Re: [Repeater-Builder] Re: Micor PA schematic / Power Control Board
There were 100 watt Micor PA's on VHF, not UHF. At UHF the Micor PA was only rated for 75 watts. -- Original Message -- --- In Repeater-Builder@yahoogroups.com, Gary Glaenzer glaenzer@ wrote: there is no 100 watt Micor amp without qualifiers, that is a pretty broad statement Gary - Original Message - From: Captainlance To: Repeater-Builder@yahoogroups.com Sent: Thursday, October 30, 2008 10:11 AM Subject: Re: [Repeater-Builder] Micor PA schematic / Power Control Board The PA is only factory rated at 78 watts...there is no 100 watt Micor amp. Some however, will do 100... Lance N2HBA - Original Message - From: georgiaskywarn To: Repeater-Builder@yahoogroups.com Sent: Thursday, October 30, 2008 5:44 AM Subject: [Repeater-Builder] Micor PA schematic / Power Control Board Anybody have a schematic for the Micor 100watt PA? Also can only get about 78 watts out of this thing. Have changed out the power control board...either board the power doesn't go up or down. Ideas? Haven't tried this yet; http://www.hamrepeater.org/micr_uhf.htm (bottom of the page to defeat this portion) but am going to try it tonight. Thanks, Robert KD4YDC -- No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.175 / Virus Database: 270.8.5/1755 - Release Date: 10/29/2008 5:27 PM -- No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.175 / Virus Database: 270.8.5/1755 - Release Date: 10/29/2008 5:27 PM
Re: [Repeater-Builder] Re: Micor PA schematic / Power Control Board
As I recall you are correct - 75-watt was UHF Chuck WB2EDV - Original Message - From: JOHN MACKEY [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Friday, October 31, 2008 2:23 AM Subject: Re: [Repeater-Builder] Re: Micor PA schematic / Power Control Board There were 100 watt Micor PA's on VHF, not UHF. At UHF the Micor PA was only rated for 75 watts.
Re: [Repeater-Builder] Re: Micor PA schematic / Power Control Board
That was the rating from Motorola... but they were often-times good for a bit more. In fact, that Community Repeater I just rebuilt from scratch had a 75W PA, and I got just under 100 out of it when I fired it up. Of course, I dialed it down to 50 to keep it legal for GMRS. Mark - N9WYS / WQIV271 --- On Fri, 10/31/08, Chuck Kelsey [EMAIL PROTECTED] wrote: From: Chuck Kelsey [EMAIL PROTECTED] Subject: Re: [Repeater-Builder] Re: Micor PA schematic / Power Control Board To: Repeater-Builder@yahoogroups.com Date: Friday, October 31, 2008, 7:51 AM As I recall you are correct - 75-watt was UHF Chuck WB2EDV - Original Message - From: JOHN MACKEY [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Friday, October 31, 2008 2:23 AM Subject: Re: [Repeater-Builder] Re: Micor PA schematic / Power Control Board There were 100 watt Micor PA's on VHF, not UHF. At UHF the Micor PA was only rated for 75 watts. Yahoo! Groups Links
Re: [Repeater-Builder] Re: Micor PA schematic / Power Control Board
Heh-I've heard that if you take the harmonic filter out of a UHF Mitrek, it'll do over 200. But of course, 1) it won't do it long, 2) a lot of that is on the second harmonic. Just because it will do it, doesn't mean you should ;c)) Mark Tomany wrote: That was the rating from Motorola... but they were often-times good for a bit more. In fact, that Community Repeater I just rebuilt from scratch had a 75W PA, and I got just under 100 out of it when I fired it up. Of course, I dialed it down to 50 to keep it legal for GMRS. Mark - N9WYS / WQIV271 --- On Fri, 10/31/08, Chuck Kelsey [EMAIL PROTECTED] wrote: From: Chuck Kelsey [EMAIL PROTECTED] Subject: Re: [Repeater-Builder] Re: Micor PA schematic / Power Control Board To: Repeater-Builder@yahoogroups.com Date: Friday, October 31, 2008, 7:51 AM As I recall you are correct - 75-watt was UHF Chuck WB2EDV - Original Message - From: JOHN MACKEY [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Friday, October 31, 2008 2:23 AM Subject: Re: [Repeater-Builder] Re: Micor PA schematic / Power Control Board There were 100 watt Micor PA's on VHF, not UHF. At UHF the Micor PA was only rated for 75 watts.
