.  They 
have included types from Low Band, High Band, and UHF, and RailRoad 
versions.
I have *never* seen an in cabinet desense issue, even with a 6 meter 
unit at 500 Kc separation, or a 2M unit with 600 Kc separation, either 
one running 110 watts, or more.  Some Micor Low Band mobiles will easily 
do 150 watts.  While I won't run a mobile at those levels continuously, 
I have thoroughly tested them and have never seen one ounce of desense.

In the units you have experienced these problems, have they been 
properly converted?  Double shielded RX cabling?  What band?  Have the 
Audio & Squelch Boards had the duplex RF bypassing done?  Where do you 
believe the desense to have been ingressing, at an RF level, or audio?  
Realize that the Micor Mobile AF amplifier will exhibit desense issues.  
I have traced these issues back to the large filter capacitor on the 
interconnect board; which has dried out.  Also, even when the AF amp is 
experiencing difficulty, the audio from the Emitter Follower is clean, 
and since this is where I choose to get the audio that is to be 
repeated, no ill effects are ever seen in real practice.  So, are you 
sure the desense you heard was being retransmitted, or was it simply 
disturbing the local speaker?

Brian Martens of ICS Controllers will be releasing a custom controller 
for the Motorola Micor Mobile repeater conversion (if he hasn't 
already).  At my recommendation, he has included an on-board AF amp that 
allows the OEM Micor AF PA to be removed, resulting in less current 
draw, and it gets around the Micor's audio amplifier's shortcomings when 
a mobile radio is used as a repeater.

>I'm sure the converted high powered mitreks also suffer from the same problem.
>

I have experienced desense in *some* of the 2M conversions I have done 
on the Mitrek.

Kevin Custer





 
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[Repeater-Builder] motorola trisolector

[Paul]

hello everyone ,
I have a motorola trisolector part number tld-8994b.
a friend once told me that this could be used as a duplexer ,in fact 
it is a duplexer from a mobile radio telephone does any one have 
information about it ? i was told it is a vhf unit and it is rated 
for 40-45 watts that is about all i know 
it also has a number on it 15e83122f-05 this is stamped in the 
casing .
any info you fellas could give would be appreciated
Paul (n9fco)











 
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Re: [Repeater-Builder] portable/mobile GMRS repeater antenna

[russ]

On my port-a-peater for GMRS I use a DB-404
and a short mast that I plug in a mount that I plug into my trailer hitch on
my SUV. it works very well for Bike tours and walks that our group does.

- Original Message - 
From: "rtoplus" <[EMAIL PROTECTED]>
To: 
Sent: Thursday, March 10, 2005 10:52 AM
Subject: [Repeater-Builder] portable/mobile GMRS repeater antenna


>
>
> Question
>
> I'm assembling a portable/emergency GMRS repeater for my vehicle.
> Said repeater will run about 10-15 watts or so out of the duplexer
> (notch style).  I'm trying to decide on an antenna to use.  I want
> to go with a mag mount for portability reasons.  Would you fine
> folks recommend a 1/4 wave antenna or a gain flavor.  Just wondering
> which one would duplex better or do you suppose there would be any
> difference at all?
>
>
> Thanks!
> Bob, GMRS WPVV845, Amateur KG4WAD, LMRS WPXC892
>
>
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>








 
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Re: [Repeater-Builder] Re: Hamtronics, Inc.--Looking for Recommendation or info

[russ]

Hello All,
I do not know that much about the Hamtronics repeaters I did but 3 of them a
year or so a go for 900 MHz Ham use but replaced them very quickly with
Kenwood 900 MHz repeater. But the short time they where up they worked very
well. The only problem I had was we did replace the PL or sub tone
Hamtronics encode decode units with CommSpec units. Now we just keep them
around as back up repeaters in case the Kenwoods should go down.
73 Russ, W3CH.

