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Re: Hamtronics, and diverging....
Kevin K. Custer W3KKC
Chukgleasn@... wrote:
From: Chukgleasn@...For my unsolicited opinion on Hamtronics, Go here Kevin |
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Re: A Challenge..
Kevin K. Custer W3KKC
Jon Pearl W4ABC wrote:
I have to agree with Jon, When Motorola designed and built the Micor, they employed the best engineers that money could buy. This radio was developed as a part of Motorola's commitment to Americas Space Program. Money was not an object. I have peckered around with a lot of equipment, both older and new. The Micor line will either hold it's own or simply blow away the newer technology. I had recently had a chance to do some work on a newer Motorola MSF line repeater, their newer synthesized stuff. The Micor's specs, (over 30 years older in technology) simply blows away the receiver sensitivity. Why? The Micor was intended to work on a very narrow band from where it is tuned. Performance drops rapidly from this tuned point. In today's world where we require one radio to tune from DC to light, there is certainly a need for synthesized, processor tuned radios, but for a repeater where the frequency don't qsy often, the old slug tuned rigs cannot be beat. They are more sensitive, more selective, less susceptible to intermod, the squelch works better, I could go on and on. Lets face it, there has not really been any technology advances that make a 2 meter or 220 radio receive any better today than 20 years ago. The development in GaAs fet's only show performance enhancements from about 400 megs and above. Since the Micor and Mastr II radios are plentiful on the used market, we are now able to get first class radio technology for little to nothing. Just because this technology is old... it is not outdated. Kevin |
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Re: A Challenge..
Jon Pearl W4ABC
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From: Chukgleasn@... <Chukgleasn@...> To: Repeater-builder@... <Repeater-builder@...>; Repeaters@... <Repeaters@...> Date: Sunday, March 21, 1999 6:06 PM Subject: [Repeater-builder] A Challenge.. From: Chukgleasn@...Parts, then the PC board is $15. (I know, I'm starting to sound like the ham whofor the connectors! Guilty as charged!!!)How about it? The Mitrek has no "pork shop" (circulator);is a single board design; has fewer components. The "Micor" may well have been Motorolover's last "hurrah." The radio was expensive and probably over built for the times. Long ago when the Japanese started kicking our collective asses, Motorolover had to make some tough decisions. The answer came in the form of radios like the Mitrek and beyond. Makes a good remote base or linking radio, but there are so many other designs (READ Micor) out there more suitable for repeater service, why bother with looking for something different for the sake of something different? Later radios, Prom and RSS programmable's are neat, but the added expense involved for the sake of building up a single channel repeater can't be justified in my mind. Now if you had plans for a frequency/PL agile remote base, then something of this flavor, might just be your cup of tea. Jon Pearl W4ABC _________________________________________________________ "The people will not understand the importance of the Second Amendment until it is too late." -- Thomas Jefferson What's the next newer GE model? Come on, guys, let's get with it!!until someone posts " I woulda done it this way with a Fahrvergnugen F16 mobile, |
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Re: Hamtronics, and diverging....
This was posted to me privately, and I thought after I started my reply I
would send it on to the list...... -============================= Hello: I was going to purchase some Hamtronics equipment, then I saw what you wrote about it. What is your opinion on the equipment? Are there negative write ups that you can point me to so I can read about the stuff? I have not heard much negative about the equipment, but then I might have not talked to the right people. Thank You D.L. Hogdon ====================================== Well, I've never had the joy of doing anything Hamtronics. Looked at them longingly before I got into the professional two-way field, as a cheap way to put up a repeater. Lots of people in the listserver or other places will laugh at them tho. One in particular is Chris Boone, WB5ITT. He'll recommend a converted two-way radio in a heartbeat. Then again, he's been doing this stuff since, it seems, Christ was a corporal... I also don't know how far back the onelist archives go - if they're significant size, you might look in there. Otherwise, email Chris - he posts to the various reflectors often enough. I guess now that I've been thinking about it while writing this reply, I might sum it up like this: 1) Hamtronics equipment probably costs as much as or more than 'salvaged' two-way. And salvaged two-way you have to find a place to salvage from and get service literature, etc. A job in itself, that Hamtronics, et al. lets you take care of by just opening your wallet to them. You do get the satisfaction of building it yourself. 2) The designs are probably a little long in the tooth - on the old side, not much in the way of new or uniqueness. On the other hand, that might mean stable< ; why mess with a thing that works?3) Any number of other reasons that people on the list might post. Hey! How about FAQ re. buy/build decisions, etc.? I don't want to start flame wars; this is similar to anybody's fascination with Chevy/Ford/Dodge/etc. Some just comes down to personal preference; "De gustibus nil est disputandum" (apologies to all Latin-language lovers for the spelling!) "There is no arguing about taste" Everybody put some thought into it. Everytime a new person comes on with a question about "How do I .." and "Which is better, General Eccentric or Motherola or ...?" this has to be done again. Me, I'd offer more opinions, but I'm still just a young pup..... Chuk Gleason |
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A Challenge..
OK, everyone, where are the real RF Hackers?
