Re: [Repeater-Builder] Connected

[Q]

We use just two receivers,tuned to the opposite repeaters output. The
repeaters have CTCSS on COS which makes them transparent.Look Ma,NO
transmitters! K.I.S.S.
From: Virden Clark Beckman [EMAIL PROTECTED]

 2 continuos duty uhf radios, 2 feedline runs, 2 beam style antennas, 2
 power supplies, I think I would try setting the output power at 5-7
 watts first and a open radio port on each end that can be configured to
 operate as you would desire, probably 2 ctcss detectors so either one
 knows when the sister has a user and when it is ok to use the system.

 Rich wrote:
 
  What radio equipment do I need to connect two 25 Watt UHF repeaters
  together, at a distance of 10 miles mountain top to mountain top.
 73...Clark Beckman N8PZD








 
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Re: [Repeater-Builder] Infomation Needed

[Bob N2BR]

dont know about card yet waiteing on key to cabnet so
i can look more into it
--- Neil McKie [EMAIL PROTECTED] wrote:
 
   C - Compa cabinet - either 30 or 41 high 
   7 - 110 Watts out - Intermittent duty 
   3 - 136 - 174 MHz range 
   R - R Series (Micor) Receiver
   T - T Series (Micor) Transmitter 
   B - Base or repeater depending on the config from
 the factory
   3 - CTCSS - Private Line operation 
   1 - Narrow band - +/- 5 kHz deviation 
   0 - factory 1 freq transmit / 1 freq receive 
   3 - ??
   C - C Series of manufacture 
   M - May have come with a microphone as a base
 station. 
 
   What plug-in cards are on the control shelf? 
 
   Neil  - WA6KLA 
 
 
 Bob wrote:
  
  I have a Micor or Mitrek Repeater or what i think
 is a repeater.Here
  the Model number can anyone tell me what it is
  
  Model Number C73RTB/3103CM
  
  Bobby/N2BR
  
 
 
 
 
 
 
  
 Yahoo! Groups Links
 
 
  [EMAIL PROTECTED]
 
  
 





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Re: [Repeater-Builder] Re: Audio Reproduction

[Joe Montierth]

--- [EMAIL PROTECTED] wrote:
 Hi Joe,
 
 This is an interesting article:
 

http://www.repeater-builder.com/rbtip/fmtheorydiscussion.html
 
 He suggests that de-emph came first to get around
 the
 rising noise of an FM receiver. In any case, I think
 most people agree that it was done for noise control
 purposes, which it does do well. If not, it would
 have
 been abandoned.
 
 I disagree because there is no possible way to
 abandon it. The author says 
 this: 
 In the early days of FM, there were no varactor
 diodes so it was difficult, 
 at best, to produce a direct FM modulator. PM
 modulation was, however, easy to 
 achieve which is the reason that it was the
 standard.
 I agree completely. So if PM is the standard, and it
 creates preemphasis on 
 an FM demodulator, then you have no choice but to
 deemphasize if you want to 
 recover flat audio. It's not like the designers ever
 had a choice.
 
 
 Regarding links or repeaters with flat audio: I
 think
 that the only place the audio should be pre or de
 emped is in the end users radio, or in items that
 communicate as an end user (phone patches, voice
 synthesizers, etc.) There is no need to pre and de
 emp
 at a repeater, and especially no good reason for
 doing
 it on links.
 
 I'm rather surprised, then, that you pointed out the
 article. At the end of 
 the last paragraph, the author says what I have
 maintained for years:
 
  I am not a believer in pulling receiver audio off
 the discriminator and 
 directly into a flat transmitter. That originated
 in the ham circles and I don't 
 believe that it will produce audio any better than
 doing it right the first 
 time! Let the pre-emphasis and de-emphasis circuits
 do their job (it really 
 results in a fairly flat response) and pay attention
 to the clipping levels. 
 You'll have great audio and you will keep your
 deviation within spec, which is 
 mandatory in today's FM bands. Actually, if we could
 get everyone to adjust 
 their repeater deviation to 4 kHz, a lot of adjacent
 channel problems would be 
 reduced to acceptable levels. Just a thought.. 
 
 Thank you, Paul, K3VIX (a 26-year Motorola veteran
 designer).
 
 73,
 Bob
   

I said it was an interesting article, I didn't say I
agree with it comepletly.

Anyone who has tried to link multiple sites together
using the stock Micor (or other) base station audio
knows it gets muddier and muddier as you go through
links. You start getting a rounded frequency
response. On a single repeater, this is not
necessarily bad. Thats why there are so many good
sounding MII and Micor repeaters out there. But most
of them don't have simplex sound, and if you go
through 2 or three of these systems it starts to sound
like you're talking inside a 55 gallon drum.

I think his comment is directed at those that are
constructing a single RX/TX combo, such as a plane
jane Micor RPT. It has been mentioned by someone else
that land mobile radios were not designed for multiple
links, and this is true. Thats why if you want to use
them for such, you have to go in and somehow correct
the deficiencies in the RX and TX audio. The easiest
way to do that is to go in and get your discriminator
audio flat and then get your TX modulator audio
flat. At that point, it doesn't take a lot of rocket
surgery (or brain science) to get good link audio,
it's basically set the output the same as the input.

 I agree completely. So if PM is the standard, and it
 creates preemphasis on 
 an FM demodulator, then you have no choice but to
 deemphasize if you want to 
 recover flat audio. It's not like the designers ever
 had a choice.

Remember, these people were using a PM transmitter to
create indirect FM, not PM. If you want to have a
clipper or limiter, which is required by FCC rules,
then at some point you have to have FM in your
exciter. You can't clip audio and feed it to a PM
transmitter, the results would be horrible. Again,
here's the way it works in a PM exciter. Mike audio
comes in and get's pre-empted. Pre-empted audio is
clipped and applied to a LPF. LPF audio is DE-EMPED
and then fed to a PM. What do you call de-empted audio
thats fed to a PM? It's called indirect FM, or simply
FM. In a direct FM modulator, here's what happens.
Mike audio comes in and is pre-emped. PE audio is
clipped and applied to a LPF. LPF audio is directly
applied to the FM modulator. The only difference
between the two is a single de-emp network, only
required in a PM transmitter. The only pupose of that
DE network is to turn the PM modulator into an FM
modulator, at least over the area of interest, the
voice band.

Joe




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Re: [Repeater-Builder] Infomation Needed

[Neil McKie]

  What is the height (in inches) of the cabinet? 