[Repeater-Builder] Re: Micor PA schematic / Power Control Board
Ok. Let's look at this then. I have no power control from the Power Control Board. Can't turn it up or down. Tried 2 different boards as well. 1) Ideas? 2) Don't have the schematic in front of mebut can't find the caps on the schematics I have...listed from the below web site. Thanks, Robert --- In Repeater-Builder@yahoogroups.com, Gary Glaenzer [EMAIL PROTECTED] wrote: there is no 100 watt Micor amp without qualifiers, that is a pretty broad statement Gary - Original Message - From: Captainlance To: Repeater-Builder@yahoogroups.com Sent: Thursday, October 30, 2008 10:11 AM Subject: Re: [Repeater-Builder] Micor PA schematic / Power Control Board The PA is only factory rated at 78 watts...there is no 100 watt Micor amp. Some however, will do 100... Lance N2HBA - Original Message - From: georgiaskywarn To: Repeater-Builder@yahoogroups.com Sent: Thursday, October 30, 2008 5:44 AM Subject: [Repeater-Builder] Micor PA schematic / Power Control Board Anybody have a schematic for the Micor 100watt PA? Also can only get about 78 watts out of this thing. Have changed out the power control board...either board the power doesn't go up or down. Ideas? Haven't tried this yet; http://www.hamrepeater.org/micr_uhf.htm (bottom of the page to defeat this portion) but am going to try it tonight. Thanks, Robert KD4YDC No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.175 / Virus Database: 270.8.5/1755 - Release Date: 10/29/2008 5:27 PM
Re: [Repeater-Builder] Re: Micor PA schematic / Power Control Board
Pull the control lead off of the amp, it is on the backplane, pin 3( a screw) on the top left corner. If you have voltage on the screw, your power board is OK, and the amp is the trouble, usually a bad control stage. if, with the control lead off, you have no voltage, check the chassis mounted transistor underneath the power set board, and the voltages on the 3 pin molex connector that powers the board . you should have one lead at ground, one at 10volts, one at 12 volts. - Original Message - From: georgiaskywarn To: Repeater-Builder@yahoogroups.com Sent: Thursday, October 30, 2008 12:05 PM Subject: [Repeater-Builder] Re: Micor PA schematic / Power Control Board Ok. Let's look at this then. I have no power control from the Power Control Board. Can't turn it up or down. Tried 2 different boards as well. 1) Ideas? 2) Don't have the schematic in front of mebut can't find the caps on the schematics I have...listed from the below web site. Thanks, Robert --- In Repeater-Builder@yahoogroups.com, Gary Glaenzer [EMAIL PROTECTED] wrote: there is no 100 watt Micor amp without qualifiers, that is a pretty broad statement Gary - Original Message - From: Captainlance To: Repeater-Builder@yahoogroups.com Sent: Thursday, October 30, 2008 10:11 AM Subject: Re: [Repeater-Builder] Micor PA schematic / Power Control Board The PA is only factory rated at 78 watts...there is no 100 watt Micor amp. Some however, will do 100... Lance N2HBA - Original Message - From: georgiaskywarn To: Repeater-Builder@yahoogroups.com Sent: Thursday, October 30, 2008 5:44 AM Subject: [Repeater-Builder] Micor PA schematic / Power Control Board Anybody have a schematic for the Micor 100watt PA? Also can only get about 78 watts out of this thing. Have changed out the power control board...either board the power doesn't go up or down. Ideas? Haven't tried this yet; http://www.hamrepeater.org/micr_uhf.htm (bottom of the page to defeat this portion) but am going to try it tonight. Thanks, Robert KD4YDC -- No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.175 / Virus Database: 270.8.5/1755 - Release Date: 10/29/2008 5:27 PM -- No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.175 / Virus Database: 270.8.5/1755 - Release Date: 10/29/2008 5:27 PM
Re: [Repeater-Builder] Re: Micor PA schematic / Power Control Board
