[Repeater-Builder] Re: Need: VHF Exec II Exciters
Thanks to all that replied. I'm all set now. This is a great group! Dwayne Kincaid WD8OYG Hi, I need a few VHF Exec II exciters (same as VHF MVP exciters) and can trade with Exec II UHF exciters, UHF receivers, VHF receivers or just plain purchase. Thanks, Dwayne Kincaid WD8OYG
Re: [Repeater-Builder] Statistics
Mike Morris WA6ILQ wrote: Recently I did some research on the membership statistics for this group. Here's some interesting info: snip 1,679 are on No Email - i.e. they read the mail via the YahooGroups web site and they have locked themselves out of special notices. That last tidbit is very surprising to me. I would have thought that maybe 1/10 that many would go to the hassle of reading the mail through a web browser. I've always wondered about that myself. Reading a yahoo (or even a true 'usenet' group) via a web site is soo slww, and you have no way of knowing which msgs you've read until you actually open the msg (or can remember by looking at the subject and author...) 1694 are in Fully Featured mode, the rest are either in Default or Traditional mode. The Default mode ones haven't made a choice yet. Yahoo may make one for them at some point. Not sure what you mean by that...??? -- Jim Barbour WD8CHL
[Repeater-Builder] Re: Johnson PPL 6060 manual needed
Well, Speaking of EFJ PPLs, has anyone accually performed the repeater mods that are descibed on the repeater builder page? I have done one radio, but I am getting RF into the receiver. Jim Sharp (the author) mentions putting a shield around Q1, but the transistors are not labeled that way. I don't really see any EASY way to install any shield that would do much good due to the trace layout on the board. By-the-way, I tried to contact Jim Sharp and had no luck. Anyway, I am trying to use one of these radios for a remote receiver on 448.325RX and 433.050TX (radio tuned up fine). When the radio keys up, I get a squealing noise. Even when there is just squelch noise and no RX signal. It sounds like RF to me. If anyone has hints of ideas, let me know. Also I want to thanks Eric for the manual posting! -Jordan --- In Repeater-Builder@yahoogroups.com, Paul Finch [EMAIL PROTECTED] wrote: George, The PPL series radios are very good as well as being easy to work on. You can almost trace the signal path without a schematic even without experience, I do but I worked on them when they first came out in the late 70's early 80's. You can do a lot with these little radios. Paul -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Eric Lemmon Sent: Saturday, February 17, 2007 5:10 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Johnson PPL 6060 manual needed George, By an amazing coincidence, I am just now scanning a Johnson PPL-6060 Service Manual into PDF for posting on the RBTIP. I can send you the same file this evening. Some PPL-6060 info is already available here: www.repeater-builder.com/johnson/index.html 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of George Henry Sent: Saturday, February 17, 2007 2:08 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Johnson PPL 6060 manual needed Just picked up a bunch of these on eBay, 2 of which supposedly need repair Anybody got a manual I can copy return, or buy outright? George, KA3HSW / WQGJ413 Yahoo! Groups Links -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.441 / Virus Database: 268.18.1/690 - Release Date: 2/16/2007 2:25 PM -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.441 / Virus Database: 268.18.1/690 - Release Date: 2/16/2007 2:25 PM p class=style1Visit a href=http://www.ourphonelist.com;OurPhonelist.combrIt's free and you'll never lose track of a phone number again! /a/p
[Repeater-Builder] Tait 800 Slimline 20kHz Mod ?
Hello all, Has anyone here, or does anyone here know of anyone who has successfully modified a Tait 800 Slimline to work on 20kHz steps? I have two of them and would like to use them on the 440 Amateur UHF band. Any help would be greatly appreciated ! Paul Metzger K6EH
Re: [Repeater-Builder] Johnson PPL 6060 manual needed
Yep... discovered the PowerPole connectors right off the bat. Did some quick bench tests on them yesterday and identified one with a flaky power connector (cold solder joint), one with a channel select button that wouldn't latch on Ch. 1 (not a problem for repeater or link apps), one with no RX and one with intermittent TX. As soon as I get the rest cleaned up, I'll make some available on here for anyone who is interested. They supposedly make great link radios, are easy to duplex, and make nice low-power repeaters. George, KA3HSW / WQGJ413 - Original Message - From: Johnny [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Saturday, February 17, 2007 6:03 PM Subject: Re: [Repeater-Builder] Johnson PPL 6060 manual needed Those are a good solid little radio. If you need power cords, the connector is a standard Anderson Power Pole connector. Johnny George Henry wrote: Just picked up a bunch of these on eBay, 2 of which supposedly need repair Anybody got a manual I can copy return, or buy outright? George, KA3HSW / WQGJ413
[Repeater-Builder] Moto Moxy help!
Arrg!!! I just sold an old high-band Moxy on eBay, and now can't seem to locate the service manual I promised to send with it Anybody got a scanned version? Mostly in need of the tuneup procedure (55-watt PA) Thanks! George, KA3HSW / WQGJ413
Re: [Repeater-Builder] Re: Antennas that work both in commercial and amateur
ocwarren2000 wrote: I've been watching this topic and cannot recommend the half wave dipole bay antennas as not really efficient gain wise for what one gets for the effort.. The Station Master series has been mentioned, which has good omnidirectional gain, in the order of some 10 db, and which is equal to having a 10 element beam in all directions!! Far above a 4 section dipole arrangment! As Laryn mentioned, the 10dB stationmasters are only available at UHF and above, because a 10dB version at 150Mhz (probably even 220) would be on the order of 40-50' long! In the same vertical space as a UHF 10dBd stationmaster, you can also put in an 8-bay folded dipole array (most commercial x-bay arrays use folded dipoles), which yields 9dBd. The advantage most find with the dipole arrays is that they are DC grounded, and are less susceptible to noise, rain static, etc. -- Jim Barbour WD8CHL
Re: [Repeater-Builder] Re: 1953 Motorola BaseRadio for 6meters
All these modules inside the cab are labeled thus: Final RF amplifier comprised of two PL-254W tubes: P-8233B Exciter: P-8630-AM2 this threw me because I thought for a moment it was AM not FM. Not true, it is FM. Receiver: P08607-AH incidentally, one of two crystals on receiver is 16.54167 MHz. There is another one, but it only says something like 3355 very nondiscript, in a 'pinch' holder, that is to say retained on the chassis by a pinch device. Power supply/ transformer chassis with 2ea. 5R4-GY tubes (regulators?) Xmit/Receive rotary switch panel: P-8449B Squelch/ Line Input Control---does this control the audio INTO the exciter? Microphone gain that is?: P-8066-N HV Power supply: P-8238-C-2 I cannot find a receiver model number that looks anything like this. Maybe there are other places to look. I really don't know about these model numbers that I have supplied here as to what they mean. I assume P prefix has some global meaning relating to the entire unit. The complete model number is: FSTR520BR(FW)1ASP2 The chassis number underneath the model number is: 1413 The mfr. date is Oct. 1953. This is found on the rear, at the top, outside the cabinet. What is the RED book, what is the yellow book? Can you clue me in. I'm willing to go to the library of Congress if necessary. All Your help(s) is VERY appreciated, Rod. On Sun, 18 Feb 2007 23:09:46 -0500, George Sintchak [EMAIL PROTECTED] wrote: As I mentioned in my earlier posting, The last IF is probably 1.7 MHz if the receiver model is a FMRU13V(A). A rcvr without the (A) in the model number was a less selective receiver that (I believe) used a higher freq last IF. That may be what you have with the 2.9 MHz last IF for low band receiver. NONE of these receivers had any type of Permakay filter or a 455 kHz last IF! What is the complete model number stamped on the blue front panel of the receiver under the Motorola name? You really need one of those Yellow schematic books I mentioned before. You are really testing my memory on all of this George --- In Repeater-Builder@yahoogroups.com, Rod Shaner [EMAIL PROTECTED] wrote: What is the IF for this 1953 Motorola 520BR rig? 2.9MHz?? R. On Sat, 17 Feb 2007 20:09:50 -0500, Eric Lemmon [EMAIL PROTECTED] wrote: www.com-spec.com/narrow.htm -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/ -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/ Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) * To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Re: Antennas that work both in commercial and amateur
Laryn Lohman wrote: --- In Repeater-Builder@yahoogroups.com, Barry C' [EMAIL PROTECTED] wrote: I presume its some sort of stacked arrangment , in chich case it will make that gain at resonance , Yes, the ASPB602 is four stacked dipoles, just like the DB224. My point again is that resonance is NOT a requirement for an effective and efficient antenna. Right-slightly OT, for a mobile antenna, you will find that you can squeak out a bit more gain by using a .64-wavelength whip instead of a pure 5/8-wave (.625) In the late 60's/early 70's, the NewTronics BBL series VHF gain antennas were rated at an honest 4dB gain-and did it. The A/S VHF gain antennas measured about 2 dB. They were actually end-fed 1/2-waves... If you can find an original BBL-144 still in good shape after 30+ years, keep it! -- Jim Barbour WD8CHL
Re: [Repeater-Builder] Re: 1953 Motorola BaseRadio for 6meters
That's really weird, because it's all enclosed in a metal box, and the only visible connector is a RCA connector on each end! There doesn't SEEM to be any plethora of tube supply wires, etc..I'll have to look again. R. On Sun, 18 Feb 2007 22:53:30 -0500, George Sintchak [EMAIL PROTECTED] wrote: The K-8436-A Permakay filter (first generation)was the large sized 455 kHz unit that was used in the Sensicon A series receivers. It had all miniature tubes. That filter was superceeded with the TU455 series (smaller size - 2nd generation) 455 kHz filters used in the Unichannel G (and other) series receivers. George --- In Repeater-Builder@yahoogroups.com, Rod Shaner [EMAIL PROTECTED] wrote: How about this: Filter number on I.F. is K-8436-A. Possibly K-6436-A (hard to resolve whether it's an eight or a six.) Another idea: How about using enough preamps that the selectivity is increased and sensitivity (spread) is decreased? As I understand it, the receiver is too broadbanded at present by a factor of 3. R. On Sat, 17 Feb 2007 17:50:09 -0500, Dick [EMAIL PROTECTED] wrote: If memory serves, that radio is old enough to be a wideband rig (+/- 15 KHz FM deviation). You can turn down the XMTR FM dev to +/- 5 KHz, but your receiver's bandwidth is more complex to narrow it down to +/- 5 KHz. As it is now, you're nowhere near filling up its RCV bandwidth, so the remaining RCVR bandwidth lets noise through. There used to be some parts around that you could replace in the RCVR to narrowband (+/- 5 KHz), but I suspect they'd be nearly impossible to find now. You might be better off digging up a more modern RCVR and using it. 73, Dick - Original Message - From: rod_shaner [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: 17 February, 2007 11:29 Subject: [Repeater-Builder] 1953 Motorola BaseRadio for 6meters Hi all, I'm seeking schematics, manuals, and advice on peaking a working unit. Its model number is FSTR520BR(FW)1ASP2. Just tearing that model number apart is a workload! It was a commercial base radio, and it's crystalled for 52.525 FM. Right now I'm trying to get as much as possible out of the receiver. It works, but 25 mile away 40W signal radiated through a vertical antenna is just out of the noise on this end. My receive antenna's base is 30 inches off the ground for test purposes. Advice is requested. Thanks. -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/ -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/ Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) * To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Tait 800 Slimline 20kHz Mod ?
