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: [email protected] >[mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] >Sent: Monday, July 25, 2005 2:05 PM >To: [email protected] >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 > >-- >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 > > > > > > > > > >---------- >YAHOO! GROUPS LINKS > * Visit your group > "<http://groups.yahoo.com/group/Repeater-Builder>Repeater-Builder" on the web. > * > * To unsubscribe from this group, send an email to: > * > <mailto:[EMAIL PROTECTED]>[EMAIL PROTECTED] > > * > * Your use of Yahoo! Groups is subject to the > <http://docs.yahoo.com/info/terms/>Yahoo! Terms of Service. > > > >---------- > >-- >No virus found in this outgoing message. >Checked by AVG Anti-Virus. >Version: 7.0.338 / Virus Database: 267.9.4/57 - Release Date: 7/22/2005 Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