  Neil 


Bob N2BR wrote:
 
 dont know about card yet waiteing on key to cabnet so
 i can look more into it
 --- Neil McKie [EMAIL PROTECTED] wrote:
 
C - Compa cabinet - either 30 or 41 high
7 - 110 Watts out - Intermittent duty
3 - 136 - 174 MHz range
R - R Series (Micor) Receiver
T - T Series (Micor) Transmitter
B - Base or repeater depending on the config from
  the factory
3 - CTCSS - Private Line operation
1 - Narrow band - +/- 5 kHz deviation
0 - factory 1 freq transmit / 1 freq receive
3 - ??
C - C Series of manufacture
M - May have come with a microphone as a base
  station.
 
What plug-in cards are on the control shelf?
 
Neil  - WA6KLA
 
 
  Bob wrote:
  
   I have a Micor or Mitrek Repeater or what i think
  is a repeater.Here
   the Model number can anyone tell me what it is
  
   Model Number C73RTB/3103CM
  
   Bobby/N2BR
  
  
 
 
 
 
 
 
  Yahoo! Groups Links
 
 
   [EMAIL PROTECTED]
 
 
 
 
 
 
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Re: [Repeater-Builder] Hamtronics exciter

[Kevin Custer]

[EMAIL PROTECTED] wrote:

  
  
  Hi Kevin,
  
  
  
  
  
  
  Virgil mentioned thathe had looked at the
manual and noted that the TA-51 uses RC phase modulation. A-ha! The
light went on. You can only get 90 degrees of phase shift max with an
RC circuit.Had they used an LC phase modulator, they would have gotten
180 degrees max. That's why the deviation is low with that unit. They
don't have much deviationto start with, and as you say, if it
isn'tmultiplieda lot, it'llbe low at the final freq.
  


Tell Virgil thanks for the investigation. Also as a side note from
practical experience with this type of exciter, and as you have
mentioned before as well, the tuning of the first stages after the
oscillator are critical for good modulation, otherwise it will be very
distorted.

Kevin














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[Repeater-Builder] Need help with APCOR repeater

[slars1327]

Hi All,
I am finally going to try and get this little project done.

I am in need of help to freq and tune a Moto Apcor medical radio into 
a repeater for voice only. I really need someone out there who is 
familiar with the Apcor setup that can either help me in this endevor 
or do the work at their shop.The unit will be used as a portable 12 
watt repeater that I can put into service as needed at various events.

I had gotten ready to start this about a year and 1/2 ago but some 
health troubles caused a delay.

So if you have experience in the Apcor line please drop me an e mail 
and see what we can figure out.

Thanks in advance,
Slars






 
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Re: [Repeater-Builder] Syntor X Control Cable

[Matt Krick]

Danke, but all I got is this ASCII text which is all scrambled, any way you
could sketch something with paint?

Michel-A Allard wrote:

  Hello Matt

Both pot are 25K, audio taper.

Radio J1 pin 14  _
  /
  \
Radio J1 pin 3   /   Volume (25K)
  \
  /
3.3K  \
Radio J1 pin 2  _/\/\/\/\_/

3.3K
Radio J1 pin 2  _/\/\/\/\_
  /
  \
Radio J1 pin 28 /   Squelch (25K)
  \
  /
Radio J1 pin 14  _\

For mode select tying pin 13 and 14 on J1 will select Mode 1.

Hope this help, 73 de Michel VA2MAA

[EMAIL PROTECTED]


- Original Message -
From: "Matt Krick" [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Monday, April 12, 2004 3:31 PM
Subject: [Repeater-Builder] Syntor X Control Cable


  
  
Does any one have information on the value of pots and or capacitors used

  
  on a Syntor X control head for the volume and squelch signals?  Or can
somebody draw a sketch of what does what?  I had a manual but some one
disapeared with it.
  
  

Thanks

--Matt





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[Repeater-Builder] Looking for UHF BpBr Duplexer

[uplink28]

I'm looking to buy a set of UHF BpBr duplexers. If you have any 
please drop me an email at [EMAIL PROTECTED] 
Thanks.





 
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Re: [Repeater-Builder] Infomation Needed

[Mike Morris WA6ILQ]

At 04:07 PM 4/13/04 +, you wrote:

I have a Micor or Mitrek Repeater or what i think is a repeater.Here
the Model number can anyone tell me what it is

Model Number C73RTB/3103CM

Bobby/N2BR

The Rosetta Stone for Micor model numbers is at
http://www.repeater-builder.com/pix/micor-mobile-and-base-model-numbers.gif

Mike WA6ILQ






 
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RE: [Repeater-Builder] Re: Audio Reproduction

[Jeff DePolo WN3A]

 I guess I'm not following your logic. If you could get
 a PM exciter to produce a .01 Hz tone at 5 KHz
 deviation, the amount of audio required at 1 Hz would
 be 40 dB below that. The amount of audio required to
 modulate 5Khz deviation at 1KHz tone would be 60 dB
 below the 1 Hz level, or 100 dB below the .01 Hz
 level.
 
 This means that a modulator that could produce a .01
 Hz tone at 5 KHz of modulation for 1 volt P to P would
 only require 10 micro volts P to P at a 1 KHz tone.
 Thats a very small level in anyone's book, and the SNR
 would be garbage, since most audio type amps only have
 120 to 130 dB of maximum dynamic range.
 
 I'm not limiting the PM designs to varactor. Any
 true PM modulator has a 6 dB/octave curve, and
 therefore falls under this calculation. If the audio
 deviation doesn't increase by 6 dB/octave, you don't
 have a true PM.

1.  It seems that you keep reverting to logic that is bound by limitations
in audio dynamic range and S/N rather than sticking to what we were
originally discussing - the theoretical capabilities of PM (which, again,
has an LF cutoff of DC).

2.  You can create PM via digital techniques that wouldn't be constricted by
analog world limitations like dynamic range and S/N.  This isn't black
magic; modern FM broadcast exciters have been doing this for years.

3.  Even in an analog design, there's nothing to say that you have to have
one audio path/stage that the audio passes through.  You can have a
low-level amplifier that is used for high frequencies (those requiring less
amplitude), and a high-level amplifier for lower frequencies, the output of
which two would be summed prior to the modulator.  Again, this is a moot
point since we're debating the theoretical capabilities of PM, not the
real-world implementations.

4.  Regarding your comment that 10 microvolts P-P is a very small level and
the SNR would be garbage, a typical dynamic mic has an output around -100
dBV (10 microvolts) at an SPL of 50.  It's not a ridiculously-low audio
level to deal with in the AF domain...

One more time for the folks in the cheap seats - THERE IS NO THEORETICAL LF
LIMIT FOR PHASE MODULATION!

