Re: [Repeater-Builder] Re: Bomar Crystals Ordered, Figured it out

[Mathew Quaife]

That is what these radio's are.  They came from Canada.
   
  Mathew
  

"Jim B." <[EMAIL PROTECTED]> wrote:
  Mathew Quaife wrote:
> This is what
> makes me believe that the uhf receiver that I have will not handle
> the high side cut.

Actually, I have my doubts about a 450-470 split rx making it down to 
434 without some serious work. I know a Micor won't do it.
You should use a 403-430 split rx instead.
-- 
Jim Barbour
WD8CHL



 

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Re: [Repeater-Builder] Re: Bomar Crystals Ordered, Figured it out

[Mathew Quaife]

The radios that I have were from Canada, and was originally on 413  Mhz.  So 
chances are they will not hit the high side, but then also found that the xtal 
was cut wrong.
   
  Mathew
  

[EMAIL PROTECTED] wrote:
  At 1/2/2007 13:07, you wrote:
>Mathew Quaife wrote:
> > This is what
> > makes me believe that the uhf receiver that I have will not handle
> > the high side cut.
>
>Actually, I have my doubts about a 450-470 split rx making it down to
>434 without some serious work. I know a Micor won't do it.
>You should use a 403-430 split rx instead.

No such thing AFAIK, certainly in regards to G.E. RXs (standard bands are 
406-420 & (rare) 420-450). 434 is right in the middle between the low end 
of 450-470 & 406-420, so probably makes no difference which split you try 
to bring up or down. Since 88s are much more common, I'd go with 
that. Using high-side LO will allow the LO chain to easily reach 434 with 
little if any mods. For optimum RX you will need to modify the front-end 
helicals. I put a 450-470 Mastr II RX on 422 with no mods at all. It does 
work & everything tunes up but the sensitivity is about 6 dB off of where 
it should be, probably due to the front-end helicals being lossier since 
they're not optimized for that band.

Bob NO6B



 

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Re: [Repeater-Builder] Re: Bomar Crystals Ordered, Figured it out

[Mathew Quaife]

That is what these radio's are.  They came from Canada.
   
  Mathew
  

"Jim B." <[EMAIL PROTECTED]> wrote:
  Mathew Quaife wrote:
> This is what
> makes me believe that the uhf receiver that I have will not handle
> the high side cut.

Actually, I have my doubts about a 450-470 split rx making it down to 
434 without some serious work. I know a Micor won't do it.
You should use a 403-430 split rx instead.
-- 
Jim Barbour
WD8CHL



 

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[Repeater-Builder] Kdk mobile

[dgrapach]

I just aquiried a KDK 4033 220 mobile with the mic needing wired up to 
the plug, I understand that it is the same as the 2033 2m , not 
shure.I looked inside the radio thinking that I could trace the 
wires , but it looks to risky just to take a chance at it. I Googled 
it with no success . Does anyone know where or have the mic wiring id 
pinout?

Thanks for any help.

Denny
Ka3sxq

RE: [Repeater-Builder] Re: dB-224

[JamesMNelson]

If this is really the case, I am interested in this information also.

 

 

 

 

james//

 

-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Tom Manning
Sent: Monday, January 01, 2007 12:42 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Re: dB-224

 

Skipp025

If you have sufficient time I would appreciate a scan of the DB-224
antennas.  Of particular interest is the 220Mhz version as it seems you
could take a discard 150 version and modify it to use on 220.  Thanks de Tom
Manning, AF4UG [EMAIL PROTECTED]  net

- Original Message - 

From: skipp025   

To: Repeater-Builder@ 
yahoogroups.com 

Sent: Monday, January 01, 2007 10:45 AM

Subject: [Repeater-Builder] Re: dB-224

 

I've got to lay off that darn "Single Malt"... You are right! But 
I did make the drawings for the 224 and it would not be a big deal 
to rescan them if I had a senior moment and thought I did the scans 
with the rest of the db antennas. Or it could just be missing from 
the web page group and in my files collection at work. 

All those wanting the db-224 scans please send me an email direct 
and I'll get them out to you Tuesday or Wednesday. If I hit the 
California Lotto.. might be delayed as I have a one in 53-million 
chance of being that special person. That is... if I buy a ticket... 

skipp 
skipp025 at yahoo.com 

> "Paul Holm" <[EMAIL PROTECTED]> wrote:
> Skipp,
> 
> I don't see the dB-224 referenced on your page. Am I just missing it?
> 
> 73 Paul
> 
> 
> - Original Message - 
> From: "skipp025" 
> Sent: Sunday, December 31, 2006 7:42 PM
> Subject: [Repeater-Builder] Re: dB-224
> 
> 
> www.radiowrench.com/sonic
> s.
> 
> "rosewater42103"  wrote:
> >
> > i need to sort out some junk. Does anyone have the element &
phasing 
> > harness dimensions for the different band splits of the dB-224. I 
> > found the 138-150 split on repeater-builder. However I didn't
find the 
> > others.
> > 
> > Thanks
> > Fred N4GER
>

 

Re: [Repeater-Builder] Mini Audio Amplifier time...

