Re: [Repeater-Builder] Mystery Signal
The other way you could help rule out anything on that tower would be to get a list of the transmitters there and listen to their frequency and compare when you're hearing the interference. Make take a day or two to get through them all, but that should help. i.e. Scanner or extra receiver tuned to example 151.085 at the :53 transmission, nothing heard and no key up during that time, move on to the next frequency and listen at the :23 transmission, etc. If the tower owner knows they are running a data specific type system that would be the one to start with. If you don't want to bug him again, start with a search of the FCC database for those coordinates. http://www.fcc.gov click on search, etc. You can enter the lat/lon and a radius around and list out the transmitters. Chuck n0nhj Scott Overstreet wrote: Hello All Many thanks to all of you who have responded to my call for help in identifing our Mystery Signal--all of your comments and especially the signal analysis work done by Rodger, Nate, Joe and others are helping with our task. Please keep up the effort as we have not found our signal yet. Preliminary Doppler DF work has us surounding a large scale municiple tower with what we have labled our area of uncertainitya half mile diameter circle or so. Distant vectors from clear areas converge there but close in vectors disperce in almost all directions apparently due to reflections from tall buildings, cars, metel doors, roofs etc.. We are now rounding up a team of experienced DF'ers with other techniques. I have succeded in making contact with the guy that is responsible for the Motorola gear on the towerhe says that our signal isn't comming from any of his stuff but that there is other gear in the radio room and that he will look it over while monitoring by service monitor---a start there. From your responses so far, it sounds like we may well be looking for a piece of ham gear that is mistakenly on our repeater inputwith this we will get back into the neighborhoods around the tower for a new look and spread the word through the packet guys. Again, many thanks to all of you-I'll keep you informed. Scott No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.409 / Virus Database: 268.15.18/585 - Release Date: 12/13/2006
Re: [Repeater-Builder] Mystery Signal
In case I confused anybody, this is what I am refering to with APRS and a 100hz tone --- VOICE ALERT: This simply means that you do not turn the audio down on 144.39, but instead leave it at high volume and then simply set CTCSS tone 100 to mute the speaker. This way, you dont hear any packets, but ANYONE can call you with VOICE on 144.39 to alert you by using PL 100. You will rarely use this, and only use it to tell someone to QSY to another voice channel, but it is one way of assuring that ANYONE running APRS in simplex range of you can ALWAYS be contacted with a voice call... You wont hear any packets except maybe one or two when another VOICE- ALERT mobile is in range (about 3 miles or so). But even then, he is only beaconing once every 2 minutes and so it is not bothersome at all.. In fact, it is nice to hear when someone is nearby! Its like a free radar for other mobile APRS operators that are in simplex range AND listening. --- --- Max Slover [EMAIL PROTECTED] wrote: Doh, this just hit me. It would most definitely be an APRS setup due to the 100hz subtone. In APRS you set the subtone to 100 so you can do voice alert. Man, why didn't I think of that part when this was first mentioned. Sorry for being a bit late on that but I figured I'd toss my 2 cents on this. Max... Public Information Officer -- St. Louis Suburban Radio Club K0AZV - Amateur WPWH-650 GMRS St. Louis County ARES St. Ann MO EM48tr
[Repeater-Builder] Midland transmitter and receiver
Hello, all, I am looking for a set of TCXO's for the Midland UHF BaseTech repeater transmitter, 71-5051B, and the receiver 71-5052B. If no one has a spare set, I would consider the complete exciter and receiver, but these will need to have the TCXO's included. Contact me off list with info on what you have, at [EMAIL PROTECTED]mailto:[EMAIL PROTECTED]. Dennis Bridgeman KC0FWN Bridgeman Communications 202 Seventh Street Carmi, Illinois 62821 http://bridgemancommunications.comhttp://bridgemancommunications.com/
[Repeater-Builder] Re: Mirage D1010 Amp for ATV repeaters?
