[Repeater-Builder] Repeater receiver testing

[tahrens301]

I have this lowband Micor receiver
that I want to test for adjacent channel
rejection.

I have two calibrated signal generators
and a calibrated spectrum analyzer if
I need it.

How can i measure the rejection of the
off channel signal?
 
Thanks,

Tim

Re: [Repeater-Builder] ref: Spectrum Comm ST-250 and SCT-1500 900mhz

[x.tait.tech]

i have found large files easier to send via

http://www.yousendit.com


Marcus


On Sun, Jul 25, 2010 at 7:10 AM, W9FS-Jerry wrote:

>
>
> I have found I can't send them, comcast says they are too big.
>
> "Plan B" click on links or copy/paste into browser
>
>
> www.w9fs.com/ST-250.pdf
>
>
> www.w9fs.com/SCT-1500.pdf
>
>
> Good luck, these are long files, not too bad if you have a fast connection.
>
> 73,
>
> Jerry W9FS
>  
>

[Repeater-Builder] Re: Low Band Syntor X9000

[Bill]

jawjabillatl  at   bellsouth  dot  net   I sent you an email--- some arrive --- 
some don't
bill
.
.

--- In Repeater-Builder@yahoogroups.com, "JOHN MACKEY"  wrote:
>
> Is there anyone in the group who is familar with Low band Syntor X 9000
> radios?
> I would like to go off line in e-mail to ask a few questions.
> 
> jmac...@...
> 
> thanks
>

[Repeater-Builder] Re: NSN 6054A 12W speaker schematic ?

[hitekgearhead]

Thanks, that was it.

And you know what. Now that I see it, I do recall reading about that power 
op-amp in one of my Forest Mimms books years ago.

Also it is interesting in that they used a 2W driver in a bridged configuration 
to drive a transistor amp. I guess higher power op-amps were not available at 
the time, and using the one op-amp helped reduce the transistor count.

Thanks a lot!!!

Albert

--- In Repeater-Builder@yahoogroups.com, DCFluX  wrote:
>
> Err. LM-1877
> 
> On Fri, Jul 23, 2010 at 1:35 PM, DCFluX  wrote:
> > Oops, didn't realize it was the stereo version, Try LM1887.
> >
> > On Fri, Jul 23, 2010 at 1:28 PM, DCFluX  wrote:
> >> Just by your description of the pins, I would suggest you look at the
> >> LM-380, 2.5W amplifier.  They are tied together as they act as the
> >> chips heatsink.
> >>
> >> On Fri, Jul 23, 2010 at 1:19 PM, hitekgearhead
> >>  wrote:
> >>> Hey Guys. I was looking at the schematic for the above mentioned speaker 
> >>> (thank you repeater builder site) and I had a few questions.
> >>>
> >>> First, does anyone know where to find a replacement for the 5184320A99 
> >>> dual op-amp labeled U1?
> >>>
> >>> Secondly, Is this op-amp basically being used as a buffer, preamp, and 
> >>> inverter?
> >>>
> >>> Thirdly, what on earth are pins 3, 4, 5 and pins 10, 11, 12 doing? I have 
> >>> never seen so many pins on an op-amp tied together.
> >>>
> >>> Thanks!
> >>> Albert
> >>>
> >>>
> >>>
> >>>
> >>>
> >>> 
> >>>
> >>>
> >>>
> >>> Yahoo! Groups Links
> >>>
> >>>
> >>>
> >>>
> >>
> >
>

Re: [Repeater-Builder] RE: [GE Mastr II] Help ID 19C321936G2

[men...@pa.net]

Taking a bit of a guess, since the board appears to be some sort of  
encoder or decoder for audio,I would suspect that it could be used as  
a single tone burst encoder or decoder.  The CG module position would  
have provisions for PTT and audio out as well as disc. audio in and  
squelch disable.

Milt
N3LTQ


Quoting Eric Lemmon :

> Corey,
>
> That device is definitely for a Mastr II radio, and it definitely plugs into
> the same place as a Channel Guard module.  However, I cannot find any
> reference to that module in the RBTIP GE files.
>
> Curiously, Dale K0JXI, posted an identical request for info on the same
> board, five years ago:
> 
>
> 73, Eric Lemmon WB6FLY
>
>
> -Original Message-
> From: ge-mast...@yahoogroups.com [mailto:ge-mast...@yahoogroups.com] On
> Behalf Of nativeMT
> Sent: Friday, July 23, 2010 3:23 PM
> To: ge-mast...@yahoogroups.com
> Subject: Re: [GE Mastr II] Help ID 19C321936G2
>
>
>
> Eric,
> Here are links to the front and back of the board.
>
> http://kc7mrq.home.bresnan.net/pics/front.jpg
>
> http://kc7mrq.home.bresnan.net/pics/back.jpg
>
> Have a great day,
>
> Corey
>
> --- In ge-mast...@yahoogroups.com  ,
> "Eric Lemmon"  wrote:
>>
>> Corey,
>>
>> I'm not surprised, because 19C321936G2 is not a valid module or component
>> number. My complete GE microfiche file leaps from 19C321931 to 19C321954.
>> Is this number stamped in black ink along one edge of the board? If not,
> it
>> may be for a hardware item such as the bare PC board or a bracket. Please
>> describe what model radio this board is in, and what connections go to and
>> from it. A picture would be great.
>>
>> 73, Eric Lemmon WB6FLY
>>
>>
>> -Original Message-
>> From: ge-mast...@yahoogroups.com 
> [mailto:ge-mast...@yahoogroups.com  ]
> On
>> Behalf Of nativeMT
>> Sent: Wednesday, July 21, 2010 7:56 PM
>> To: ge-mast...@yahoogroups.com 
>> Subject: [GE Mastr II] Help ID 19C321936G2
>>
>>
>>
>> Am having a hard time finding any information on this board.
>>
>> Thanks,
>> Corey
>
>
>
> 
>
>
>
> Yahoo! Groups Links
>
>
>
>

[Repeater-Builder] ref: Spectrum Comm ST-250 and SCT-1500 900mhz

[W9FS-Jerry]

I have found I can't send them, comcast says they are too big.