- Original Message - 
From: "Q" <[EMAIL PROTECTED]>
To: 
Sent: Thursday, March 10, 2005 12:49 PM
Subject: Re: [Repeater-Builder] Re: Hamtronics, Inc.--Looking for
Recommendation or info


>
>
> While I agree to a certain extent,having one on the 220 band for 22 years,
> they didnt play well in the 2 meter band with all the rf flying around
> and were
>  replaced with MastrII's which have been flawless for a quarter century
and
> with superior performance and better audio,squelch,tone decoding,and on
> and on...
> I wouldnt even consider any Hamtronics stuff for a commercial site-ever!
> You can learn a lot by doing your own conversion,probably more than
> by building their kit. And the docs are superior too! 73,Lee,N3APP
>
> skipp025 wrote:
>
> >By the nature of the beast, if one buys and builds
> >a Hamtronics repeater from kits, you will learn
> >quite a bit, while trading time and money vs buying
> >a premade unit.
> >
> >There is something to be said for the mechanical
> >build of the converted commercial radio, but a well
> >done kit project can also be well made.
> >
> >It would be hard to compare the electronic operation
> >of the two without using specific radio/kit models.
> >
> >I have love hate relationships with both kits and
> >commercial conversions.
> >
> >Hamtronics stuff is fun to make and works pretty well,
> >I've got some late 70's early 80's Hamtronics gear
> >still in regular operation.  Good old diode matrix
> >ID Board, the COR-2, autopatch-1 on six meter strips
> >chugging along since late 1980 without fail.
> >
> >Back then, you mostly bought and built kits, now you
> >can buy things pre-made if you don't have the time.
> >
> >cheers,
> >skipp
> >
> >ps: Yep, that was/is me in the old Hamtronics Paper
> >and now Online Catalog with the long time positive
> >user feedback. Darn 24 plus year old kits won't die...
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>








 
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Re: [Repeater-Builder] Isolator retuning question

[Neil McKie]

  Well, I got this large 19" rack panel: came with a Bird RF Low 
 Pass Filter #5041 labeled 50 MHz cut off. 

  Also included is a Microwave Associates three port isolator ... 
 with Model 7N053B, 43.56 MHz on the label.  The 50 ohm load is 
 missing - the reason I was able to buy it for about $0.50 at a 
 swapmeet??? 

  The whole assembly is labeled Microwave Associates Model HL-17-6, 
 Serial 83, 43.56 MHz 

  The isolator is 5" x 5" x 3" 

  Neil - WA6KLA 


Bob Dengler wrote:
> 
> At 3/10/2005 11:21 AM, you wrote:
> 
> >   Has anyone ever tried to retune a low-band (43 MHz) Isolator 
> >  to the 6 meter band?
> >
> >   Neil - WA6KLA
> 
> Where would one even find such a beast today?  EMR's only go down 
> to 66 MHz now.
> 
> Bob NO6B
>





 
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Re: [Repeater-Builder] Isolator retuning question

[Bob Dengler]

At 3/10/2005 11:21 AM, you wrote:


>   Has anyone ever tried to retune a low-band (43 MHz) Isolator to
>  the 6 meter band?
>
>   Neil - WA6KLA

Where would one even find such a beast today?  EMR's only go down to 66 MHz 
now.

Bob NO6B






 
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[Repeater-Builder] IFR 1200A Operating Manual

[Jim Cicirello]

Hi Guys:
Can someone point me in the direction of where I might find a copy of 
the operating manual for the IFR 1200A Service Monitor? I have 
searched with no hits on the A model.
Thanks in advance.JIM  KA2AJH   







 
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Re: [Repeater-Builder] Re: Looking for Recommendation or info

[Neil McKie]

  Yup.  I bought it at a swapmeet a few years ago for $0.50 ... then 
 since, a couple more for a dollar or so. 

  The only problem I've had with it was the 1.5 volt 'D' cell went 
 dead one time. 

  Yea toobs ... 

  Neil - WA6KLA 


skipp025 wrote:
> 
> Yeah, but your VTVM is worth a lot more with the
> vintage audio/test crowd because it has "toobs"
> inside.
> 
> All that former dumster stuff is again worth big
> loot with the retro tube audio crowd.
> 
> cheers Neil,
> 
> skipp
> 
> >  Neil McKie <[EMAIL PROTECTED]> wrote:
> >   Like my Heath-kit VTVM.
> >
> >   Neil - WA6KLA
> >
>





 
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[Repeater-Builder] Re: Looking for Recommendation or info

[skipp025]

Yeah, but your VTVM is worth a lot more with the 
vintage audio/test crowd because it has "toobs" 
inside. 

