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6 meter repeater..
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edriddle
the ge master II is the best choice i think. look on the web as there is a
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complete set of instructions to modify your rsdio. also look up the nhrc repeater controller. if you just search yahoo for nhrc it will come up and i think there is a link to the ge master II 73 ed n4ale At 12:50 PM 2/24/99 -0500, you wrote:
From: "Tedd Doda" <lazer@...> |
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Tedd Doda
Hi People:
I'm looking for information on modifing either a tube final GE Master, or a mobile Canadian GE MC74XC833A (100 watt mobile, Master II I think?)for repeater use. Which would be the better choice? I also have a Mitrek...would this be better for use in a repeater? This is my first 6 meter repeater project, and I would like to hear any thoughts on what to use. I have DB products duplexor (6 can helical resonator, notch) to use and is all tuned up and ready to go. All I have to figure out is what radio to use and how to modify it for duplex operation. Thanks kindly, Tedd Doda CET packet va3sed@va3sed e-mail lazer@... |
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John Hackman
I'd use the Mitrek - why beat your brains out building fan cooling, etc. for
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the GE's and then have the recurring expense of replacing the driver and final tubes? In addition, the mobile power supplies are intermittent duty, so you'll have to build a high voltage power supply, as opposed to hooking up a deep cycle marine battery and an el cheapo battery charger to the Mitrek. Regards, .......John WB4VVA -----Original Message-----
From: Tedd Doda <lazer@...> To: Repeater list <repeater-builder@...> Date: Wednesday, February 24, 1999 12:47 PM Subject: [repeater-builder] 6 meter repeater.. From: "Tedd Doda" <lazer@...> |
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Ray Vaughan
At 04:45 AM 2/24/99 -0500, you wrote:
From: edriddle <edriddle@...>To be exact: The Mastr II link is at the bottom. Ray J. Vaughan, MS, CBTE KD4BBM ray@... |
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Tedd Doda
On Wed, 24 Feb 1999 04:45:45 -0500, edriddle wrote:
the ge master II is the best choice i think. look on the web as there is aThanks Ed. The sites address is: Great stuff, and it looks very easy to do the mod's. The Master II is tuned up on 52.525, so it shouldn't take much to get it up to 53.27 (-1 Mhz). Tedd Doda CET packet va3sed@va3sed e-mail lazer@... |
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Tedd Doda
On Wed, 24 Feb 1999 14:34:41 -0500, John Hackman wrote:
I'd use the Mitrek - why beat your brains out building fan cooling, etc. forThat's the kind of information I was after. I thought having tube outputs would make it tougher? Only the old Master (1?) base unit has tubes, the Master II (mobile) is solid state. Any comment on RX sensitivity over the Master II, and the Mitrek? The donor Master II is still on 42.something, so I can't really do a fair evaluation, unless they are both inband, but I don't want to waist time (money) on rocking the MasterII if the Mitrek is more sensitive. Thanks for the help... Tedd Doda CET packet va3sed@va3sed e-mail lazer@... |
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John Hackman
Actually, at 6M receiver sensitivity is not an issue unless there's been a
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lightning strike - the real thing to look for is, which if either unit has an RF noise blanker? The Motorola "Extender" is a terrific noise blanker that will remove all but the most horrendous of impulse noises that otherwise would destroy weaker received signals. I expect GE has something similar, but I don't know what it's called. This will make a very great difference in the operation of your repeater. Regards, .........John WB4VVA -----Original Message-----
From: Tedd Doda <lazer@...> To: repeater-builder@... <repeater-builder@...> Date: Wednesday, February 24, 1999 6:09 PM Subject: [repeater-builder] Re: 6 meter repeater.. From: "Tedd Doda" <lazer@...>for the GE's and then have the recurring expense of replacing the driver andThat's the kind of information I was after. I thought having |
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Tedd Doda
Hi John:
On Thu, 25 Feb 1999 01:22:02 -0500, John Hackman wrote: I expect GE has somethingHow do I find out? I used the Mitrek on 52.525 with a bunch of computers in the area, and found it to be quite quiet. My Alinco DR-M06 is horrible at noise rejection on the other hand. Both radios hooked to the same antenna (not at the same time, hi!) shows the Mitrek has a fantastic Receiver. From all the replies I received, I get the impression that either the Master II or the Mitrek will work well. A couple other questions..... I purchased a commercial 1/4 wave ground plane antenna. From experience, will this suffice for the repeater, or should I look around for a better solution? The antenna will be mounted about 140 feet above ground feed with 1 5/8" heliax. I've been looking around but can't find any side mounted dipoles for 6m. Is there some other design I should look at. The DB product duplexor has been tuned up and I got about 91 Db isolation from TX to RX. What would you recommend for maximum TX power, to keep desence to a minimum? After visiting the Master II mods page, they said that the transmitter doesn't like going below 40% of maximum TX power, and it's a 110 watt unit. Therefore, the minimum power I should set it to is about 40 to 45 watts. Is that too much? Ideas? Tedd Doda CET packet va3sed@va3sed e-mail lazer@... |
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John Lloyd
Tedd,
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The Mastr II solid state is a much better radio for repeater use. You could use one of the others, but I would choose the Mastr II. John, K7JL --------------- Tedd Doda wrote: From: "Tedd Doda" <lazer@...> |
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John Lloyd
Tedd,
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GE also has a version of the Motorola "extender" for Low Band. DB Products makes a Low Band Loop Dipole that can be side mounted on a pole or tower leg. It is a DB-212. They also make a directional antenna with 1 director, the DB-225 for 5 db of gain. Db's phone number is 800-676-5342. I would run around 50 watts with that PA. Your Transmitter duty cycle will depend on how hot the PA gets. You will need to check your system for desense when you get it all hooked up. Reduce your power until the desense goes away! Or add more isolation to your duplexer or use split antennas. John Lloyd, K7JL ---------------------- Tedd Doda wrote: From: "Tedd Doda" <lazer@...> |
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