[Scott Zimmerman]

Be sure to add a DC blocking capacitor to the input leads. The factory input 
runs right into the top of the pot. If you try to monitor any audio paths that 
have a DC bias on them, it will fry the volume pot. :(  I would suggest at 
least a 4.7uF preferred non-polar.

I have one that I use on my bench that the 1/8" jacks have been removed so that 
red and black test leads may exit the unit. I do agree with skip that it is 
just the handiest darn thing!!

Another "option" that I added was a small LED for a "power" indicator. I 
realize that it probably pulls about as much, if not more current than the rest 
of the circuit, but at least it's easier to remember when I've left it on.

Scott

Scott Zimmerman 
Amateur Radio Call N3XCC
474 Barnett Road
Boswell, PA 15531
  - Original Message - 
  From: skipp025 
  To: Repeater-Builder@yahoogroups.com 
  Sent: Tuesday, January 02, 2007 4:20 PM
  Subject: [Repeater-Builder] Mini Audio Amplifier time...


  Mini Audio Amplifier time... 

  It would be some of the best money spent on handy test gear if 
  many of you picked up a Radio Shack Mini Audio Amplifier. 

  Part Number: 277-1008

  http://www.radioshack.com/product/index.jsp?productId=2062620&cp

  Runs $12.99 and based on the time it will save you... well 
  worth the buck'ola's you'll spend. 

  You can use this handy beast for service, repairs and in the 
  case of the last emph & de-emph thread/posts to actually hear the 
  audio at various stages in your repeater system. 

  Runs on 9 volts so it's easily portable. The two side mounted 
  jacks allow you to use it for audio or even a line driver 
  application. In the current solar repeater thread you wouldn't 
  in even need to have the original equipment audio hardware 
  installed. Just bring along the mini amp for testing... 

  You can also remove the amplifier pc-board from the plastic 
  case and install it in various project locations... temp or 
  perm. 

  I'm sure more than one of you have run into one of these 
  amplifiers applied into a circuit temp and it was never 
  removed or changed. 

  When I speak to some of you on the phone about testing audio 
  I always try to convey how handy this "little bugger" can be. 

  Makes for easier trouble-shooting and if you're crafty enough 
  to make an rf probe, it will detect and amplify various rf 
  circuits/stages. Some of you might also harken back to the 
  original Radio Shack "Signal Tracer", which is pretty much an 
  equivalent function/device. 

  If you don't have one... it might be the best $12.99 you've 
  spent this month. Be sure to get the 9v battery and a 1/8 
  inch phono plug along with some shielded wire. Or buy the 1/8 
  inch on both ends jumper (from the shack) and cut it in half. 

  cheers,
  s. 

  > "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote:
  > Repeater audio amplifier stage to greatly reduce the standby 
  > current, with a switch to re-enable the audio PA for maintenance 
  > while at the site.



   


--


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  Checked by AVG Free Edition.
  Version: 7.5.432 / Virus Database: 268.16.2/613 - Release Date: 1/1/2007 2:50 
PM

Re: [Repeater-Builder] Re: Bomar Crystals Ordered, Figured it out

[no6b]

At 1/2/2007 13:07, you wrote:
>Mathew Quaife wrote:
> > This is what
> > makes me believe that the uhf receiver that I have will not handle
> > the high side cut.
>
>Actually, I have my doubts about a 450-470 split rx making it down to
>434 without some serious work. I know a Micor won't do it.
>You should use a 403-430 split rx instead.

No such thing AFAIK, certainly in regards to G.E. RXs (standard bands are 
406-420 & (rare) 420-450).  434 is right in the middle between the low end 
of 450-470 & 406-420, so probably makes no difference which split you try 
to bring up or down.  Since 88s are much more common, I'd go with 
that.  Using high-side LO will allow the LO chain to easily reach 434 with 
little if any mods.  For optimum RX you will need to modify the front-end 
helicals.  I put a 450-470 Mastr II RX on 422 with no mods at all.  It does 
work & everything tunes up but the sensitivity is about 6 dB off of where 
it should be, probably due to the front-end helicals being lossier since 
they're not optimized for that band.

Bob NO6B

Re: [Repeater-Builder] Re: Bomar Crystals Ordered, Figured it out

[no6b]

At 1/1/2007 19:25, you wrote:
>My first attempt, since I had the vhf/uhf radio on the bench already, I 
>put the xtal in the 144.810 rx side of the radio, it did not work, I would 
>have thought it should have at least received, even though I would have to 
>retune the radio.  I put a second xtal in, and got the same 
>results.  Until I was certain these xtals were bad, I put this unit aside 
>and took one of the UHF receivers, (these are being used for voter 
>receivers) and began to tune it up, based on the sugesstions of all those 
>whom were helping.  I was pulling hairs out getting nowhere.  I put this 
>one aside, went back to the crossband unit, and began the retune and they 
>came into place.  This is what makes me believe that the uhf receiver that 
>I have will not handle the high side cut.