All that former dumster stuff is again worth big 
loot with the retro tube audio crowd. 

cheers Neil,

skipp 

>  Neil McKie <[EMAIL PROTECTED]> wrote:
>   Like my Heath-kit VTVM. 
> 
>   Neil - WA6KLA 
> 







 
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Re: [Repeater-Builder] Re: Hamtronics, Inc.

[N9LLO]

In a message dated 3/10/05 2:51:02 PM US Eastern Standard Time, [EMAIL PROTECTED] writes:
There's no reason you can't run a Hamtronics repeater at a commercial> site when all the homework is done properly. Their turnkey boxes are> even FCC Type-Accepted.> > cheers, skipp> >   Not for part 90. If I ever see one of those at a site, I will find outwhose it is and raise hell. Especially if me or my customer is havinginterference problems.-- Jim BarbourWD8CHL
They have been part 90 accepted for quite some time now.
 
Chris
N9LLO













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Re: [Repeater-Builder] Re: Hamtronics, Inc.

[Jim B.]

skipp025 wrote:

> 
> Hi Lee,
> 
> You get what you pay for... I found the bare kit type receiver front
> end needed a bit more help for a high rf level repeater site. I
> bought the extra helical preamp front end and it works just fine. 
> Also depends on the era and type of kit receiver. Some have minimal
> amounts of helical front ends, some are pretty robust with 5 to 8
> helical cavities in the front end.

Thing is, for the same amount of money, you can either put together a
Motorola or GE station conversion, or just go out and buy a Kenwood
TKR-850. In either case, you will have a more reliable package, and a
MUCH cleaner transmitter, especially cleaner, properly limited audio
that won't splatter on to adjacent channels.
This has been a problem with all made-for-amateur repeaters except for
the Icom's. They just can't seem to make clean transmitters.

> 
> There is no free lunch,
> 
> Back in my early days ("wooden repeaters") I installed a kit built
> repeater at a broadcast site, before I got down the hill the repeater
> locked up in transmit. I traced the problem back to the basic cor kit
> circuit without any extra rf bypass cosiderations... not enjoying the
> nearby FM Broadcast Transmitter. Logic & isolation diodes make good
> rf rectifiers...
> 
> A hand full of 220pf disc caps in all the right places and we were
> once again working well. The advantage of a commercial radio would be
> the added extra rf bypass and shielding.  Sometimes there is no free
> Commercial radio lunch... a standard converted Micor Mobile will
> start in chassis desense at power levels above 30-40 watts. I'm sure
> the converted high powered mitreks also suffer from the same problem.
> 

If you are getting in-cabinet desense from a Micor mobile at any power
level, there is something VERY wrong. I've seen them function just fine
at full output, 100W+. (Not left at that power of course, but desense
isn't an issue.)

> 
> Kits and conversions are a great way to learn about the equipment,
> else you buy plug-&-play and start playing with the controller right
> away.
> 
> There's no reason you can't run a Hamtronics repeater at a commercial
> site when all the homework is done properly. Their turnkey boxes are
> even FCC Type-Accepted.
> 
> cheers, skipp
> 
> 

  Not for part 90. If I ever see one of those at a site, I will find out
whose it is and raise hell. Especially if me or my customer is having
interference problems.

-- 
Jim Barbour
WD8CHL

>> Q <[EMAIL PROTECTED]> wrote: While I agree to a certain extent,having
>> one on the 220 band for 22 years, they didnt play well in the 2
>> meter band with all the rf flying around and were replaced with
>> MastrII's which have been flawless for a quarter century and with
>> superior performance and better audio,squelch,tone decoding,and on
>>  and on... I wouldnt even consider any Hamtronics stuff for a 
>> commercial site-ever! You can learn a lot by doing your own
>> conversion, probably more than by building their kit. And the docs
>> are superior too! 73,Lee,N3APP





 
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Re: [Repeater-Builder] Isolator retuning question

[Neil McKie]

  Has anyone ever tried to retune a low-band (43 MHz) Isolator to 
 the 6 meter band?  

  Neil - WA6KLA 

Bob Dengler wrote:
> 
> At 3/9/2005 10:43 PM, you wrote:
> 
> >Tom,
> >
> >If you have been following this thread for a while, you probably have
> >picked up on the fact that the typical isolator cannot be tuned more
> >than 1 or 2 MHz away from the original factory tuning.
> 
> This is incorrect.  See
> 
> http://www.repeater-builder.com/sinclair/isolator-tuning-instructions.pdf





 
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Re: [Repeater-Builder] Re: Hamtronics, Inc.--Looking for Recommendation or info

[Neil McKie]

  Like my Heath-kit VTVM. 