Hi Roger! Thanks for the info. Bit of bad news on this actually. We sold our old PA to help fund the new one. I received an Email from the guy we were going to buy from in the US who now says he has found another buyer. :( So our repeater is currently off air until we can find another. So if you hear of any around the $100 mark, please let us know. Regards, Ken .-.-. --- In Repeater-Builder@yahoogroups.com, [EMAIL PROTECTED] wrote: We used one of these amps on our ATV repeater that re-transmitted Weather Radar images for many, many years in the Dallas/Ft. Worth area and had no failures that I remember. We transmitted into a circulator prior to the antenna, a 5 dB omni vertical, which was over 900 feet above the ground. Best I remember, we used it near its max. power out limit, backing off a little. Roger W5RD From: Ken [EMAIL PROTECTED] Date: 2006/12/13 Wed AM 07:23:55 CST To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Mirage D1010 Amp for ATV repeaters? Giday! Has anyone had any experience using the Mirage D1010 amps for 70cm ATV? I'm looking at getting a bigger amp for our local ATV repeater and the older versions of these amps seem to be fairly plentiful second hand in the US. I believe there are a few different versions of this amp, so I would be interested to hear how they vary internally and in application. Also how to tell the difference between them by their outside appearance. Another reason I am looking at these is that I am led to believe that they use the MRF646 to drive a pair of MRF648 's. We have a few spares of these particular transistors so this would be handy also for future maintanance. Oh also what is a good price for these amps second hand in good condition? Regards, Ken - VK4AKP .-.-. Roger White Murphy, Texas
[Repeater-Builder] Re: Micor compa-station Manual
Bob, I got your copies. They look great. Thanks alot 73, N3GH George --- In Repeater-Builder@yahoogroups.com, Bob M. [EMAIL PROTECTED] wrote: I've got that exact manual and will scan the two pages and e-mail them to you. What I don't find is a photo showing the tuned components; they're present for the exciter but not for the receiver. If you have the metal shield on the receiver, I think that has the component labels on it. Bob M. == --- n3gh_1 [EMAIL PROTECTED] wrote: Wonder if anyone has a spare manual for the Micor Compa-station? P/N of the one I need is the 68P81025E50. THis has the alighment instrucgtions for the TLE8032B receiver and the TLE8023B Filter. Thanks N3GH George (W3BD Repeater) Want to start your own business? Learn how on Yahoo! Small Business. http://smallbusiness.yahoo.com/r-index
[Repeater-Builder] Re: 6M duplexer wanted in UK
Are you saying that a duplexer built from heliax can cope with a 0.5MHz plit at any temperature?I somehow doubt it (no invar!) Cheers Dave UZN --- In Repeater-Builder@yahoogroups.com, Matt Beasant [EMAIL PROTECTED] wrote: Hi Steve, The 'FH duplexer was built by a very good friend, who doesn't want to build another one!!! But yes, it was built from LDF7-50 1 -5/8 Heliax. Matt - Original Message - From: Steve To: Repeater-Builder@yahoogroups.com Sent: Wednesday, December 06, 2006 5:14 PM Subject: Re: [Repeater-Builder] 6M duplexer wanted in UK Hi Matt What size heliax did you use, I seem to remember that it was built for you, wasn't it. I tried myself with small dia stuff and it was not very good, went slightly off tune and of course rx desense. As I have said, itmay just have been the cable I used. 73 Steve - Original Message - From: Matt Beasant To: Repeater-Builder@yahoogroups.com Sent: Wednesday, December 06, 2006 4:06 PM Subject: Re: [Repeater-Builder] 6M duplexer wanted in UK My heliax duplexer has been in service now for over 2 years at GB3FH without fault or need to re-adjust. I check it every time I visit site and it never moves! Over 85dB rejection on one side and 90 odd dB on the other, works fine for me. You can see pictures of it at www.gb3fh.org.uk Regards, Matt, G4RKY --- Steve [EMAIL PROTECTED] wrote: Hi don't get me wrong, Iam not condeming heliax duplexers totaly, but you have to take into account reliability once on site. I did make one but had to scrap it as it was so unreliable causing de sense etc, and every time I had to look at it I had to make arragements to access the site, which could take upto 2 weeks, must point out the one I made used small dia heliax, maybe larger dia would be OK but as I can't get any, I don't know Anyway had my say so end of thread from me Steve - Original Message - From: Barry C' To: Repeater-Builder@yahoogroups.com Sent: Wednesday, December 06, 2006 11:25 AM Subject: Re: [Repeater-Builder] 6M duplexer wanted in UK Being a fan to the exclusion of saving several hundred quid is