I think you are referring to the repeater which will be 1 channel normally... Program it to the nearest 12k5 step and warp the tcxo on freq It should be able to net on freq... Only reason you need to match steps would be in a multifreq or mobile as the step size would be required to maintain channel spacing.. Doug KD8B At 10:33 AM 2/19/2007, you wrote: Hello all, Has anyone here, or does anyone here know of anyone who has successfully modified a Tait 800 Slimline to work on 20kHz steps? I have two of them and would like to use them on the 440 Amateur UHF band. Any help would be greatly appreciated ! Paul Metzger K6EH
Re: [Repeater-Builder] Re: 1953 Motorola BaseRadio for 6meters
Permakay filters did not have tubes in them, just an in out. -- Original Message -- Received: Mon, 19 Feb 2007 11:37:15 AM CST From: Rod Shaner [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: 1953 Motorola BaseRadio for 6meters That's really weird, because it's all enclosed in a metal box, and the only visible connector is a RCA connector on each end! There doesn't SEEM to be any plethora of tube supply wires, etc..I'll have to look again. R. On Sun, 18 Feb 2007 22:53:30 -0500, George Sintchak [EMAIL PROTECTED] wrote: The K-8436-A Permakay filter (first generation)was the large sized 455 kHz unit that was used in the Sensicon A series receivers. It had all miniature tubes. That filter was superceeded with the TU455 series (smaller size - 2nd generation) 455 kHz filters used in the Unichannel G (and other) series receivers. George --- In Repeater-Builder@yahoogroups.com, Rod Shaner [EMAIL PROTECTED] wrote: How about this: Filter number on I.F. is K-8436-A. Possibly K-6436-A (hard to resolve whether it's an eight or a six.) Another idea: How about using enough preamps that the selectivity is increased and sensitivity (spread) is decreased? As I understand it, the receiver is too broadbanded at present by a factor of 3. R. On Sat, 17 Feb 2007 17:50:09 -0500, Dick [EMAIL PROTECTED] wrote: If memory serves, that radio is old enough to be a wideband rig (+/- 15 KHz FM deviation). You can turn down the XMTR FM dev to +/- 5 KHz, but your receiver's bandwidth is more complex to narrow it down to +/- 5 KHz. As it is now, you're nowhere near filling up its RCV bandwidth, so the remaining RCVR bandwidth lets noise through. There used to be some parts around that you could replace in the RCVR to narrowband (+/- 5 KHz), but I suspect they'd be nearly impossible to find now. You might be better off digging up a more modern RCVR and using it. 73, Dick - Original Message - From: rod_shaner [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: 17 February, 2007 11:29 Subject: [Repeater-Builder] 1953 Motorola BaseRadio for 6meters Hi all, I'm seeking schematics, manuals, and advice on peaking a working unit. Its model number is FSTR520BR(FW)1ASP2. Just tearing that model number apart is a workload! It was a commercial base radio, and it's crystalled for 52.525 FM. Right now I'm trying to get as much as possible out of the receiver. It works, but 25 mile away 40W signal radiated through a vertical antenna is just out of the noise on this end. My receive antenna's base is 30 inches off the ground for test purposes. Advice is requested. Thanks. -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/ -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/ Yahoo! Groups Links
[Repeater-Builder] Re: Johnson PPL 6060 manual needed
--- In Repeater-Builder@yahoogroups.com, twoway_tech [EMAIL PROTECTED] wrote: Well, Speaking of EFJ PPLs, has anyone accually performed the repeater mods that are descibed on the repeater builder page? I have done one radio, but I am getting RF into the receiver. Jim Sharp (the author) mentions putting a shield around Q1, but the transistors are not labeled that way. I don't really see any EASY way to install any shield that would do much good due to the trace layout on the board. [snip] Haven't done one yet, but have been studying the docs and, according to the block diagram and schematic, the first RF amp is actually Q201. There is a picture of where to solder the shield in the updated-ppl- board.doc file, linked from the conversion page. It goes on the foil side of the board, almost dead-center side-to-side, about 1/4 of the way forward from the rear edge. George, KA3HSW / WQGJ413
[Repeater-Builder] pc-board design program wanted
can any one recommend a good pc-board design program easy to use and free or cheap to buy ? thanks Keith VA3KMC
Re: [Repeater-Builder] Tait 800 Slimline 20kHz Mod ?