  Neil - WA6KLA 


skipp025 wrote:
> 
> By the nature of the beast, if one buys and builds
> a Hamtronics repeater from kits, you will learn
> quite a bit, while trading time and money vs buying
> a premade unit.
> 
> There is something to be said for the mechanical
> build of the converted commercial radio, but a well
> done kit project can also be well made.
> 
> It would be hard to compare the electronic operation
> of the two without using specific radio/kit models.
> 
> I have love hate relationships with both kits and
> commercial conversions.
> 
> Hamtronics stuff is fun to make and works pretty well,
> I've got some late 70's early 80's Hamtronics gear
> still in regular operation.  Good old diode matrix
> ID Board, the COR-2, autopatch-1 on six meter strips
> chugging along since late 1980 without fail.
> 
> Back then, you mostly bought and built kits, now you
> can buy things pre-made if you don't have the time.
> 
> cheers,
> skipp
> 
> ps: Yep, that was/is me in the old Hamtronics Paper
> and now Online Catalog with the long time positive
> user feedback. Darn 24 plus year old kits won't die...
> 
> 
> Yahoo! Groups Links
> 
> 
> 
>





 
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[Repeater-Builder] Re: Isolator retuning question

[skipp025]

> Bob Dengler <[EMAIL PROTECTED]> wrote:

> > It takes more than a spectrum analyzer to properly 
> > tune a circulator or isolator.
> 
> Yes, need a tracking gen. to go with the spectrum 
> analyzer.  Personally I use a TX, wattmeter & 2nd 
> isolator (already tuned to freq. of course, to 
> keep the TX looking like 50 ohms while tuning the 
> isolator under test).
> 

The tracking generator is used as a review tool. Some 
circu/isolators drift quite a bit with applied power. 
Best to tune it up near the expected temp and operating 
power as you get it into the ball part. Service monitor 
cold (low signal) tuning only gets you in the area. 

Multiple loads, watt meters and a service monitor 
are the big players. Tune it once at lower power, 
then tune it again at full power. There will be a 
difference.  

skipp 







 
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[Repeater-Builder] Re: Hamtronics, Inc.

[skipp025]

Hi Lee, 

You get what you pay for... I found the bare kit 
type receiver front end needed a bit more help for 
a high rf level repeater site. I bought the extra 
helical preamp front end and it works just fine. 
Also depends on the era and type of kit receiver. 
Some have minimal amounts of helical front ends, 
some are pretty robust with 5 to 8 helical cavities 
in the front end. 

There is no free lunch, 

Back in my early days ("wooden repeaters") I installed 
a kit built repeater at a broadcast site, before I 
got down the hill the repeater locked up in transmit. 
I traced the problem back to the basic cor kit circuit 
without any extra rf bypass cosiderations... not 
enjoying the nearby FM Broadcast Transmitter. 
Logic & isolation diodes make good rf rectifiers... 

A hand full of 220pf disc caps in all the right 
places and we were once again working well. The 
advantage of a commercial radio would be the added 
extra rf bypass and shielding.  Sometimes there 
is no free Commercial radio lunch... a standard 
converted Micor Mobile will start in chassis desense 
at power levels above 30-40 watts. I'm sure the 
converted high powered mitreks also suffer from 
the same problem. 

Kits and conversions are a great way to learn 
about the equipment, else you buy plug-&-play 
and start playing with the controller right away. 

There's no reason you can't run a Hamtronics 
repeater at a commercial site when all the 
homework is done properly. Their turnkey boxes 
are even FCC Type-Accepted. 

cheers,
skipp 

> Q <[EMAIL PROTECTED]> wrote:
> While I agree to a certain extent,having one on the 
> 220 band for 22 years, they didnt play well in the 
> 2 meter band with all the rf flying around and were
> replaced with MastrII's which have been flawless 
> for a quarter century and with superior performance 
> and better audio,squelch,tone decoding,and on 
> and on...
> I wouldnt even consider any Hamtronics stuff for a 
> commercial site-ever! You can learn a lot by doing 
> your own conversion, probably more than
> by building their kit. And the docs are superior too! 
> 73,Lee,N3APP
> 
> skipp025 wrote:
> 







 
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Re: [Repeater-Builder] Isolator retuning question

[Bob Dengler]

At 3/9/2005 10:43 PM, you wrote:

>Tom,
>
>If you have been following this thread for a while, you probably have
>picked up on the fact that the typical isolator cannot be tuned more
>than 1 or 2 MHz away from the original factory tuning.

