Re: [Repeater-Builder] AEA Isopole data needed at repeater-builder... file cabinet checking time...
Back in the '70s we built an antenna for the VHF repeater in Commerce, TX that used the same type design as the Isopole, although I have never examined an Isopole in detail. (I think it came along much later) We ran across the design somewhere and it used a combination of 3/4 and 1 inch steel electrical conduit. The antenna was very simple, with a 1/4 wave stinger sticking out the top and connected to the center of the coax. A 1/4 wave section of 1 inch conduit was welded to a washer that had been cut out to clear the top and was welded to the top of the 3/4 inch conduit main mast, and was air insulated from the weld at the top down to the open skirt at the bottom. The shield of the coax was connected to the top of this first 1/4 wave section. Then 1/4 wave below the first skirt, another 1/4 wave section of 1 inch conduit was welded to the mast at the top and open at the bottom, using another washer cut out to clear the mast. Another 1/4 wave below that was another 1/4 wave section of one inch tubing welded to the mast at the top. The article as I recall mentioned that the lower sections of the antenna were 'shock' excited by the top section, and contributed in phase to the overall radiation of the antenna. We had excellent operation with this antenna until the first lightning strike which took out the coax all the way back to the duplexer. Absolutely no ground provided by the antenna to the center conductor with this lash up. Excellent SWR and bandwidth from this simple antenna until the demise of the coax. It was located on top of a light standard at the football field. Electrically the antenna was three half waves in phase, but the three sections were not fed equal power. 73 - Jim W5ZIT -Original Message- From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Sun, 14 Jan 2007 10:51 PM Subject: Re: [Repeater-Builder] AEA Isopole data needed atrepeater-builder... file cabinet checking time... In 1979 Mike Lamb, N7ML, founder of AEA once published a brief by Don Reynolds entitled 'Facts About Proper VHF Vertical Antenna Design' which describes the "Isopole" design in detail. If I recall correctly the design falls under patent # 4352109 (viewable at the U.S. Patent website). Later this week I will try to scan the published brief and send the images to Mike, perhaps he can assemble them into a folder or .pdf on the RB website. Both the patent and the brief describe the design in detail and I hope they answer your questions. Oh, the Isopole was only offered in 2m, 220Mhz, and 440Mhz as well as a few commercial bands. Gary [EMAIL PROTECTED] wrote: > Yes, I see that from the prior posting of the instructions. I guess that's > why it didn't work well for me. I thought it was supposed to be a dipole > equivalent so figured the 1st cone goes right at the feedpoint. Now I'd > like to know the theory behind the correct cone placement. > > Bob NO6B Check Out the new free AIM(R) Mail -- 2 GB of storage and industry-leading spam and email virus protection.
Re: [Repeater-Builder] AEA Isopole data needed atrepeater-builder... file cabinet checking time...
In 1979 Mike Lamb, N7ML, founder of AEA once published a brief by Don Reynolds entitled 'Facts About Proper VHF Vertical Antenna Design' which describes the "Isopole" design in detail. If I recall correctly the design falls under patent # 4352109 (viewable at the U.S. Patent website). Later this week I will try to scan the published brief and send the images to Mike, perhaps he can assemble them into a folder or .pdf on the RB website. Both the patent and the brief describe the design in detail and I hope they answer your questions. Oh, the Isopole was only offered in 2m, 220Mhz, and 440Mhz as well as a few commercial bands. Gary [EMAIL PROTECTED] wrote: > Yes, I see that from the prior posting of the instructions. I guess that's > why it didn't work well for me. I thought it was supposed to be a dipole > equivalent so figured the 1st cone goes right at the feedpoint. Now I'd > like to know the theory behind the correct cone placement. > > Bob NO6B
Re: [Repeater-Builder] AEA Isopole data needed at repeater-builder... file cabinet checking time...
At 1/14/2007 17:01, you wrote: >* [EMAIL PROTECTED] <[EMAIL PROTECTED]> [2007 Jan 14 >11:33 -0600]: > > > I also have a 220 Isopole but no data sheet. Never needed it, > > though. AFAIK the upper decoupling cone mounts at the top of the mast > near > > the feedpoint, & the 2nd cone mounts at the bottom of the 1st. Then > again, > > maybe I'm wrong & that's why that antenna never worked worth a darn. > >As I recall (been a long time) the upper cone had to be mounted below >the feedpoint a distance about equivalent to the length of the stinger. >The second cone did indeed mount below the first. Yes, I see that from the prior posting of the instructions. I guess that's why it didn't work well for me. I thought it was supposed to be a dipole equivalent so figured the 1st cone goes right at the feedpoint. Now I'd like to know the theory behind the correct cone placement. Bob NO6B
Re: [Repeater-Builder] AEA Isopole data needed at repeater-builder... file c...
In a message dated 1/14/2007 5:23:19 P.M. Pacific Standard Time, [EMAIL PROTECTED] writes: All that aside, has anyone tried the Spectral Isopole? I'd be curious to know how they compare to the AEA classic. For all practical purposes, they are identical
Re: [Repeater-Builder] AEA Isopole data needed at repeater-builder... file c...
Nate Bargmann wrote: > Looking over Spectral's site, I'm not sure what the current holder > could sue over except, perhaps, trademark infringement by using the > Isopole name. My limited understanding of trademark law is that a > rights holder must defend the trademark or lose it. I do recall that > AEA (or somebody) held a patent on the Isopole when I bought mine in > 1985 which should have expired some time ago. Unauthorized use of the trademark name is exactly what they might have sued for if it were possible. The original patent, expired or not, was a U.S. patent not an international patent so no action could have been taken until and unless Spectral established themselves in the U.S. > It's unfortunate that the follow on rights holder never did produce the > AEA Isopole. Had I known the future when AEA was disolved, I would > have laid my hands on a couple. At the time there was no measurable interest in a single band omni antenna. The plethora of dual band and multiband radios available at that time sparked interest in only dual band or multiband antennas so Isopole sales dropped significantly. I bought out much of AEA's stock on Isopoles back at the turn of the century and had great difficulty finding new homes for them all. AEA still had dozens of the UHF Isopoles at that time and couldn't hardly give them away then. Don't forget about MFJ's copy of the Isoloop- it too is an unmistakable copy of an AEA product but there was no protection in place at that time such as an international patent. 73, Gary
Re: [Repeater-Builder] AEA Isopole data needed at repeater-builder... file c...