"Plan B" click on links or copy/paste into browser

 
www.w9fs.com/ST-250.pdf 

 
www.w9fs.com/SCT-1500.pdf

 
Good luck, these are long files, not too bad if you have a fast connection.
 
73,
 
Jerry W9FS

RE: [Repeater-Builder] Low Band Syntor X9000

[Eric Lemmon]

John,

One very informative source is the Syntor X9000 group, here:


73, Eric Lemmon WB6FLY
 

-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of JOHN MACKEY
Sent: Friday, July 23, 2010 10:20 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Low Band Syntor X9000

  

Is there anyone in the group who is familar with Low band Syntor X 9000
radios?
I would like to go off line in e-mail to ask a few questions.

jmac...@usa.net  

thanks

[Repeater-Builder] Spectrum Comm ST-250 and SCT-1500 900mhz

[W9FS-Jerry]

Some time back I sold a few of the Spectrum 900mhz paging transmitters, and at 
the time I couldn't find the manual so I sold them without the manual. Guess 
what? I found the manuals! At that time several asked me if I had the manuals, 
now I have them scanned in PDF format. Manuals are complete. If you are 
interested drop me an email. These are big files 6 and 11 mb, if I can I will 
send them by email.

Jerry W9FS
w...@w9fs.com 

Re: [Repeater-Builder] Re: OT: Licensing Exam Info

[Will Gwin]

It kinda sounds like I may be one of the few people that is a VE on here (at 
least that reads regularly).

The last time I checked, the Technician test is about 35 questions out of a 
pool of around 350 questions.  The General test is also 35 with around 400 
questions in the pool, and the Extra class test is 50 questions with a pool of 
around 650 questions.

You can download the full question pools from 

You can take practice tests online at   They 
wrote this flash program so you can take the same test over and over again or 
select a new one.  This allows you to memorize the questions.  If you can ace 
about five of these, you've got around 1/2 of the question pool mastered and 
will likely be able to pass whatever test you were working on.

You will need to take the actual test with three accredited volunteer examiners 
(VEs).  If they are accredited/affiliated with the ARRL the test session will 
cost $15, if they are with W5YI-VEC then it will be $14.  Other groups prices 
will vary.  You are paying for the test session, so unless that group is short 
on time you can keep taking tests as long as you can pass.  If you pass 
Technician it's customary to let you take General.  If you pass General it's 
customary to let you take Extra.

Will Gwin
www.N5KH.org
Will

La Rue Communications wrote:
> 
> 
> Of course. This is purely for a small network that were are working on. 
> Little project - but I will definetely be getting the appropriate 
> licence required for it.
>  
> Thanks for the heads up!
>  
> John Hymes
> La Rue Communications
> 10 S. Aurora Street
> Stockton, CA 95202
> http://tinyurl.com/2dtngmn

[Repeater-Builder] Re: NSN 6054A 12W speaker schematic ?

[hitekgearhead]

Thank you all!!

That was exactly it, the LM-1877!

Actually, now that you mention it, I recall seeing it in my Forest Mimms books 
from Radio Shack years ago.

And Mike, thanks for confirming the details of the circuit operation for me.

Thanks again!

Albert


BTW, I thought I posted a reply earlier this evening but I haven't seen it yet. 
If two messages pop up from me it is because Yahoo is retarded.





--- In Repeater-Builder@yahoogroups.com, Mike Morris  wrote:
>
> At 01:19 PM 07/23/10, you wrote:
> >Hey Guys. I was looking at the schematic for the above mentioned 
> >speaker (thank you repeater builder site) and I had a few questions.
> 
> If anybody's interested it's here:
> 
> 
> >First, does anyone know where to find a replacement for the 
> >5184320A99 dual op-amp labeled U1?
> 
> I'd look in the National Semiconductor products manual
> that covers automotive audio products.
> That schematic resembles what I saw in an early 1980s app
> note for a car stereo receiver.   LM187something.
> 
> >Secondly, Is this op-amp basically being used as a buffer, preamp, 
> >and inverter?
> 
> Both halves are being used strictly as an inverting buffer
> for out-of-phase audio.
> 
> Look carefully at the schematic and remember that
> nothing in the input circuit is ground referenced - the
> audio input (from the radio) is balanced audio (both
> are sides hot, 180 degrees out of phase with each other,
> and there's an implied / virtual audio ground) in the
> middle.
> 
> Each side of the circuitry driving the speaker is a mirror
> image of the other, just like the incoming audio is a
> mirror image compared to the virtual ground.
> 
> >Thirdly, what on earth are pins 3, 4, 5 and pins 10, 11, 12 doing?
> >I have never seen so many pins on an op-amp tied together.
> 
> If that chip is the one I'm thinking of its capable of about 2 watts
> per channel on it's own.  That takes some heat sinking.
> Probably a heat sink for the final transistors inside the opamp.
> And if you look closely, pin 1 is audio ground, and pins 3,4,5,
> 10, 11 and 12 are power ground - and those are switched to
> ground by Q3, which is driven by the squelch circuit in the radio.
> 
> >Thanks!
> >Albert
> 
> Mike WA6ILQ
>