Re: [Repeater-Builder] carrier drop pulse

2005-07-25 Thread albemarle7 





Jeff,
You are familiar with the repeater that is having 
the pulse COR drop blip at 225 khz down in frequency. I don't want to 
mention any names or callsigns for fear of getting someone upset or angry 
with me.  You and I vaguely know each other. You left your business card 
and a couple ICOM elements on my repeater in Lawrenceville, NJ a couple years 
ago. I may still have it. If so, I will contact you thru that path if you wish. 

Gary  K2UQ
 













  




  
  
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RE: [Repeater-Builder] carrier drop pulse

2005-07-25 Thread no6b 
One problem I saw on a converted Heathkit HW-202 repeater (not a radio I 
recommend - TX OK but RX horrible) was a leaky feedthru cap on the TX box 
that partially pulled PTT low (active).  This would cause the TX to shift 
up several kHz every time the controller's PTT went inactive for a second 
or so before dropping out completely.

Bob NO6B

At 20:15 7/25/2005 -0400, you wrote:
>I'd look at the comp line on the ICOM and see if it's doing anything 
>strange when PTT drops.  You'll probably need a DSO or something similiar 
>to capture it since it's such a short duration.  While you're at it, 
>monitor the 10V line as well.
>
>Is this a converted mobile or a station?
>
> --- Jeff
>
>
>
>Jeff DePolo WN3A - [EMAIL PROTECTED]
>Broadcast and Communications Consultant
>-Original Message-
>From: Repeater-Builder@yahoogroups.com 
>[mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
>Sent: Monday, July 25, 2005 2:05 PM
>To: Repeater-Builder@yahoogroups.com
>Cc: [EMAIL PROTECTED]
>Subject: [Repeater-Builder] carrier drop pulse
>
>Here is one for you guru's and BMOC problem solvers. Must admit there are 
>a lot of good ones in this group.  A 2 meter repeater 15 miles away using 
>a Mastr2 PLL exciter emits a carrier drop pulse of about 500 ms in 
>duration on a frequency 225 khz down from the repeaters xmit freq. 
>Unfortunately this pulse is on the output of another repeater I 
>continuously monitor. The repeater trustee is very knowledgeable and 
>cooperative and is attempting to solve this problem.  He did say the PLL 
>is not quite 5 volts but otherwise seems to work well. The drop pulse on 
>COR is definitely coming from the exciter and can be observed on a SA with 
>PA installed and removed.  It was replaced with another exciter and the 
>second exciter is doing exactly the same thing.
>Gary  K2UQ
>
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Re: [Repeater-Builder] carrier drop pulse

2005-07-25 Thread albemarle7 





Thank you both for the good suggestions.  It isn't my repeater. I 
believe its a base station.
Gary
 













  




  
  
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RE: [Repeater-Builder] carrier drop pulse

2005-07-25 Thread Jeff DePolo WN3A 
Title: Message





I'd look at the comp line on the ICOM and 
see if it's doing anything strange when PTT drops.  You'll probably need a 
DSO or something similiar to capture it since it's such a short duration.  
While you're at it, monitor the 10V line as well.
 
Is this a converted mobile or a 
station?
 
    
--- Jeff
 

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

  
  -Original Message-From: 
  Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] 
  On Behalf Of [EMAIL PROTECTED]Sent: Monday, July 25, 2005 
  2:05 PMTo: Repeater-Builder@yahoogroups.comCc: 
  [EMAIL PROTECTED]Subject: [Repeater-Builder] carrier drop 
  pulse
  Here is one for you guru's and BMOC problem solvers. Must admit there are 
  a lot of good ones in this group.  A 2 meter repeater 15 miles away using 
  a Mastr2 PLL exciter emits a carrier drop pulse of about 500 ms in 
  duration on a frequency 225 khz down from the repeaters xmit freq. 
  Unfortunately this pulse is on the output of another repeater I continuously 
  monitor. The repeater trustee is very knowledgeable and cooperative and is 
  attempting to solve this problem.  He did say the PLL is not quite 5 
  volts but otherwise seems to work well. The drop pulse on 
  COR is definitely coming from the exciter and can be observed on a SA 
  with PA installed and removed.  It was replaced with another exciter 
  and the second exciter is doing exactly the same thing. 
  Gary  K2UQ
   
  --No virus found in this incoming message.Checked by AVG 
  Anti-Virus.Version: 7.0.338 / Virus Database: 267.9.4/57 - Release Date: 
  7/22/2005













  




  
  
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Re: [Repeater-Builder] carrier drop pulse

2005-07-25 Thread Kris Kirby 
On Mon, 25 Jul 2005 [EMAIL PROTECTED] wrote:
> Here is one for you guru's and BMOC problem solvers. Must admit there 
> are a lot of good ones in this group.  A 2 meter repeater 15 miles away 
> using a Mastr2 PLL exciter emits a carrier drop pulse of about 500 ms in 
> duration on a frequency 225 khz down from the repeaters xmit freq. 
> Unfortunately this pulse is on the output of another repeater I 
> continuously monitor. The repeater trustee is very knowledgeable and 
> cooperative and is attempting to solve this problem.  He did say the PLL 
> is not quite 5 volts but otherwise seems to work well. The drop pulse on 
> COR is definitely coming from the exciter and can be observed on a SA 
> with PA installed and removed.  It was replaced with another exciter and 
> the second exciter is doing exactly the same thing. Gary K2UQ

Check to see if you aren't feeding a voltage somewhere into the exciter; 
it's possible that a voltage or bias on the audio inputs could be pushing 
it off frequency. Bring out the box of capacitors and see what you can 
come up with.

--
Kris Kirby <[EMAIL PROTECTED]>
   "BIG BROTHER IS WATCHING YOU!"
 This message brought to you by the US Department of Homeland Security




 
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