RE: [Repeater-Builder] Narrowbanding
Florida Repeater Coordinator proposes narrowbanding: http://www.florida-repeaters.org/FRC%202meter%20narrowband%20p olicy%20released%207-18-10.pdf Apparently Carson's Rule works different in Florida than it does everywhere else. --- Jeff WN3A
Re: [Repeater-Builder] Narrowbanding
I was wondering about that myself. The bandwidths spec'd just didn't seem to compute in my feeble mind. Scott Scott Zimmerman Amateur Radio Call N3XCC 474 Barnett Road Boswell, PA 15531 Jeff DePolo wrote: Florida Repeater Coordinator proposes narrowbanding: http://www.florida-repeaters.org/FRC%202meter%20narrowband%20p olicy%20released%207-18-10.pdf Apparently Carson's Rule works different in Florida than it does everywhere else. --- Jeff WN3A Yahoo! Groups Links
Re: [Repeater-Builder] Narrowbanding
On 8/2/2010 9:37 AM, Jeff DePolo wrote: Florida Repeater Coordinator proposes narrowbanding: http://www.florida-repeaters.org/FRC%202meter%20narrowband%20p olicy%20released%207-18-10.pdf Apparently Carson's Rule works different in Florida than it does everywhere else. --- Jeff WN3A Wow-how...well...just wrong...As Jeff is alluding to, an analog FM signal that is deviated at +/-2.5 KHz occupies slightly less than a 12.5 KHz channel. (11.0 and 11.2 are common narrowband emission bandwidths in Part 90). Not 6.25. Then there's the comment that Most if not all of the newer Amateur Radio equipment available on the market today in the 144-147 MHz and 430-450 MHz range is capable of using 6.25 KHz (2.5 KHz deviation) channels. Well, besides the gross bandwidth error, you pretty much have to buy Icom to get narrowband. Kenwood's have a toggle in the menu, but it's all or nothing. You can't program NB on a per-channel basis. And I doubt Yaesu is much different. That makes it unusable to me. And let's not forget that while Part 90 users can find ways to buy new radios, and indeed need to not use old radios that are unreliable, hams are footing the bill out of their own pocket, and can't afford to just go out and buy all new gear just to satisfy a few people who think we need more repeaters on 2M (which we don't, by the way. Not around here.) A group that WANTS to VOLUNTARILY narrowband their repeater is welcome to do so, and should notify the council when they do it. But what they propose here is just foolish and completely unnecessary. My advice to anyone in Ohio, and I have to believe FL will be the same, who wants to put up a new repeater is to look at UHF, then either 900 or 220. Unless you can knock a 'paper repeater' off the list, forget 2M. Besides, I'll give up my Heath dual-bander, and my Yaesu FT-270 mobile, and so on, when it dies and becomes unrepairable...not to mention the Micor repeater(s). Jim
Re: [Repeater-Builder] Narrowbanding
On 8/2/2010 10:45 AM, Scott Zimmerman wrote: I was wondering about that myself. The bandwidths spec'd just didn't seem to compute in my feeble mind. Scott Scott Zimmerman Amateur Radio Call N3XCC 474 Barnett Road Boswell, PA 15531 Jeff DePolo wrote: Florida Repeater Coordinator proposes narrowbanding: http://www.florida-repeaters.org/FRC%202meter%20narrowband%20p olicy%20released%207-18-10.pdf Apparently Carson's Rule works different in Florida than it does everywhere else. --- Jeff WN3A Course, wiki says Carson's rule is of little use in spectrum planning anyway...(http://en.wikipedia.org/wiki/Carson_bandwidth_rule). These must be the same people that think Nextel's iDen 6:1 TDMA format fits in a 25 KHz channel, or that think the US DTV standard fits in a 6 MHz channel...NOT!
Re: [Repeater-Builder] Dissasembly of msr 2000 continuous duty amp. How?