This is incorrect.  See

http://www.repeater-builder.com/sinclair/isolator-tuning-instructions.pdf

According to Sinclair, the minimum tunable bandwidth for a VHF isolator is 
2-4 MHz.  In addition, the tuning instructions state "larger bandwidth 
retunings are possible, but are more difficult".  I've personally retuned 
several isolators made for the 150-154 MHz range with no problems.

But the original post talks about a UHF isolator.  Certainly those can be 
tuned at least +/- 3% of their original design frequency.  At least every 
one I have can.  460 to 442 MHz is a bit further: it may or may not make 
it.  However, if there are no accessible tuning adjustments on it then it 
may be a fixed-tuned unit.  Some of these are broadband.  Just test it & 
see how it does at 442 MHz - you may get lucky.  If not, it probably can't 
be made to work there, at least not economically.

>   It takes more
>than a spectrum analyzer to properly tune a circulator or isolator.

Yes, need a tracking gen. to go with the spectrum analyzer.  Personally I 
use a TX, wattmeter & 2nd isolator (already tuned to freq. of course, to 
keep the TX looking like 50 ohms while tuning the isolator under test).

>Moreover, the typical isolator/circulator must be remanufactured in
>order to work properly on a frequency that is more than 2 or 3 MHz away
>from the original frequency.

See above.


>Although the best action is to return the isolator to the factory for
>rework, some firms, such as EMR and Telewave, have the expertise and
>wherewithal to remanufacture isolators made by others.  Judging from the
>postings on this subject, I think that some readers may believe that an
>isolator may be retuned to the 2m band from the 160 MHz band simply by
>tweaking a few variable capacitors.  Not true!

I'll agree with that.

Bob NO6B






 
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Re: [Repeater-Builder] Re: Hamtronics, Inc.--Looking for Recommendation or info

[Q]

While I agree to a certain extent,having one on the 220 band for 22 years,
they didnt play well in the 2 meter band with all the rf flying around 
and were
 replaced with MastrII's which have been flawless for a quarter century and
with superior performance and better audio,squelch,tone decoding,and on 
and on...
I wouldnt even consider any Hamtronics stuff for a commercial site-ever!
You can learn a lot by doing your own conversion,probably more than
by building their kit. And the docs are superior too! 73,Lee,N3APP

skipp025 wrote:

>By the nature of the beast, if one buys and builds 
>a Hamtronics repeater from kits, you will learn 
>quite a bit, while trading time and money vs buying 
>a premade unit. 
>
>There is something to be said for the mechanical 
>build of the converted commercial radio, but a well 
>done kit project can also be well made. 
>
>It would be hard to compare the electronic operation 
>of the two without using specific radio/kit models. 
>
>I have love hate relationships with both kits and 
>commercial conversions. 
>
>Hamtronics stuff is fun to make and works pretty well, 
>I've got some late 70's early 80's Hamtronics gear 
>still in regular operation.  Good old diode matrix 
>ID Board, the COR-2, autopatch-1 on six meter strips
>chugging along since late 1980 without fail. 
>
>Back then, you mostly bought and built kits, now you 
>can buy things pre-made if you don't have the time. 
>
>cheers, 
>skipp 
>
>ps: Yep, that was/is me in the old Hamtronics Paper 
>and now Online Catalog with the long time positive 
>user feedback. Darn 24 plus year old kits won't die... 
>
>
>
>
>
>
>
> 
>
>  
>





 
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[Repeater-Builder] Re: Hamtronics, Inc.--Looking for Recommendation or info

[skipp025]

By the nature of the beast, if one buys and builds 
a Hamtronics repeater from kits, you will learn 
quite a bit, while trading time and money vs buying 
a premade unit. 

There is something to be said for the mechanical 
build of the converted commercial radio, but a well 
done kit project can also be well made. 

It would be hard to compare the electronic operation 
of the two without using specific radio/kit models. 

I have love hate relationships with both kits and 
commercial conversions. 