--- Jeff

Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant 






 
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Re: [Repeater-Builder] Re: Audio Reproduction

[Jim B.]

[EMAIL PROTECTED] wrote:
  Actually, if we could get everyone to adjust
 their repeater deviation to 4 kHz, a lot of adjacent channel problems would 
 be 
 reduced to acceptable levels. Just a thought.. 
 
 Thank you, Paul, K3VIX (a 26-year Motorola veteran designer).
 
 73,
 Bob
   
 

Especially since commercial standards (which is what all these radios 
are built for) mandates no more than +/-5Khz of deviation TOTAL. This 
includes CTCSS or other signalling that may be present during speech. So 
when you subtract that-CTCSS is typically +/-700hz, LTR is spec'd for 
+/-1 Khz-setting voice at +/-4Khz for voice with no signalling present 
is the end result.
-- 
Jim Barbour
WD8CHL





 
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RE: [Repeater-Builder] Looking at a UHF repeater...

[Juber, Stanley C.]

What do you plan to use the repeater for?

The 10 national MED frequencies are used only for emergency medical
communications between ambulances, dispatchers, and hospitals.  Generally, a
couple of the channels are reserved for dispatch, and the rest are assigned
for the ambulances to communicate with hospital emergency rooms.  The exact
use for each channel, as well as frequency coordination for these channels,
must be approved by your state's emergency medical service (EMS) regulatory
agency - and the EMS regulatory agency must sign off on your application if
you plan to use the MED frequencies, or other frequencies reserved for
medical use.  

For example, in Connecticut (I'm a Connecticut EMT, and former Director of
an ambulance service), ambulances use frequencies other than MED channels as
their primary dispatch channel.   We use MED 9 and MED 10 to communicate
with the regional dispatch centers.  The state is divided into regions, and
each region will use either MED 9 or MED 10 as its primary regional
frequency (neighboring regions use the alternate MED dispatch channel to
reduce interference).  There is a different PL tone for each region, but the
radios also have a state-wide PL tone so that an ambulance from one region
can communicate when operating in a different region.  If we need to
communicate from an ambulance to the hospital, one of the other MED channels
(1-8) is assigned by the regional dispatch center on a case-by-case basis.

My point is, that use of the MED channels is highly structured, and you need
to make sure that what you want to do fits in with your state's plan.  The
folks in charge of your emergency room should be able to tell you which
agency regulates EMS in your state. 


Stan



 It sounds like you want to 

- Original Message -
From: Ray Brown [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Sunday, April 11, 2004 11:42 PM
Subject: [Repeater-Builder] Looking at a UHF repeater...


   Howdy, everyone. I have an option to buy a working, used repeater from a
friend of mine.
 It's a Motorola, formerly owned by our local ambulance company. Looks like
it was in
 operation from 1988 until at least 1994.

   The model is C64RCB-3105AT. According to Kevin's info on the web page,
it is a
 Compra-Station, between 70 and 99 watts, 403-512 MHz, RC series (?), 120
VAC,
 PL, Narrow channel, T1/R1, DC remote, and RT repeater. It's on 462.975 /
467.975,
 with a PL.

   It looks like everything's there... PA, exciter, card cage, reciever,
power supply, and
 the 4 cavities. It has the Squelch Gate, TimeOut timer, DC transfer,
Station control
 and Line driver cards installed. I have NOT turned it on yet, wondering if
there might
 be some issue with the p/s caps, being suddenly turned on after being off
for several
 years, don't want it to go up in smoke, eh? :-)

   SO... this brings up a bunch of questions. Some directly apply, others,
well, we're not
 all amateurs here, are we? :-)

   1) He's asking $200. Does that sound like a good price for it? :-)

   2) What's the duty cycle? And, if it said narrow channel, is it 12.5 MHz
spacing,
 or 25?  I'm eventually going to put it in my hospital, which ironically
does NOT have
 any equipment on this frequency or any of the local med frequencies, but
it'd be
 nice to put in 12.5-capable equipment, otherwise I may just convert it to
amateur.

   3) Our competing hospital, 1.5 miles away (only 2 of us left here in
town) is licensed
 for all the med frequencies but I don't think they use any of them. The
ambulance system
 (our hospitals jointly owns the ambulance) dropped all its' med licenses a
couple of years
 ago... In fact, I'm not sure they have current licenses for their HEAR
radios, and they use
 city-owned radios for dispatch and talking to the hospitals. So... what
kind of traffic is
 allowed on a med freq?

   4) And finally, I know I got to go thru our radio coordination (IAFC, I
believe)
 before I file with the FCC but... trying to look at FCC form 1070, I think
we'd be
 under LMRS, PMRS, below 470 MHz, which would be $150... right? And I
 wonder if I really need to go thru the IAFC? :-)

   I thank you for your time.

 _Ray_KBØSTN







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Re: [Repeater-Builder] maxar 80 5 watt

[Russell Filling]

Title: Re: [Repeater-Builder] maxar 80 5 watt





any news yet randy 
?
Russ
N3TIH


  - Original Message - 
  From: 
  Randy Elliott 
  
  To: Repeater-Builder@yahoogroups.com 
  
  Sent: Friday, April 09, 2004 10:39 
  AM
  Subject: Re: [Repeater-Builder] maxar 80 
  5 watt
  Hi RussI scanned the schematic and sent it to your PM but 
  it came back undelivered. Give me a couple of days, it's good Friday up here 
  so we are doing the family visiting thing.Randy
  From: "Russell Filling" [EMAIL PROTECTED]Reply-To: Repeater-Builder@yahoogroups.comDate: 
Thu, 8 Apr 2004 22:16:00 -0400To: Repeater-Builder@yahoogroups.comSubject: 
Re: [Repeater-Builder] maxar 80 5 watt
  Randy did you 
find that file yet ??RussN3TIH
- Original Message - From: Randy Elliott 
  mailto:[EMAIL PROTECTED] To: 
  Repeater-Builder@yahoogroups.com Sent: Monday, April 05, 2004 
  5:05 PMSubject: Re: [Repeater-Builder] maxar 80 5 
  wattHi RussThese radio do not have a cos out but I have one 
  that I have moded for our club's 440 repeater. I will send you the info 
  but it won't be today just start my night shift. Will try to get it to you 
  tomorrow.
  RandyRandy Elliott VE3JPUTechnical 
  DirectorSouth Pickering Amateur Radio Club Inc.Box 
  53Pickering, Ontario, CanadaL1V 2R2From: "Russell 
  Filling" [EMAIL PROTECTED]
  Reply-To: 
Repeater-Builder@yahoogroups.comDate: Mon, 5 Apr 2004 
13:53:58 -0400To: Repeater-Builder@yahoogroups.com, 
[EMAIL PROTECTED]Subject: [Repeater-Builder] 
maxar 80 5 watt
  i plan on using a pair 
of maxar 80 5 watt uhf crystaled radios 
as a portable repeater , we have a 
phelps dodge flat pack 50 watt max duplexer 
and , a Workingman UVS 300 11.3 dbi 
antenna ,and an ICS- basic 9 controller , 
so what i need to know is what are the pin outs on the back 
of the maxars ,this is the info off the sticker 
onthe heat sink for the radio Fcc TX Data :cc4319fcc rx data 
rc0206serial: 475fnc0482model :d04tsa3000bk"maxar 80" 
motorola incit 
has 2 14 ga female pins for power 
, 13.8 vdcthen , 15 18 ga female pins 
,ineed a basic 
pin assignment and hopefully the 
radio has a COS out .RussN3TIH