* Gary <[EMAIL PROTECTED]> [2007 Jan 14 18:11 -0600]: > Negative. AEA has not folded nor did they sell any rights to any of their > products to this Spectral company from Argentina. What happened is that the > original owner of AEA sold the digital product designs to Timewave and the > antenna products to Tempo Corp. including the Isopole, Isoloop, and antenna > analyzers. Tempo later sold the product line to a private owner who still owns > a significant portion of the company today. Spectral came along about 5 years > ago with their stainless steel version of the Isopole and have been boldly > marketing it ever since. The current AEA company simply can not afford the > legal fees associated with sueing Spectral so they've taken no action. The > current AEA has focused on the analyzer products making significant > improvements and doing quite well in several markets. I have loads of Isopole > info stuffed away. I'll try to find it, scan it, and get it over to Mike. Looking over Spectral's site, I'm not sure what the current holder could sue over except, perhaps, trademark infringement by using the Isopole name. My limited understanding of trademark law is that a rights holder must defend the trademark or lose it. I do recall that AEA (or somebody) held a patent on the Isopole when I bought mine in 1985 which should have expired some time ago. It's unfortunate that the follow on rights holder never did produce the AEA Isopole. Had I known the future when AEA was disolved, I would have laid my hands on a couple. All that aside, has anyone tried the Spectral Isopole? I'd be curious to know how they compare to the AEA classic. 73, de Nate >> -- Wireless | Amateur Radio Station N0NB | Successfully Microsoft Amateur radio exams; ham radio; Linux info @ | free since January 1998. http://www.qsl.net/n0nb/ | "Debian, the choice of My Kawasaki KZ-650 SR @| a GNU generation!" http://www.networksplus.net/n0nb/ | http://www.debian.org
Re: [Repeater-Builder] AEA Isopole data needed at repeater-builder... file cabinet checking time...
* [EMAIL PROTECTED] <[EMAIL PROTECTED]> [2007 Jan 14 11:33 -0600]: > I also have a 220 Isopole but no data sheet. Never needed it, > though. AFAIK the upper decoupling cone mounts at the top of the mast near > the feedpoint, & the 2nd cone mounts at the bottom of the 1st. Then again, > maybe I'm wrong & that's why that antenna never worked worth a darn. As I recall (been a long time) the upper cone had to be mounted below the feedpoint a distance about equivalent to the length of the stinger. The second cone did indeed mount below the first. Mine was an excellent performer for being an omni antenna. 73, de Nate >> -- Wireless | Amateur Radio Station N0NB | Successfully Microsoft Amateur radio exams; ham radio; Linux info @ | free since January 1998. http://www.qsl.net/n0nb/ | "Debian, the choice of My Kawasaki KZ-650 SR @| a GNU generation!" http://www.networksplus.net/n0nb/ | http://www.debian.org
RE: [Repeater-Builder] Re: Switching Power Supply vs. Astron Etc.
I was wrong about the MICOR Power Supply number. I went by the number of the other supply shown in the MICOR UHF Repeater manual, instead of actually going out across the snow into the COLD garage to visibly look at the Supply. Its number is TPN1095A (also has a TLN4731A number on it). It's quite different than the TPN1110B with its big transformer and capacitor. We always referred to the TPN1095A as "The Switching Supply", but we might have been wrong all along! LJ -Original Message- >From: Eric Lemmon <[EMAIL PROTECTED]> >Sent: Jan 14, 2007 3:44 PM >To: Repeater-Builder@yahoogroups.com >Subject: RE: [Repeater-Builder] Re: Switching Power Supply vs. Astron Etc. > >Jeff, > >That sounds like a plan! And I agree with your and Ken's comment about the >TPN1151A being a linear supply- I checked a MICOR manual to be sure. I seem >to recall that there was a MICOR switch-mode supply, but I can't remember >which Compa-Stations had it installed, or what model number it bore. Old >age is affecting my memory, I guess... > >73, Eric Lemmon WB6FLY > > >-Original Message- >From: Repeater-Builder@yahoogroups.com >[mailto:[EMAIL PROTECTED] On Behalf Of Jeff DePolo >Sent: Sunday, January 14, 2007 3:21 PM >To: Repeater-Builder@yahoogroups.com >Subject: RE: [Repeater-Builder] Re: Switching Power Supply vs. Astron Etc. > >> You have a golden opportunity to provide an extremely >> valuable service to the radio community! If you can obtain >> the use of a wattmeter, you can make a comparison between the >> two power supplies. One such meter is the "KILL A WATT" >> meter that is sold under several brand names. It is >> inexpensive, and accurate enough for our purposes. > >Unless I'm remembering wrong, the TPN1151A was still a ferro supply just >like a TPN1110B. It had some kind of a switching circuit that was specific >to that model (which was the battery backup version power supply for the >Micor), but the main high current supply was still a ferro. At least that's >how I remember it. I can't remember ever having either of those supplies >fail (not even filter caps!) that I've never had to spend much time inside >them, nor their respective manual pages. > >If there's really interest in something like this, I can take both types of >Micor supplies, a GE M2 ferro, an Astron linear, a Duracomm/Iota switcher, >and maybe a few other things I have around and load test them at a few >different current draw points (something like no load, standby @2A, >mid-power transmit @ 15A, and high-power transmit @ 30A) and come up with a >table. I have a Transistor Devices electronic load good for 1000 watts so I >can do this with a fairly high degree of accuracy. I also have a Kill-A-Watt >along with traditional RMS-reading DVM's and amp-clamps too. If there's >interest email me and I'll put it on the ham projects to-do list. > >I'm thinking of a tabulation of input E/I/PF/VA/watts, output E/I/watts, and >efficiency (watts out vs watts out). Would that cover it? > >--- Jeff > >
Re: [Repeater-Builder] Re: Switching Power Supply vs. Astron Etc.