Here's the challenge: Develop some new ways to build 220MHz repeaters. Here's why: Everyone has the GE ExecII and Micor VHF mobile mods all over the net. Can hardly get away from them. And I know there are strong opinions about Hamtronics, Spectrum, etc. Won't say which way they're strong, just that they're strong opinions. Besides, the Micor VHF PA, in words similar to what's written in the mod files, sucks wind at 220 and you have to run a Toshiba power module. Just the module is about $60.00 American from RF Parts, then the PC board is $15. (I know, I'm starting to sound like the ham who gets 7/8 inch hardline at 5% of cost then gripes about paying full price for the connectors! Guilty as charged!!!) How about some newer equipment? Say, Mitrek VHF. What's the next newer GE model? Come on, guys, let's get with it!! Anybody who comes up with an easy, elegant, way to do this with 'newer' equipment (how about hacking Motherola Maxtracs?) will win the praise and accolades of the other members of this list. For at least 35 minutes, until someone posts " I woulda done it this way with a Fahrvergnugen F16 mobile, this way....(Ya big dummy!!!! Why didn't ya think of that!!!!) : ) )" Chuk Gleason kb4mdz |
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Fw: 2M/70CM Repeater
"Tony Lelieveld" <[email protected]
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From: KA9SWI@... <KA9SWI@...> To: Repeater-builder@... <Repeater-builder@...> Date: March 18, 1999 13:53 Subject: [Repeater-builder] 2M/70CM Repeater From: KA9SWI@...repeater >that is already in operation. The 440mc machine will use the same antenna that is >going up soon (a GP-9). What is the best way to come off the hardline to get to both >sets of cavities? I was thinking of a 3/4 wave section of coax out of a "T" connector to >each cavity set. If this is used how critical is the length? HELLLLLLP!!!!! ------------------- Peter We have a UHF repeater and a VHF packet station on the same dual band antenna. At the bottom of the antenna feedline we have a Sinclair "diplexer". This is the same kind as is sold by "Comet" , "MFJ" etc. for combining a two meter and 70 cm. mobile rig into one antenna. The VHF output goes directly to the 2 Mtr. Packet radio, which is a no nonsense standard "Alinco" radio, and the UHF output goes directly to the UHF repeater duplexer antenna input. It has been on the air like this for at least 4 years and no extra filtering is needed in our case. There is one more two Mtr repeater and three commercial VHF repeaters on the same tower. This filter should cost you no more then about $40.00 and is worth the investment. If you try to do it with a "T" connector etc. I think you are asking for trouble. The diplexer is doing a good job of separating the 2 bands. Tony...Ve3DWI KA9SWI@... |
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Re: service literature
"\"BT\" a.k.a kc0edo"
Howdy,
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The manual that you seek, for the mobile UHF Micors runs $99 from Motorola, more than I paid for the 3 radios of this type to retune into repeaters. And no, I do not have access to a free copier and frankly these documents are very difficult with schematic diagrams and so on... 'SHOW ME THE MONEY' (hehhehe) -BT a.k.a KC0EDO list-owner of micor@... -----Original Message-----
From: bionoid@... <bionoid@...> To: Repeater-builder@... <Repeater-builder@...> Date: Thursday, March 18, 1999 5:24 PM Subject: [Repeater-builder] service literature From: bionoid@...literature on the web for the Micor uhf Elmer KB3WG |
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Re: 2M/70CM Repeater
Brent DeSalvo KF4TNP
well for what it is worth i am now using the diamond due to it has a removable
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cover on the back and allows repair if needed like on the center conductors of the N or SO-239 connectors thanks to the cover i did not have to purchase a new diplexer just fixed to solder joints and it is like new Brent KF4TNP w7ntf@... wrote: From: w7ntf@... |
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Re: 2M/70CM Repeater
Pete Lenges
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From: Kevin K. Custer W3KKC <kuggie@...> To: Repeater-builder@... <Repeater-builder@...> Date: Thursday, March 18, 1999 6:37 PM Subject: [Repeater-builder] Re: 2M/70CM Repeater From: "Kevin K. Custer W3KKC" <kuggie@...>HELLLLLLP!!!!! fine for this.Peter, I have a few repeaters that use dual and tri band antennas. Some areconfigured with one port as a repeater and one port simplex, some are two repeaters and a digi, some are all ports going to repeaters.
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Re: 2M/70CM Repeater
Kevin K. Custer W3KKC
KA9SWI@... wrote:
From: KA9SWI@...Peter, Get a Comet or Diamond dual band mobile duplexer (diplexer) they will work fine for this. I have a few repeaters that use dual and tri band antennas. Some are configured with one port as a repeater and one port simplex, some are two repeaters and a digi, some are all ports going to repeaters. Just get one with enough power handling capability. Kevin |
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Re: 2M/70CM Repeater
Pete Dulac
I'll tell what we are doing at one of our sites... depending on your power
output. We are using an actual COMET Tri-Plexer for our 2Meter / 220packet / 440link repeater site. And never have any desense or problems with them getting into each other. Maybe that'll work for ya ?? Pete Dulac, KC4WWU 147.285mhz. C.C.A.R.S. President PL 118.8hz ( 2B ) Camden County Sherrif's Dept. / Search & Rescue #1724 ICQ # - 69763 My Homepage: C.C.A.R.S. Homepage: Cinema 6 Homepage: |
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2M/70CM Repeater
I am putting up a 440 repeater with the 2M (147.300 Brown Co., Indiana) repeater that is already in operation. The 440mc machine will use the same antenna that is going up soon (a GP-9). What is the best way to come off the hardline to get to both sets of cavities? I was thinking of a 3/4 wave section of coax out of a "T" connector to each cavity set. If this is used how critical is the length? HELLLLLLP!!!!!