Paul Metzger wrote: Hello all, Has anyone here, or does anyone here know of anyone who has successfully modified a Tait 800 Slimline to work on 20kHz steps? I have two of them and would like to use them on the 440 Amateur UHF band. Any help would be greatly appreciated ! Paul Metzger K6EH Paul, As stated in an earlier reply, the T800 Series I radios work fine on 20 KHz channels. The only downside is you can not use the factory software to generate the PROM code as it is limited to 12.5KHz channel steps. By changing the reference divide ratio (R) you can use 10KHz channel steps instead of 12.5KHz steps. I am currently using them on 20KHz channels at three sites. If you are uncomfortable with the formulas, let me know the channels you wish to use and I can supply a hex format file with the channel info you need. You would then load the hex file into your EPROM programmer and go from there. The formulas for generating the hex values required are (hopefully this will be readable once posted): TX FREQ(MHz) = M * 0.64 + A * 0.01 RX FREQ(MHz) = M * 0.64 + A * 0.01 + 45 WORD1 2 3 4 5 6 7 8 REG M M M A A R R R BIT L 0 2 6 0 4 0 4 8 BIT M 1 5 9 3 6 3 7 10 | | | | | | | | M A CH #| | | | | | | | 0 08 0E 0A 0E 00 0A 00 00698 14 446.860 TX USING 10 KHZ STEPS 1 08 0E 0A 00 01 0A 00 00698 16 446.880 TX USING 10 KHZ STEPS 0 00 0B 09 06 00 00 04 01620 06 441.860 RX USING 10 KHZ STEPS 1 0C 0A 09 08 00 00 04 01620 08 441.880 RX USING 10 KHZ STEPS The synthesizer data for M, A, and R is stored in the right / lower 4 bit nibbles of each byte above. 446.860 TX using 10 KHz steps (R = 10 decimal = 0A hex) R register = 10 decimal = 0A hex (sets 10 KHz TX channel spacing) M register = 698 decimal = 2BA hex lsb msb 0101110101 = 8H + B0H + 200H 1248124812 A register = 14 decimal = 0E hex lsb msb 0111000 = EH + 0H 1248124 To calculate the desired code for 446.86 TX: 446.86 / 0.64 = 698.21875 (the integer portion 698 is the M code) 698 * 0.64 = 446.72 446.86 - 446.72 = 0.14 140 KHz / 10KHz = 14 (the A code is 14) Hopefully that makes sense. Ed Yoho WA6RQD
Re: [Repeater-Builder] pc-board design program wanted
Kieht; For non production, amateur, and student use, Express PCB and PCB Express offer free cad programs to do boards they support internally. Launch ordering right inside,...simple layout tools.. Tough to beat for easy learning curve and one-off assy's.. A few days turn to get them done pretty reasonable pricing for prototypes not destined for production. If you plan on making lots of a board through conventional board houses, then more conventional cad programs would be in order but largely have longer learning curvessome of those have pin limited free versions and demos... Eagle http://www.cadsoft.de/freeware.htm is a popular one... I use Express PCB for my personal choice between the two former sources... Doug KD8B At 02:19 PM 2/19/2007, you wrote: can any one recommend a good pc-board design program easy to use and free or cheap to buy ? thanks Keith VA3KMC
[Repeater-Builder] Re: 1953 Motorola BaseRadio for 6meters
Gez! Sorry for your confusion. The It in the sentance referred to the preceeding noun, that being receivers, meaning that the Sensicon A series receivers all had miniature tubes. The receiver I think you have, a 13V(A), has all Loctal tubes (do yo know what they are?). As I asked earlier, What is the model number stamped on the front panel? George --- In Repeater-Builder@yahoogroups.com, Rod Shaner [EMAIL PROTECTED] wrote: That's really weird, because it's all enclosed in a metal box, and the only visible connector is a RCA connector on each end! There doesn't SEEM to be any plethora of tube supply wires, etc..I'll have to look again. R. On Sun, 18 Feb 2007 22:53:30 -0500, George Sintchak [EMAIL PROTECTED] wrote: The K-8436-A Permakay filter (first generation)was the large sized 455 kHz unit that was used in the Sensicon A series receivers. It had all miniature tubes. That filter was superceeded with the TU455 series (smaller size - 2nd generation) 455 kHz filters used in the Unichannel G (and other) series receivers. George --- In Repeater-Builder@yahoogroups.com, Rod Shaner kb8fly@ wrote: How about this: Filter number on I.F. is K-8436-A. Possibly K-6436-A (hard to resolve whether it's an eight or a six.) Another idea: How about using enough preamps that the selectivity is increased and sensitivity (spread) is decreased? As I understand it, the receiver is too broadbanded at present by a factor of 3. SNIP
Re: [Repeater-Builder] pc-board design program wanted
Thanks doug will give that a try Keith Doug Bade wrote: Kieht; For non production, amateur, and student use, Express PCB and PCB Express offer free cad programs to do boards they support internally. Launch ordering right inside,...simple layout tools.. Tough to beat for easy learning curve and one-off assy's.. A few days turn to get them done pretty reasonable pricing for prototypes not destined for production. If you plan on making lots of a board through conventional board houses, then more conventional cad programs would be in order but largely have longer learning curvessome of those have pin limited free versions and demos... Eagle http://www.cadsoft.de/freeware.htm is a popular one... I use Express PCB for my personal choice between the two former sources... Doug KD8B At 02:19 PM 2/19/2007, you wrote: can any one recommend a good pc-board design program easy to use and free or cheap to buy ? thanks Keith VA3KMC Yahoo! Groups Links
Re: [Repeater-Builder] pc-board design program wanted
At 11:19 AM 2/19/2007, you wrote: can any one recommend a good pc-board design program easy to use and free or cheap to buy ? ---It depends on how complex your layout will be. We use Eagle by Cadsoft but they do have a free demo version. http://www.cadsoftusa.com Ken -- President and CTO - Arcom Communications Makers of the world famous RC210 Repeater Controller and accessories. http://www.arcomcontrollers.com/ Authorized Dealers for Kenwood and Telewave and we offer complete repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net
Re: [Repeater-Builder] pc-board design program wanted
Hi I use DipTrace quite a lot. It is a relatively new program, includes schematic, pcb, components libraries with custom capabilities, autorouting. It comes as a free 30 day trial, a light version and the full version is about $500 or so, 1/10th of the big guys. Free to check it out. Made many boards with complicated networks and very small footprints and am quite satisfied. Also the customer service is outstanding. The author responds within hours usually to quesitons by the user. Since is it new (1-2 years old), there are many requests for features which are responded to whether positively or negatively. I am very happy with the product. I own the full version. Russ Keith [EMAIL PROTECTED] wrote: can any one recommend a good pc-board design program easy to use and free or cheap to buy ? thanks Keith VA3KMC
Re: [Repeater-Builder] pc-board design program wanted
Here's one that's GNU license: http://www.freepcb.com/ Never used it, just passing it along. Scott Scott Zimmerman Amateur Radio Call N3XCC 474 Barnett Road Boswell, PA 15531 - Original Message - From: Keith To: Repeater-Builder@yahoogroups.com ; [EMAIL PROTECTED] Sent: Monday, February 19, 2007 2:19 PM Subject: [Repeater-Builder] pc-board design program wanted can any one recommend a good pc-board design program easy to use and free or cheap to buy ? thanks Keith VA3KMC -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.441 / Virus Database: 268.18.2/692 - Release Date: 2/18/2007 4:35 PM
[Repeater-Builder] Micor Channel Elements
Looking for channel elements for VHF Micor repeater Need KXN 1019B Have other many other elements to trade GE, RCA. Motorola Thanks for looking Sam Ripple W9QKF KAE7607
RE: [Repeater-Builder] Re: Antennas that work both in commercial and amateur
-Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- [EMAIL PROTECTED] On Behalf Of Jim B. Sent: Monday, February 19, 2007 12:42 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Antennas that work both in commercial and amateur Laryn Lohman wrote: --- In Repeater-Builder@yahoogroups.com, Barry C' [EMAIL PROTECTED] wrote: I presume its some sort of stacked arrangment , in chich case it will make that gain at resonance , Yes, the ASPB602 is four stacked dipoles, just like the DB224. My point again is that resonance is NOT a requirement for an effective and efficient antenna. Right-slightly OT, for a mobile antenna, you will find that you can squeak out a bit more gain by using a .64-wavelength whip instead of a pure 5/8-wave (.625) In the late 60's/early 70's, the NewTronics BBL series VHF gain antennas were rated at an honest 4dB gain-and did it. The A/S VHF gain antennas measured about 2 dB. They were actually end-fed 1/2-waves... If you can find an original BBL-144 still in good shape after 30+ years, keep it! -- Jim Barbour WD8CHL Are you telling us that the difference in length between .64 wavelength and .625 wave length, a mere .015 (about 1.2 inches)amount, accounts for a full db of gain? How do you know they provided 4 db of gain? 73 Gary K4FMX
[Repeater-Builder] Repeater Time Out Award
I have a Friend who always Times out my Repeater and others , Not that this is a Bad thing, The Repeaters are being used, He has jokingly wondered why No one or I has sent Him a Time out Award. I looked on line and found nothing can anyone please let me know of one. I could Print out and Frame . It can be humorous too Thanks Don KA9QJG
Re: [Repeater-Builder] Re: Antennas that work both in commercial and amateur
Right-slightly OT, for a mobile antenna, you will find that you can squeak out a bit more gain by using a .64-wavelength whip instead of a pure 5/8-wave (.625) In the late 60's/early 70's, the NewTronics BBL series VHF gain antennas were rated at an honest 4dB gain-and did it. The A/S VHF gain antennas measured about 2 dB. They were actually end-fed 1/2-waves... If you can find an original BBL-144 still in good shape after 30+ years, keep it! -- Jim Barbour WD8CHL Are you telling us that the difference in length between .64 wavelength and .625 wave length, a mere .015 (about 1.2 inches)amount, accounts for a full db of gain? End result: 4dB gain over a 1/4-wave (should've specified that part). Not sure whether it was a full dB over a 5/8-but that was the peak in the gain curve. How do you know they provided 4 db of gain? 73 Gary K4FMX Measured on their range-they used to be based in Cleveland, and my father was one of the designers. (anybody here remember the PRO-27JR 27Mhz antenna? Or the original 4BTV?) -- Jim Barbour WD8CHL
Re: [Repeater-Builder] Repeater Time Out Award
Don wrote: I have a Friend who always Times out my Repeater and others , Not that this is a Bad thing, The Repeaters are being used, He has jokingly wondered why No one or I has sent Him a Time out Award. I looked on line and found nothing can anyone please let me know of one. I could Print out and Frame . It can be humorous too Look for 'Purple Xtal'... -- Jim Barbour WD8CHL
Re: [Repeater-Builder] Repeater Time Out Award
Don wrote: I have a Friend who always Times out my Repeater and others , Not that this is a Bad thing, The Repeaters are being used, He has jokingly wondered why No one or I has sent Him a Time out Award. I looked on line and found nothing can anyone please let me know of one. I could Print out and Frame . It can be humorous too Thanks Don KA9QJG Here in Dallas on the 146.88 machine they used to have a Bozo Alert Maybe we can get that word put in the rc-810 :) Anyway, You could always build him a golden microphone award.. Just take an old CB mic and build a wooden base with a piece of wooden dowel sticking up. Attach the mic to the top and coil the cord all the way down and add cheap gold paint and WHALA! -- Jay Urish W5GM ARRL Life MemberDenton County ARRL VEC N5ERS VP/Trustee Monitoring 444.850 PL-88.5
Re: [Repeater-Builder] Repeater Time Out Award
At 01:31 PM 2/19/2007, you wrote: Maybe we can get that word put in the rc-810 :)] Actually, it is :-) Ken -- President and CTO - Arcom Communications Makers of the world famous RC210 Repeater Controller and accessories. http://www.arcomcontrollers.com/ Authorized Dealers for Kenwood and Telewave and we offer complete repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net
[Repeater-Builder] NEED HELP FINDING DATA ON GE PE SERIES REMOTE UHF RECEIVER???