Erick, I agree with you! The only difference will be any increased efficiencies in the switcher over the mag and that will be small. I have had a Master Electrical License for 38 years. A physical law of science says that 746 watts equal 1 horsepower> There is no deviation from that scientific fact. In addition, if the equipment that is powered by the astron, draws 30 amps, it's going to draw 30 amps on the switcher. THAT CANNOT CHANGE> The power supply, both switcher and mag type, will draw the required line current that is demanded by that load. Ohm's law says P=E/I (power ((wattage)) = E((voltage)) divided by the amperage ((I)). If 30 amps are required at 13.8 volts the resultant power consumed will REMAIN THE SAME POWERED BY THE MAG OR SWITCHER SUPPLY. Since this physical law cannot change, then the efficiency differences between the two types of supply will be the ONLY POSSIBLE DECREASE IN CONSUMED ELECTRICITY. Since efficiency is the ONLY POSSIBLE GAIN and the switcher cannot generate electricity and there is no perpetual motion, needed magnetizing current decrease and possible utility current power factor improvements are the ONLY POSSIBLE IMPROVEMENTS THAT CAN OCCUR. If you consider these facts, you will instantly see that utility cost reductions will be minimal at best. Electrical company power charges are calculated in KWH (kilowatt hours). That is calculated by the formula KHW (killer what hours ((hi hi)) = wattage load (both apparent and actual) multiplied by the time used and divided by one thousand. Since the inefficiencies are these SMALL differences, any real electrical cost savings will be in pennies on the monthly bill and that is if the utility apparent wattage is in line with actual use (power factor corrected). As you can see, the only real advantage to the switching supplies are mostly physical. By the way. Accurately measuring these electrical differences with metering equipment can get quite complicated since ac power factor is involved. To correctly measure this you need to correct power factor by using correction capacitors. That is why utility meters have a designed and approved accuracy of 1.5 to 2 percent (this is national standard and regulation required). If anyone believes they are going to save any substantial amount of money by converting to switchers, they are going to be rudely awakened. It would take decades to recoup the cost of such equipment replacements based upon utility savings. One last myth left to clear up. A power supply connected to ac current and left turned on 24/7/365 is the way to insure increased equipment longevity. I have heard many people say they must "turn their power supply off when equipment is not being used to save electricity." NOTHING COULD BE MORE ERRONEOUS. The ONLY electricity being consumed when the load is switched off, is magnetizing current and voltage correction current from leakage etc. Since this is relatively minute, those "significant savings" are nonexistent. Once again we speak of pennies. If you consider the stress caused by switching the power supply on and off many times, in the end you loose. Life expectancy is decreased by in rush, each time the unit is re-energized. I have had Astron mag. supplies functioning for DECADES with no failure. As long as the input is protected by GOOD electronic spike suppression, failure is mostly limited to age or abuse (possible load shorts). I can only hope this helps clear up confusion and to eliminate conjecture regarding these subjects. David R. Henry LME - Original Message - From: "Eric Lemmon" <[EMAIL PROTECTED]> To: Sent: Sunday, January 14, 2007 3:07 PM Subject: RE: [Repeater-Builder] Re: Switching Power Supply vs. Astron Etc. > Larry, > > You have a golden opportunity to provide an extremely valuable service to > the radio community! If you can obtain the use of a wattmeter, you can > make > a comparison between the two power supplies. One such meter is the "KILL > A > WATT" meter that is sold under several brand names. It is inexpensive, > and > accurate enough for our purposes. > > Try measuring the power- both real and apparent- drawn by the same > equipment > while operating on the TPN1110B supply, and again while operating on the > TPN1151A supply. Make a note of all parameters in both the idle state and > while transmitting. I'll be surprised if the energy used by the switcher > is > not much less than the ferro-resonant unit. > > Keep in mind that the utility charges its customers for the consumption of > real power in watts over time, in kWh. In an AC circuit, the independent > measurement of volts and amperes does not equal watts unless the load is > resistive, which is definitely not the case with a power supply. > Therefore, > the measurement of current drawn by each power supply is meaningless, > since > it is not in phase with the voltage. The product of u
Re: [Repeater-Builder] AEA Isopole data needed at repeater-builder... file c...
Negative. AEA has not folded nor did they sell any rights to any of their products to this Spectral company from Argentina. What happened is that the original owner of AEA sold the digital product designs to Timewave and the antenna products to Tempo Corp. including the Isopole, Isoloop, and antenna analyzers. Tempo later sold the product line to a private owner who still owns a significant portion of the company today. Spectral came along about 5 years ago with their stainless steel version of the Isopole and have been boldly marketing it ever since. The current AEA company simply can not afford the legal fees associated with sueing Spectral so they've taken no action. The current AEA has focused on the analyzer products making significant improvements and doing quite well in several markets. I have loads of Isopole info stuffed away. I'll try to find it, scan it, and get it over to Mike. [EMAIL PROTECTED] wrote: > I'm puzzled that these antennas are considered relics because they > are still manufactured by Spectral who apparently bought the > production rights for the Isopole line when AEA folded. See > www.isopole.com.They cost about $120. The tips and integrated network > cost about $60. Opinions regarding this antenna have historically > varied all over the lot. Personally, I think they are well designed. > Their decoupling characteristics are good and they seem to provide > more gain than their specs indicate. I also like the feature that > permits tuning the antenna low SWR point to the TX or RX frequency > desired. They do have the potential for producing noise if you neglect > to use conductive grease when attaching the decoupling elements to the > mast. I do have the documentation on the original Isopoles. My scanner > is non -functional at the moment but I can phone fax it to whoever > needs it.
RE: [Repeater-Builder] Removing MSR2000 from compa-station cabinet
Eric, I did it with a UHF model... to put it into a 60" tall cabinet. You'll need to cut the power supply mounting brackets out of the chassis / cabinet in order to re-install the power supply into your rack. Also, once you get them in the rack, the fit is REAL tight - unless you can install the mount BEHIND the rack. (What happens in the brackets for the power supply wrap around the rack rails, and that "shrinks" the spacing between them, making reinsertion of the power supply a PITA.) Now I have to go back in my memory a bit to recall the removal procedure, so I may be off a bit... However, if I remember correctly, it's pretty straight forward... remove the screws holding it in place and slide it forward. I think it fits into a "channel" on each mounting rail. Once pulled forward (if I remember) I had to lift one side up and kinda twist it out for removal. Be ready - that puppy is HEAVY!! (The sticker on there that warns of it being heavy is no understatement.) If you don't have the manual for the station, it is a wise investment... I believe reprints are still available from Motorola. Mark - N9WYS -Original Message- From: Repeater-Builder@yahoogroups.com On Behalf Of kk2ed Hi all, I am planning on installing an MSR2000 station in an existing 19" rack cabinet, but first need to remove the entire station from the factory "compa-station" cabinet. The control/RF shelf and PA seem straight forward, but the power supply looks like it is fastened somehow from the rear. Anyone here attempt a similar maneuver? Any recommendations or suggestions on how the PS is removed, and how I can expect to mount it into a standard front-fastened 19" rack? Thanks Eric KE2D
RE: [Repeater-Builder] Re: Switching Power Supply vs. Astron Etc.