What type PA are you referring to ? UHF or VHF ? Model No. ? The power control Bd on the UHF has 2 pots for setting the output level. Make sure they are clean (contact cleaner and rotating back and forth while spraying) The left one, as you face the rptr. sets the upper limit of the power level (by regulation the max, current to the PA), the second one allows you to vary the out put power with in the preset limits. This is apparently a Motorola safety feature. If your having the same problem with 2 Bds. then most likely it is not bad boards. Next item would be to open up the PA and reflow/resolder the solder at all the power transisters legs (these have a tendency to develope cold joints or de-solder themselves over time from heat and age. also flow fresh solder along all the power traces between the transisters to insure they are not cracked, corroded or causing a high resistance. Look for any other damage to component and touch up all the connections you can with the soldering iron. I belive the VHF Micor is basically the same except on the PA the traces between the pwr transisters are not as exposed and as long as on the UHF PA. I did the above to my UHF Micor that had dropped down to about 60w max. and the Max. output jumped to about 112W, but I turned it back to 75W. If that doesn't help then. Maybe someone else out there has a suggestion or two. If I made any incorrect statements i'm sure someone will correct them for you also. -- Doug N3DAB/WPRX486/WPJL709 georgiaskywarn [EMAIL PROTECTED] wrote: = Ok. Let's look at this then. I have no power control from the Power Control Board. Can't turn it up or down. Tried 2 different boards as well. 1) Ideas? 2) Don't have the schematic in front of mebut can't find the caps on the schematics I have...listed from the below web site. Thanks, Robert --- In Repeater-Builder@yahoogroups.com, Gary Glaenzer [EMAIL PROTECTED] wrote: there is no 100 watt Micor amp without qualifiers, that is a pretty broad statement Gary - Original Message - From: Captainlance To: Repeater-Builder@yahoogroups.com Sent: Thursday, October 30, 2008 10:11 AM Subject: Re: [Repeater-Builder] Micor PA schematic / Power Control Board The PA is only factory rated at 78 watts...there is no 100 watt Micor amp. Some however, will do 100... Lance N2HBA - Original Message - From: georgiaskywarn To: Repeater-Builder@yahoogroups.com Sent: Thursday, October 30, 2008 5:44 AM Subject: [Repeater-Builder] Micor PA schematic / Power Control Board Anybody have a schematic for the Micor 100watt PA? Also can only get about 78 watts out of this thing. Have changed out the power control board...either board the power doesn't go up or down. Ideas? Haven't tried this yet; http://www.hamrepeater.org/micr_uhf.htm (bottom of the page to defeat this portion) but am going to try it tonight. Thanks, Robert KD4YDC No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.175 / Virus Database: 270.8.5/1755 - Release Date: 10/29/2008 5:27 PM
[Repeater-Builder] Re: Micor PA schematic / Power Control Board
*I think* this is the number (UHF btw)(Repeater Continuous Duty) TLE8331A Getting ready to try some of the things listed below. Let you know what I find out. Robert KD4YDC --- In Repeater-Builder@yahoogroups.com, [EMAIL PROTECTED] wrote: What type PA are you referring to ? UHF or VHF ? Model No. ? The power control Bd on the UHF has 2 pots for setting the output level. Make sure they are clean (contact cleaner and rotating back and forth while spraying) The left one, as you face the rptr. sets the upper limit of the power level (by regulation the max, current to the PA), the second one allows you to vary the out put power with in the preset limits. This is apparently a Motorola safety feature. If your having the same problem with 2 Bds. then most likely it is not bad boards. Next item would be to open up the PA and reflow/resolder the solder at all the power transisters legs (these have a tendency to develope cold joints or de-solder themselves over time from heat and age. also flow fresh solder along all the power traces between the transisters to insure they are not cracked, corroded or causing a high resistance. Look for any other damage to component and touch up all the connections you can with the soldering iron. I belive the VHF Micor is basically the same except on the PA the traces between the pwr transisters are not as exposed and as long as on the UHF PA. I did the above to my UHF Micor that had dropped down to about 60w max. and the Max. output jumped to about 112W, but I turned it back to 75W. If that doesn't help then. Maybe someone else out there has a suggestion or two. If I made any incorrect statements i'm sure someone will correct them for you also. -- Doug N3DAB/WPRX486/WPJL709 georgiaskywarn [EMAIL PROTECTED] wrote: = Ok. Let's look at this then. I have no power control from the Power Control Board. Can't turn it up or down. Tried 2 different boards as well. 1) Ideas? 