rather silly when the duplexers work well and are generally quite efficient . From: Steve [EMAIL PROTECTED] Reply-To: Repeater-Builder@yahoogroups.com To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] 6M duplexer wanted in UK Date: Wed, 6 Dec 2006 11:07:54 - Hi think you will find that Dave, like me, isn't a huge fan of Heliax duplexers, see my posts about actualy getting hold of ldf 750 73 Steve - Original Message - From: Mr John Lloyd To: [EMAIL PROTECTED] ; repeater-builder@yahoogroups.com ; John Lloyd Sent: Wednesday, December 06, 2006 6:56 AM Subject: [Repeater-Builder] 6M duplexer wanted in UK Dave, You can build your own 6 Mtr duplexer. Find some 1-5/8 heliax and put one together. Look at http://www.wa7x.com/ki7dx_rpt.html Thanks, John, K7JL Utah VHF Society http://utahvhfs.org/snowlink.html 1a. 6M duplexer wanted in UK Posted by: dave_g7uzn [EMAIL PROTECTED] dave_g7uzn Date: Tue Dec 5, 2006 3:20 am ((PST)) Hi All, Is anyone with a set of cavity filters suitable for 50/51MHz brave enough to sell them to me and get them shipped to the UK for a 6M repeater project? ALL expences will of course be covered. If you can help please email me direct at [EMAIL PROTECTED] __ Need a quick answer? Get one in minutes from people who know. Ask your question on www.Answers.yahoo.com -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.15.9/573 - Release Date: 12/5/2006 4:07 PM __ Advertisement: It's simple! Sell your car for just $20 at carsales.com.au http://a.ninemsn.com.au/b.aspx?URL=http%3A%2F%2Fsecure%2Dau% 2Eimrworldwide%2Ecom%2Fcgi%2Dbin%2Fa%2Fci%5F450304%2Fet%5F2%2Fcg% 5F801577%2Fpi%5F1005244%2Fai% 5F838588_t=757768878_r=endtext_simple_m=EXT
RE: [Repeater-Builder] Newbie Information Time - Mystery Signal
Neil, As always, good post. Hey, stay dry out there if you can! Paul -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Thursday, December 14, 2006 10:34 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Newbie Information Time - Mystery Signal I guess it is time again for a bit of clarification for the apparent newbies: PL ... is a registered trademark of Motorola Inc. properly known as Private Line. A very polite way of saying the same thing here is Continuous Tone Coded Squelch System or CTCSS. The following is for all but specfically Mike Morris as well: The reference to hz is also incorrect ... as is an abbreviation of Hertz, a persons last name. Specifically should be Hz. In my opinion, is a slight flaw in the voice operation on 144.39 MHz below ... the FCC requires you to monitor the frequency in a non-CTCSS mode prior to transmitting. And, if you have your 144.39 MHz receiver locked up on CTCSS decode, your receiver won't hear the packet operations ... Thank you for your time, Neil McKie - WA6KLA - Original Message - From: Max Slover [EMAIL PROTECTED] Date: Wednesday, December 13, 2006 4:58 pm Subject: Re: [Repeater-Builder] Mystery Signal In case I confused anybody, this is what I am refering to with APRS and a 100hz tone --- VOICE ALERT: This simply means that you do not turn the audio down on 144.39, but instead leave it at high volume and then simply set CTCSS tone 100 to mute the speaker. This way, you dont hear any packets, but ANYONE can call you with VOICE on 144.39 to alert you by using PL 100. You will rarely use this, and only use it to tell someone to QSY to another voice channel, but it is one way of assuring that ANYONE running APRS in simplex range of you can ALWAYS be contacted with a voice call... You wont hear any packets except maybe one or two when another VOICE- ALERT mobile is in range (about 3 miles or so). But even then, he is only beaconing once every 2 minutes and so it is not bothersome at all.. In fact, it is nice to hear when someone is nearby! Its like a free radar for other mobile APRS operators that are in simplex range AND listening. --- --- Max Slover [EMAIL PROTECTED] wrote: Doh, this just hit me. It would most definitely be an APRS setup due to the 100hz subtone. In APRS you set the subtone to 100 so you can do voice alert. Man, why didn't I think of that part when this was first mentioned. Sorry for being a bit late on that but I figured I'd toss my 2 cents on this. Max... Public Information Officer -- St. Louis Suburban Radio Club K0AZV - Amateur WPWH-650 GMRS St. Louis County ARES St. Ann MO EM48tr Yahoo! Groups Links Yahoo! Groups Links
[Repeater-Builder] 6M cans still wanted in the UK
Hi All, I rescently posted that I need a set of 6M cans for a repeater project in the UK. Despite one offer that appears to have fizzled out. Is anyone prepared to sell me some high quality cans and ship them to the UK? All expences paid. Thanks in advance..Cheers Dave UZN
[Repeater-Builder] Micor 800MHz Base Stations?