I have purchased a GE PE series portable receiver neatly mounted in a an RF sealed case and now crystaled in the 458 MHz range. I am looking for info (the LBI would be nice) for this radio so I can learn the crystal formula and tuning instructions. Any help would be appreciated. Augiust W8MIA
Re: [Repeater-Builder] 1953 Motorola BaseRadio for 6meters
The radio you have is probably an FSTR250, not 520... the IF is 455 kHz, not 10.7 so the filter crystals made by Comm. Spec will not work. I assume that you have the Sensicon A receiver, about 5 inches wide with a rather big IF filter, about 4x4x2. If the last letter on the filter is an S it is 5KHz width. if not, it's 15 KHZ.Changing the resistor between the plates of the 6AL5 Discriminator tube to a higher value.. 180K??? if memory serves correct,,will give you more audio recovery. Although the TU540S filter offered is incorrect for the receiver, it can be made to work in the older Sensicon by adjusting the gain of the IF amp. Lance N2HBA - Original Message - From: Eric Lemmon To: Repeater-Builder@yahoogroups.com Sent: Saturday, February 17, 2007 8:09 PM Subject: RE: [Repeater-Builder] 1953 Motorola BaseRadio for 6meters Dick, I think you're right about the bandwidth. Communications Specialists, one of the first companies to enter the narrow-banding market, is still in the same business. Com-Spec just might have the filter kit needed. Go here: www.com-spec.com/narrow.htm 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Dick Sent: Saturday, February 17, 2007 2:50 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] 1953 Motorola BaseRadio for 6meters If memory serves, that radio is old enough to be a wideband rig (+/- 15 kHz FM deviation). You can turn down the XMTR FM dev to +/- 5 kHz, but your receiver's bandwidth is more complex to narrow it down to +/- 5 KHz. As it is now, you're nowhere near filling up its RCV bandwidth, so the remaining RCVR bandwidth lets noise through. There used to be some parts around that you could replace in the RCVR to narrowband (+/- 5 KHz), but I suspect they'd be nearly impossible to find now. You might be better off digging up a more modern RCVR and using it. 73, Dick - Original Message - From: rod_shaner [EMAIL PROTECTED] mailto:kb8fly%40copper.net To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: 17 February, 2007 11:29 Subject: [Repeater-Builder] 1953 Motorola BaseRadio for 6meters Hi all, I'm seeking schematics, manuals, and advice on peaking a working unit. Its model number is FSTR520BR(FW)1ASP2. Just tearing that model number apart is a workload! It was a commercial base radio, and it's crystalled for 52.525 FM. Right now I'm trying to get as much as possible out of the receiver. It works, but 25 mile away 40W signal radiated through a vertical antenna is just out of the noise on this end. My receive antenna's base is 30 inches off the ground for test purposes. Advice is requested. Thanks
Re: [Repeater-Builder] MSR2000 PL board questions
Eric I scanned the Jumper Table and schematic of the MSR2000 PL Board. You can find it here: http://www.w0dp.com/msr2000_pl.pdf I believe Skipp answered all your other questions. Good luck. 73, John Maurer WØDP Ames, Iowa - Original Message - From: kk2ed To: Repeater-Builder@yahoogroups.com Sent: Friday, February 16, 2007 12:42 PM Subject: [Repeater-Builder] MSR2000 PL board questions Just picked up a used PL board for an MSR2000 and have a few questions: 1. I need to replace the reeds for my desired PL freq. The unit came supplied with two vibrasponder reeds (same PL). I want to use the card for decode as well as tx encode out. Do I also need to continue to use two vibrasponder reeds, or do I need to use one 'sponder and one 'sender reed in the two slots (sounds more logical)? 2. Which socket is the tx and which is the rx socket? 3. Does anyone have a scanned image of the PL board schematic and/or jumper listings? Unfortunately I don't have a audiocontrol manual around. Anyone have any experience with effect on receiver audio quality with the PL filter inline versus out of line? Reason I ask is that I originally set up the repeater with a TS64 board (which failed), and left JU1 on the audio card in place. The receiver audio has excellent freq response. I was planning on removing the JU1 once I install the OEM PL card and remove the TS64, thus inserting the PL filter in line with the rx audio feeding the controller. I'm hoping the freq response remains the same. My experience with Micor base receivers is that the PL filter changes the audio response, thus the extra cap tht is jumpered in when the filter is not present. Hence the question Thanks Eric KE2D www.w2njr.org -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.441 / Virus Database: 268.18.1/690 - Release Date: 2/16/2007 2:25 PM
RE: [Repeater-Builder] Ok, here's a weird one....
Hi Daron, I have experanced the same here in the Eugene area as well. Sometimes it would even mix with the audio and overcome the others audio. Mike -- Original message -- From: Daron J. Wilson [EMAIL PROTECTED] Ø Question: The only way I see this happening is due to some AM component on radio station's transmitter. Thoughts? Ive got one site with similar problems. MastrII repeater, in a metal cabinet, grounded, bonded quite well. Shielded audio cables, ARCOM RC-210 controller (shameless plug for Ken) and intermittent FM station audio. It comes and goes, some sort of mix with something, but the shorter shielded hook up cables helped it quite a bit. Its using a MastrII power supply and back up battery. Its tolerable most of the time, sometimes enough audio to actually hear what is being said, almost always the audio is on the tail of the repeater, not noticeable when the repeater is actually repeating. Shorter shielded cabling seemed to help the most. 73 Daron
Re: [Repeater-Builder] MSR2000 PL board questions
(2nd post) Eric I scanned the Jumper Table and schematic of the MSR2000 PL Board. You can find it here: http://www.w0dp.com/msr2000_pl.pdf I believe Skipp answered all your other questions. Good luck. 73, John Maurer WØDP - Original Message - From: kk2ed To: Repeater-Builder@yahoogroups.com Sent: Friday, February 16, 2007 12:42 PM Subject: [Repeater-Builder] MSR2000 PL board questions Just picked up a used PL board for an MSR2000 and have a few questions: 1. I need to replace the reeds for my desired PL freq. The unit came supplied with two vibrasponder reeds (same PL). I want to use the card for decode as well as tx encode out. Do I also need to continue to use two vibrasponder reeds, or do I need to use one 'sponder and one 'sender reed in the two slots (sounds more logical)? 2. Which socket is the tx and which is the rx socket? 3. Does anyone have a scanned image of the PL board schematic and/or jumper listings? Unfortunately I don't have a audiocontrol manual around. Anyone have any experience with effect on receiver audio quality with the PL filter inline versus out of line? Reason I ask is that I originally set up the repeater with a TS64 board (which failed), and left JU1 on the audio card in place. The receiver audio has excellent freq response. I was planning on removing the JU1 once I install the OEM PL card and remove the TS64, thus inserting the PL filter in line with the rx audio feeding the controller. I'm hoping the freq response remains the same. My experience with Micor base receivers is that the PL filter changes the audio response, thus the extra cap tht is jumpered in when the filter is not present. Hence the question Thanks Eric KE2D www.w2njr.org -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.441 / Virus Database: 268.18.1/690 - Release Date: 2/16/2007 2:25 PM
[Repeater-Builder] Re: pc-board design program wanted
Here is the link: http://www.expresspcb.com/ Ditto everything Doug says about it. The built-in tutorial is also nice. Dwayne Kincaid WD8OYG Kieht; For non production, amateur, and student use, Express PCB and PCB Express offer free cad programs to do boards they support internally. Launch ordering right inside,...simple layout tools.. Tough to beat for easy learning curve and one-off assy's.. A few days turn to get them done pretty reasonable pricing for prototypes not destined for production. If you plan on making lots of a board through conventional board houses, then more conventional cad programs would be in order but largely have longer learning curvessome of those have pin limited free versions and demos... Eagle http://www.cadsoft.de/freeware.htm is a popular one... I use Express PCB for my personal choice between the two former sources... Doug KD8B At 02:19 PM 2/19/2007, you wrote: can any one recommend a good pc-board design program easy to use and free or cheap to buy ? thanks Keith VA3KMC
[Repeater-Builder] Re: pc-board design program wanted
Most of the pc board houses will give you a free pc board program if you buy their services. But a generic but great program to have is Cadsoft Eagle. There is a free public version with limited size and you can pay to open it up to larger boards... the price is well worth the money. cheers, skipp Keith [EMAIL PROTECTED] wrote: can any one recommend a good pc-board design program easy to use and free or cheap to buy ? thanks Keith VA3KMC
Re: [Repeater-Builder] Repeater Time Out Award