Jeff, That sounds like a plan! And I agree with your and Ken's comment about the TPN1151A being a linear supply- I checked a MICOR manual to be sure. I seem to recall that there was a MICOR switch-mode supply, but I can't remember which Compa-Stations had it installed, or what model number it bore. Old age is affecting my memory, I guess... 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Jeff DePolo Sent: Sunday, January 14, 2007 3:21 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: Switching Power Supply vs. Astron Etc. > You have a golden opportunity to provide an extremely > valuable service to the radio community! If you can obtain > the use of a wattmeter, you can make a comparison between the > two power supplies. One such meter is the "KILL A WATT" > meter that is sold under several brand names. It is > inexpensive, and accurate enough for our purposes. Unless I'm remembering wrong, the TPN1151A was still a ferro supply just like a TPN1110B. It had some kind of a switching circuit that was specific to that model (which was the battery backup version power supply for the Micor), but the main high current supply was still a ferro. At least that's how I remember it. I can't remember ever having either of those supplies fail (not even filter caps!) that I've never had to spend much time inside them, nor their respective manual pages. If there's really interest in something like this, I can take both types of Micor supplies, a GE M2 ferro, an Astron linear, a Duracomm/Iota switcher, and maybe a few other things I have around and load test them at a few different current draw points (something like no load, standby @2A, mid-power transmit @ 15A, and high-power transmit @ 30A) and come up with a table. I have a Transistor Devices electronic load good for 1000 watts so I can do this with a fairly high degree of accuracy. I also have a Kill-A-Watt along with traditional RMS-reading DVM's and amp-clamps too. If there's interest email me and I'll put it on the ham projects to-do list. I'm thinking of a tabulation of input E/I/PF/VA/watts, output E/I/watts, and efficiency (watts out vs watts out). Would that cover it? --- Jeff
[Repeater-Builder] Re: Switching Power Supply vs. Astron Etc.
> If you use a modern switch-mode power supply from a reputable > manufacturer, you should not have any noise problems. The smart money would be to actually check the supply. I've got some duracomm, astron and a few other current brands that make more broadcast band poop than a new IBOC transmitter. "IBOC" to you non broadcast people is a bad thing for everyone. > Some of the postings allude to "noisy" switching power supplies, > but those problems were common a decade or so ago, not today. Not say I from the man in the back room. (starting to write like O'riley) > I use a Yaesu-branded Samlex switch-mode power supply for my > Yaesu FT-847 HF rig, and I have zero noise from it. You might have found an example of a well made supply. Cheers to Yaesu for doing one right... > My spectrum analyzer shows that it is clean on every Ham > band. I'd be curious to know what type of antenna or probe you used below 30 MHz? Ham bands are not the only location I would be concerned with. But... even a loud - bad switcher doesn't really hose up typical VHF High Band or UHF FM Operation that bad. > I also have several Astron and Duracomm switchers, and they, > too, are free of measurable broadband noise. The noise doesn't have to be broadband... just some unwanted buck-shot where you need/want it least. Sometimes the garbage will hose you up and you don't know it's the reason for poor performance at some other location. Life will go on... cheers, s.
Re: [Repeater-Builder] AEA Isopole data needed at repeater-builder... file c...
I'm puzzled that these antennas are considered relics because they are still manufactured by Spectral who apparently bought the production rights for the Isopole line when AEA folded. See _www.isopole.com_ (http://www.isopole.com) . They cost about $120. The tips and integrated network cost about $60. Opinions regarding this antenna have historically varied all over the lot. Personally, I think they are well designed. Their decoupling characteristics are good and they seem to provide more gain than their specs indicate. I also like the feature that permits tuning the antenna low SWR point to the TX or RX frequency desired. They do have the potential for producing noise if you neglect to use conductive grease when attaching the decoupling elements to the mast. I do have the documentation on the original Isopoles. My scanner is non -functional at the moment but I can phone fax it to whoever needs it.
RE: [Repeater-Builder] Re: Switching Power Supply vs. Astron Etc.
> You have a golden opportunity to provide an extremely > valuable service to the radio community! If you can obtain > the use of a wattmeter, you can make a comparison between the > two power supplies. One such meter is the "KILL A WATT" > meter that is sold under several brand names. It is > inexpensive, and accurate enough for our purposes. Unless I'm remembering wrong, the TPN1151A was still a ferro supply just like a TPN1110B. It had some kind of a switching circuit that was specific to that model (which was the battery backup version power supply for the Micor), but the main high current supply was still a ferro. At least that's how I remember it. I can't remember ever having either of those supplies fail (not even filter caps!) that I've never had to spend much time inside them, nor their respective manual pages. If there's really interest in something like this, I can take both types of Micor supplies, a GE M2 ferro, an Astron linear, a Duracomm/Iota switcher, and maybe a few other things I have around and load test them at a few different current draw points (something like no load, standby @2A, mid-power transmit @ 15A, and high-power transmit @ 30A) and come up with a table. I have a Transistor Devices electronic load good for 1000 watts so I can do this with a fairly high degree of accuracy. I also have a Kill-A-Watt along with traditional RMS-reading DVM's and amp-clamps too. If there's interest email me and I'll put it on the ham projects to-do list. I'm thinking of a tabulation of input E/I/PF/VA/watts, output E/I/watts, and efficiency (watts out vs watts out). Would that cover it? --- Jeff
Re: [Repeater-Builder] AEA Isopole data needed at repeater-builder... file cabinet checking time...
At 11:07 AM 01/14/07, you wrote: >Well - I have a copy - did a scan and saved it. >Sent it to the reflector and the file is too big. > >Ron Replied in private email with an address to send it to. No sense in force-feeding it to 3300 list members, some of which are on dial-up. Thanks Mike WA6ILQ
Re: [Repeater-Builder] AEA Isopole data needed at repeater-builder... file cabinet checking time...
At 04:55 AM 01/14/07, you wrote: >* Mike Morris WA6ILQ <[EMAIL PROTECTED]> [2007 Jan 14 00:23 -0600]: > > > The 220 one is on the repeater-builder web site, but not the 220 or > > 440. Was there a 6m one? > >After reading further, I assume you mean the 2m data sheet is available >and the 220 is needed? > >As far as 6m, I don't recall that one was offered. I only recall 2m, >220, and 440 MHz. Sorry - the fingers typed faster than the brain, or something like that The 2m one is on repeater-builder, I'm looking to add the missing ones... 220 and 440. Mike WA6ILQ
Re: [Repeater-Builder] Switching Power Supply vs. Astron Etc.