Hamtronics stuff is fun to make and works pretty well, 
I've got some late 70's early 80's Hamtronics gear 
still in regular operation.  Good old diode matrix 
ID Board, the COR-2, autopatch-1 on six meter strips
chugging along since late 1980 without fail. 

Back then, you mostly bought and built kits, now you 
can buy things pre-made if you don't have the time. 

cheers, 
skipp 

ps: Yep, that was/is me in the old Hamtronics Paper 
and now Online Catalog with the long time positive 
user feedback. Darn 24 plus year old kits won't die... 







 
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[Repeater-Builder] Re: Isolator retuning question

[skipp025]

In addition to the below, tuning changes pretty fast 
with heat rise (applied rf) and proximity to other 
metals. 

skipp 

> Eric Lemmon <[EMAIL PROTECTED]> wrote:
> Tom,
> 
> If you have been following this thread for a while, you probably have
> picked up on the fact that the typical isolator cannot be tuned more
> than 1 or 2 MHz away from the original factory tuning.  It takes more
> than a spectrum analyzer to properly tune a circulator or isolator.
> Moreover, the typical isolator/circulator must be remanufactured in
> order to work properly on a frequency that is more than 2 or 3 MHz away
> from the original frequency.
> 
> Although the best action is to return the isolator to the factory for
> rework, some firms, such as EMR and Telewave, have the expertise and
> wherewithal to remanufacture isolators made by others.  Judging from the
> postings on this subject, I think that some readers may believe that an
> isolator may be retuned to the 2m band from the 160 MHz band simply by
> tweaking a few variable capacitors.  Not true!  Several internal
> components may need to be replaced, reground, or remachined in order to
> fit the precise parameters needed by a new operating frequency.
> 
> 73, Eric Lemmon WB6FLY
> 
> Thomas Oliver wrote:
> 
> >   After losing a PA I am wanting to put  an isolator in line before
> > installing the new amp and was needing some information about an
> > isolator I have, it is a Microwave Associates model # J-2101multi
> > stage isolator origionaly on 460 Mhz.  Does anyone know if it can be
> > retuned down to 442 Mhz? or any othe specifications of this beast?  I
> > have tried to remove the outer cover and it seems to be held with
> > something other than the 4 cover screws. tom n8ies
> >







 
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[Repeater-Builder] Re: Decibel uhf Antenna model number quiz

[skipp025]

Looks like it is the DB-411-B model I have.  

I've sent out a few copies of my drawing already 
with the DB-402-B file ID. If you're unable to 
modify the file ID (name) without hosing the 
file, email me direct again for a properly labeled 
DB-411-B.pdf file.  

Thanks for your feedback on the decibel antenna 
quiz. 

skipp 

skipp025 at yahoo.com 


> "T.J." <[EMAIL PROTECTED]> wrote:
> I have to agree with Tom that it is a DB 411.  I'm looking at
something like that for my machine here.
>  
> T.J. KC8LTS
> 
> Thomas Oliver <[EMAIL PROTECTED]> wrote:
> 
> I have a 11 year old Cartwright catalog that has a DB-411 that looks
just
> like what you are describing 4 loops all on same side of mast.
> 
> tom n8ies
> 
> 
> > [Original Message]
> > From: Q 
> > To: 
> > Date: 3/9/2005 5:07:56 PM
> > Subject: Re: [Repeater-Builder] Decibel uhf Antenna model number quiz
> >
> >
> > Sounds like a DB-404 to me...
> >
> > skipp025 wrote:
> >
> > >I've got an older Decibel UHF Antenna I'm 
> > >trying to figure out the model number. 
> > >
> > >Looks like a db-408 in mast length (about an 
> > >8 or 9 foot mast length), but only one dipole 
> > >per position for a total of 4 dipoles. Each 
> > >position of the db-408 has two dipoles on 
> > >each side of the mast. The actual antenna I 
> > >have has all the dipole in line, so the 
> > >pattern would be directional. 
> > >
> > >Somewhere in the legacy of Decibel Antenna 
> > >construction, they modified the dipole mounts 
> > >from the 4 inch long 1 inch diameter tube to 
> > >the current strap or bent bar mount. I'd be 
> > >curious if anyone knows the approximate date 
> > >of this change? 
> > >
> > >Anyone know the values of the VB-8 and VB-83 
> > >coax used in the harness? 
> > >
> > >Any ideas on the model number of this older 
> > >Decibel Antenna? 
> > >
> > >Once I get what I think is the proper label, 
> > >pdf scans of my measurements for this antenna 
> > >are available free (by email). 
> > >
> > >your turn
> > >thanks
> > >
> > >skipp 
> > >skipp025 at yahoo.com 
> > >www.radiowrench.com/sonic 
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > 
> > >Yahoo! Groups Links
> > >
> > >
> > >
> > > 
> > >
> > >
> > >
> > >
> > > 
> > >
> >
> >
> >
> >
> >
> > 
> > Yahoo! Groups Links
> >
> >
> >
> > 
> >
> >
> 
> 
> 
> 
> 
> 
> 
> 
> Yahoo! Groups Links