Thanks Kevin, I think you are on to something. The areas that are pinned down seem to be close to where the power supply wires enter the board from the underside. I am wondering if the wires are glued down with RTV or something. Cautious prying is still not getting me anywhere. Marty
Re: [Repeater-Builder] Narrowbanding
How wide is it? Chuck WB2EDV - Original Message - From: wd8chl wd8...@gmail.com To: Repeater-Builder@yahoogroups.com Sent: Monday, August 02, 2010 10:58 AM Subject: Re: [Repeater-Builder] Narrowbanding ...or that think the US DTV standard fits in a 6 MHz channel...NOT!
[Repeater-Builder] FS - Motorola Micor VHF/UHF Mobiles GE Low Band Mobiles
Gentlemen in Need: I have several Motorola Micor VHF Mobiles ready to list on eBay and I am prepared to ship. These are VHF units model T73RTN3100B. Appears to be complete with no top or bottom case. Channel elements are included (153 MHz RX / 158 TX ) and sold as they are. They have not been powered up for a while and not sure if they have any issues or not. Just a heads up! Please reply directly / off list so we dont clutter the board up. :-) John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202 http://tinyurl.com/2dtngmn - Original Message - From: gervais To: Repeater-Builder@yahoogroups.com Sent: Sunday, August 01, 2010 5:15 AM Subject: Re: [Repeater-Builder] Give Away - Motorola Micor VHF/UHF Mobiles GE Low Band Mobiles hummm we are so far we would have used this Motorola Micor VHF mobile converted to a 147.080MHz repeater here 73/s all gervais ve2ckn From: Dave Cochran Sent: Saturday, July 31, 2010 9:00 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Give Away - Motorola Micor VHF/UHF Mobiles GE Low Band Mobiles Only 5 hours or so drive from me. and we could really use the equipment down here. I'll talk with a couple of guys and see if I can find a co-pilot or two. Dave - N0TRQ On Sat, Jul 31, 2010 at 5:28 PM, rrath rr...@charter.net wrote: Me three. Rod kc7vqr Me too !! On Sat, Jul 31, 2010 at 4:56 PM, Scott Zimmerman n3...@repeater- builder.com wrote: If only I lived in Texas.. Humph!! Scott Scott Zimmerman Amateur Radio Call N3XCC 474 Barnett Road Boswell, PA 15531 wb5dcu wrote: I am cleaning out the shack and I have the following radios I would like to give away: 7 - Motorola Micor VHF Mobiles 5 - Motorola Micor UHF Mobiles 1 - Motorola Q2904A UHF Industrial repeater 1 - Motorola Syntor UHF 1 - Motorola Mitrek UHF 1 - GE Master II Low Band mobile with accessories 1 - GE Master PRO Low Band mobile with accessories 1 - Motorola Micor VHF mobile converted to a 147.080MHz repeater mounted in BUD cabinet with NHRC-2 controller. Some of the Micor's are parts radios, they were given to our repeater group by a local 2 way shop that was going out of business. The 147.08 repeater was taken out of service about 5 years ago. It was working when we replaced it with a new repeater. These are free, take all or none. I will NOT ship, local pick up only. I live in Sherman Texas which is located north of Dallas Texas on US Highway 75. Contact me by email at wb5d...@verizon.net Yahoo! Groups Links -- Always drink upstream from the herd.
