I've watched this thread and can't resist contributing my experiences. I supported a Spectrum SCR-1000 VHF repeater for my ham club for more than 3 years. It never operated to our satisfaction. Key problems:
1. Transmitter spurs caused by leaky caps that overheated. 2. Poor power supply design - Darlington TO-3 pass transistor would fail short circuit, placing 18V unregulated on the TX and RX. 3. Original receiver was obsoleted by Spectrum as it lacked adequate IF selectivity. The new RX wasn't much better. 4. Receiver pre-selector had a higher noise figure than the front end of the RX. The repeater actually heard better without the pre-selector. We finally dumped it and got a GE 100w Master. After we learned to improve cooling and run it at 80w rather than to reduce power in the PA, it was clean and worked flawlessly. My two cents... Kim, K5TU -----Original Message----- From: Kevin Bednar [mailto:[EMAIL PROTECTED] Sent: Tuesday, January 06, 2004 5:13 PM To: [email protected] Subject: RE: [RE: [RE: [[Repeater-Builder] Repeater Help]]] Well, considering the "technical standards" (or lack thereof) that Spectru m uses I gues ANYTHING is an improvement! ;) LOL Kevin -----Original Message----- From: JOHN MACKEY [mailto:[EMAIL PROTECTED] Sent: Tuesday, January 06, 2004 6:02 PM To: [email protected] Subject: Re: [RE: [RE: [[Repeater-Builder] Repeater Help]]] "Kevin Bednar" <[EMAIL PROTECTED]> wrote: SNIP > At least I'm > one of the people that cares enough to NOT put drifty piece of crap on > the air. ;) Kevin, for that I applaud you!!! Just a few weeks ago we had a person come on this mail list, & ask about spectrum repeaters. He was told all the horror stories from many different people about all their problems. Then he announced that he thinks he can make one work using better technical standards (or some foolish statement like that). 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/ 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/ -- ------------------------------------------------------------------------ ---- -------------- This message has been inspected by DynaComm i:mail 3.0 http://www.futuresoft.com ------------------------------------------------------------------------ ---- -------------- 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/