Don: we had a member of the Chicago FM CLub years ago, an sk now unfortunately, who got the Golden Mike award for timing out the repeater. The club actually had a trophy made with an old motorola desk mike on a plaque sprayed Gold and a name plate engraved with his name and call sign. It was a hoot. Fortunately we had meetings and he was presented it at one of the meetings with 50 members or more preseent. He had no idea this was going to happen and took it well anyhow. mdm ted --- Don [EMAIL PROTECTED] wrote: I have a Friend who always Times out my Repeater and others , Not that this is a Bad thing, The Repeaters are being used, He has jokingly wondered why No one or I has sent Him a Time out Award. I looked on line and found nothing can anyone please let me know of one. I could Print out and Frame . It can be humorous too Thanks Don KA9QJG Ted Bleiman K9MDM MDM Radio If its in stock...we've got it! P O Box 31353 Chicago, IL 60631-0353 773.631.5130 fax 773.775.8096 web http://www.mdmradio.com - email - [EMAIL PROTECTED] Food fight? Enjoy some healthy debate in the Yahoo! Answers Food Drink QA. http://answers.yahoo.com/dir/?link=listsid=396545367
Re: [Repeater-Builder] NEED PL ENCODE REED
the proper address is [EMAIL PROTECTED] for reeds --- George Henry [EMAIL PROTECTED] wrote: MDM Radio's website lists 2 possible contacts for 'Sponders 'Senders: [EMAIL PROTECTED] and [EMAIL PROTECTED] ... No connection with either, or with MDM (just a satisfied past customer of Ted's...) Ted Bleiman K9MDM MDM Radio If its in stock...we've got it! P O Box 31353 Chicago, IL 60631-0353 773.631.5130 fax 773.775.8096 web http://www.mdmradio.com - email - [EMAIL PROTECTED] Expecting? Get great news right away with email Auto-Check. Try the Yahoo! Mail Beta. http://advision.webevents.yahoo.com/mailbeta/newmail_tools.html
Re: [Repeater-Builder] NEED PL ENCODE REED
the proper address is [EMAIL PROTECTED] for reeds --- George Henry [EMAIL PROTECTED] wrote: MDM Radio's website lists 2 possible contacts for 'Sponders 'Senders: [EMAIL PROTECTED] and [EMAIL PROTECTED] ... No connection with either, or with MDM (just a satisfied past customer of Ted's...) Ted Bleiman K9MDM MDM Radio If its in stock...we've got it! P O Box 31353 Chicago, IL 60631-0353 773.631.5130 fax 773.775.8096 web http://www.mdmradio.com - email - [EMAIL PROTECTED] Don't pick lemons. See all the new 2007 cars at Yahoo! Autos. http://autos.yahoo.com/new_cars.html
Re: [Repeater-Builder] Paging reed source? (was: NEED PL ENCODE REED)
waddaya mean MDM is NLA...I'm out here schlepping radio stuff. we justb closed the Mel Pk warehouse. I can't possibly retire...my wife is running loose thru the malls with credit cards... you guys need stuff please gimme a call. mdm ted --- mch [EMAIL PROTECTED] wrote: Related question... Now that MDM is NLA, where does one go to get paging reeds? Joe M. Dick wrote: Eric: If all else fails, contact Communications Specialists in Orange, CA. www.com-spec.com/ They make replacements for PL DPL modules. The Com-Spec units are synthesized and you can use the on-board DIP switch to set your tone. 73, Dick - Original Message - From: seoemsdirector [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: 17 February, 2007 06:35 Subject: [Repeater-Builder] NEED PL ENCODE REED Hello I am in need of a Vibrasponder PL encode module for a Motorola MSR2000. It needs to encode 167.9 Hz. Does anyone know a source for this product? Thanks Eric K8UHN Yahoo! Groups Links Ted Bleiman K9MDM MDM Radio If its in stock...we've got it! P O Box 31353 Chicago, IL 60631-0353 773.631.5130 fax 773.775.8096 web http://www.mdmradio.com - email - [EMAIL PROTECTED] We won't tell. Get more on shows you hate to love (and love to hate): Yahoo! TV's Guilty Pleasures list. http://tv.yahoo.com/collections/265
Re: [Repeater-Builder] Repeater Time Out Award
I once saw a old Motorola metal mobile mic that had been chrome plated, mounted to a walnut plaque, with the curly cord mounted as well... with a 1/2 piece cut out of the middle of the cord, and a pair of diagonal cutters mounted next to the cut... all with a brass tag mounted under the mic saying (insert year) Blabbermouth Award. You could do something similar and call it the Repeater Monopolizer award. At 01:23 PM 02/19/07, you wrote: I have a Friend who always Times out my Repeater and others , Not that this is a Bad thing, The Repeaters are being used, He has jokingly wondered why No one or I has sent Him a Time out Award. I looked on line and found nothing can anyone please let me know of one. I could Print out and Frame . It can be humorous too Thanks Don KA9QJG
Re: [Repeater-Builder] Statistics
At 08:48 AM 02/19/07, Jim Barbour WD8CHL wrote: Mike Morris WA6ILQ wrote: Recently I did some research on the membership statistics for this group. Here's some interesting info: snip 275 are in Special Notices mode - i.e. they read the mail via the YahooGroups web site, and if the owner or moderators send out a special notice they will get it in their normal email (note that this feature is almost never used here, in fact I can't remember the last time it was used). 1,679 are on No Email - i.e. they read the mail via the YahooGroups web site and they have locked themselves out of special notices. That last tidbit is very surprising to me. I would have thought that maybe 1/10 that many would go to the hassle of reading the mail through a web browser. I've always wondered about that myself. Reading a yahoo (or even a true 'usenet' group) via a web site is soo slww, and you have no way of knowing which msgs you've read until you actually open the msg (or can remember by looking at the subject and author...) Yep. And 1,954 folks that do that. Personally I have the Group send mine to a Yahoo mail account that I drain with a proxy program that runs on my machine in the background - my POP mail reader thinks the proxy program is a POP server, but the proxy program actually goes out and diddles the Yahoo web mail server as if I was reading (and deleting) each message... proxies are cheaper than paying Yahoo for POP access. 1694 are in Fully Featured mode, the rest are either in Default or Traditional mode. The Default mode ones haven't made a choice yet. Yahoo may make one for them at some point. Not sure what you mean by that...??? The web side (i.e. user interface) of Yahoogroups can be in one of two modes, new and old. YahooGgroups would prefer that you use the new Fully Featured mode (hence the Default name) but still support the old (Traditional) mode. Looking at the data again, 1694 have chosen the new mode, 626 have actively chosen the old mode, and 1081 have not made a choice. The 1081 may get a rude surprise some day when Yahoo makes a choice for them. BTW the group was created on Feb 13 1999 and by 1-2000 the group had 163 members. By 1-2001 it had 350 members. By 1-2002 it had 653 members. By 1-2003 it had 989 members. By 1-2004 it had 1450 members. By 1-2005 it had 1896 members. By 1-2006 it had 2519 members. By the first of this year it had 3288 members. And as of today we have 3402 members Mike WA6ILQ
Re: [Repeater-Builder] Repeater Time Out Award
Many years ago a regular user of our wide area UHF system unwittingly timed out the system. He was driving one of several vehicles (a Suburban, not his) in our annual group trip to Hamvention. Being somewhat unfamiliar with the vehicle's accessories, he shoved the mic into a cup holder on the console, top first. In doing so, he keyed the mic in a continuous state. Some ten minutes later, the rig in the truck timed out, emitting T O in morse, which got his attention. Since several of us were in route and on the system, we heard more conversation between him and his passenger than we cared to... Anyway, later that summer the group had a gathering and presented him with the trophy..a one size fits all console accessory for vehicles with a hump in the floor with...cup holders built in! Some creative soul in our bunch rigged it with a huge flashing LED connected to the PTT line of a mic and a battery...with the mic glued into the cup holder. It was a hoot! I have a Friend who always Times out my Repeater and others , Not that this is a Bad thing, The Repeaters are being used, He has jokingly wondered why No one or I has sent Him a Time out Award. I looked on line and found nothing can anyone please let me know of one. I could Print out and Frame . It can be humorous too Thanks Don KA9QJG Ted Bleiman K9MDM MDM Radio If its in stock...we've got it! P O Box 31353 Chicago, IL 60631-0353 773.631.5130 fax 773.775.8096 web http://www.mdmradio.com - email - [EMAIL PROTECTED] Food fight? Enjoy some healthy debate in the Yahoo! Answers Food Drink QA. http://answers.yahoo.com/dir/?link=listsid=396545367 Yahoo! Groups Links Thanks, Robin Midgett K4IDC 615-322-5836 office - rolls to pager 615-835-7699 pager 615-301-1642 home [EMAIL PROTECTED] http://www.people.vanderbilt.edu/~robin.midgett/index.htm
Re: [Repeater-Builder] Re: Antenna gain specs
Reading the replies that mentioned gain specs, I can't help but think of our last ham club meeting. An older member persuaded the club to replace the VHF repeater antenna with a Diamond X500HNA rather than a DB-224 because the Diamond has 8.3 dB gain. - Original Message - From: Jim B. Sent: Monday, February 19, 2007 11:41 AM Subject: Re: [Repeater-Builder] Re: Antennas that work both in commercial and amateur As Laryn mentioned, the 10dB stationmasters are only available at UHF and above, because a 10dB version at 150Mhz (probably even 220) would be on the order of 40-50' long!