RE: [Repeater-Builder] Narrowbanding
At 8/2/2010 06:37, you wrote: Florida Repeater Coordinator proposes narrowbanding: http://www.florida-repeaters.org/FRC%202meter%20narrowband%20p olicy%20released%207-18-10.pdf Apparently Carson's Rule works different in Florida than it does everywhere else. Well put, Jeff. IMO 10 kHz is about the limit for any kind of voice emission, it has to be digital in order to be anything less than 12.5 kHz. We have a small D-Star sub-band on 2 meters here in SoCal that's spaced @ 10 kHz it seems to be working. I applaud the FRC's initiative in wanting to do something to increase spectrum efficiency, but 7.5 kHz is simply going too far. Heck, some parts of the country can't even make 15 kHz work, have gone to 20 kHz spacing throughout the entire 2 meter band. Bob NO6B
[Repeater-Builder] Astron 70Amp Supply
I am using an ASTRON 70 amp ( un-metered ) supply in my rack. It has a fan on it that I have NEVER seen come on. Is there an internal adjustment of some nature based on the ambient temperature that can be maneuvered to make this fan more 'useful? Thanks.. - Mike
RE: [Repeater-Builder] Astron 70Amp Supply
Do not worry too much about the fan, it will come on if the temperature on the heat sink rises, you will have to draw quite a bit of current continuously to get it to come on. Leroy J39AI -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Michael Ryan Sent: Monday, August 02, 2010 3:56 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Astron 70Amp Supply I am using an ASTRON 70 amp ( un-metered ) supply in my rack. It has a fan on it that I have NEVER seen come on. Is there an internal adjustment of some nature based on the ambient temperature that can be maneuvered to make this fan more 'useful? Thanks.. - Mike __ Information from ESET NOD32 Antivirus, version of virus signature database 5335 (20100802) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com http://www.eset.com
RE: [Repeater-Builder] Astron 70Amp Supply
Thanks Leroy..the cabinet is warmer that I like to see even when the repeater is just in 'idle mode' for long periods. - M From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Leroy A. M. Baptiste Sent: Monday, August 02, 2010 4:03 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Astron 70Amp Supply Do not worry too much about the fan, it will come on if the temperature on the heat sink rises, you will have to draw quite a bit of current continuously to get it to come on. Leroy J39AI -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Michael Ryan Sent: Monday, August 02, 2010 3:56 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] Astron 70Amp Supply I am using an ASTRON 70 amp ( un-metered ) supply in my rack. It has a fan on it that I have NEVER seen come on. Is there an internal adjustment of some nature based on the ambient temperature that can be maneuvered to make this fan more 'useful? Thanks.. - Mike __ Information from ESET NOD32 Antivirus, version of virus signature database 5335 (20100802) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5335 (20100802) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5335 (20100802) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com
RE: [Repeater-Builder] Astron 70Amp Supply
For years all my power supplies have been Astrons, they are really some work horses. Believe me, if it gets too hot, that fan will come on, providing that there is not a fault in the thermal circuit. They are great power supplies. -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Michael Ryan Sent: Monday, August 02, 2010 4:07 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Astron 70Amp Supply Thanks Leroy..the cabinet is warmer that I like to see even when the repeater is just in 'idle mode' for long periods. - M From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Leroy A. M. Baptiste Sent: Monday, August 02, 2010 4:03 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Astron 70Amp Supply Do not worry too much about the fan, it will come on if the temperature on the heat sink rises, you will have to draw quite a bit of current continuously to get it to come on. Leroy J39AI -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Michael Ryan Sent: Monday, August 02, 2010 3:56 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] Astron 70Amp Supply I am using an ASTRON 70 amp ( un-metered ) supply in my rack. It has a fan on it that I have NEVER seen come on. Is there an internal adjustment of some nature based on the ambient temperature that can be maneuvered to make this fan more 'useful? Thanks.. - Mike __ Information from ESET NOD32 Antivirus, version of virus signature database 5335 (20100802) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com http://www.eset.com http://www.eset.com http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5335 (20100802) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5335 (20100802) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5335 (20100802) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com http://www.eset.com
Re: [Repeater-Builder] Narrowbanding
I was wondering about that myself. A couple of comments on the other aspects: 1. I see this as falling flat on its face. May as well mandate D-STAR. 2. How are the commercial people fitting SNFM in 7.5 kHz channels as they have been doing on VHF? Joe M. Chuck Kelsey wrote: How wide is it? Chuck WB2EDV - Original Message - From: wd8chl wd8...@gmail.com To: Repeater-Builder@yahoogroups.com Sent: Monday, August 02, 2010 10:58 AM Subject: Re: [Repeater-Builder] Narrowbanding ...or that think the US DTV standard fits in a 6 MHz channel...NOT! Yahoo! Groups Links
Re: [Repeater-Builder] Narrowbanding
FWIW it would probably be made to workat a price, but for ordinary consumer type Amateur Radios, not really. We have been conditioned to the sub $400 price range radios that do everything, go everywhere and have less than ordinary receivers in them. :-) 73, Jack VK4JRC Sent from my Apple iPad Tablet PC On Aug 3, 2010, at 6:16 AM, MCH m...@nb.net wrote: I was wondering about that myself. A couple of comments on the other aspects: 1. I see this as falling flat on its face. May as well mandate D-STAR. 2. How are the commercial people fitting SNFM in 7.5 kHz channels as they have been doing on VHF? Joe M.