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Re: [Repeater-Builder] Hamtronics exciter

[Steve Grantham]

Well... Does anyone think it would be feasible or practical to modify 
the TA-51 to implement an LC phase modulator? Just how easy or how 
difficult might that be?

Steve

  - Original Message - 
  From: 
  Kevin Custer 
  
  To: Repeater-Builder@yahoogroups.com 
  
  Sent: Tuesday, April 13, 2004 9:46 
  PM
  Subject: Re: [Repeater-Builder] 
  Hamtronics exciter
  [EMAIL PROTECTED] wrote:
  

Hi Kevin,





Virgil mentioned thathe had looked at the 
manual and noted that the TA-51 uses RC phase modulation. A-ha! The light 
went on. You can only get 90 degrees of phase shift max with an RC 
circuit.Had they used an LC phase modulator, they would have gotten 
180 degrees max. That's why the deviation is low with that unit. They don't 
have much deviationto start with, and as you say, if it 
isn'tmultiplieda lot, it'llbe low at the final 
freq.Tell Virgil thanks for the 
  investigation. Also as a side note from practical experience with this 
  type of exciter, and as you have mentioned before as well, the tuning of the 
  first stages after the oscillator are critical for good modulation, otherwise 
  it will be very distorted.Kevin













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Re: [Repeater-Builder] maxar 80 5 watt

[janran]

Hi Russ
I'm at work right now . When I get home I will scan the schematic again and 
send it off to you. You also need the COS location ,am I right??
Randy
Quoting Russell Filling [EMAIL PROTECTED]:

 Re: [Repeater-Builder] maxar 80 5 wattany  news  yet  randy  ?
 Russ
 N3TIH
 
   - Original Message - 
   From: Randy Elliott 
   To: Repeater-Builder@yahoogroups.com 
   Sent: Friday, April 09, 2004 10:39 AM
   Subject: Re: [Repeater-Builder] maxar 80 5 watt
 
 
   Hi Russ
   I scanned the schematic and sent it to your PM but it came back
 undelivered. Give me a couple of days, it's good Friday up here so we are
 doing the family visiting thing.
 
   Randy
 
 
 From: Russell Filling [EMAIL PROTECTED]
 Reply-To: Repeater-Builder@yahoogroups.com
 Date: Thu, 8 Apr 2004 22:16:00 -0400
 To: Repeater-Builder@yahoogroups.com
 Subject: Re: [Repeater-Builder] maxar 80 5 watt
 
 
 
 
 Randy  did  you  find that file yet  ??
 
 Russ
 N3TIH
 
 
   - Original Message - 
   From: Randy Elliott mailto:[EMAIL PROTECTED]  
   To: Repeater-Builder@yahoogroups.com 
   Sent: Monday, April 05, 2004 5:05 PM
   Subject: Re: [Repeater-Builder] maxar 80 5 watt
 
   Hi Russ
   These radio do not have a cos out but I have one that I have moded for
 our club's 440 repeater. I will send you the info but it won't be today just
 start my night shift. Will try to get it to you tomorrow.
 
 
 Randy
 
 
   Randy Elliott VE3JPU
   Technical Director
   South Pickering Amateur Radio Club Inc.
   Box 53
   Pickering, Ontario, Canada
   L1V 2R2
   From: Russell Filling [EMAIL PROTECTED]
 
 Reply-To: Repeater-Builder@yahoogroups.com
 Date: Mon, 5 Apr 2004 13:53:58 -0400
 To: Repeater-Builder@yahoogroups.com, [EMAIL PROTECTED]
 Subject: [Repeater-Builder] maxar 80 5 watt
 
 
 
 
 i plan on using  a pair  of   maxar 80 5 watt  uhf  crystaled radios 
 as a portable   repeater ,  we  have a  phelps dodge  flat pack  50 watt max 
 duplexer  and , a  Workingman UVS 300  11.3 dbi   antenna  ,and an ICS- basic
 9  controller  ,  so what i need to know is  what are the pin outs on the
 back of the  maxars  ,
 this is the  info off the sticker  onthe heat sink  for the radio 
 
 Fcc TX  Data :cc4319
 fcc rx data rc0206
 serial: 475fnc0482
 model :d04tsa3000bk
 maxar 80 motorola inc
 
 it  has  2 14 ga  female  pins for   power  , 13.8 vdc
 then , 15  18 ga  female  pins ,
 
 ineed a  basic  pin assignment   and   hopefully  the  radio has a 
 COS  out .
 
 Russ
 N3TIH
 
 
 
 
 
 
 
 
 
 
 
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Re: [Repeater-Builder] maxar 80 5 watt

[Admin]

i need a  pinout  of the rear connector as i  have 2  of these  going  for
repeter  usage  , and also Randy had  mentioned  he has  a COS  circuit
schematic   for these.

ive  tried the batlabs web site , very informative  for  maxar 50's and moxy
radios , but  nothing  on the  maxar 80 ..
soo im searching for COS and Pinouts   of these radios

Thanks
Russ
N3TIH
- Original Message -
From: Neil McKie [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Wednesday, April 14, 2004 11:44 AM
Subject: Re: [Repeater-Builder] maxar 80 5 watt



   What is it you are looking for?