2) Don't have the schematic in front of mebut can't find the caps on the schematics I have...listed from the below web site. Thanks, Robert --- In Repeater-Builder@yahoogroups.com, Gary Glaenzer glaenzer@ wrote: there is no 100 watt Micor amp without qualifiers, that is a pretty broad statement Gary - Original Message - From: Captainlance To: Repeater-Builder@yahoogroups.com Sent: Thursday, October 30, 2008 10:11 AM Subject: Re: [Repeater-Builder] Micor PA schematic / Power Control Board The PA is only factory rated at 78 watts...there is no 100 watt Micor amp. Some however, will do 100... Lance N2HBA - Original Message - From: georgiaskywarn To: Repeater-Builder@yahoogroups.com Sent: Thursday, October 30, 2008 5:44 AM Subject: [Repeater-Builder] Micor PA schematic / Power Control Board Anybody have a schematic for the Micor 100watt PA? Also can only get about 78 watts out of this thing. Have changed out the power control board...either board the power doesn't go up or down. Ideas? Haven't tried this yet; http://www.hamrepeater.org/micr_uhf.htm (bottom of the page to defeat this portion) but am going to try it tonight. Thanks, Robert KD4YDC No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.175 / Virus Database: 270.8.5/1755 - Release Date: 10/29/2008 5:27 PM
[Repeater-Builder] Re: Micor PA schematic / Power Control Board
I will do some of the suggestions Doug gave me. I have 15.18v on that pin. Thanks, Robert --- In Repeater-Builder@yahoogroups.com, Captainlance [EMAIL PROTECTED] wrote: Pull the control lead off of the amp, it is on the backplane, pin 3( a screw) on the top left corner. If you have voltage on the screw, your power board is OK, and the amp is the trouble, usually a bad control stage. if, with the control lead off, you have no voltage, check the chassis mounted transistor underneath the power set board, and the voltages on the 3 pin molex connector that powers the board . you should have one lead at ground, one at 10volts, one at 12 volts. - Original Message - From: georgiaskywarn To: Repeater-Builder@yahoogroups.com Sent: Thursday, October 30, 2008 12:05 PM Subject: [Repeater-Builder] Re: Micor PA schematic / Power Control Board Ok. Let's look at this then. I have no power control from the Power Control Board. Can't turn it up or down. Tried 2 different boards as well. 1) Ideas? 2) Don't have the schematic in front of mebut can't find the caps on the schematics I have...listed from the below web site. Thanks, Robert --- In Repeater-Builder@yahoogroups.com, Gary Glaenzer glaenzer@ wrote: there is no 100 watt Micor amp without qualifiers, that is a pretty broad statement Gary - Original Message - From: Captainlance To: Repeater-Builder@yahoogroups.com Sent: Thursday, October 30, 2008 10:11 AM Subject: Re: [Repeater-Builder] Micor PA schematic / Power Control Board The PA is only factory rated at 78 watts...there is no 100 watt Micor amp. Some however, will do 100... Lance N2HBA - Original Message - From: georgiaskywarn To: Repeater-Builder@yahoogroups.com Sent: Thursday, October 30, 2008 5:44 AM Subject: [Repeater-Builder] Micor PA schematic / Power Control Board Anybody have a schematic for the Micor 100watt PA? Also can only get about 78 watts out of this thing. Have changed out the power control board...either board the power doesn't go up or down. Ideas? Haven't tried this yet; http://www.hamrepeater.org/micr_uhf.htm (bottom of the page to defeat this portion) but am going to try it tonight. Thanks, Robert KD4YDC -- No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.175 / Virus Database: 270.8.5/1755 - Release Date: 10/29/2008 5:27 PM -- No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.175 / Virus Database: 270.8.5/1755 - Release Date: 10/29/2008 5:27 PM