If it's an "88" band radio (450-470 MHz) & your target RX freq. is in the 
434 MHz range, high-side LO will definitely work.  In fact, I would think 
that low-side LO would be problematic unless the LO helicals were 
modified.  OTOH if this is a 406-420 RX then high-side LO may not work.

Bob NO6B

[Repeater-Builder] Re: MSR-2000 Help.

[skipp025]

Bill, 

Go get and print out my MSR-2000 to external repeater 
controller text from  www.radiowrench.com/sonic 

I talk about the proper jumpers that need to be in 
place on the modules and on the back plane. You don't 
need to do the external controller mod to use the jumper 
info I supply

Yes it's probably a jumper issue on the squelch gate 
module. 

If you don't need the wire line dc control you might remove 
the DC transfer module only after first reading my text.  

Quick testing...  set the Squelch Gate module for 
carrier squelch (the 2 wire lead jumpers).  Make sure JU5 and 
JU6 are installed and see if the repeater operates carrier 
squelch. 

cheers, 
skipp 


> Bill Photinos <[EMAIL PROTECTED]> wrote:
>
> I am in need of some help getting a MSR2000 repeater in service.
> 
> It is a Model # C73KSB-3105BT VHF.
> 
> I have the following boards installed with the following jumper settings
> 
> Station Control Module -TRN5321A
> 
> JU1 - in
> 
> JU3 - in
> JU4 - out
> JU5 - in
> JU6 - in
> JU7 - in 
> JU8 - in
> JU9 - in 
> JU10 - in
> JU11 - out
> 
> Squelch Gate - TRN5324A
> 
> JU1 - out
> JU2 - out
> JU3 - in
> JU4 - in
> JU5 - in
> JU6 - in
> JU7 - in 
> JU8 - in
> JU9 - in 
> JU10 - in
> JU11 - in
> JU12 - out 
> JU13 - 2 sec
> JU14 - PL
> JU15 - PL
> 
> No relay on board and CR15 - out
> 
> DC Transfer - TRN5240A 
> JU1 - in
> JU2 - out
> JU3 - out
> JU4 - out
> 
> 
> R1 Audio - TRN9689APR
> JU1 - out
> JU2 - out
> 
> JU101 - in
> JU102 - in
> JU103 - out
> JU104 - could not find
> JU105 - in
> 
> CR1 - in
> CR2 - out
> CR106 - out
> 
> PL - TRN5073APR
> 
> 103.5 & 127.5 reed installed
> 
> The receiver and exciter are tuned and the PA puts out 100+ watts
when the mic is keyed.
> 
> - The repeater transmits when the local mic is keyed.
> 
> - When in pl mode the repeater unsqueches and received transmission
is heard over local speaker with a transmission with proper pl tone.
> 
> - When pl is disabled the repeater unsqueches and received
transmission is heard over local speaker with a transmission that
breaks the squelch level setting.
> 
> - When the repeater breaks squelch in either of the previous
situations from a received signal it does not transmit.
> 
> Do the above settings look ok?
> 
> Any suggestion on what to try next?
> 
> My first guess would be some kind of logic problem or jumper setting
on the Squelch gate card.  We have tried multiple combinations with no
luck. 
> 
> Thanks,
> Bill
> W4RVN
>

[Repeater-Builder] MSR-2000 Help.

[Bill Photinos]

I am in need of some help getting a MSR2000 repeater in service.

It is a Model # C73KSB-3105BT VHF.

I have the following boards installed with the following jumper settings

Station Control Module -TRN5321A

JU1 - in

JU3 - in
JU4 - out
JU5 - in
JU6 - in
JU7 - in 
JU8 - in
JU9 - in 
JU10 - in
JU11 - out

Squelch Gate - TRN5324A

JU1 - out
JU2 - out
JU3 - in
JU4 - in
JU5 - in
JU6 - in
JU7 - in 
JU8 - in
JU9 - in 
JU10 - in
JU11 - in
JU12 - out 
JU13 - 2 sec
JU14 - PL
JU15 - PL

No relay on board and CR15 - out

DC Transfer - TRN5240A 
JU1 - in
JU2 - out
JU3 - out
JU4 - out


R1 Audio - TRN9689APR
JU1 - out
JU2 - out

JU101 - in
JU102 - in
JU103 - out
JU104 - could not find
JU105 - in

CR1 - in
CR2 - out
CR106 - out

PL - TRN5073APR

103.5 & 127.5 reed installed

The receiver and exciter are tuned and the PA puts out 100+ watts when the mic 
is keyed.

- The repeater transmits when the local mic is keyed.

- When in pl mode the repeater unsqueches and received transmission is heard 
over local speaker with a transmission with proper pl tone.