   Neil - WA6KLA






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Re: [Repeater-Builder] maxar 80 5 watt

[Admin]

yep randy  , i need schemat and  location and  the  pin outs  on the rear
plug   , thanks again  , the correct  email to send to is  [EMAIL PROTECTED]
, my outlook is going screwy with my  5 accounts again  LOL

Russ
N3TIH
- Original Message -
From: [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Wednesday, April 14, 2004 12:36 PM
Subject: Re: [Repeater-Builder] maxar 80 5 watt


 Hi Russ
 I'm at work right now . When I get home I will scan the schematic again
and
 send it off to you. You also need the COS location ,am I right??
 Randy
 Quoting Russell Filling [EMAIL PROTECTED]:

  Re: [Repeater-Builder] maxar 80 5 wattany  news  yet  randy  ?
  Russ
  N3TIH
 
- Original Message -
From: Randy Elliott
To: Repeater-Builder@yahoogroups.com
Sent: Friday, April 09, 2004 10:39 AM
Subject: Re: [Repeater-Builder] maxar 80 5 watt
 
 
Hi Russ
I scanned the schematic and sent it to your PM but it came back
  undelivered. Give me a couple of days, it's good Friday up here so we
are
  doing the family visiting thing.
 
Randy
 
 
  From: Russell Filling [EMAIL PROTECTED]
  Reply-To: Repeater-Builder@yahoogroups.com
  Date: Thu, 8 Apr 2004 22:16:00 -0400
  To: Repeater-Builder@yahoogroups.com
  Subject: Re: [Repeater-Builder] maxar 80 5 watt
 
 
 
 
  Randy  did  you  find that file yet  ??
 
  Russ
  N3TIH
 
 
- Original Message -
From: Randy Elliott mailto:[EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Monday, April 05, 2004 5:05 PM
Subject: Re: [Repeater-Builder] maxar 80 5 watt
 
Hi Russ
These radio do not have a cos out but I have one that I have moded
for
  our club's 440 repeater. I will send you the info but it won't be today
just
  start my night shift. Will try to get it to you tomorrow.
 
 
  Randy
 
 
Randy Elliott VE3JPU
Technical Director
South Pickering Amateur Radio Club Inc.
Box 53
Pickering, Ontario, Canada
L1V 2R2
From: Russell Filling [EMAIL PROTECTED]
 
  Reply-To: Repeater-Builder@yahoogroups.com
  Date: Mon, 5 Apr 2004 13:53:58 -0400
  To: Repeater-Builder@yahoogroups.com,
[EMAIL PROTECTED]
  Subject: [Repeater-Builder] maxar 80 5 watt
 
 
 
 
  i plan on using  a pair  of   maxar 80 5 watt  uhf  crystaled
radios
  as a portable   repeater ,  we  have a  phelps dodge  flat pack  50 watt
max
  duplexer  and , a  Workingman UVS 300  11.3 dbi   antenna  ,and an ICS-
basic
  9  controller  ,  so what i need to know is  what are the pin outs on
the
  back of the  maxars  ,
  this is the  info off the sticker  onthe heat sink  for the
radio
 
  Fcc TX  Data :cc4319
  fcc rx data rc0206
  serial: 475fnc0482
  model :d04tsa3000bk
  maxar 80 motorola inc
 
  it  has  2 14 ga  female  pins for   power  , 13.8 vdc
  then , 15  18 ga  female  pins ,
 
  ineed a  basic  pin assignment   and   hopefully  the  radio has
a
  COS  out .
 
  Russ
  N3TIH
 
 
 
 
 
 
 
 
  
 
 
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b.. http://groups.yahoo.com/group/Repeater-Builder/
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Re: [Repeater-Builder] maxar 80 5 watt

[Admin]

ya  know what  i forgot something important ,   what  my roomate and  i did
is  order 1 set of crystals ,  to tx rock in 1 radio and 1 rx rock in the
other , what  i also need  is the  filter tune  procedure , for the radios
, and   what rock goes where , i see that   in the  crystal sockets  , 1
resistor  is  bare and the  other  has a sleeve  , whats  tx  and whats rx ,
i would assume tx would be the  bare resistor  for  a  psudo crystal oven ,
tem stable ,and  rx  is open  crystal its self  , or am i off base with this
whole idea 

Russ
N3TIH
- Original Message -
From: Neil McKie [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Wednesday, April 14, 2004 11:44 AM
Subject: Re: [Repeater-Builder] maxar 80 5 watt



   What is it you are looking for?

   Neil - WA6KLA






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Re: [Repeater-Builder] maxar 80 5 watt

[Jim B.]

Admin wrote:

 i need a  pinout  of the rear connector as i  have 2  of these  going  for
 repeter  usage  , and also Randy had  mentioned  he has  a COS  circuit
 schematic   for these.
 
 ive  tried the batlabs web site , very informative  for  maxar 50's and moxy
 radios , but  nothing  on the  maxar 80 ..
 soo im searching for COS and Pinouts   of these radios
 
 Thanks
 Russ
 N3TIH

FWIW-Moxy, Maxar, and Maxar 80 are all nearly identical. The differences 
relate to extra filtering on the front end and LO chain, and some in the 
tx (oh, and cost). There were two basic power ranges, and each had a 
different power connector. The low power radios had a rectangular molex, 
with all pins the same size. The high power, and I think all M-80's, had 
a larger plug, with two large pins at the top, and the rest the same 
size as the low power.
The Maxar 50 was a completely different radio, smaller than the rest, 
and shared nothing with the others, except maybe xtals.
-- 
Jim Barbour
WD8CHL





 
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[Repeater-Builder] dual polarisation uhf repeater antenna

[bradley glen]

In th the process of making my tests on a dual
polaarisation antenna for my uhf repeater (one of
many).

I am persueing something that I should have done a
long time ago.I have had reasonable success with
opting for a site that needed 270deg coverage which
made what I have done within reason.

I have taken a standard commercial 4-stack-removed the
top dipole-replaced it with a 6dB collinear for the
vertical polarisation.

The remaining three folded dipoles I have place in the
horizontal pane at 0-90-180.(still experimenting with
the spacing)

The idea and theory is to reduce the deep nulls in
mobile and portable comms.

I would like to hear from anyone that has any comments
and experience in doing this-suely I can not be the
first to do so.

I have a keen interest in dual pol antenna arrays so
if you have any articles I would appreciate the
sitesand your comments.

Regards

Brad   Node : 8300




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Re: [Repeater-Builder] Controller identification ?

[Dave Dawson]

Hi Charles, Any joy ? Cheers Dave UZN

Charles Miller [EMAIL PROTECTED] wrote:
Dave,Looked in my Centracom books and could not find anything on this board. Iwill look in my books at work and see what I can find.Charles MillerWD5EEHSr. ET - City of Dallas - Communications- Original Message - From: "Dave Dawson" <[EMAIL PROTECTED]>To: Sent: Monday, April 12, 2004 4:57 AMSubject: [Repeater-Builder] Controller identification ? Hi All, Can anyone please give me any info on the attached logic boardplease i.e. pinouts and any other gems ? Any help appreciated...Cheers Dave UZN - Yahoo! Messenger - Communicate instantly..."Ping" your friends today!Download Messenger
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today! Download Messenger Now













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Re: [Repeater-Builder] Hamtronics exciter

[scomind]

Hi Steve,


Does anyone think it would be feasible or practical to modify the TA-51 to implement an LC phase modulator? Just how easy or how difficult might that be?