Mathew, Ok fine business. Hope it all works fine! God Bless! 73 Dave - Original Message - From: Mathew Quaife To: Repeater-Builder@yahoogroups.com Sent: Sunday, January 14, 2007 7:15 AM Subject: Re: [Repeater-Builder] Switching Power Supply vs. Astron Etc. Dave, Thanks. The only reason I am considering changing is that I can put the 70 amp back into my radio room, since the 100 amp is available. I'm going to try it today and see what it does, see if any noise shows up. As they say, it can't hurt to try. And that the 100 amp is much lighter than the 70 amp. Mathew DaveH <[EMAIL PROTECTED]> wrote: Hi Mathew, If the supply you are using is fine why change? Yes, you would gain some amperage capacity. However, switching supplies are inherently noisy. You could experience problems from these noises. I realize we are not talking about HF. But, it is possible to wind up with a problem you don't have now. If that 50 amp supply is fine, I see no advantage in the change. Dave - Original Message - From: "n9lv" <[EMAIL PROTECTED]> To: Sent: Saturday, January 13, 2007 10:48 AM Subject: [Repeater-Builder] Switching Power Supply vs. Astron Etc. > With all the talk about switching power supplies, I asked a question > but did not really see my answer. Currently I have an Astron 70 Amp > power supply on the repeater system. I have access to a 100 Amp > Audiopipe DSPS10012 switching power supply available for the > repeater. What would be the (dis)advantage of using this power supply > and release the 70 Amp Astron that is in line currently? > > Mathew > > > > > > > > Yahoo! Groups Links > > > > -- Check out the all-new Yahoo! Mail beta - Fire up a more powerful email and get things done faster.
RE: [Repeater-Builder] Re: Switching Power Supply vs. Astron Etc.
How clean are they in the AM broadcast band? -- Original Message -- Received: Sun, 14 Jan 2007 12:55:55 PM CST From: "Eric Lemmon" <[EMAIL PROTECTED]> To: Subject: RE: [Repeater-Builder] Re: Switching Power Supply vs. Astron Etc. > Mathew, > > If you use a modern switch-mode power supply from a reputable manufacturer, > you should not have any noise problems. > > Some of the postings allude to "noisy" switching power supplies, but those > problems were common a decade or so ago, not today. I use a Yaesu-branded > Samlex switch-mode power supply for my Yaesu FT-847 HF rig, and I have zero > noise from it. My spectrum analyzer shows that it is clean on every Ham > band. I also have several Astron and Duracomm switchers, and they, too, are > free of measurable broadband noise. I got far more broadband noise out of > my (former) 900 MHz desktop computer than I do now from any of my > switch-mode power supplies, and that noise was enough to upset a nearby VHF > radio. > > There have been several reviews of switch-mode power supplies published in > QST Magazine, the most recent being in the July 2006 issue. Previous > reviews appeared in the January 2000, September 2000, and September 2002 > issues. Even the least-expensive switch-mode power supply showed no > broadband noise in the Ham bands. As always, YMMV. > > 73, Eric Lemmon WB6FLY > > > -Original Message- > From: Repeater-Builder@yahoogroups.com > [mailto:[EMAIL PROTECTED] On Behalf Of Mathew Quaife > Sent: Sunday, January 14, 2007 10:22 AM > To: Repeater-Builder@yahoogroups.com > Subject: Re: [Repeater-Builder] Re: Switching Power Supply vs. Astron Etc. > > The ojective is not gain amperage, I have plenty of that. This one is > available for free to me, and is brand new. This would release the 70 amp > Astron for use back in the ham shack for all the HF equipment, and would > serve also as a standby. Since the repeater is the only unit in this shack, > unless the noise was present on the repeater, there is nothing else to > suffer noise. The answer to the question has come, however, the final > result will be today when I switch them out and see if it brings any noises > to the repeater. > > Mathew > > >
Re: [Repeater-Builder] Re: Switching Power Supply vs. Astron Etc.
At 11:28 AM 1/14/2007, you wrote: >Would I gain any advantage by changing out my Motorola MICOR >Repeater TPN1110B supplies (the ones with the constant-voltage >transformer) to the TPN1151A Switching power supply? <---What makes you think the TPN1151A is a switcher? Ken -- President and CTO - Arcom Communications Makers of the world famous RC210 Repeater Controller and accessories. http://www.ah6le.net/arcom/index.html Authorized Dealers for Kenwood and Telewave and we offer complete repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net
RE: [Repeater-Builder] Re: Switching Power Supply vs. Astron Etc.
Larry, You have a golden opportunity to provide an extremely valuable service to the radio community! If you can obtain the use of a wattmeter, you can make a comparison between the two power supplies. One such meter is the "KILL A WATT" meter that is sold under several brand names. It is inexpensive, and accurate enough for our purposes. Try measuring the power- both real and apparent- drawn by the same equipment while operating on the TPN1110B supply, and again while operating on the TPN1151A supply. Make a note of all parameters in both the idle state and while transmitting. I'll be surprised if the energy used by the switcher is not much less than the ferro-resonant unit. Keep in mind that the utility charges its customers for the consumption of real power in watts over time, in kWh. In an AC circuit, the independent measurement of volts and amperes does not equal watts unless the load is resistive, which is definitely not the case with a power supply. Therefore, the measurement of current drawn by each power supply is meaningless, since it is not in phase with the voltage. The product of unsynchronized measurements of volts and amps in an AC circuit is VA, not watts, and will differ from watts depending upon the power factor. But, I digress... Just the watts consumed by each power supply in standby and transmit modes will be important to know. Once you see the difference, you may be inclined to stick with the switch-mode power supply- especially if you are paying for power. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Sunday, January 14, 2007 11:28 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Switching Power Supply vs. Astron Etc. Would I gain any advantage by changing out my Motorola MICOR Repeater TPN1110B supplies (the ones with the constant-voltage transformer) to the TPN1151A Switching power supply? I have a few spares of each type, but most of my MICOR Repeaters came with the 1110B supply installed. I don't know why there were two types of supplies offered with the MICOR Repeater/Base Station radios. The switching supplies seem to be very quiet (even around an HF radio), as far as I have been able to determine. Some of the MICOR service manuals have sections for both supplies, to cover the particular unit that was supplied with the user's station. LJ
Re: [Repeater-Builder] Re: Switching Power Supply vs. Astron Etc.