- When pl is disabled the repeater unsqueches and received transmission is 
heard over local speaker with a transmission that breaks the squelch level 
setting.

- When the repeater breaks squelch in either of the previous situations from a 
received signal it does not transmit.

Do the above settings look ok?

Any suggestion on what to try next?

My first guess would be some kind of logic problem or jumper setting on the 
Squelch gate card.  We have tried multiple combinations with no luck. 

Thanks,
Bill
W4RVN

Re: [Repeater-Builder] Doug Hall Voter

[Steven Samuel Bosshard \(NU5D\)]

I have the manual and would like to buy the thing.  sb  lemme know off list - 
also DHE has the drawings.  Steve NU5D

Re: [Repeater-Builder] Welcome to 2007...

[Nate Bargmann]

Fortunately, the problem wasn't with the controller, but rather the
DTMF capable control head of the Mitreks I am using for local speaker
and microphone and to set the COR trigger level with the squelch. 
Seems I accidentally punched in the right (wrong?) code and activated
the Call feature which opened the squelch continuously.  That was one
of my suspcions as well.  Pressed the button to clear the Call on the
control head and all was well.

Now, I need to do something about the TX crystal which seems to like
drift downward...

Gr.

73, de Nate >>

-- 
 Wireless | Amateur Radio Station N0NB  |  Successfully Microsoft
  Amateur radio exams; ham radio; Linux info @  | free since January 1998.
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 My Kawasaki KZ-650 SR @| a GNU generation!"
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[Repeater-Builder] Re: wide band to cross band on narrow band

[skipp025]

> "Jim B." <[EMAIL PROTECTED]> wrote:
> Umm-I got a question-are you converting the rx to narrowband?

The receiver does both wide and narrow band scan with programming 
so it hears both band-widths/modes.  

> Otherwise, when they start putting people 7.5 Khz from your 
> input, you'll hear them-fuzzy, but you'll hear them.

I understand what you're saying but for a number of reasons it's 
not (yet) a problem. Nor do I/we expect it to be a problem with 
the described system.  But never say never... 

> I'm hearing that on VHF systems already, with off-freq 
> narrowband stuff trashing a wide-band system.

It's all about the location, receiver and various pre-selection 
& filters used. 

> Yeah, what you've got is not a bad way to transition, but 
> eventually  you'll want to pull the wideband rx's when they 
> start putting people on adjacent freqs.

It's easy enough to use an F-center detect circuit if it were a 
problem for us.  But the newer receivers are pretty tight. 

Not related to the dual-width system... I have more problems on 
VHF with co-channel legacy system distant high-powered base stations 
taking out the local mobiles on the repeater inputs. A hot summer 
day makes for even more fun when someone in another state captures 
the local traffic. 

> Jim Barbour
> WD8CHL

The example multi-width system I mentioned can actually stay in 
service long term. The user will simply stop using the wide band 
input function and the receiver system remains the same. Over time 
I would expect everyone to be forced to narrow-band but we're 
operational now in both modes and covered up until that time... 

Cheers Jim, 
skipp 

[Repeater-Builder] Re: Cavity Filter advice

[skipp025]

There is at least one special case where the feed line length 
deals with the improving the overall system performance, but 
I doubt it would be a major issue with 99% of the people on this 
group. 
s. 

> If the cavities are tuned correctly, and have no internal issues, 
> those cables lengths are irrelevant, except for losses.
> 
>  If the length _is_ a factor, then either the cavities are 
> tuned wrong, or they have a problem.
> 

[Repeater-Builder] Re: Question re: Crystal Ordering for UHF MICOR Receiver

[skipp025]

Amen Larry, 

I know of a case first hand where the crap from a micor mobile 
cost the site owner more than $10k to deal with/fix.  And the 
FCC was not the expense... 

cheers,
s. 

--- In Repeater-Builder@yahoogroups.com, "[EMAIL PROTECTED]"
<[EMAIL PROTECTED]> wrote:
>
> That's for sure about the MICOR UHF transmitter - follow the
instructions, including the special MICOR section notes on the
Repeater-Builder web site. Lately, every UHF MICOR Repeater
transmitter that  I've converted to the 440-450 ham band has had a
big, nasty spur about 30 MHz above the desired  Transmit frequency.
I've tuned the filters, circulator, etc. but one transmitter in
particular gave me fits.
> 
> I tried tuning the exciter filter repeatedly (which is actually a
VHF exciter, 1/3 of the intended UHF transmit frequency) using a
signal generator and spectrum analyzer. I tried different exciters,
filters,  IPAs, 75-watt PA decks, etc. but still had that big spur. I
finally hit on the right combination of tweaks in the exciter filter
by just using a VHF hand-held radio on the exciter's frequency and
looking for maximum output at the filter output on a wattmeter/dummy
load. Success, finally - everything was clean.
> 
> A few weeks ago, I was "volunteered" to help another local Repeater
group go through their 75-Watt UHF MICOR Repeater, since I had just
done one for myself and everything was still fresh in my memory about
the things to look out for.  Sure enough, this one also had a big spur
about 30 MHz above the 440 transmit frequency. We'd never have known
except by looking at the spectrum analyzer, and by the excessive power
loss through the duplexer since a bunch of the Power Output was not on
the intended frequency. This time, I took their exciter filter out,
tuned it for maximum power output with the VHF handheld and
wattmeter/dummy load and then reinstalled it. Everything was clean and
all the power output was on the desired 440 frequency. Lesson learned
and verified a second time
> 
> LJ

[Repeater-Builder] Mini Audio Amplifier time...