Re: [Repeater-Builder] Repeater Time Out Award
* Mike Morris WA6ILQ [EMAIL PROTECTED] [2007 Feb 19 17:54 -0600]: I once saw a old Motorola metal mobile mic that had been chrome plated, mounted to a walnut plaque, with the curly cord mounted as well... with a 1/2 piece cut out of the middle of the cord, and a pair of diagonal cutters mounted next to the cut... all with a brass tag mounted under the mic saying (insert year) Blabbermouth Award. You could do something similar and call it the Repeater Monopolizer award. Or, Golden Thumb since most people press the PTT button with their thumb. Years back I programmed an RLC-4 to send GT HI when the transmitter came back on after COS drop. Yes, I earned it myself a few times. 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: 1953 Motorola BaseRadio for 6metersCLARIFICATION
Hello Rod, To set things straight, the radio is NOT an 13V series as others have said, it is much newer. The radio you have is called a Research Line, Sensicon Receiver type radio. The nominal output was 250 watts. The radio is comprised of the following: Receiver: is a PA8633, the number you have is the part # of the RF deck, which is for 40 to 50 Mhz. the receiver uses a type B02 crystal. The high IFis 2.9 mhz, the low is 455 kHz. if the receiver has a 15 kHz bandwidth the Permakay IF filter is a K8436, if it was set for 5khz audio, the filter # is K8435. The exciter is a model PA8691B, the part number you listed is that of the basic unit. The crystal is a type B04, 16 times multiple. The P8066N is a DC line termination panel. this allowed the radio to be remote controlled over a copper phone line, by using a Motorola DC remote. the squelch control on the panel is just that. the other pot is for the adjustment of the line level, normally set at 0dbm with modulation. The 520 in the model number is the maximum plate input power, in watts. power supply-wise, the small supply with the 5R4 tubes is for the exciter, receiver, and panel lamps. The other, with the mercury vapor tubes id the HV+. Be careful, this can be a killer... I am sure, but to tell you anyway, never put the B+ on without letting the Mercury tubes get warm first, they could explode. There should be 2 interconnect switches in the rear cabinet doors to keep the unit from app;lying B+ and going into transmit with the door open. You should be able to pull the switch plunger OUT a bit and click to allow the radio to work with the door open, but be CAREFUL, lots of places with HIGH B+.These PA units were tuned with hot sticks. a rod made of clear plastic that allowed for the tuning of the plate and antenna couplers with the PA covers on. Any other questions, feel free to contact me. I have serviced many of these.. years ago. Lance Alfieri N2HBA [EMAIL PROTECTED] - Original Message - From: Rod Shaner [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Monday, February 19, 2007 8:55 AM Subject: Re: [Repeater-Builder] Re: 1953 Motorola BaseRadio for 6meters All these modules inside the cab are labeled thus: Final RF amplifier comprised of two PL-254W tubes: P-8233B Exciter: P-8630-AM2 this threw me because I thought for a moment it was AM not FM. Not true, it is FM. Receiver: P08607-AH incidentally, one of two crystals on receiver is 16.54167 MHz. There is another one, but it only says something like 3355 very nondiscript, in a 'pinch' holder, that is to say retained on the chassis by a pinch device. Power supply/ transformer chassis with 2ea. 5R4-GY tubes (regulators?) Xmit/Receive rotary switch panel: P-8449B Squelch/ Line Input Control---does this control the audio INTO the exciter? Microphone gain that is?: P-8066-N HV Power supply: P-8238-C-2 I cannot find a receiver model number that looks anything like this. Maybe there are other places to look. I really don't know about these model numbers that I have supplied here as to what they mean. I assume P prefix has some global meaning relating to the entire unit. The complete model number is: FSTR520BR(FW)1ASP2 The chassis number underneath the model number is: 1413 The mfr. date is Oct. 1953. This is found on the rear, at the top, outside the cabinet. What is the RED book, what is the yellow book? Can you clue me in. I'm willing to go to the library of Congress if necessary. All Your help(s) is VERY appreciated, Rod. On Sun, 18 Feb 2007 23:09:46 -0500, George Sintchak [EMAIL PROTECTED] wrote: As I mentioned in my earlier posting, The last IF is probably 1.7 MHz if the receiver model is a FMRU13V(A). A rcvr without the (A) in the model number was a less selective receiver that (I believe) used a higher freq last IF. That may be what you have with the 2.9 MHz last IF for low band receiver. NONE of these receivers had any type of Permakay filter or a 455 kHz last IF! What is the complete model number stamped on the blue front panel of the receiver under the Motorola name? You really need one of those Yellow schematic books I mentioned before. You are really testing my memory on all of this George --- In Repeater-Builder@yahoogroups.com, Rod Shaner [EMAIL PROTECTED] wrote: What is the IF for this 1953 Motorola 520BR rig? 2.9MHz?? R. On Sat, 17 Feb 2007 20:09:50 -0500, Eric Lemmon [EMAIL PROTECTED] wrote: www.com-spec.com/narrow.htm -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/ -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/ Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * Your email settings: Individual Email | Traditional * To change settings online go to:
Re: [Repeater-Builder] Repeater Time Out Award
At 04:36 PM 02/19/07, you wrote: * Mike Morris WA6ILQ [EMAIL PROTECTED] [2007 Feb 19 17:54 -0600]: I once saw a old Motorola metal mobile mic that had been chrome plated, mounted to a walnut plaque, with the curly cord mounted as well... with a 1/2 piece cut out of the middle of the cord, and a pair of diagonal cutters mounted next to the cut... all with a brass tag mounted under the mic saying (insert year) Blabbermouth Award. You could do something similar and call it the Repeater Monopolizer award. Or, Golden Thumb since most people press the PTT button with their thumb. Years back I programmed an RLC-4 to send GT HI when the transmitter came back on after COS drop. Yes, I earned it myself a few times. 73, de Nate Well, you could take one of the rubber thumbs that you can get a joke shop, spray paint it gold, mount it to a piece of stained walnut, and put a brass plate on it? Mike
Re: [Repeater-Builder] Paging reed source? (was: NEED PL ENCODE REED)
Glad I was mistaken! Joe M. Ted Bleiman K9MDM - MDM Radio wrote: waddaya mean MDM is NLA...I'm out here schlepping radio stuff. we justb closed the Mel Pk warehouse. I can't possibly retire...my wife is running loose thru the malls with credit cards... you guys need stuff please gimme a call. mdm ted --- mch [EMAIL PROTECTED] wrote: Related question... Now that MDM is NLA, where does one go to get paging reeds? Joe M. Dick wrote: Eric: If all else fails, contact Communications Specialists in Orange, CA. www.com-spec.com/ They make replacements for PL DPL modules. The Com-Spec units are synthesized and you can use the on-board DIP switch to set your tone. 73, Dick - Original Message - From: seoemsdirector [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: 17 February, 2007 06:35 Subject: [Repeater-Builder] NEED PL ENCODE REED Hello I am in need of a Vibrasponder PL encode module for a Motorola MSR2000. It needs to encode 167.9 Hz. Does anyone know a source for this product? Thanks Eric K8UHN Yahoo! Groups Links Ted Bleiman K9MDM MDM Radio If its in stock...we've got it! P O Box 31353 Chicago, IL 60631-0353 773.631.5130 fax 773.775.8096 web http://www.mdmradio.com - email - [EMAIL PROTECTED] We won't tell. Get more on shows you hate to love (and love to hate): Yahoo! TV's Guilty Pleasures list. http://tv.yahoo.com/collections/265 Yahoo! Groups Links
[Repeater-Builder] Re: Antenna gain specs
--- In Repeater-Builder@yahoogroups.com, Paul Holm [EMAIL PROTECTED] wrote: Reading the replies that mentioned gain specs, I can't help but think of our last ham club meeting. An older member persuaded the club to replace the VHF repeater antenna with a Diamond X500HNA rather than a DB-224 because the Diamond has 8.3 dB gain. Yup, Paul, you've caught on. Diamond must be good; very good. They've bent the laws of physics again. Diamond's 18 ft. long antenna has more gain than a DB Products, Sinclair, etc., which are actually slightly longer. 8.3db gain over what? I'm here to tell you, in my humble opinion, that the Diamond's actual gain over a dipole is closer to 6dbd. Laryn K8TVZ
Re: [Repeater-Builder] Re: MSR2000 ,where to adjust the duration of the tail??