You coulduse a varicap, a tunable inductor, and a capacitor to build acircuit that'sresonant at the crystal frequency, and that's fairly easy. But such a circuit also generates an AM component that must be removed, so another transistor stage isneeded for isolation. That probably meansyou're up to a little perf-board ('blob') addition to the exciter.

BTW, we think that the GE PM exciter suffers from a little of the sameinsufficient isolation problem, but that's another rainy-day investigation.


Incidentally,the RCversion of a phase modulatoris sometimes calledareactance modulator,andthe LC version is called atuned circuit modulator.

73,
Bob, WA9FBO













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[Repeater-Builder] TKR-850 - Where to get CTCSS enable signal?

[jfrohoff]

In the course of connecting my new TKR-850 to my Arcom RC210 
controller I found out that the repeater's Squelch Control ouput is 
not actually a CTCSS squelch signal, it is a COS signal only. In 
other words, the SC pin goes from 5v to 0v whenever ANY signal is 
on the receiver channel, whether or not it has the right CTCSS with 
it. The CTCSS is enabled for the channel in the programming (173.8), 
but it only cuts off the audio. The CTCSS enable is not reflected on 
the repeater's SC pin. When I change to the wrong CTCSS code on my 
handheld, the receiver speaker is quiet, and no audio gets to the 
controller, but the busy light on the front lights and the SC pin 
goes to 0v.

I cannot see any other output pin for CTCSS enable ... so my option 
appears to be either to use an external CTCSS decoder or to find a 
signal in the receiver that does reflect the true CTCSS enable state.

Anyone deal with this issue on a TKR-850?

Thanks! Jim K7RNR






 
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[Repeater-Builder] Re: Infomation Needed

[Bob]

i belive it about a 30 inch cabnet


--- In Repeater-Builder@yahoogroups.com, Neil McKie [EMAIL PROTECTED] 
wrote:
 
   What is the height (in inches) of the cabinet? 
 
   Neil 
 
 
 Bob N2BR wrote:
  
  dont know about card yet waiteing on key to cabnet so
  i can look more into it
  --- Neil McKie [EMAIL PROTECTED] wrote:
  
 C - Compa cabinet - either 30 or 41 high
 7 - 110 Watts out - Intermittent duty
 3 - 136 - 174 MHz range
 R - R Series (Micor) Receiver
 T - T Series (Micor) Transmitter
 B - Base or repeater depending on the config from
   the factory
 3 - CTCSS - Private Line operation
 1 - Narrow band - +/- 5 kHz deviation
 0 - factory 1 freq transmit / 1 freq receive
 3 - ??
 C - C Series of manufacture
 M - May have come with a microphone as a base
   station.
  
 What plug-in cards are on the control shelf?
  
 Neil  - WA6KLA
  
  
   Bob wrote:
   
I have a Micor or Mitrek Repeater or what i think
   is a repeater.Here
the Model number can anyone tell me what it is
   
Model Number C73RTB/3103CM
   
Bobby/N2BR
   
   
  
  
  
  
  
  
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RE: [Repeater-Builder] Hamtronics exciter

[Gregg Lengling]

I've done the FM PL mods to this type of
transmitter to get direct FM for CTCSS injection. The modulator on that
exciter will not handle CTCSS so the mod is required for a nice clean PL. It's
a rather simple mod with only a few parts and is documented on the RepeaterBuilder
website.







Gregg R. Lengling, W9DHI, Retired
Administrator http://www.milwaukeehdtv.org
K2/100 S#3075 KX1 S# 57
Politics is the art of appearing candid and completely open, while concealing
as much as possible. -States: The Bene Gesserit View





-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] 
Sent: Wednesday, April 14, 2004
2:05 PM
To:
Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder]
Hamtronics exciter







Hi Steve,

















Does anyone think it would be
feasible or practical to modify the TA-51 to implement an LC phase
modulator? Just how easy or how difficult might that be?



















You coulduse a varicap, a
tunable inductor, and a capacitor to build acircuit that'sresonant
at the crystal frequency, and that's fairly easy. But such a circuit also
generates an AM component that must be removed, so another transistor stage
isneeded for isolation. That probably meansyou're up to a little
perf-board ('blob') addition to the exciter.











BTW, we think that the GE PM exciter
suffers from a little of the sameinsufficient isolation problem, but
that's another rainy-day investigation.













Incidentally,the
RCversion of a phase modulatoris sometimes
calledareactance modulator,andthe LC version is called
atuned circuit modulator.











73,





Bob, WA9FBO





























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RE: [Repeater-Builder] TKR-850 - Where to get CTCSS enable signal?

[Gregg Lengling]

You need to program one of the programmable outputs to TOR (this is a logic
signal that goes active with received signal and proper tone).


Gregg R. Lengling, W9DHI, Retired
Administrator http://www.milwaukeehdtv.org
K2/100 S#3075 KX1 S# 57
Politics is the art of appearing candid and completely open, while
concealing as much as possible.   -States: The Bene Gesserit View
 


-Original Message-
From: jfrohoff [mailto:[EMAIL PROTECTED] 
Sent: Wednesday, April 14, 2004 1:50 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] TKR-850 - Where to get CTCSS enable signal?

In the course of connecting my new TKR-850 to my Arcom RC210 
controller I found out that the repeater's Squelch Control ouput is 
not actually a CTCSS squelch signal, it is a COS signal only. In 
other words, the SC pin goes from 5v to 0v whenever ANY signal is 
on the receiver channel, whether or not it has the right CTCSS with 
it. The CTCSS is enabled for the channel in the programming (173.8), 
but it only cuts off the audio. The CTCSS enable is not reflected on 
the repeater's SC pin. When I change to the wrong CTCSS code on my 
handheld, the receiver speaker is quiet, and no audio gets to the 
controller, but the busy light on the front lights and the SC pin 
goes to 0v.

I cannot see any other output pin for CTCSS enable ... so my option 
appears to be either to use an external CTCSS decoder or to find a 
signal in the receiver that does reflect the true CTCSS enable state.

Anyone deal with this issue on a TKR-850?