[skipp025]

Mini Audio Amplifier time... 

It would be some of the best money spent on handy test gear if 
many of you picked up a Radio Shack Mini Audio Amplifier. 

Part Number: 277-1008

http://www.radioshack.com/product/index.jsp?productId=2062620&cp

Runs $12.99 and based on the time it will save you... well 
worth the buck'ola's you'll spend. 

You can use this handy beast for service, repairs and in the 
case of the last emph & de-emph thread/posts to actually hear the 
audio at various stages in your repeater system. 

Runs on 9 volts so it's easily portable. The two side mounted 
jacks allow you to use it for audio or even a line driver 
application. In the current solar repeater thread you wouldn't 
in even need to have the original equipment audio hardware 
installed. Just bring along the mini amp for testing... 

You can also remove the amplifier pc-board from the plastic 
case and install it in various project locations... temp or 
perm. 

I'm sure more than one of you have run into one of these 
amplifiers applied into a circuit temp and it was never 
removed or changed. 

When I speak to some of you on the phone about testing audio 
I always try to convey how handy this "little bugger" can be. 

Makes for easier trouble-shooting and if you're crafty enough 
to make an rf probe, it will detect and amplify various rf 
circuits/stages.  Some of you might also harken back to the 
original Radio Shack "Signal Tracer", which is pretty much an 
equivalent function/device. 

If you don't have one... it might be the best $12.99 you've 
spent this month.  Be sure to get the 9v battery and a 1/8 
inch phono plug along with some shielded wire. Or buy the 1/8 
inch on both ends jumper (from the shack) and cut it in half. 

cheers,
s. 


> "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote:
> Repeater audio amplifier stage to greatly reduce the standby 
> current, with a switch to re-enable the audio PA for maintenance 
> while at the site.

Re: [Repeater-Builder] Doug Hall Voter

[Jim B.]

w8akr_8 wrote:
> I have an old (1987 or so) Doug Hall Voter. Has anyone a schmatic for
> this thing?  It is a 4 channel voter with 5 LM324's lined up across
> the top of the board. 8 LEDs opposite the card edge connector, with 5
> pots above them... I would like to sell this thing, but would like to
> have the manual to go with it any help?
> 
> Thanks, Dick W8AKR

Go to:

I expect you'll find a manual there.
You won't find a full schematic. The full schematic has never been 
published.
-- 
Jim Barbour
WD8CHL

Re: [Repeater-Builder] happy new year.

[Jim B.]

N9WYS wrote:

> http://www.hamband.com/html/the_ham_band.html

> Catchy tune, though!

I just keep wondering why all these 'ham radio' tunes are always
country ...|cP

-- 
Jim Barbour
WD8CHL

Re: [Repeater-Builder] Re: wide band to cross band on narrow band

[Jim B.]

skipp025 wrote:

> Well... I set up a repeater for an agency with 4 options.  One 
> wideband input is converted to narrow band tx. The standard narrow 
> band input is through the machine. Another current operation 
> is full wideband through and a last option is narrow in to wideband 
> out...   all easily user selected with ctcss. The system works 
> well now and will work well when the mandate kicks in. Also 
> keep in mind that most all narrow/wide bets are off in a true 
> emergency. 

Umm-I got a question-are you converting the rx to narrowband?
Otherwise, when they start putting people 7.5 Khz from your input, 
you'll hear them-fuzzy, but you'll hear them.
I'm hearing that on VHF systems already, with off-freq narrowband stuff 
trashing a wide-band system.
Yeah, what you've got is not a bad way to transition, but eventually 
you'll want to pull the wideband rx's when they start putting people on 
adjacent freqs.
-- 
Jim Barbour
WD8CHL

Re: [Repeater-Builder] Re: Bomar Crystals Ordered, Figured it out

[Jim B.]

Mathew Quaife wrote:
> This is what
> makes me believe that the uhf receiver that I have will not handle
> the high side cut.

Actually, I have my doubts about a 450-470 split rx making it down to 
434 without some serious work. I know a Micor won't do it.
You should use a 403-430 split rx instead.
-- 
Jim Barbour
WD8CHL

Re: [Repeater-Builder] Cavity Filter advice

[Jim B.]

