[NHRC-user] NHRC-4/M2 Question

[David Shiplett]

I will try a couple of other experiments to narrow this down. The problem
had been ongoing at the repeater site but was written off as intermod or
some other cause from around the repeater site.

The signal source is a CT-3000B and it may be some noise from it. But that
won't explain it happening at the repeater site. I could see a receiver
problem but not at exact intervals.

I did monitor the TS-32 and cannot see any logic pulse on it each time
happens.

What is way too confusing is the repeatablility of the problem at exactly 4
minute intervals. It is like a timer is doing this.

Will keep looking.

Dave

-----Original Message-----
From: nhrc-user-admin at nhrc.net [mailto:nhrc-user-admin at nhrc.net]On Behalf Of
PETER GAILUNAS
Sent: Thursday, February 28, 2002 10:31 PM
To: nhrc-user at nhrc.net
Subject: RE: [NHRC-user] NHRC-4/M2 Question

Hi,
Pete here from NHRC.

If the Green CAS led will only illuminate if both CAS and PL are
satisfied.  The controller handles this function with simple transistor
logic.
If the green led flickers it is because it is getting a valid signal from
the MASTR-II and the pl decoder.  If the green LED flickers the controller
thinks a signal is present and starts doing it job.
The ID cycle starts and will continue indefinitely if the CAS led keeps
flickering.


It could be a tone decoder problem,  It could be intermod.  It may be
possible that the tone decoder is responding intermittently to some
distortion component of the 1KHZ signal.  It only needs to be for a
fraction of a sec to create a valid CAS and start the cycle.    The
distortion may be due to IF issues.

I don't think it is a controller related problem.

let me know if this helps.


Peter






At 08:16 PM 2/28/2002 -0500, you wrote:
>This sounds like a hardware problem.  Let's see what Pete has to say about
it.
>
>My guess is static discharge.  I could be way off base, but that's my
>first guess.
>
>Regards,
>
>Jeff
>
>At 08:03 PM 2/28/2002, you wrote:
>>NHRC-4/M2...
>>
>>Jeff,
>>
>>I was also wrong about the led that I thought was the RB is actually the
>>main receiver green LED. A couple of other pieces of information. I am
>>applying a continuous signal on the receiver with a 1khz tone. I am using
PL
>>decode only to access the repeater. I have checked the 10 regulator in it
>>appears clean. What has me perplexed is the every 4 minute hit on the main
>>COS and PTT line. Without any corresponding change in the receiver. After
>>the second hit in a couple of minutes the unit ID's and the cycle starts
>>over.
>>
>>Dave
>>
>>Dave
>>
>>-----Original Message-----
>>From: nhrc-user-admin at nhrc.net [mailto:nhrc-user-admin at nhrc.net]On Behalf
Of
>>Jeff Otterson
>>Sent: Thursday, February 28, 2002 5:58 PM
>>To: nhrc-user at nhrc.net
>>Subject: Re: [NHRC-user] NHRC-4/M2 Question
>>
>>Hi David,
>>    Which controller are you referring to?
>>
>>    Jeff Otterson
>>    NHRC LLC
>>
>>At 02:15 PM 2/28/2002, you wrote:
>> >Has anyone had a situation where the NHRC appears to get a reset signal
on
>>a
>> >periodic reoccurring basis. I am experiencing a problem where we seem to
be
>> >getting an ID every 11  12 minutes. Upon watching the unit I see a false
>> >signal setting off the RB PTT and the Main PTT every 3 minutes 55
seconds
>> >give or take a few.
>> >
>> >The unit is being operated in PL mode only using a TS-32 so you would
thing
>> >nothing should false the line to reset the timer for CW ID. You may even
>>get
>> >a courtesy tone at the PTT event but not always.
>> >
>> >Also, what is the difference between rev a and rev b units?
>> >
>> >David L. Shiplett
>> >Warner Robins Operations Manager
>> >LH Network, Inc.
>> >211 Independence Drive
>> >Warner Robins, GA 31088
>> >email: Daves at lhnetwork.com
>> >(478) 971-3281 (V)
>> >(478) 971-3481 (F)
>> >
>>
>>_______________________________________________
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>
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Peter J Gailunas
NHRC Repeater Controllers
WWW.NHRC.NET

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