Would I gain any advantage by changing out my Motorola MICOR Repeater TPN1110B supplies (the ones with the constant-voltage transformer) to the TPN1151A Switching power supply? I have a few spares of each type, but most of my MICOR Repeaters came with the 1110B supply installed. I don't know why there were two types of supplies offered with the MICOR Repeater/Base Station radios. The switching supplies seem to be very quiet (even around an HF radio), as far as I have been able to determine. Some of the MICOR service manuals have sections for both supplies, to cover the particular unit that was supplied with the user's station. LJ -Original Message- >From: skipp025 <[EMAIL PROTECTED]> >Sent: Jan 14, 2007 9:09 AM >To: Repeater-Builder@yahoogroups.com >Subject: [Repeater-Builder] Re: Switching Power Supply vs. Astron Etc. > > >> If the supply you are using is fine why change? Yes, you >> would gain some amperage capacity. > >Relative example... >A room full of Motorola Repeater Stations in non constant >service costs about $30/month each to operate. Put the repeater >into lock to talk mode (IRLP or Echolink) and the energy cost >rises by almost a third (typical). > >One of the energy soaks is the well designed and constructed >transformers within the repeater power supplies. > >Replacing the hungry Motorhead Power Supplies cuts at least >1/2 off the power bill, which is much nicer when you're the one >having to pay it. > >> However, switching supplies are inherently noisy. You >> could experience problems from these noises. I realize >> we are not talking about HF. But, it is possible to wind >> up with a problem you don't have now. > >Many of the common 13.8 vdc switchers sold to the ham market >will hose up at least the 160 meter ham band no problem, which >is just above the am broadcast band I have on the shop when >XM is stale. > >> If that 50 amp supply is fine, I see no advantage in the change. >> Dave > >Cheers Dave, >skipp > >
[Repeater-Builder] Where to connect An GM300 uhf to an MSR2000 VHF
hi all well i am looking for some information,guidance here. i just baught a used,but clean,GM300 UHF that i want to connect on my repeater an MSR2000 VHF low split . on my repeater i have a big rectangular connector geting out of here ,about 1.5 x 3 inches this repeater was connected at an other one that was a link MSR2000 on an other frequency. i dont have the pinnout of the connector. is there anyone that have already connected an Moto GM300 UHF on a MSR??? on the rear of the gM there is a rectangular connector with some pin,,i suppose i should take my audio there and ptt condition thanks for your help ,if anyone have any picture i would appreciate 73/s gervais ve2ckn bic,quebec _ http://www.initiesyouthography.com/R.aspx?a=117
Re: [Repeater-Builder] AEA Isopole data needed at repeater-builder... file cabinet checking time...
Well - I have a copy - did a scan and saved it. Sent it to the reflector and the file is too big. Ron
RE: [Repeater-Builder] Re: Switching Power Supply vs. Astron Etc.
That is perfectly understandable Plus, as someone else mentioned, the switcher will save you money. Richard, N7TGB -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of Mathew Quaife Sent: Sunday, January 14, 2007 10:22 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Switching Power Supply vs. Astron Etc. The ojective is not gain amperage, I have plenty of that. This one is available for free to me, and is brand new. This would release the 70 amp Astron for use back in the ham shack for all the HF equipment, and would serve also as a standby. Since the repeater is the only unit in this shack, unless the noise was present on the repeater, there is nothing else to suffer noise. The answer to the question has come, however, the final result will be today when I switch them out and see if it brings any noises to the repeater. Mathew skipp025 <[EMAIL PROTECTED]> wrote: > If the supply you are using is fine why change? Yes, you > would gain some amperage capacity. Relative example... A room full of Motorola Repeater Stations in non constant service costs about $30/month each to operate. Put the repeater into lock to talk mode (IRLP or Echolink) and the energy cost rises by almost a third (typical). One of the energy soaks is the well designed and constructed transformers within the repeater power supplies. Replacing the hungry Motorhead Power Supplies cuts at least 1/2 off the power bill, which is much nicer when you're the one having to pay it. > However, switching supplies are inherently noisy. You > could experience problems from these noises. I realize > we are not talking about HF. But, it is possible to wind > up with a problem you don't have now. Many of the common 13.8 vdc switchers sold to the ham market will hose up at least the 160 meter ham band no problem, which is just above the am broadcast band I have on the shop when XM is stale. > If that 50 amp supply is fine, I see no advantage in the change. > Dave Cheers Dave, skipp -- We won't tell. Get more on shows you hate to love (and love to hate): Yahoo! TV's Guilty Pleasures list.
RE: [Repeater-Builder] Re: Switching Power Supply vs. Astron Etc.