Doug Hutchison wrote:
> Hello,
> 
> Seeking some guidance re the correct length of cable to use between 
> cavity and transmitter, cavity and receiver on a dual antenna system. 
> (each line has its own BP/BR filters for the moment)
> 
> Is it 1/4 wave or are multiples of 1/4 wave acceptable? 
> 
> Doug - GM7SVK

If the cavities are tuned correctly, and have no internal issues, those 
cables lengths are irrelevant, except for losses.
If the length _is_ a factor, then either the cavities are tuned wrong, 
or they have a problem.

-- 
Jim Barbour
WD8CHL

Re: [Repeater-Builder] Need help troubleshooting a Motorola Mitrek UHF

[Jim B.]

ai4sb wrote:
> Hello and thanks for reading!!
> 
> ok, I have a motorola mitrek UHF converted to the ham band. I have the 
> control cable attach and I attach a local speaker to the green and 
> orange wires then I apply power... 


umm-check that again-normally the green and orange loose wires are +12V 
input to the radio, not speaker out. But I don't remember the colors of 
the wires inside the control cable.

-- 
Jim Barbour
WD8CHL

Re: [Repeater-Builder] wide band to cross band on narrow band

[Jim B.]

johnkihl wrote:
> Scott,
> 
> The CAP is going from wideband FM to narrowband FM in
> a few months, We are exploring the Idea of using the old
> GE master II machine on 155.160 and crossbanding it with 
> the new Motorola quantar Narrowband machine.freq pair for
> interoperability.

Hmmm-don't quite understand what CAP is doing on a medical/public safety 
freq. They should down below 150.8 I think? They fall under federal 
freqs, not FCC, governed by NTIA.

> The question that comes to mind is how to you convert the
> audio deviation from wide to narrow and back again, in a
> cost effective manner.?

It's strictly a question of audio levels in the patch between the two. 
Make sure you have the right level going from each rx to each tx to 
properly drive them, and the transmitters will take care of making it 
the right deviation
-- 
Jim Barbour
WD8CHL

Re: [Repeater-Builder] Re: Question re: Crystal Ordering for UHF MICOR Receiver

[[EMAIL PROTECTED]]

That's for sure about the MICOR UHF transmitter - follow the instructions, 
including the special MICOR section notes on the Repeater-Builder web site. 
Lately, every UHF MICOR Repeater transmitter that  I've converted to the 
440-450 ham band has had a big, nasty spur about 30 MHz above the desired  
Transmit frequency. I've tuned the filters, circulator, etc. but one 
transmitter in particular gave me fits.

I tried tuning the exciter filter repeatedly (which is actually a VHF exciter, 
1/3 of the intended UHF transmit frequency) using a signal generator and 
spectrum analyzer. I tried different exciters, filters,  IPAs, 75-watt PA 
decks, etc. but still had that big spur. I finally hit on the right combination 
of tweaks in the exciter filter by just using a VHF hand-held radio on the 
exciter's frequency and looking for maximum output at the filter output on a 
wattmeter/dummy load. Success, finally - everything was clean.

A few weeks ago, I was "volunteered" to help another local Repeater group go 
through their 75-Watt UHF MICOR Repeater, since I had just done one for myself 
and everything was still fresh in my memory about the things to look out for.  
Sure enough, this one also had a big spur about 30 MHz above the 440 transmit 
frequency. We'd never have known except by looking at the spectrum analyzer, 
and by the excessive power loss through the duplexer since a bunch of the Power 
Output was not on the intended frequency. This time, I took their exciter 
filter out, tuned it for maximum power output with the VHF handheld and 
wattmeter/dummy load and then reinstalled it. Everything was clean and all the 
power output was on the desired 440 frequency. Lesson learned and verified a 
second time

LJ



-Original Message-
>From: skipp025 <[EMAIL PROTECTED]>
>Sent: Jan 2, 2007 9:51 AM
>To: Repeater-Builder@yahoogroups.com
>Subject: [Repeater-Builder] Re: Question re: Crystal Ordering for UHF MICOR 
>Receiver
>
>> On a UHF Micor, AFC is not an option, it's a standard feature.  
>> UNLESS you are going to disable the AFC functionality of your 
>> UHF Micor receiver, you'll need to flip the diode polarity 
>
>I found it easier to disable the AFC. If you don't...  with a poor 
>quality crytal in a not so stable (temp) room you'd often find your 
>repeater quite aways below F-center in the cool morning and quite 
>aways above F-center in the hot evenings.  Being the owner of a 
>"VFO Repeater" was not something to be proud of.  T'was one of my 
>first real cases of buying cheap crystals that became obvious 
>real fast. 
>
>Since I never wanted the afc action in the repeater conversions... 
>I never bothered to change the diodes... I just disabled the AFC. 
>
>> > [EMAIL PROTECTED] wrote:
>> > OK thanks - I'm trusting then also that I can do the same on 
>> > UHF, order high-side injection crystals for my KXN1024A UHF 
>> > Receiver channel element and leave the discriminator diodes 
>> > as they are.
>
>Where I learned the gals at International Crystal know their stuff 
>very well.  If you call and specify the UHF Micor Mobile Crystal for 
>a KXN-1024 with high side injection... they know what you want and 
>how to make it with out 100 extra questions. 
>
>Once you get the channel element done right... you need to be sure 
>you follow the proper manual transmitter alignment instructions. A 
>shortcut in the tx alignment steps can result in a very nasty 
>transmitter. 
>
>cheers, 
>skipp 
>

[Repeater-Builder] Re: Toko Filters For Sale

[jeffk]

I still have more filters.  Does anyone else want to put a Maxtrac on
902 MHz?