[Repeater-Builder] Re: Give Away - Motorola Micor VHF/UHF Mobiles GE Low Band Mobiles
The Free Motorola Micor VHF/UHF Mobiles GE Low Band Mobiles are all gone.
Re: [Repeater-Builder] Dissasembly of msr 2000 continuous duty amp. How?
radi...@aol.com wrote: Thanks Kevin, I think you are on to something. The areas that are pinned down seem to be close to where the power supply wires enter the board from the underside. I am wondering if the wires are glued down with RTV or something. Cautious prying is still not getting me anywhere. Marty Get a friend. Using two solder guns (Weller 8200 or like) heat both joints where the feed-through pins come through. Pull straight up when you have both heated well enough that the solder is fully molten. This process can be done with one gun/iron, but it's difficult at best; as you have to alternately heat and pry which puts a good bit of strain on the board until it becomes free. You could also try a de-soldering tool cleaning out the holes where the feed-throughs protrude from the board, but again, this can be difficult to remove the solder that lays under the board depending on the amount of heat you apply and the quality of your de-soldering pump. Kevin
RE: [Repeater-Builder] Astron 70Amp Supply
Ok Leroy, I will leave well enough alone. Thanks.. - Mike From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Leroy A. M. Baptiste Sent: Monday, August 02, 2010 4:16 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Astron 70Amp Supply For years all my power supplies have been Astrons, they are really some work horses. Believe me, if it gets too hot, that fan will come on, providing that there is not a fault in the thermal circuit. They are great power supplies. -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Michael Ryan Sent: Monday, August 02, 2010 4:07 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: RE: [Repeater-Builder] Astron 70Amp Supply Thanks Leroy..the cabinet is warmer that I like to see even when the repeater is just in 'idle mode' for long periods. - M From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Leroy A. M. Baptiste Sent: Monday, August 02, 2010 4:03 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: RE: [Repeater-Builder] Astron 70Amp Supply Do not worry too much about the fan, it will come on if the temperature on the heat sink rises, you will have to draw quite a bit of current continuously to get it to come on. Leroy J39AI -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Michael Ryan Sent: Monday, August 02, 2010 3:56 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] Astron 70Amp Supply I am using an ASTRON 70 amp ( un-metered ) supply in my rack. It has a fan on it that I have NEVER seen come on. Is there an internal adjustment of some nature based on the ambient temperature that can be maneuvered to make this fan more 'useful? Thanks.. - Mike __ Information from ESET NOD32 Antivirus, version of virus signature database 5335 (20100802) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com http://www.eset.com http://www.eset.com http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5335 (20100802) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5335 (20100802) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5335 (20100802) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5335 (20100802) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5335 (20100802) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com
Re: [Repeater-Builder] Dissasembly of msr 2000 continuous duty amp. How?
OK Kevin, I had already tried the desoldering with a really good Pace unit, but the heat did not transfer well. I will get a buddy to help and use my Weller guns. I have a big 250 watt one here somewhere. Marty
Re: [Repeater-Builder] Narrowbanding
Here in Washington State our agency is running on 7.5 channels using 11K2F3D/11K2F3E. Frequency coordination has to be a little creative as the channels of course overlap. Need to keep the repeaters far enough apart such the signal level of the overlap is of no consequence to the adjacent channel. This is much the same concept used in CA years ago when two meters was switched 15 kHz channel centers. Rob K7TGU - Original Message - From: MCH m...@nb.net To: Repeater-Builder@yahoogroups.com Sent: Monday, August 02, 2010 13:16 Subject: Re: [Repeater-Builder] Narrowbanding I was wondering about that myself. A couple of comments on the other aspects: 1. I see this as falling flat on its face. May as well mandate D-STAR. 2. How are the commercial people fitting SNFM in 7.5 kHz channels as they have been doing on VHF? Joe M. Chuck Kelsey wrote: How wide is it? Chuck WB2EDV - Original Message - From: wd8chl wd8...@gmail.com To: Repeater-Builder@yahoogroups.com Sent: Monday, August 02, 2010 10:58 AM Subject: Re: [Repeater-Builder] Narrowbanding ...or that think the US DTV standard fits in a 6 MHz channel...NOT! Yahoo! Groups Links Yahoo! Groups Links
Re: [Repeater-Builder] Dissasembly of msr 2000 continuous duty amp. How?