Did Motorola ever make a Micor or earlier vintage base station with a tube PA on 800MHz? -- Kris Kirby [EMAIL PROTECTED]
RE: [Repeater-Builder] Micor 800MHz Base Stations?
Kris, I have no idea about a tube version... but I have a Micor 75W solid state PA for 800 if you are interested lemme know.. 73 Mike Perryman www.k5jmp.us -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of Kris Kirby Sent: Thursday, December 14, 2006 4:48 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Micor 800MHz Base Stations? Did Motorola ever make a Micor or earlier vintage base station with a tube PA on 800MHz? -- Kris Kirby [EMAIL PROTECTED] Yahoo! Groups Links
RE: [Repeater-Builder] Micor 800MHz Base Stations?
On Thu, 14 Dec 2006, Mike Perryman wrote: I have no idea about a tube version... but I have a Micor 75W solid state PA for 800 if you are interested lemme know.. Not really. What I'm thinking is that a tube-type PA would have less noise generated as a result of amplification which would mean less heat expended in the duplexers and harmonic filters. -- Kris Kirby [EMAIL PROTECTED]
RE: [Repeater-Builder] Micor 800MHz Base Stations?
Yes they did, I think they all had tube PA's at the start, well except Quintron. Paul -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Mike Perryman Sent: Thursday, December 14, 2006 4:04 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Micor 800MHz Base Stations? Kris, I have no idea about a tube version... but I have a Micor 75W solid state PA for 800 if you are interested lemme know.. 73 Mike Perryman www.k5jmp.us -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of Kris Kirby Sent: Thursday, December 14, 2006 4:48 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Micor 800MHz Base Stations? Did Motorola ever make a Micor or earlier vintage base station with a tube PA on 800MHz? -- Kris Kirby [EMAIL PROTECTED] Yahoo! Groups Links Yahoo! Groups Links
RE: [Repeater-Builder] Micor 800MHz Base Stations?
--- Kris Kirby [EMAIL PROTECTED] wrote: On Thu, 14 Dec 2006, Mike Perryman wrote: I have no idea about a tube version... but I have a Micor 75W solid state PA for 800 if you are interested lemme know.. Not really. What I'm thinking is that a tube-type PA would have less noise generated as a result of amplification which would mean less heat expended in the duplexers and harmonic filters. -- Kris Kirby [EMAIL PROTECTED] Even if a solid state TX at 100 watts only had the spurious and harmonics down 20dB, that would only be 1 watt of additional heat generated. Most transmitters have such things reduced by at least 60dB, which would make the additional heat generated at something less than a milliwatt, hardly worth mentioning. The heat comes from the loss of the device. A 1 dB loss will introduce about 20 watts of heat from a 100 watt TX. Joe Do you Yahoo!? Everyone is raving about the all-new Yahoo! Mail beta. http://new.mail.yahoo.com
[Repeater-Builder] tripp lite pr-25
Hi all Looking for a schematic for a PR-25 tripp lite power supply. Can anyone help? Contact me off list at va2ir at securenet dot net Thanks 73 Ian
Re: [Repeater-Builder] Newbie Information Time - Mystery Signal
At 12/14/2006 08:34 AM, you wrote: In my opinion, is a slight flaw in the voice operation on 144.39 MHz below ... the FCC requires you to monitor the frequency in a non-CTCSS mode prior to transmitting. Not quite. The FCC requires you to make sure the frequency is not in use before TXing, the idea being you don't interfere with communications in progress on said frequency. Packet, by design, automatically monitors the frequency so as to minimize collisions. If on occasion you accidentally stomp on a packet, no biggie: it automatically retries a few seconds later. So occasional CTCSS-protected voice transmissions on 144.39 wouldn't really be a problem, although an extended rag-chew would be. Bob NO6B
Re: [Repeater-Builder] tripp lite pr-25
Tripp lite does not allow there schematics out in the public, making repair of their power supplys fairly difficult. When I called asking for one they told me that they would be glad to sell me another PR-40 but couldn't offer a schematic for the one I had sitting in front of my blowd up. Repair involved the shotgun method of replacing every semiconductor component on the board. For future reference I would advise anyone to pony up the extra money and buy an Astron, at least those are user servicable. On 12/14/06, Ian Miller [EMAIL PROTECTED] wrote: Hi all Looking for a schematic for a PR-25 tripp lite power supply. Can anyone help? Contact me off list at va2ir at securenet dot net Thanks 73 Ian Yahoo! Groups Links
Re: [Repeater-Builder] Newbie Information Time - Mystery Signal