'JK

--- In various yahoo groups, W6JK wrote:
>
> I have a supply of the TOKO 6DFB-915E-10 filters for
> MaxTrac 902 MHz conversions. I'm offering them to members of the Group
> for $20 per pair shipped, first come first served. I accept PayPal,
> USPS money orders, and personal checks. Email me to make payment
> arrangements.
>
> [EMAIL PROTECTED]
>
> 73,
> Jeff W6JK
>

Re: [Repeater-Builder] MICOR Receiver Low Power Mod for Solar Site?

[Kevin Custer]

[EMAIL PROTECTED] wrote:
> Several of us are looking at putting up a low-power UHF MICOR Repeater at 
> some Solar Power sites. Standby receive power drain, of course, needs to be 
> as low as possible. 
>
> I have a copy of a modification that was done to a MASTR II VHF Repeater 
> audio amplifier stage to greatly reduce the standby current, with a switch to 
> re-enable the audio PA for maintenance while at the site.
>
> Has anyone ever done something similar for a MICOR receiver? The audio amp 
> stages are quite different between a MICOR and a MASTR II.

Two ways... remove the audio amplifier transistor assembly and install a 
LM-386 audio amp in its place; switch the LM-386 on/off with a manual 
switch.
Or, you can enable/disable the OEM audio amplifier by placing a switch 
in the lead going to pin 16 of the Audio & Squelch board.  This will 
work with any Micor, mobile or station, on any band as pin 16 is always 
Audio A+.

Kevin

[Repeater-Builder] MICOR Receiver Low Power Mod for Solar Site?

[[EMAIL PROTECTED]]

Several of us are looking at putting up a low-power UHF MICOR Repeater at some 
Solar Power sites. Standby receive power drain, of course, needs to be as low 
as possible. 

I have a copy of a modification that was done to a MASTR II VHF Repeater audio 
amplifier stage to greatly reduce the standby current, with a switch to 
re-enable the audio PA for maintenance while at the site.

Has anyone ever done something similar for a MICOR receiver? The audio amp 
stages are quite different between a MICOR and a MASTR II.

Thanks,
Larry

[Repeater-Builder] Re: Question re: Crystal Ordering for UHF MICOR Receiver

[skipp025]

> On a UHF Micor, AFC is not an option, it's a standard feature.  
> UNLESS you are going to disable the AFC functionality of your 
> UHF Micor receiver, you'll need to flip the diode polarity 

I found it easier to disable the AFC. If you don't...  with a poor 
quality crytal in a not so stable (temp) room you'd often find your 
repeater quite aways below F-center in the cool morning and quite 
aways above F-center in the hot evenings.  Being the owner of a 
"VFO Repeater" was not something to be proud of.  T'was one of my 
first real cases of buying cheap crystals that became obvious 
real fast. 

Since I never wanted the afc action in the repeater conversions... 
I never bothered to change the diodes... I just disabled the AFC. 

> > [EMAIL PROTECTED] wrote:
> > OK thanks - I'm trusting then also that I can do the same on 
> > UHF, order high-side injection crystals for my KXN1024A UHF 
> > Receiver channel element and leave the discriminator diodes 
> > as they are.

Where I learned the gals at International Crystal know their stuff 
very well.  If you call and specify the UHF Micor Mobile Crystal for 
a KXN-1024 with high side injection... they know what you want and 
how to make it with out 100 extra questions. 

Once you get the channel element done right... you need to be sure 
you follow the proper manual transmitter alignment instructions. A 
shortcut in the tx alignment steps can result in a very nasty 
transmitter. 

cheers, 
skipp 

Re: [Repeater-Builder] Question re: Crystal Ordering for UHF MICOR Receiver

[[EMAIL PROTECTED]]

Just what I needed - thanks Kevin!