radi...@aol.com wrote: OK Kevin, I had already tried the desoldering with a really good Pace unit, but the heat did not transfer well. I will get a buddy to help and use my Weller guns. I have a big 250 watt one here somewhere. Marty Let us know how you make out - or, if you need more help... Kevin
Re: [Repeater-Builder] Dissasembly of msr 2000 continuous duty amp. How?
Motorola didn't do anyone any favors with that design. Same thing on the Micor PA. Chuck WB2EDV - Original Message - From: Kevin Custer To: Repeater-Builder@yahoogroups.com Sent: Monday, August 02, 2010 8:29 PM Subject: Re: [Repeater-Builder] Dissasembly of msr 2000 continuous duty amp. How? radi...@aol.com wrote: OK Kevin, I had already tried the desoldering with a really good Pace unit, but the heat did not transfer well. I will get a buddy to help and use my Weller guns. I have a big 250 watt one here somewhere. Marty Let us know how you make out - or, if you need more help... Kevin
[Repeater-Builder] Re: Dissasembly of msr 2000 continuous duty amp. How?
martinfriedman67 radi...@... wrote: Our Amateur radio club's Motorola MSR 2000 continuous duty amp needs repair. I cant figure out how to remove the amp board from the heat sink. I removed all screws from corners as well as the transistors. It seems to be held by the center, just below the tall air variable cap. I tried heating the solder in the area but, no joy. I don't want to crack the board. The drawings in the manual I found here do not show even the screw holes. Thanks in advance, 73, Marty (WB2BEW) Been there, done that, coffee mug and T-shirt It's not easy... I'm doing two MSR-2000 PA's right now (just in the door yesterday) and I completed my last MSR UHF PA repair a year or two back. Everyone has a different technique and mine depends on the specific failed stage/parts. I use a very large mass soldering iron (better than a gun) to quickly get on and off the portions I need to deal with. I reflow the solder in most of the anchor places using a small amount of new (solder) and lots of quick on/off, well spaced long-time to slowly cool down... between applying the iron to repeat locations. Then comes a decent amount of quick on/off Solder Wick to remove much of the original and added solder, then flat blade X-acto knives (and razors) to carefully wedge up the securing contact surfaces. Sometimes I can and do reflow a bit of solder back into the cleaned section during the flat blade lift process as a method of quickly transferring heat to a very localized area/spot. The key is to get/keep the ceramic substrate as cool as possible. The MSR Power Supply pins poke up into the substrate(s) ... The entire project including obtaining the parts from recycled radios takes me about 4.5 hours with beverage of choice and some decent AM Talk-Radio playing at low back-ground volume level (no, not the right-wing whack job stuff). Once you've had to do this type of Motorola PA repair, you more fully appreciate trying to keep the amplifier happy and cool. cheers, skipp
Re: [Repeater-Builder] Narrowbanding
I do not know about Nextel, but, the US DTV signal fits into a 6 MHz bandwidth. We use a mask filter to ensure that the bandwidth is no more than 6 MHz. 500 kHz from band edge = -47 dB 6 MHz from band edge = -110 dB 73 Glenn WB4UIV At 10:58 AM 8/2/2010, you wrote: On 8/2/2010 10:45 AM, Scott Zimmerman wrote: I was wondering about that myself. The bandwidths spec'd just didn't seem to compute in my feeble mind. Scott Scott Zimmerman Amateur Radio Call N3XCC 474 Barnett Road Boswell, PA 15531 Jeff DePolo wrote: Florida Repeater Coordinator proposes narrowbanding: http://www.florida-repeaters.org/FRC%202meter%20narrowband%20p olicy%20released%207-18-10.pdf Apparently Carson's Rule works different in Florida than it does everywhere else. --- Jeff WN3A Course, wiki says Carson's rule is of little use in spectrum planning anyway...(http://en.wikipedia.org/wiki/Carson_bandwidth_rule). These must be the same people that think Nextel's iDen 6:1 TDMA format fits in a 25 KHz channel, or that think the US DTV standard fits in a 6 MHz channel...NOT! Yahoo! Groups Links
[Repeater-Builder] Re: Dissasembly of msr 2000 continuous duty amp. How?