Mathew, If you use a modern switch-mode power supply from a reputable manufacturer, you should not have any noise problems. Some of the postings allude to "noisy" switching power supplies, but those problems were common a decade or so ago, not today. I use a Yaesu-branded Samlex switch-mode power supply for my Yaesu FT-847 HF rig, and I have zero noise from it. My spectrum analyzer shows that it is clean on every Ham band. I also have several Astron and Duracomm switchers, and they, too, are free of measurable broadband noise. I got far more broadband noise out of my (former) 900 MHz desktop computer than I do now from any of my switch-mode power supplies, and that noise was enough to upset a nearby VHF radio. There have been several reviews of switch-mode power supplies published in QST Magazine, the most recent being in the July 2006 issue. Previous reviews appeared in the January 2000, September 2000, and September 2002 issues. Even the least-expensive switch-mode power supply showed no broadband noise in the Ham bands. As always, YMMV. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Mathew Quaife Sent: Sunday, January 14, 2007 10:22 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Switching Power Supply vs. Astron Etc. The ojective is not gain amperage, I have plenty of that. This one is available for free to me, and is brand new. This would release the 70 amp Astron for use back in the ham shack for all the HF equipment, and would serve also as a standby. Since the repeater is the only unit in this shack, unless the noise was present on the repeater, there is nothing else to suffer noise. The answer to the question has come, however, the final result will be today when I switch them out and see if it brings any noises to the repeater. Mathew
Re: [Repeater-Builder] Re: E-prom Reader-Writer for Phoenix
I also agree that the KG4LNE programmer is very good. Bob is excellent with support as well. He keeps adding new features to the software and is on top of bug fixes. - Rob ve1aic wrote: > I agree Rick the kg4lne programmer is best. I bought the bare board > and software 2 yrs ago and works 100%. All parts were cheap and > available from Digi-Key. > Great to have a solid program that works on XP and can save multiple > configurations with comments in each memory channel...very handy. > > I see he is working on a 2212 emulator as well since the old EEproms > are getting hard to find. > 73, Ron > VE1AIC > > > > --- In Repeater-Builder@yahoogroups.com, "Rick & Charlotte" > <[EMAIL PROTECTED]> wrote: > >>http://www.rtzaudio.com/kg4lne/ >> >>He makes a better programmer and WINDOWS software ! >> >>I looked at different programmers .. his is by the best IMO >> >>Rick >> >>On 12 Jan 2007 at 12:16, [EMAIL PROTECTED] wrote: >> >> >>>I use a programmer I bought from RFGUYS on Ebay. I have programmed >>>Phoenix and Rangr radios with it so far. You have to remove the > > EEPROM > >>> from the radio and plug it into a small board plugged into the > > parallel > >>>port of a DOS computer, but it works like a charm. I have been >>>programming EEPROMS with mine, and only require someone sending along >>>the EEPROM and return postage to program one. Drop me a note if > > you are > >>>interested. >>> >>>73 - Jim W5ZIT >>> >>>-Original Message- >>>From: [EMAIL PROTECTED] >>>To: Repeater-Builder@yahoogroups.com >>>Sent: Fri, 12 Jan 2007 10:50 AM >>>Subject: [Repeater-Builder] E-prom Reader-Writer for Phoenix >>> >>>Looking for an inexpensive way to program my Phoenix Radios. >>>Yes Im Frugile. (better word than Cheap)Would be nice to find someone >>>willing to part with the Suitcase Programmer, but they are Scarce & >>>Expensive.Heres Hoping. >>> >>>Wesley AB8KD >>> > >
Re: [Repeater-Builder] Re: Switching Power Supply vs. Astron Etc.
The ojective is not gain amperage, I have plenty of that. This one is available for free to me, and is brand new. This would release the 70 amp Astron for use back in the ham shack for all the HF equipment, and would serve also as a standby. Since the repeater is the only unit in this shack, unless the noise was present on the repeater, there is nothing else to suffer noise. The answer to the question has come, however, the final result will be today when I switch them out and see if it brings any noises to the repeater. Mathew skipp025 <[EMAIL PROTECTED]> wrote: > If the supply you are using is fine why change? Yes, you > would gain some amperage capacity. Relative example... A room full of Motorola Repeater Stations in non constant service costs about $30/month each to operate. Put the repeater into lock to talk mode (IRLP or Echolink) and the energy cost rises by almost a third (typical). One of the energy soaks is the well designed and constructed transformers within the repeater power supplies. Replacing the hungry Motorhead Power Supplies cuts at least 1/2 off the power bill, which is much nicer when you're the one having to pay it. > However, switching supplies are inherently noisy. You > could experience problems from these noises. I realize > we are not talking about HF. But, it is possible to wind > up with a problem you don't have now. Many of the common 13.8 vdc switchers sold to the ham market will hose up at least the 160 meter ham band no problem, which is just above the am broadcast band I have on the shop when XM is stale. > If that 50 amp supply is fine, I see no advantage in the change. > Dave Cheers Dave, skipp - We won't tell. Get more on shows you hate to love (and love to hate): Yahoo! TV's Guilty Pleasures list.
[Repeater-Builder] Removing MSR2000 from compa-station cabinet
Hi all, I am planning on installing an MSR2000 station in an existing 19" rack cabinet, but first need to remove the entire station from the factory "compa-station" cabinet. The control/RF shelf and PA seem straight forward, but the power supply looks like it is fastened somehow from the rear. Anyone here attempt a similar maneuver? Any recommendations or suggestions on how the PS is removed, and how I can expect to mount it into a standard front-fastened 19" rack? Thanks Eric KE2D
[Repeater-Builder] Re: Switching Power Supply vs. Astron Etc.
Re: Switching Power Supply vs. Astron Etc. Hi Jim, > I am concerned about noise from even the top line switching > supplies to my equipment and the other equipment in the tower > site. Probably easier to say each case will be different. Some supplies do operate at tower sites and no one wants to operate an HF Remote Base or AM Broadcast Monitor Radio. Sometimes the supply rfi radiation is not that bad and is well contained within a repeater cabinet. There are many good switchers available and used... just a question of how much and where (spectral wise) any radiation happens. You might audition the supply near an HF Radio if you ever expect to use and HF Remote base. > I have heard it said that placing a battery (over the supply, on > the supply, somewhere) will remove any of the noise. In your > experience does this work and if so how is the battery configured > on say a 70 amp switching supply? > Thanks JIM KA2AJH Well... a battery has an impedance that presents a load to noise and rfi. Some batteries make a difference and some batteries with higher internal impedance might not change anything. Might not even be the rfi antenna/culprit/source. Also consider the wire from the supply to any batteries might make a nice antenna. The better thought would be to use proper (complete) supply shielding and lead bypass. cheers, skipp
[Repeater-Builder] Re: VHF MSR 2000
Re: VHF MSR 2000 There are actually at least three vhf ranges in the MSR family. Depending on the specific model and duty cycle you'd need to check the numbers against the book chart. The receiver is the first thing to check... there are high range versions that don't come down into the ham bands without serious (pain in the @$$) mods. Most of the transmitters will do the entire range without mods... just the proper alignment. The PA should first be checked by the book/manual for the band range and by asking various people (with serious msr experience) for their thoughts. Almost every MSR VHF PA will work down into the ham band turned down. Some models and versions adjusted down a lot (75%) ... some at nominal values. There are so many different models of the PA it's probably easier to get the actual model number and also write down the receiver model and check them with the book AND an "msr person". Most flying blind msr people convert the commerical units down to the ham bands only to trash the power amplifier by running it well above the de-rated out-of-band range values (power level). Smart to see you asking the questions first... cheers, skip > > I have an opportunity to acquire a MSR 2000 VHF base station > > that is currently channeled for 159.075 Mhz. I'd like to > > convert it to a 2 meter base station on 146.895 Mhz. Can > > this be done? I think I read where there was 2 different > > "splits" for this radio, a VHF model on the "low end" and > > one on the "high" end. > > Thanks for any information you can provide.
Re: [Repeater-Builder] AEA Isopole data needed at repeater-builder... file cabinet checking time...