In addition to Neil's comment - you would screw up the APRS operation if you do not listen and prevent your own APRS broadcast from going out during another APRS transmission. You could key up on top of the ongoing transmission and both your own and the other packets would be QRMed. 73 - Jim W5ZIT -Original Message- From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Thu, 14 Dec 2006 10:34 AM Subject: [Repeater-Builder] Newbie Information Time - Mystery Signal In my opinion, is a slight flaw in the voice operation on 144.39 MHz below ... the FCC requires you to monitor the frequency in a non-CTCSS mode prior to transmitting. And, if you have your 144.39 MHz receiver locked up on CTCSS decode, your receiver won't hear the packet operations ... Thank you for your time, Neil McKie - WA6KLA - Original Message - From: Max Slover [EMAIL PROTECTED] Date: Wednesday, December 13, 2006 4:58 pm Subject: Re: [Repeater-Builder] Mystery Signal In case I confused anybody, this is what I am refering to with APRS and a 100hz tone --- VOICE ALERT: This simply means that you do not turn the audio down on 144.39, but instead leave it at high volume and then simply set CTCSS tone 100 to mute the speaker. This way, you dont hear any packets, but ANYONE can call you with VOICE on 144.39 to alert you by using PL 100. You will rarely use this, and only use it to tell someone to QSY to another voice channel, but it is one way of assuring that ANYONE running APRS in simplex range of you can ALWAYS be contacted with a voice call... You wont hear any packets except maybe one or two when another VOICE- ALERT mobile is in range (about 3 miles or so). But even then, he is only beaconing once every 2 minutes and so it is not bothersome at all.. In fact, it is nice to hear when someone is nearby! Its like a free radar for other mobile APRS operators that are in simplex range AND listening. --- --- Max Slover [EMAIL PROTECTED] wrote: Doh, this just hit me. It would most definitely be an APRS setup due to the 100hz subtone. In APRS you set the subtone to 100 so you can do voice alert. Man, why didn't I think of that part when this was first mentioned. Sorry for being a bit late on that but I figured I'd toss my 2 cents on this. Max... Public Information Officer -- St. Louis Suburban Radio Club K0AZV - Amateur WPWH-650 GMRS St. Louis County ARES St. Ann MO EM48tr Yahoo! Groups Links Check Out the new free AIM(R) Mail -- 2 GB of storage and industry-leading spam and email virus protection.
Re: [Repeater-Builder] tripp lite pr-25
In another life, 20 years ago or so, my employer was using Tripp-Lite yellow domed strobe lights for their construction vehicles. One day, I was visiting the central garage and noticed they had 5 Tripp-Lite strobes on a bench. I asked the foreman why, his reply was because they had crapped out and hadn't been tossed out yet. I asked him if I could take them back to my shop and he replied 'Yes!' Fast forward a bit ... I analyzed the problem of each strobe light, determined there was an early version and a later version. Quickly, I discovered the problem of each strobe light, used the unrepairable units parts to fix the repairable ones and returned the repaired units to the central shop a couple of hours later. From then on, I got all the strobe lights for repair. I didn't need to contact the manufacturer as the transistors used were fairly obvious from a bit of study (Motorola) and the rest of the parts were available from the dead strobe units or the distributor. (flash tubes) You might want to study the internal workings of your power supply in case the problem is obvious. Good luck with your project, Neil - WA6KLA - Original Message - From: DCFluX [EMAIL PROTECTED] Date: Thursday, December 14, 2006 5:45 pm Subject: Re: [Repeater-Builder] tripp lite pr-25 Tripp lite does not allow there schematics out in the public, making repair of their power supplys fairly difficult. When I called asking for one they told me that they would be glad to sell me another PR-40 but couldn't offer a schematic for the one I had sitting in front of my blowd up. Repair involved the shotgun method of replacing every semiconductor component on the board. For future reference I would advise anyone to pony up the extra money and buy an Astron, at least those are user servicable. On 12/14/06, Ian Miller [EMAIL PROTECTED] wrote: Hi all Looking for a schematic for a PR-25 tripp lite power supply. Can anyone help? Contact me off list at va2ir at securenet dot net Thanks 73 Ian
[Repeater-Builder] Re: HN462732g E prom
Thanks for reply Skip, 25V did seem to work best. I ran the chips programmed @21V, and they worked as well as those programmed @ 25V, just slower programming got my attention as I did not have specs for chip. 32k shouldn't take long to download Maybe the software has a little logic to it, to make up for errors on programming voltage.