 
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[Repeater-Builder] Re: Antenna mounting brackets

[skipp025]

I bought the setup from Talley... didn't like the 
price so I had a local machine shop make up 10 extra 
copies for my site.  Cost about 75% of the Talley 
price after the machine & galvanizing shops were 
done with me. 

Talley or Tessco sell them... 

skipp 


> "Al Wolfe" <[EMAIL PROTECTED]> wrote:
> Anyone got any ideas on where to find standoff mounting brackets
for a DB224? Also interested in where to find stiff-arm hardware, etc.
I have just welded up something in the past but this will be at 400
feet, side mounted. Needs to be commercial quality.
> 
> 73,
> Al, K9SI







 
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[Repeater-Builder] Re: isolator / circulator needed

[skipp025]

Think you sold them all to me a year or two back 
Doug. Or some guy with a similar Ebay ID sold them 
to me... been that long... 

Email me direct if you need one, I'll pass 
it back to you for cost (If I can remember what I 
paid for them), just let me know.  I've got UHF 
and (mostly) VHF circuilators rated at 300 watts. 
I'll sell them out to serious project hams. Email 
me off the list if you need something. 

skipp025 at yahoo.com 

www.radiowrench.com/sonic 


> doug <[EMAIL PROTECTED]> wrote:
> 
> i need one of those monster 300+ watt capable 
> circulators from (i think) rockwell.
> 
> these are fairly broad-banded (last one i saw 
> was 140-155) and requires NO  TUNING.
> 
> i can't seem to find the one i had and i have 
> a 350w MSF station i just put on 2m that i 
> really need this for.  i'm not so concerned 
> with intermod as much as  i am saving the PA 
> should anything go amiss not that the MSF 
> will key anyway with problems!
> HELP!
> 
> 
> 
> doug







 
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[Repeater-Builder] portable/mobile GMRS repeater antenna

[rtoplus]

Question

I'm assembling a portable/emergency GMRS repeater for my vehicle.  
Said repeater will run about 10-15 watts or so out of the duplexer 
(notch style).  I'm trying to decide on an antenna to use.  I want 
to go with a mag mount for portability reasons.  Would you fine 
folks recommend a 1/4 wave antenna or a gain flavor.  Just wondering 
which one would duplex better or do you suppose there would be any 
difference at all?


Thanks!
Bob, GMRS WPVV845, Amateur KG4WAD, LMRS WPXC892








 
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[Repeater-Builder] Re: GE Mastr II UHF PA deck needed

[motarolla_doctor]

Looks like a KT-36A TX/PA  RT65FBS88HA combo








 
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[Repeater-Builder] Re: GE Mastr II UHF PA deck needed

[motarolla_doctor]

Mike, I think you may be in luck there are a couple of them in the 
SGVUSAR storrage. I can get numbers if needed.

Will

--- In Repeater-Builder@yahoogroups.com, Mike Morris WA6ILQ 
<[EMAIL PROTECTED]> wrote:
> The Pasadena City College ARC (W6BAB) GE Mastr II
> repeater lost it's PA deck due to a lightning strike.
> 
> All that is salvageable is the sheet metal and heat sink.
> 
> It's been running on a converted Mastr-Exec PA for a
> few years, but that died a couple of months ago.
> 
> Looking for a 40w, 60w or 100w PA.
> Target frequency is in the 445.200 area.
> 
> Let me know what you have, and how much $$ you
> are asking
> 
> Photos of the carbonized remains at:
> 
> 
> 
> 
> Mike WA6ILQ







 
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