Re: [Repeater-Builder] Re: Micor PA schematic / Power Control Board
TLE 8331A is listed as 406 to 420 MHz. TLE 8333A is 450 to 470 MHz. Not sure how far you can move out of the rated range for the 8331A but I don't have any problem with the 8333A moving down to 442 MHz. They are both rated at 75W but in the operating range can probably be tweeked to a higher level. Others can add more info. on this as I'm just a tinkerer, not a Pro. If your getting 75W+/- out of it now that is probably all you will get trying to move it out of band 20 to 25 mhz. If you cant change the output level then you need to look at the Pots, try jumpering them or replacing them. Check around at the HF this weekend and see if you can locate a Micor manual. -- Doug N3DAB/WPRX486/WPJL709 georgiaskywarn [EMAIL PROTECTED] wrote: = *I think* this is the number (UHF btw)(Repeater Continuous Duty) TLE8331A Getting ready to try some of the things listed below. Let you know what I find out. Robert KD4YDC --- In Repeater-Builder@yahoogroups.com, [EMAIL PROTECTED] wrote: What type PA are you referring to ? UHF or VHF ? Model No. ? The power control Bd on the UHF has 2 pots for setting the output level. Make sure they are clean (contact cleaner and rotating back and forth while spraying) The left one, as you face the rptr. sets the upper limit of the power level (by regulation the max, current to the PA), the second one allows you to vary the out put power with in the preset limits. This is apparently a Motorola safety feature. If your having the same problem with 2 Bds. then most likely it is not bad boards. Next item would be to open up the PA and reflow/resolder the solder at all the power transisters legs (these have a tendency to develope cold joints or de-solder themselves over time from heat and age. also flow fresh solder along all the power traces between the transisters to insure they are not cracked, corroded or causing a high resistance. Look for any other damage to component and touch up all the connections you can with the soldering iron. I belive the VHF Micor is basically the same except on the PA the traces between the pwr transisters are not as exposed and as long as on the UHF PA. I did the above to my UHF Micor that had dropped down to about 60w max. and the Max. output jumped to about 112W, but I turned it back to 75W. If that doesn't help then. Maybe someone else out there has a suggestion or two. If I made any incorrect statements i'm sure someone will correct them for you also. -- Doug N3DAB/WPRX486/WPJL709 georgiaskywarn [EMAIL PROTECTED] wrote: = Ok. Let's look at this then. I have no power control from the Power Control Board. Can't turn it up or down. Tried 2 different boards as well. 1) Ideas? 2) Don't have the schematic in front of mebut can't find the caps on the schematics I have...listed from the below web site. Thanks, Robert --- In Repeater-Builder@yahoogroups.com, Gary Glaenzer glaenzer@ wrote: there is no 100 watt Micor amp without qualifiers, that is a pretty broad statement Gary - Original Message - From: Captainlance To: Repeater-Builder@yahoogroups.com Sent: Thursday, October 30, 2008 10:11 AM Subject: Re: [Repeater-Builder] Micor PA schematic / Power Control Board The PA is only factory rated at 78 watts...there is no 100 watt Micor amp. Some however, will do 100... Lance N2HBA - Original Message - From: georgiaskywarn To: Repeater-Builder@yahoogroups.com Sent: Thursday, October 30, 2008 5:44 AM Subject: [Repeater-Builder] Micor PA schematic / Power Control Board Anybody have a schematic for the Micor 100watt PA? Also can only get about 78 watts out of this thing. Have changed out the power control board...either board the power doesn't go up or down. Ideas? Haven't tried this yet; http://www.hamrepeater.org/micr_uhf.htm (bottom of the page to defeat this portion) but am going to try it tonight. Thanks, Robert KD4YDC No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.175 / Virus Database: 270.8.5/1755 - Release Date: 10/29/2008 5:27 PM