radi...@... wrote: OK Kevin, I had already tried the desoldering with a really good Pace unit, but the heat did not transfer well. Yep, not enough heat available from most solder suckers, irons and guns. I will get a buddy to help and use my Weller guns. I have a big 250 watt one here somewhere. Marty The Weller 550D gun is probably the smallest gun you can realistically get away with using. I use the mass of an old martial-aid size soldering iron, which are often passed over by uninformed souls shopping at Ham Flea Markets. s.
[Repeater-Builder] Re: Astron 70Amp Supply
The fan will come on at 120 degrees F, right heatsink temperature if I remember correctly so the supply will be a bit toasty before the fan comes on. There's also a thermal cutout at 190 degrees that will shut down the supply. Astron alludes to the high junction operating temperatures of the pass transistors in their service manual so, based on that comment, I would say that there is nothing to be concerned about. Tom DGN --- In Repeater-Builder@yahoogroups.com, Michael Ryan mryan...@... wrote: Ok Leroy, I will leave well enough alone. Thanks.. - Mike From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Leroy A. M. Baptiste Sent: Monday, August 02, 2010 4:16 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Astron 70Amp Supply For years all my power supplies have been Astrons, they are really some work horses. Believe me, if it gets too hot, that fan will come on, providing that there is not a fault in the thermal circuit. They are great power supplies. -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Michael Ryan Sent: Monday, August 02, 2010 4:07 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: RE: [Repeater-Builder] Astron 70Amp Supply Thanks Leroy..the cabinet is warmer that I like to see even when the repeater is just in 'idle mode' for long periods. - M From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Leroy A. M. Baptiste Sent: Monday, August 02, 2010 4:03 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: RE: [Repeater-Builder] Astron 70Amp Supply Do not worry too much about the fan, it will come on if the temperature on the heat sink rises, you will have to draw quite a bit of current continuously to get it to come on. Leroy J39AI -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Michael Ryan Sent: Monday, August 02, 2010 3:56 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] Astron 70Amp Supply I am using an ASTRON 70 amp ( un-metered ) supply in my rack. It has a fan on it that I have NEVER seen come on. Is there an internal adjustment of some nature based on the ambient temperature that can be maneuvered to make this fan more 'useful? Thanks.. - Mike __ Information from ESET NOD32 Antivirus, version of virus signature database 5335 (20100802) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com http://www.eset.com http://www.eset.com http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5335 (20100802) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5335 (20100802) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5335 (20100802) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5335 (20100802) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5335 (20100802) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com
Re: [Repeater-Builder] Re: Dissasembly of msr 2000 continuous duty amp. How?
Maybe a little Black Powder might be needed? Gordon ZL1KL Tauranga N.Z.