KA9SWI@... Peter J. Lenges 7658 Hummingbird Dr. Nineveh, In.46164 |
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Re: How do Decibel Products low band duplexers work?
John Hackman
The helical resonator/stub lowband duplexers work ... but that's about all
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you can say about them. It is real easy to end up with almost zero transmitter power out to the antenna and a nice, toasty warm duplexer, particularly with 250-400 watt Micor repeaters. They also provide ZERO isolation from interference and intermod-producing signals coming down the antenna line. 30-50 MHz cavities are not real common but can be found - 2 or 3 of those will make a very nice duplexer. TX-RX and Wacom also produce cavity duplexers. Or you can shop the spring garage sales for used hot water heaters and build your own! ......John WB4VVA -----Original Message-----
From: Ed Bathgate, RMA Repair Dept x8785 <ed@...> To: Repeater-builder@... <Repeater-builder@...> Date: Thursday, March 18, 1999 9:14 AM Subject: [Repeater-builder] How do Decibel Products low band duplexers work? From: "Ed Bathgate, RMA Repair Dept x8785" <ed@...> |
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Re: How do Decibel Products low band duplexers work?
Tedd Doda
Hi Ed:
On Thu, 18 Mar 1999 09:13:37 -0500, Ed Bathgate, RMA Repair Dept x8785 wrote: Ok, can I build a similar device?Probably, as the inside is simple, but look around for a used one. As more and more government/business's get away from the low band, they will become easier to find. How can they get a small can to do 6 meters?Ah...the wonders of helical resonators! You have to remember that these "cans" can only be set up for NOTCHING a frequency, and not PASSING a frequency. Look at any good commercial 2 meter or UHF radio. The small square blocks near the antenna are helical resonators. What is inside the 'paint cans'?A coil of wire (the helix) and a plunger on a threaded rod which tunes the helix to the frequency of choice. I already know of the heliax stub duplexer design...Most of the heliax stubs are 1/4 wave length long, and do basically the same as a helical resonator. The shorted and opened stubs are there for usually the "C" part of the "LC" circuit (creating the "50 ohm" in/out). Tedd Doda CET packet va3sed@va3sed e-mail lazer@... |
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How do Decibel Products low band duplexers work?
Ed Bathgate, RMA Repair Dept x8785
I was researching 6 meter band antennas & duplexers, and came across
Decibel Products. They have a design of a duplexer that can do a .5mhz split and its only 30" high. It uses what appears to be 6 tunable paint cans, (???!) and several sets of tuned length coax lines and several coax stubs. I have rebuilt and re tuned a hybrid ring duplexer for 2m, and old sinclair, that looked like 4 scuba tanks and a whole lot of coax. I was intrigued by their design, until I called them and got the $2300 price! Yeowza!! Ok, can I build a similar device? How can they get a small can to do 6 meters? What is inside the 'paint cans'? I already know of the heliax stub duplexer design... I know a fellow who was selling his, it does not work well according to him. I know where I can get paint cans cheap... 73 Ed N3SDO Ed Bathgate RMA Dept (724) 772-8785 pager (412) 649-6773 |
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Re: Voting System
Adam C. Feuer
First I've seen of the LDG Voter. I use Spectratac and GE. Will this voter
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work with Status Tone Receivers ?? Adam N2LKV Afeuer@... -----Original Message-----
From: w7ntf@... [mailto:w7ntf@...] Sent: Wednesday, March 17, 1999 19:05 To: Repeater-builder@... Subject: [Repeater-builder] Re: Voting System From: w7ntf@... Try this URL: LDG has a very spiffy voter which can be stacked to get more ports if necessary. Good luck! 73, de Gary, W7NTF ------------------------------------------------------------------------ To unsubscribe from this mailing list, or to change your subscription to digest, go to the ONElist web site, at and select the Member Center link from the menu bar on the left. ------------------------------------------------------------------------ This list is sponsored by the owners and users of "RBTIP" |
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Re: Voting System
Harold Eller
Ken Califf wrote:
HI You got a phone number on the LDG Voter Harold KD4JFN kd4jfn@... |
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Re: Voting System
Ken Califf
I have an LDG voter I am selling. It is already built in nice rack mount
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enclosure with feed thrus on all logic lines in and out of the enclosure. I dont have the necessary sites for using it. I am asking $200 for it complete with manuals. The Lacko's wrote: From: "The Lacko's" <Lacko@...> |
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