At 1/13/2007 22:21, you wrote: >Does anybody have the AEA Isopole 220mhz and 440 data sheet (the one >that was packed inside the box) ?? > >The 220 one is on the repeater-builder web site, but not the 220 or >440. Was there a 6m one? > >This request came about due to an email from a gentleman who has a >virgin 220mhz one except that the box was opened, and shelved. He >bought it (and an Icom 03AT) at a garage sale and the data sheet is missing. I also have a 220 Isopole but no data sheet. Never needed it, though. AFAIK the upper decoupling cone mounts at the top of the mast near the feedpoint, & the 2nd cone mounts at the bottom of the 1st. Then again, maybe I'm wrong & that's why that antenna never worked worth a darn. Bob NO6B
RE: [Repeater-Builder] Re: Switching Power Supply vs. Astron Etc.
Hi Skipp, I am concerned about noise from even the top line switching supplies to my equipment and the other equipment in the tower site. I have heard it said that placing a battery (over the supply, on the supply, somewhere) will remove any of the noise. In your experience does this work and if so how is the battery configured on say a 70 amp switching supply? Thanks JIM KA2AJH _ From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of skipp025 Sent: Sunday, January 14, 2007 12:10 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Switching Power Supply vs. Astron Etc. > If the supply you are using is fine why change? Yes, you > would gain some amperage capacity. Relative example... A room full of Motorola Repeater Stations in non constant service costs about $30/month each to operate. Put the repeater into lock to talk mode (IRLP or Echolink) and the energy cost rises by almost a third (typical). One of the energy soaks is the well designed and constructed transformers within the repeater power supplies. Replacing the hungry Motorhead Power Supplies cuts at least 1/2 off the power bill, which is much nicer when you're the one having to pay it. > However, switching supplies are inherently noisy. You > could experience problems from these noises. I realize > we are not talking about HF. But, it is possible to wind > up with a problem you don't have now. Many of the common 13.8 vdc switchers sold to the ham market will hose up at least the 160 meter ham band no problem, which is just above the am broadcast band I have on the shop when XM is stale. > If that 50 amp supply is fine, I see no advantage in the change. > Dave Cheers Dave, skipp
[Repeater-Builder] Re: Switching Power Supply vs. Astron Etc.
> If the supply you are using is fine why change? Yes, you > would gain some amperage capacity. Relative example... A room full of Motorola Repeater Stations in non constant service costs about $30/month each to operate. Put the repeater into lock to talk mode (IRLP or Echolink) and the energy cost rises by almost a third (typical). One of the energy soaks is the well designed and constructed transformers within the repeater power supplies. Replacing the hungry Motorhead Power Supplies cuts at least 1/2 off the power bill, which is much nicer when you're the one having to pay it. > However, switching supplies are inherently noisy. You > could experience problems from these noises. I realize > we are not talking about HF. But, it is possible to wind > up with a problem you don't have now. Many of the common 13.8 vdc switchers sold to the ham market will hose up at least the 160 meter ham band no problem, which is just above the am broadcast band I have on the shop when XM is stale. > If that 50 amp supply is fine, I see no advantage in the change. > Dave Cheers Dave, skipp
Re: [Repeater-Builder] AEA Isopole data needed at repeater-builder... file cabinet checking time...
* Mike Morris WA6ILQ <[EMAIL PROTECTED]> [2007 Jan 14 00:23 -0600]: > The 220 one is on the repeater-builder web site, but not the 220 or > 440. Was there a 6m one? After reading further, I assume you mean the 2m data sheet is available and the 220 is needed? As far as 6m, I don't recall that one was offered. I only recall 2m, 220, and 440 MHz. > With as many Isopoles that are out there I would imaging that a > repair article would be worth it. How about repairing one blown apart by lightning? I have one! In fact, I just recoverd the stinger a few weeks ago after it finally worked its way through the mast a few yeara after getting hit. The connector is still on the end of the coax hanging off the tower and the mast and cones are still up there. So far I've not gotten around to removing it. Maybe this year? I did pick up most of a new one in a box at a hamfest a couple of years ago. Has anyone bought one from the company that's offering them now? I saw an ad for them on eham.net the other day. 73, de Nate >> -- Wireless | Amateur Radio Station N0NB | Successfully Microsoft Amateur radio exams; ham radio; Linux info @ | free since January 1998. http://www.qsl.net/n0nb/ | "Debian, the choice of My Kawasaki KZ-650 SR @| a GNU generation!" http://www.networksplus.net/n0nb/ | http://www.debian.org
Re: [Repeater-Builder] Mastr II 6' Metering panel wanted
Hi- Was one on E-Bay ,yesterday -Mastrll use name.Jerry Don Wisdom <[EMAIL PROTECTED]> wrote: Hi All, Im looking to purchase 1 or 2 6' GE cabinet metering panels my timeframe to purchase is at the end of the month. Please advise if you have any thing available Thanks --Don KD7WKF - Finding fabulous fares is fun. Let Yahoo! FareChase search your favorite travel sites to find flight and hotel bargains.
Re: [Repeater-Builder] Switching Power Supply vs. Astron Etc.
Dave, Thanks. The only reason I am considering changing is that I can put the 70 amp back into my radio room, since the 100 amp is available. I'm going to try it today and see what it does, see if any noise shows up. As they say, it can't hurt to try. And that the 100 amp is much lighter than the 70 amp. Mathew DaveH <[EMAIL PROTECTED]> wrote: Hi Mathew, If the supply you are using is fine why change? Yes, you would gain some amperage capacity. However, switching supplies are inherently noisy. You could experience problems from these noises. I realize we are not talking about HF. But, it is possible to wind up with a problem you don't have now. If that 50 amp supply is fine, I see no advantage in the change. Dave - Original Message - From: "n9lv" <[EMAIL PROTECTED]> To: Sent: Saturday, January 13, 2007 10:48 AM Subject: [Repeater-Builder] Switching Power Supply vs. Astron Etc. > With all the talk about switching power supplies, I asked a question > but did not really see my answer. Currently I have an Astron 70 Amp > power supply on the repeater system. I have access to a 100 Amp > Audiopipe DSPS10012 switching power supply available for the > repeater. What would be the (dis)advantage of using this power supply > and release the 70 Amp Astron that is in line currently? > > Mathew > > > > > > > > Yahoo! Groups Links > > > > - Check out the all-new Yahoo! Mail beta - Fire up a more powerful email and get things done faster.