[Repeater-Builder] Re: Give Away - Motorola Micor VHF/UHF Mobiles GE Low Band Mobiles
Larry, Are you looking for a 4, 8 or 12 channel radio? Do you need a set of accessories also? Standard or Systems 90? I will do some looking if you would like. I may know where there is a decent radio. Maybe we could do some trading. Joe - WA7JAW
[Repeater-Builder] Desoldering MSR2000 RX PCB
A recent thread discussed a problem disassembling a MSR2000 continuous duty PA. That triggers this query: Does anyone know if Motorola used a higher temperature solder on the MSR2000 units? My reason for asking is that this past weekend I had a hard time removing three leaky electrolytic capacitors from a MSR2000 VHF receiver board. I ended up using a 45 watt soldering pencil, which I only use for stubborn jobs, but even it had a very hard time melting the solder on the positive leads and didn't do anything for the leads soldered to ground. I've never experienced this before on a PCB. In fact the 45 watt pencil usually works well on double-sided PCBs with small to moderate groundplanes, although I'll be the first to admit that it doesn't have enough heat to handle really massive groundplanes found on some industrial PCBs. I've replaced components on many a Micor and Mitrek mobile using my 15 and 20 watt soldering pencils without a problem, so this experience came as a complete surprise. Any thoughts? 73 and aloha, Eric KH6CQ
RE: [Repeater-Builder] Re: Astron 70Amp Supply
Thanks for that added info Tom.. I appreciate it. - Mike From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of wb6dgn Sent: Monday, August 02, 2010 11:39 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Astron 70Amp Supply The fan will come on at 120 degrees F, right heatsink temperature if I remember correctly so the supply will be a bit toasty before the fan comes on. There's also a thermal cutout at 190 degrees that will shut down the supply. Astron alludes to the high junction operating temperatures of the pass transistors in their service manual so, based on that comment, I would say that there is nothing to be concerned about. Tom DGN --- In Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com , Michael Ryan mryan...@... wrote: Ok Leroy, I will leave well enough alone. Thanks.. - Mike From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Leroy A. M. Baptiste Sent: Monday, August 02, 2010 4:16 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: RE: [Repeater-Builder] Astron 70Amp Supply For years all my power supplies have been Astrons, they are really some work horses. Believe me, if it gets too hot, that fan will come on, providing that there is not a fault in the thermal circuit. They are great power supplies. -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Michael Ryan Sent: Monday, August 02, 2010 4:07 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: RE: [Repeater-Builder] Astron 70Amp Supply Thanks Leroy..the cabinet is warmer that I like to see even when the repeater is just in 'idle mode' for long periods. - M From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Leroy A. M. Baptiste Sent: Monday, August 02, 2010 4:03 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: RE: [Repeater-Builder] Astron 70Amp Supply Do not worry too much about the fan, it will come on if the temperature on the heat sink rises, you will have to draw quite a bit of current continuously to get it to come on. Leroy J39AI -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Michael Ryan Sent: Monday, August 02, 2010 3:56 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] Astron 70Amp Supply I am using an ASTRON 70 amp ( un-metered ) supply in my rack. It has a fan on it that I have NEVER seen come on. Is there an internal adjustment of some nature based on the ambient temperature that can be maneuvered to make this fan more 'useful? Thanks.. - Mike __ Information from ESET NOD32 Antivirus, version of virus signature database 5335 (20100802) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com http://www.eset.com http://www.eset.com http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5335 (20100802) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5335 (20100802) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5335 (20100802) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5335 (20100802) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature
Re: [Repeater-Builder] Desoldering MSR2000 RX PCB
For de-soldering I use a de-solder iron with a squeeze bulb on it from Radio Shack, works great. http://www.radioshack.com/product/index.jsp?productId=2062731 tom On 8/3/2010 1:17 AM, Eric Grabowski wrote: A recent thread discussed a problem disassembling a MSR2000 continuous duty PA. That triggers this query: Does anyone know if Motorola used a higher temperature solder on the MSR2000 units? My reason for asking is that this past weekend I had a hard time removing three leaky electrolytic capacitors from a MSR2000 VHF receiver board. I ended up using a 45 watt soldering pencil, which I only use for stubborn jobs, but even it had a very hard time melting the solder on the positive leads and didn't do anything for the leads soldered to ground. I've never experienced this before on a PCB. In fact the 45 watt pencil usually works well on double-sided PCBs with small to moderate groundplanes, although I'll be the first to admit that it doesn't have enough heat to handle really massive groundplanes found on some industrial PCBs. I've replaced components on many a Micor and Mitrek mobile using my 15 and 20 watt soldering pencils without a problem, so this experience came as a complete surprise. Any thoughts? 73 and aloha, Eric KH6CQ Yahoo! Groups Links