Thanks! Jim K7RNR






 
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Re: [Repeater-Builder] Controller identification ?

[Jim B.]

Dave Dawson wrote:

 Hi Charles, Any joy ?Cheers Dave UZN
  
 
 
 Charles Miller [EMAIL PROTECTED] wrote:
 Dave,
 
 Looked in my Centracom books and could not find anything on this board. I
 will look in my books at work and see what I can find.
 
 Charles Miller
 WD5EEH
 Sr. ET - City of Dallas - Communications
 

It's not Motorola-you won't find anything there. It's Centra-Com, not 
Centracom.
Someone said they were a british company, and probably still exist.
-- 
Jim Barbour
WD8CHL





 
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RE: [Repeater-Builder] TKR-850 - Where to get CTCSS enable signal?

[Ken Arck]

At 02:29 PM 4/14/2004 -0500, you wrote:
You need to program one of the programmable outputs to TOR (this is a logic
signal that goes active with received signal and proper tone).

---Is there a programming option that would give him a discrete PL decode
logic output, independent of COS? That is what he needs.

Ken
--
President and CTO - Arcom Communications
Makers of state-of-the-art repeater controllers and accessories.
http://www.ah6le.net/arcom/index.html
AH6LE/R - IRLP Node 3000
http://www.irlp.net




 
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Re: [Repeater-Builder] TKR-850 - Where to get CTCSS enable signal?

[Jim B.]

jfrohoff wrote:

 In the course of connecting my new TKR-850 to my Arcom RC210 
 controller I found out that the repeater's Squelch Control ouput is 
 not actually a CTCSS squelch signal, it is a COS signal only. In 
 other words, the SC pin goes from 5v to 0v whenever ANY signal is 
 on the receiver channel, whether or not it has the right CTCSS with 
 it. The CTCSS is enabled for the channel in the programming (173.8), 
 but it only cuts off the audio. The CTCSS enable is not reflected on 
 the repeater's SC pin. When I change to the wrong CTCSS code on my 
 handheld, the receiver speaker is quiet, and no audio gets to the 
 controller, but the busy light on the front lights and the SC pin 
 goes to 0v.
 
 I cannot see any other output pin for CTCSS enable ... so my option 
 appears to be either to use an external CTCSS decoder or to find a 
 signal in the receiver that does reflect the true CTCSS enable state.
 
 Anyone deal with this issue on a TKR-850?
 
 Thanks! Jim K7RNR
 

Do you have a manual? If not, get one.

-- 
Jim Barbour
WD8CHL





 
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[Repeater-Builder] DTMF decoder

[Tedd Doda]

I just repaired a really neat control system for a
company that used a DTMF decoder for controlling
a remote piece of equipment.

I was hoping that someone has heard of the manufacturer
of the decoder, as the unit is very small and has 8
NO or NC relay contact sets. The companies name is
IKA Electronics and the board was made in Canada.

I can just think of the possibilities :)



Tedd Doda, VE3TJD

Lazer Audio and Electronics
Baden, Ontario, Canada







 
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Re: [Repeater-Builder] TKR-850 - Where to get CTCSS enable signal?

[russ]

It  tells you in the program book how to ID the pin.
Its all software.
Good luck!
Russ


- Original Message - 
From: jfrohoff [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Wednesday, April 14, 2004 2:50 PM
Subject: [Repeater-Builder] TKR-850 - Where to get CTCSS enable signal?


 In the course of connecting my new TKR-850 to my Arcom RC210 
 controller I found out that the repeater's Squelch Control ouput is 
 not actually a CTCSS squelch signal, it is a COS signal only. In 
 other words, the SC pin goes from 5v to 0v whenever ANY signal is 
 on the receiver channel, whether or not it has the right CTCSS with 
 it. The CTCSS is enabled for the channel in the programming (173.8), 
 but it only cuts off the audio. The CTCSS enable is not reflected on 
 the repeater's SC pin. When I change to the wrong CTCSS code on my 
 handheld, the receiver speaker is quiet, and no audio gets to the 
 controller, but the busy light on the front lights and the SC pin 
 goes to 0v.
 
 I cannot see any other output pin for CTCSS enable ... so my option 
 appears to be either to use an external CTCSS decoder or to find a 
 signal in the receiver that does reflect the true CTCSS enable state.
 
 Anyone deal with this issue on a TKR-850?
 
 Thanks! Jim K7RNR
 
 
 
 
 
 
  
 Yahoo! Groups Links
 
 
 
  
 
 




 
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Re: [Repeater-Builder] Hamtronics exciter

[Kevin Custer]

Hi Steve,

I have had good results FM'ing the TA-51 and TA-451. See here:
http://www.repeater-builder.com/rbtip/ta-51pl_mod.html

While this mod was only intended for FM'ing the crystal to get adequate
PL deviation with low distortion, I have recently redone my remote
receiver projects for one of my 2 meter machines (4 sites). I used the
modification as above for voice frequencies as well as PL, the
difference from the stock modulator was amazing. While the linearity
of the modulator 'as designed' is of no concern when only one frequency
is applied (like a PL tone) I was surprised to measure quite acceptable
response across the entire range from about 10 cycles to about 5500
cycles. Even though the PM modulator in the UHF exciter shows better
response because it's multiplied several more times then on low-band or
high-band, FM'ing it made it sound so much better.  Obviously, a
clipper and low pass filter should be implemented when using any
modulator capable of deviating beyond the acceptable bandwidth of the
particular service/frequency spectrum.

Kevin Custer

Steve Grantham wrote:

  
  
  
  
  Well... Does anyone think it would be feasible or practical to
modify the TA-51 to implement an LC phase modulator? Just how easy or
how difficult might that be?
  
  Steve
  
-
Original Message - 
From:
Kevin
Custer 
To:
Repeater-Builder@yahoogroups.com

Sent:
Tuesday, April 13, 2004 9:46 PM
Subject:
Re: [Repeater-Builder] Hamtronics exciter


[EMAIL PROTECTED]
wrote:

  
  Hi Kevin,
  
  
  
  
  
  
  Virgil mentioned thathe had looked at the
manual and noted that the TA-51 uses RC phase modulation. A-ha! The
light went on. You can only get 90 degrees of phase shift max with an
RC circuit.Had they used an LC phase modulator, they would have gotten
180 degrees max. That's why the deviation is low with that unit. They
don't have much deviationto start with, and as you say, if it
isn'tmultiplieda lot, it'llbe low at the final freq.
  


Tell Virgil thanks for the investigation. Also as a side note from
practical experience with this type of exciter, and as you have
mentioned before as well, the tuning of the first stages after the
oscillator are critical for good modulation, otherwise it will be very
distorted.