[Repeater-Builder] Re: HN462732g E prom
No problama' if you want the data sheet search google under the full part number less the trailing g and you'll find the page with a pdf copy of the original data sheet after you file past all the over kill sharky chipdocs and datasheets web sites that try to charge money for what is otherwise free on the web. I'm sure they pay google to be first in every possible search result. cheers, skipp Greg [EMAIL PROTECTED] wrote: Thanks for reply Skip, 25V did seem to work best. I ran the chips programmed @21V, and they worked as well as those programmed @ 25V, just slower programming got my attention as I did not have specs for chip. 32k shouldn't take long to download Maybe the software has a little logic to it, to make up for errors on programming voltage.
[Repeater-Builder] Re: Micor 800MHz Base Stations?
Kris Kirby [EMAIL PROTECTED] wrote: Did Motorola ever make a Micor or earlier vintage base station with a tube PA on 800MHz? Yes, the pa assembly was actually made for Motorhead by Eimac and it uses a triode like the 3cx400u-a7 type tube (trying to remember the actual tube number). We had a lot of problems with the early operation units because people didn't know how to tune them, the blowers failed and the heater voltage was always set wrong (way to high). Sometimes it took Motorola a serious length of time for the engineering folks to source a known circuit/equipment problem. But when high dollar tubes were going bad in units less than a year old you can bet they woke up and sourced the problems pretty fast. I have a factory internal memo about the results of the premi tube failure problem and the fix, which was included in manual updates and/or updated manuals. The PA Assemblies are often seen on ebay without the monster matching power supply. There are also 900MHz units but much harder to find and yes... with lot of work the 800 unit will go up to 900 MHz. cheers, skipp
[Repeater-Builder] Re: Micor 800MHz Base Stations?
If you worry about the type pa causing duplexer heating... then you have the wrong type of duplexer. It's not really going to be a problem... unless something in the equipment is marginal, which is not normally the case. ... especially the type of duplexer as a general rule. s. Kris Kirby [EMAIL PROTECTED] wrote: On Thu, 14 Dec 2006, Mike Perryman wrote: I have no idea about a tube version... but I have a Micor 75W solid state PA for 800 if you are interested lemme know.. Not really. What I'm thinking is that a tube-type PA would have less noise generated as a result of amplification which would mean less heat expended in the duplexers and harmonic filters.
[Repeater-Builder] Re: Micor 800MHz Base Stations?
Yep... right on the money Joe... And one other thing to mention. If you find one of the monster pa units out there... don't even try to waste your time with it unless you get the matching monster power supply (a real cluster %$**) and the proper service manual (in most cases). If you don't have the power supply... you'll need to spend a bit of time with us over at the yahoo rfamplifiers group: http://groups.yahoo.com/group/rfamplifiers/ unless you're very motivated. cheers, skipp Joe Montierth [EMAIL PROTECTED] wrote: Even if a solid state TX at 100 watts only had the spurious and harmonics down 20dB, that would only be 1 watt of additional heat generated. Most transmitters have such things reduced by at least 60dB, which would make the additional heat generated at something less than a milliwatt, hardly worth mentioning. The heat comes from the loss of the device. A 1 dB loss will introduce about 20 watts of heat from a 100 watt TX. Joe