hi skipp, i rememember there was something about jumpers to adjust the tail,i think you have it. i will go at the radio site this week end and check it thanks for those specs,, really appreciate gervais,ve2ckn/va2dq - Original Message - From: skipp025 To: Repeater-Builder@yahoogroups.com Sent: Sunday, February 18, 2007 12:07 AM Subject: [Repeater-Builder] Re: MSR2000 ,where to adjust the duration of the tail?? Hello Gervias, Two places control the majority of your tail time. If you're using a repeater controller with the factory modules both have settings/jumpers. If you have a bare MSR-2000 Repeater the tail time is selected with a jumper on the Squelch Gate Module. The jumper can be placed on a number of available factory time periods in seconds. There are two loose wire jumpers on the Squelch Gate Module. Only one of the two is the tail time jumper/selector and where the clip slide onto the pin end of the wire... it should be obvious by the silk screen writing on the board what time pins are available. Pick 0 (zero) time and you'll still have a very small hang time (with the stock unmodified repeater). If you have an external repeater controller installed with the factory modules... be sure to set the contoller tail time to a smaller /min value. cheers, skipp gervais [EMAIL PROTECTED] wrote: hi, i have an MSR2000 Vhf running here with a tail at the end of the transmit, i dont remember exactly where but i do remember it was somewhere on a slot card that there was a adjustement for the duration of the tail, i need to short it so it wont have a tail on Echolink here i need an indication on which one,could i have some tips please?? thanks gervais ve2ckn
RE: [Repeater-Builder] Statistics
This says a lot, not only for the list itself, but the people who populate it. There is a **wealth** of information here, which I like to consume on a regular basis. This is one of the lists that I actually get individual messages from - simply because I LIKE to read the material, and I actually LEARN from the posts. (When I feel I have a little information of worth, I contribute also...) Congratulations to Mike and all who own/administer this group. 3400 members says a LOT about your efforts!! 73 de Mark - N9WYS -Original Message- From: Repeater-Builder@yahoogroups.com On Behalf Of Mike Morris WA6ILQ (snip) BTW the group was created on Feb 13 1999 and by 1-2000 the group had 163 members. By 1-2001 it had 350 members. By 1-2002 it had 653 members. By 1-2003 it had 989 members. By 1-2004 it had 1450 members. By 1-2005 it had 1896 members. By 1-2006 it had 2519 members. By the first of this year it had 3288 members. And as of today we have 3402 members Mike WA6ILQ Yahoo! Groups Links
RE: [Repeater-Builder] Repeater Time Out Award
One of the local police departments here awarded one of their officers with the Golden Microphone Award, a Motorola Mic painted gold and affixed to a wooden plaque, after she unwittingly had her mic keyed while she sang Oh Mickey! You're so fine... in its entirety. This was presented at their annual awards banquet... Needless to say the incident - or any similar - was not repeated for quite some time. ;-) Mark - N9WYS
RE: [Repeater-Builder] Re: Antenna gain specs
I believe Diamond uses gain over **isotropic** (dBi) for their rating specs... which might account for the extra ~2.2dB. (If memory serves me the difference between dBi and dBd is about 2.2 - yes?) This is one reason to be careful about what the respective company is using for their comparison... gain vs Isotrpoic or gain vs Dipole. Mark - N9WYS -Original Message- From: Repeater-Builder@yahoogroups.com On Behalf Of Laryn Lohman Yup, Paul, you've caught on. Diamond must be good; very good. They've bent the laws of physics again. Diamond's 18 ft. long antenna has more gain than a DB Products, Sinclair, etc., which are actually slightly longer. 8.3db gain over what? I'm here to tell you, in my humble opinion, that the Diamond's actual gain over a dipole is closer to 6dbd. Laryn K8TVZ
Re: [Repeater-Builder] Statistics
BTW the group was created on Feb 13 1999 Happy belated 8th birthday! Wow, has it really been that long? Remember eGroups, and OneList? Those are the other folks that run the mail servers before Yahoo! bought them out. Thanks everyone for a popular - productive list. Kevin Custer List Owner
RE: [Repeater-Builder] Moto Moxy help!
George, If you can provide the complete model number, I'll see if I have documentation for it. My Moxy model list shows only 10, 20, and 45 watt PAs. Are you certain it had a 55W PA? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of ka3hsw Sent: Monday, February 19, 2007 7:24 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Moto Moxy help! Arrg!!! I just sold an old high-band Moxy on eBay, and now can't seem to locate the service manual I promised to send with it Anybody got a scanned version? Mostly in need of the tuneup procedure (55-watt PA) Thanks! George, KA3HSW / WQGJ413
RE: [Repeater-Builder] NEED HELP FINDING DATA ON GE PE SERIES REMOTE UHF RECEIVER???
Augiust, What are the model and/or combination number(s) stamped on the PC board or on the case label? Once you have identified the exact model radio you have, we can determine what LBI covers it. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of August Sent: Monday, February 19, 2007 1:43 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] NEED HELP FINDING DATA ON GE PE SERIES REMOTE UHF RECEIVER??? I have purchased a GE PE series portable receiver neatly mounted in a an RF sealed case and now crystaled in the 458 MHz range. I am looking for info (the LBI would be nice) for this radio so I can learn the crystal formula and tuning instructions. Any help would be appreciated. Augiust W8MIA
RE: [Repeater-Builder] Re: Antennas that work both in commercial and amateur
-Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- [EMAIL PROTECTED] On Behalf Of Jim B. Sent: Monday, February 19, 2007 4:32 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Antennas that work both in commercial and amateur Right-slightly OT, for a mobile antenna, you will find that you can squeak out a bit more gain by using a .64-wavelength whip instead of a pure 5/8-wave (.625) In the late 60's/early 70's, the NewTronics BBL series VHF gain antennas were rated at an honest 4dB gain-and did it. The A/S VHF gain antennas measured about 2 dB. They were actually end-fed 1/2-waves... If you can find an original BBL-144 still in good shape after 30+ years, keep it! -- Jim Barbour WD8CHL Are you telling us that the difference in length between .64 wavelength and .625 wave length, a mere .015 (about 1.2 inches)amount, accounts for a full db of gain? End result: 4dB gain over a 1/4-wave (should've specified that part). Not sure whether it was a full dB over a 5/8-but that was the peak in the gain curve. How do you know they provided 4 db of gain? 73 Gary K4FMX Measured on their range-they used to be based in Cleveland, and my father was one of the designers. (anybody here remember the PRO-27JR 27Mhz antenna? Or the original 4BTV?) -- Jim Barbour WD8CHL With all due respect to your father Jim, I think that 4 db of gain is wishful thinking. A 5/8 wave length antenna theoretically is a little over 3 db and in real life 3 db is seldom realized. If I am not mistaken a .64 wavelength would have at most a tenth of a db advantage over a 5/8 antenna. 73 Gary K4FMX
RE: [Repeater-Builder] Re: Antenna gain specs
-Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- [EMAIL PROTECTED] On Behalf Of Laryn Lohman Sent: Monday, February 19, 2007 8:27 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Antenna gain specs --- In Repeater-Builder@yahoogroups.com, Paul Holm [EMAIL PROTECTED] wrote: Reading the replies that mentioned gain specs, I can't help but think of our last ham club meeting. An older member persuaded the club to replace the VHF repeater antenna with a Diamond X500HNA rather than a DB-224 because the Diamond has 8.3 dB gain. Yup, Paul, you've caught on. Diamond must be good; very good. They've bent the laws of physics again. Diamond's 18 ft. long antenna has more gain than a DB Products, Sinclair, etc., which are actually slightly longer. 8.3db gain over what? I'm here to tell you, in my humble opinion, that the Diamond's actual gain over a dipole is closer to 6dbd. Laryn K8TVZ It is also interesting to note that hardly any of the manufacturers of two way antennas actually have an antenna test range or have ever tested the antennas on a range. Most all the patterns that you see in the catalogs are computer generated. 73 Gary K4FMX
RE: [Repeater-Builder] Re: Antennas that work both in commercial and amateur
Measured on their range-they used to be based in Cleveland, and my father was one of the designers. (anybody here remember the PRO-27JR 27Mhz antenna? Or the original 4BTV?) -- Jim Barbour WD8CHL With all due respect to your father Jim, I think that 4 db of gain is wishful thinking. A 5/8 wave length antenna theoretically is a little over 3 db and in real life 3 db is seldom realized. If I am not mistaken a .64 wavelength would have at most a tenth of a db advantage over a 5/8 antenna. 73 Gary K4FMX There are a lot of unknown variables here, including, but not limited to the size of the ground plane the antennas were mounted on, their heights above the ground plane, the method of coupling to the ground plane (direct, mag mount, etc.), matching networks' efficiencies, etc.. And more importantly, was the 4 dB gain a peak value, or at 0 degrees elevation? Typically a 5/8 wave over a perfect ground plane should be a little more than 3 dB better than a 1/4 wave on the horizon, but with so many unknowns and so much variability in mobile installations, there doesn't seem to be a definitive conclusion to be drawn here. Maybe Jim can provide more detail. --- Jeff
Re: [Repeater-Builder] Repeater Time Out Award
Jim B. wrote: Look for 'Purple Xtal'... Another vote for PC ~ have actually seen a nice one: wall-plaque thingy, adorned with a VERY old and large xtal unit -- maybe 1.5 square 3/4 thick? (No, not a heater) Any current holder was held responsible for 'catching' the next recipient -- think 'hot potato' ;-) /.