Kevin
  















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Re: [Repeater-Builder] Hamtronics exciter

[Steve Grantham]

Thanks Bob  Greg! As one might imagine, 
I really need one more project to do around here ;)
I had looked at the mod Kevin posted, and even 
looked for the parts, but none were readily available.
After that, I started giving serious thought to a 
wholesale change out to MASTR II radio gear...
I am getting my M2 stuff together, but I'll still 
be left with the Hamtronics stuff with the crystals.
Thanks for the tips!

73,
Steve


  - Original Message - 
  From: 
  Gregg 
  Lengling 
  To: Repeater-Builder@yahoogroups.com 
  
  Sent: Wednesday, April 14, 2004 2:30 
  PM
  Subject: RE: [Repeater-Builder] 
  Hamtronics exciter
  
  
  
  I've done the 
  FM 
  PL mods to this type of 
  transmitter to get direct FM for CTCSS injection. The modulator on that 
  exciter will not handle CTCSS so the mod is required for a nice clean PL. 
  It's a rather simple mod with only a few parts and is documented on the 
  RepeaterBuilder website.
  
  
  
  Gregg R. Lengling, W9DHI, 
  RetiredAdministrator http://www.milwaukeehdtv.orgK2/100 
  S#3075 KX1 S# 57Politics is the art of appearing candid and completely 
  open, while concealing as much as possible. -States: The Bene 
  Gesserit View
  -Original 
  Message-From: 
  [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Wednesday, April 14, 2004 2:05 
  PMTo: 
  Repeater-Builder@yahoogroups.comSubject: Re: [Repeater-Builder] 
  Hamtronics exciter
  
  
  
  Hi Steve,
  
  
  
  
  
Does anyone think it would be 
feasible or practical to modify the TA-51 to implement an LC phase 
modulator? Just how easy or how difficult might that 
be?
  
  
  
  
  
  You coulduse a varicap, a 
  tunable inductor, and a capacitor to build acircuit that'sresonant 
  at the crystal frequency, and that's fairly easy. But such a circuit also 
  generates an AM component that must be removed, so another transistor stage 
  isneeded for isolation. That probably meansyou're up to a little 
  perf-board ('blob') addition to the exciter.
  
  
  
  BTW, we think that the GE PM 
  exciter suffers from a little of the sameinsufficient isolation problem, 
  but that's another rainy-day investigation.
  
  
  
  
  Incidentally,the 
  RCversion of a phase modulatoris sometimes 
  calledareactance modulator,andthe LC version is called 
  atuned circuit modulator.
  
  
  
  73,
  
  Bob, 
  WA9FBO
  













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[Repeater-Builder] TKR-820 - Adding an External Controller..

[Steve Grantham]

Does anyone have the pin-outs for the accessory jack on the TKR-820 for
adding an external controller?  Any hookup tips?

Thanks!
Steve






 
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Re: [Repeater-Builder] Hamtronics exciter

[Steve Grantham]

Sounds interesting! Maybe I can experiment 
with this too...

73,
Steve

  - Original Message - 
  From: 
  Kevin Custer 
  
  To: Repeater-Builder@yahoogroups.com 
  
  Sent: Wednesday, April 14, 2004 3:42 
  PM
  Subject: Re: [Repeater-Builder] 
  Hamtronics exciter
  Hi Steve,I have had good results FM'ing the TA-51 and 
  TA-451. See here:http://www.repeater-builder.com/rbtip/ta-51pl_mod.htmlWhile 
  this mod was only intended for FM'ing the crystal to get adequate PL deviation 
  with low distortion, I have recently redone my remote receiver projects for 
  one of my 2 meter machines (4 sites). I used the modification as above 
  for voice frequencies as well as PL, the difference from the stock modulator 
  was amazing. While the linearity of the modulator 'as designed' is of no 
  concern when only one frequency is applied (like a PL tone) I was surprised to 
  measure quite acceptable response across the entire range from about 10 cycles 
  to about 5500 cycles. Even though the PM modulator in the UHF exciter 
  shows better response because it's multiplied several more times then on 
  low-band or high-band, FM'ing it made it sound so much better.  
  Obviously, a clipper and low pass filter should be implemented when using any 
  modulator capable of deviating beyond the acceptable bandwidth of the 
  particular service/frequency spectrum.Kevin CusterSteve 
  Grantham wrote:
  



Well... Does anyone think it would be feasible or practical to 
modify the TA-51 to implement an LC phase modulator? Just how easy or 
how difficult might that be?

Steve

  - 
  Original Message - 
  From: 
  Kevin 
  Custer 
  To: 
  Repeater-Builder@yahoogroups.com 
  
  Sent: 
  Tuesday, April 13, 2004 9:46 PM
  Subject: 
  Re: [Repeater-Builder] Hamtronics exciter
  [EMAIL PROTECTED] wrote:
  

Hi Kevin,





Virgil mentioned thathe had looked at 
the manual and noted that the TA-51 uses RC phase modulation. A-ha! The 
light went on. You can only get 90 degrees of phase shift max with an RC 
circuit.Had they used an LC phase modulator, they would have 
gotten 180 degrees max. That's why the deviation is low with that unit. 
They don't have much deviationto start with, and as you say, if it 
isn'tmultiplieda lot, it'llbe low at the final 
freq.Tell Virgil thanks for the 
  investigation. Also as a side note from practical experience with 
  this type of exciter, and as you have mentioned before as well, the tuning 
  of the first stages after the oscillator are critical for good modulation, 
  otherwise it will be very distorted.Kevin 
  













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[Repeater-Builder] Spring Cleaning

[Adi Linden]

I am doing some spring cleaning. Now that my repeater is up and running I 
can get rid of some of the extra gear I accumulated just in case I blew 
things up :) I've listed the stuff on ebay...

Midland 70-115B HT VHF Handheld 2 Watt
http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItemcategory=4674item=3091419191

Motorola Syntor T43SRA3000BK 40Watt
http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItemitem=3809654853category=4669

Motorola Mitrek T83JJA3900DK 110 Watt
http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItemcategory=4669item=3809658609

Systcoms VTR74 VHF Transceiver 20 Watt
http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItemcategory=4674item=3091564798

Motorola Mocom CU33BBA-1000A VHF Radio 30 Watt
http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItemcategory=40068item=3091565289

Adi
-- 
   Adi Linden  |  va3adi  |  [EMAIL PROTECTED]  |  http://adis.ca
+-+
IRLP Node 2590 in Sioux Lookout, Ontario





 
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