Re: [Repeater-Builder] GE MASTR ER41 Receiver Low Audio Output

[Mathew Quaife]

Hi Dave, wanted to say thanks for the help.  The receiver went into the repeater last evening, and what a major imporvment.  Handhelds can get in from 15 miles away now.  With an antenna height of only 100', that is pretty good in my book.    Mathew   ----- Original Message ----- From: Dave Baughn To: Repeater-Builder@yahoogroups.com Sent: Tuesday, November 23, 2004 3:25 PM Subject: Re: [Repeater-Builder] GE MASTR ER41 Receiver Low Audio Output Matt, no it is not worth the trouble. Just feed only the 10 volt section. That will disable the audio. The 12 volts is only used for audio out. Dave   Dave Baughn Director of Engineering The University of Alabama Center for Public Television and Radio Box 870150 Tuscaloosa, Alabama 35487 205.348.8622 cell 205-310-8798 NEW EMAIL [EMAIL PROTECTED] >>> [EMAIL PROTECTED] 11/23/04 01:13PM >>> Ok found all of that, this is the E version.  I checked the voltage on the transitor, its about 1/2 of what it should be.  I just wonder if this low audio will hamper the use of it any in the repeater situation.  The sensitivity of the receiver is excellent, at .17 Uv at 12 DB.  I am using the discriminator audio portion of it.  What do you think.  Is it worth the trouble to repair it, since I will never need to use the audio output of the receiver.   Mathew Matt, it is likely the audio output transistor. ER41 comes in two versions. One has about 2 watts of audio from one transistor. The other has two transistors and about 10 watts out. In both cases the transistors are mounted underneath the receiver on a tab on the heatsink. If yours has tone, you will have to loosen the tone board to see the transistor(s). I have seen the one transistor version fail where it will still have some audio. The two transistor version sometimes has a small resistor in the bias circuit that changes value. In this case, the audio will usually also be quite distorted. I think it is 240 ohms or so. I don't have the diagram here now. Seems like the metering socket has a pin to check the bias on the output transistor. If it cannot be adjusted into specs, the transistor or the resistor are the most likely suspects from my experience, although I have seen other problems. nd where to look.  I have not done any trouble shooting at this point, but thought by chance if is was a common problem someone could point me in the right direction.  Thanks. Mathew 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/   Dave Baughn Director of Engineering The University of Alabama Center for Public Television and Radio Box 870150 Tuscaloosa, Alabama 35487 205.348.8622 cell 205-310-8798 NEW EMAIL [EMAIL PROTECTED] 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 the Yahoo! Terms of Service.