Larry

-Original Message-
>From: Kevin Custer <[EMAIL PROTECTED]>
>Sent: Jan 2, 2007 5:29 AM
>To: Repeater-Builder@yahoogroups.com
>Subject: Re: [Repeater-Builder] Question re: Crystal Ordering for UHF MICOR 
>Receiver
>
>All,
>
>On a UHF Micor, AFC is not an option, it's a standard feature.  UNLESS 
>you are going to disable the AFC functionality of your UHF Micor 
>receiver, you'll need to flip the diode polarity - all four, when going 
>to the opposite injection.  There are four diodes in the UHF Micor 
>receiver as the discriminator rectifiers operate as (I believe) a 
>voltage doubler; increasing the output voltage available from the 
>discriminator.  I believe this was done for one simple reason; to 
>eliminate the need of a voltage amplifier to run the AFC varactor in the 
>channel element.  In UHF, because of higher multiplication factor, the 
>channel element fundamental needs less change to keep the receiver 
>centered; as compared to a VHF LO.  So, in UHF, a Micor discriminator 
>built with a voltage doubler supplies enough voltage to the channel 
>element varactor without the need for a AFC amplifier.
>
>Eric is correct where the VHF Micor receiver conversion is concerned, 
>unless you are using the K1006 and companion AFC amplifier option, 
>swapping the diode polarity is not a necessity; UNLESS you are using the 
>receiver for something like digital communications or in a simulcast 
>repeater system where audio polarity to the voter is (can be) important.
>
>A way to remove and swap the polarity of these fragile diodes is to snip 
>them out with a sharp pair of dikes, instead of de-soldering them.  
>Then, simply tack solder them back in, after reversing polarity; of course.
>
>On your 2 meter Micor receivers with Low Side Injection, likely the 
>capacitors in the LO weren't changed from their original 150.8 to 162 
>MHz. values.  When converting a 150.8 to 162 split Micor VHF receiver to 
>the 142 - 150.8 split, you have a choice; change the caps and use HSI, 
>or leave the caps alone and use LSI.  We at Repeater Builder change the 
>caps and order HSI crystals.
>
>On a UHF Micor receiver that was built for the 450 - 470 split, ham band 
>sensitivity can be somewhat less than expected - wanted.  Here is an 
>article that can help with that:
>
>
>Hope this helps...
>Kevin Custer
>
>
>[EMAIL PROTECTED] wrote:
>> OK thanks - I'm trusting then also that I can do the same on UHF, order 
>> high-side injection crystals for my KXN1024A UHF Receiver channel element 
>> and leave the discriminator diodes as they are.
>>
>> Thanks again,
>> Larry
>>
>>
>>
>>
>>   
>>> Larry,
>>>
>>> I don't think the diode polarity matters, unless you are using channel
>>> elements with built-in AFC controls.  I've converted a few high-band VHF
>>> MICORs without touching the diodes, and they work just fine.
>>>
>>> 73, Eric Lemmon WB6FLY

Re: [Repeater-Builder] Question re: Crystal Ordering for UHF MICOR Receiver

[Kevin Custer]

All,

On a UHF Micor, AFC is not an option, it's a standard feature.  UNLESS 
you are going to disable the AFC functionality of your UHF Micor 
receiver, you'll need to flip the diode polarity - all four, when going 
to the opposite injection.  There are four diodes in the UHF Micor 
receiver as the discriminator rectifiers operate as (I believe) a 
voltage doubler; increasing the output voltage available from the 
discriminator.  I believe this was done for one simple reason; to 
eliminate the need of a voltage amplifier to run the AFC varactor in the 
channel element.  In UHF, because of higher multiplication factor, the 
channel element fundamental needs less change to keep the receiver 
centered; as compared to a VHF LO.  So, in UHF, a Micor discriminator 
built with a voltage doubler supplies enough voltage to the channel 
element varactor without the need for a AFC amplifier.

Eric is correct where the VHF Micor receiver conversion is concerned, 
unless you are using the K1006 and companion AFC amplifier option, 
swapping the diode polarity is not a necessity; UNLESS you are using the 
receiver for something like digital communications or in a simulcast 
repeater system where audio polarity to the voter is (can be) important.

A way to remove and swap the polarity of these fragile diodes is to snip 
them out with a sharp pair of dikes, instead of de-soldering them.  
Then, simply tack solder them back in, after reversing polarity; of course.

On your 2 meter Micor receivers with Low Side Injection, likely the 
capacitors in the LO weren't changed from their original 150.8 to 162 
MHz. values.  When converting a 150.8 to 162 split Micor VHF receiver to 
the 142 - 150.8 split, you have a choice; change the caps and use HSI, 
or leave the caps alone and use LSI.  We at Repeater Builder change the 
caps and order HSI crystals.

On a UHF Micor receiver that was built for the 450 - 470 split, ham band 
sensitivity can be somewhat less than expected - wanted.  Here is an 
article that can help with that:


Hope this helps...
Kevin Custer


[EMAIL PROTECTED] wrote:
> OK thanks - I'm trusting then also that I can do the same on UHF, order 
> high-side injection crystals for my KXN1024A UHF Receiver channel element and 
> leave the discriminator diodes as they are.
>
> Thanks again,
> Larry
>
>
>
>
>   
>> Larry,
>>
>> I don't think the diode polarity matters, unless you are using channel
>> elements with built-in AFC controls.  I've converted a few high-band VHF
>> MICORs without touching the diodes, and they work just fine.
>>
>> 73, Eric Lemmon WB6FLY