Re: [Repeater-Builder] pc-board design program wanted
Thanks to all that replied Keith va3kmc Russ Wilson wrote: Hi I use DipTrace quite a lot. It is a relatively new program, includes schematic, pcb, components libraries with custom capabilities, autorouting. It comes as a free 30 day trial, a light version and the full version is about $500 or so, 1/10th of the big guys. Free to check it out. Made many boards with complicated networks and very small footprints and am quite satisfied. Also the customer service is outstanding. The author responds within hours usually to quesitons by the user. Since is it new (1-2 years old), there are many requests for features which are responded to whether positively or negatively. I am very happy with the product. I own the full version. Russ Keith [EMAIL PROTECTED] wrote: can any one recommend a good pc-board design program easy to use and free or cheap to buy ? thanks Keith VA3KMC
RE: [Repeater-Builder] Repeater Time Out Award
At 05:46 PM 02/19/07, you wrote: One of the local police departments here awarded one of their officers with the Golden Microphone Award, a Motorola Mic painted gold and affixed to a wooden plaque, after she unwittingly had her mic keyed while she sang Oh Mickey! You're so fine... in its entirety. This was presented at their annual awards banquet... Needless to say the incident - or any similar - was not repeated for quite some time. ;-) Mark - N9WYS I can just imagine this going over the air on a dispatch talkback channel... http://lyricsplayground.com/alpha/songs/m/mickey.shtml Years ago Ray Thill WA9EXP used to tell stories about t-hunting patrol cars in Chicago with bad or intermittent microphone cords... i.e. stuck PTT lines. He used to love to pull up behind a patrol car in his marked Chicago PD radio shop van and flip his wig-wag headlights on, then walk up to the officers and hand them a replacement palm microphone, and make some comments on what the cops were saying... something like I'm sure the captain appreciates the ancestral comments you were making about him they'd put his comment, their memory of what they were just saying, that and the new microphone they were holding together and get really concerned... then they'd let Ray swap the microphone and go back on patrol... and wonder what was awaiting them in the ready room Mike WA6ILQ
Re: [Repeater-Builder] Statistics
At 06:01 PM 02/19/07, you wrote: BTW the group was created on Feb 13 1999 Happy belated 8th birthday! Wow, has it really been that long? Remember eGroups, and OneList? Those are the other folks that run the mail servers before Yahoo! bought them out. Thanks everyone for a popular - productive list. Kevin Custer List Owner And what I find really interesting is the group has over 3,400 members despite having done next to NO promotion - except for one plug in the QST magazine, the growth is all word of mouth. Mike WA6ILQ
[Repeater-Builder] Problems With Diamond NR73BNMO
My Diamond NR73BNMO stopped working on 70cm. Tx rx are both fine on 2 meters, but the antenna will not tx or rx on 70 cm. I swapped the antenna with a spare, and everything works fine with the replacement antenna. Any ideas?
Re: [Repeater-Builder] Re: Antenna gain specs
Sometimes if you just ask the question Relative to what! All manufactures don't base there Gain spec on Unity Gain of a Dipole, Some have there own Base Spec , and nobody knows what it is , I am always leery of companies that tend to always have the most of everything . The Company I worked for bought some Fiberglass antennas that were supposed to be 6 - DB Gain a 1/4 wave Mobil antenna would out perform them we ended up junking them . Had to drive 200 Miles one way and change out 16 Antenna . The antenna that worked best for us was a commercial copy of the ringo ranger 3/4 wave length on bottom 1/2 wave length on top with hair pin between.
Re: [Repeater-Builder] Re: Antenna gain specs
At 2/19/2007 17:27, you wrote: --- In Repeater-Builder@yahoogroups.com, Paul Holm [EMAIL PROTECTED] wrote: Reading the replies that mentioned gain specs, I can't help but think of our last ham club meeting. An older member persuaded the club to replace the VHF repeater antenna with a Diamond X500HNA rather than a DB-224 because the Diamond has 8.3 dB gain. Yup, Paul, you've caught on. Diamond must be good; very good. They've bent the laws of physics again. Diamond's 18 ft. long antenna has more gain than a DB Products, Sinclair, etc., which are actually slightly longer. 8.3db gain over what? I'm here to tell you, in my humble opinion, that the Diamond's actual gain over a dipole is closer to 6dbd. Correct, which is 8.1 dBi. Diamond Comet use dBi. Bob NO6B
Re: [Repeater-Builder] Statistics
When you have a good thing, people will find out about it. When you have a GREAT thing, a LOT of people fill find out about it. Thanks for you hard work Kevin. Johnny Mike Morris WA6ILQ wrote: At 06:01 PM 02/19/07, you wrote: BTW the group was created on Feb 13 1999 Happy belated 8th birthday! Wow, has it really been that long? Remember eGroups, and OneList? Those are the other folks that run the mail servers before Yahoo! bought them out. Thanks everyone for a popular - productive list. Kevin Custer List Owner And what I find really interesting is the group has over 3,400 members despite having done next to NO promotion - except for one plug in the QST magazine, the growth is all word of mouth. Mike WA6ILQ Yahoo! Groups Links
RE: [Repeater-Builder] Re: station master bandwidth?
At 2/19/2007 17:44, you wrote: I tried this mod. with only slight variations, then compared the gain against my other antennas found it to be as expected given the antenna length. Bob, What was expected? Did it have the same gain as it had before the modification but now on the new frequency? 73 Gary K4FMX It was compared to antennas of nearly the same gain; the signal strength of several line-of-sight sources was identical. Bob NO6B
RE: [Repeater-Builder] Re: Antenna gain specs
At 2/19/2007 17:51, you wrote: I believe Diamond uses gain over **isotropic** (dBi) for their rating specs... which might account for the extra ~2.2dB. (If memory serves me the difference between dBi and dBd is about 2.2 - yes?) 2.12 dB, to be exact. This is one reason to be careful about what the respective company is using for their comparison... gain vs Isotrpoic or gain vs Dipole. I just assume that unless specified, the gain is in dBi. For me to interpret a claimed gain as referenced to a dipole, it must be stated as dBd. Bob NO6B
Re: [Repeater-Builder] Statistics
Yep. Joe M. (List member #5 as I recall) Kevin Custer wrote: Remember eGroups, and OneList? Those are the other folks that run the mail servers before Yahoo! bought them out.
RE: [Repeater-Builder] Problems With Diamond NR73BNMO
From: Tony L. [EMAIL PROTECTED] Reply-To: Repeater-Builder@yahoogroups.com To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Problems With Diamond NR73BNMO Date: Tue, 20 Feb 2007 03:55:26 - My Diamond NR73BNMO stopped working on 70cm. Tx rx are both fine on 2 meters, but the antenna will not tx or rx on 70 cm. I swapped the antenna with a spare, and everything works fine with the replacement antenna. Any ideas? It might be buggered ? _ Advertisement: Meet Sexy Singles Today @ Lavalife - Click here http://a.ninemsn.com.au/b.aspx?URL=http%3A%2F%2Flavalife9%2Eninemsn%2Ecom%2Eau%2Fclickthru%2Fclickthru%2Eact%3Fid%3Dninemsn%26context%3Dan99%26locale%3Den%5FAU%26a%3D23769_t=754951090_r=endtext_lavalife_dec_meet_m=EXT
RE: [Repeater-Builder] Repeater Time Out Award
I got 138,000 results when I Googled Purple Crystal... Purple Xtal came back with 0 (zero). Most were about jewelry. Mark - N9WYS -Original Message- From: Repeater-Builder@yahoogroups.com On Behalf Of [EMAIL PROTECTED] Jim B. wrote: Look for 'Purple Xtal'... Another vote for PC ~ have actually seen a nice one: wall-plaque thingy, adorned with a VERY old and large xtal unit -- maybe 1.5 square 3/4 thick? (No, not a heater) Any current holder was held responsible for 'catching' the next recipient -- think 'hot potato' ;-) /. Yahoo! Groups Links
[Repeater-Builder] Antenna Gain Specification - dBi versus dBd
The Telecommunications Industry Association, an international organization which develops standards to which nearly all countries of the world have subscribed, has already taken steps to correct the misleading practice of indiscriminately using dBi where dBd is appropriate. According to TIA-329-C, published in 2003, base station antenna gain for less than 1 GHz shall expressed in dBd using a dipole antenna as a reference. Antenna gain for 1 GHz and above shall be expressed in dBi using a theoretical isotropic radiator as a reference. There are no exceptions. So, why are some manufacturers still using dBi for their 2m and 70cm antennas? There are probably several answers to that question, such as: 1. Perhaps most antenna buyers don't know the difference between dBi and dBd. 2. Perhaps most antenna buyers believe whatever the ad copy says. 3. Perhaps the company owner is an old-school believer that dBi is the only true gain unit. 4. Perhaps the antenna designer knows about TIA-329-C, but chooses to ignore it. It should be obvious that microwaves, which begin around 1 GHz, behave a lot like light and can be focused with a parabolic reflector. Short radio waves are easy to visualize as being generated by a point source, very much like a bulb in a parabolic flashlight reflector. Such point sources can be easily expressed as isotropic radiators, and the leap to dBi is logical. The wavelength of lower-frequency waves in the VHF and UHF spectra are not point sources, and it is illogical to expend any effort converting from one reference to the other. As several others have pointed out, there is about 2.14 dB difference between the absolute gain expressed as dBi and that expressed as dBd. Unfortunately, there will always be some fringe group that will argue until the end of time that dBi is the Nirvana of antenna gain expression. I doubt that the decision by the TIA to limit dBi as an antenna gain unit to 1 GHz and above will change their beliefs. Getting the antenna manufacturers to properly report the gain of their products is quite another thing. As previous posters have mentioned, some popular antennas are junk that has never been properly tested on an antenna range, resulting in ridiculously inflated and undocumented claims of performance. If clueless buyers believe the hype, nothing is likely to change. That's a shame- but hey, it's the American Way! 73, Eric Lemmon WB6FLY
