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Re: GE MASTER II DC control Card
edriddle
if you will contact gene diehl telephone 219 495 5715 he will sell you a
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complete master II for 45 dollars plus shipping which will have everything you would need to repair yours for a long time. he may have parts , you will have to check him. his email was and may still be n9lcf@... 73 ed n4ale At 01:40 PM 3/23/99 -0600, you wrote:
From: KF4TNP <Bug1@...> |
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Re: M400
tom oliver
I have done maratrac's with the m 400 software and no special keystrokes
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were required to take them into the ham bands just direct entry. tom n8ies Jim Horvat wrote: From: Jim Horvat <w8wrp@...> |
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Re: A Challenge.. / and another with a Mitrek
Alex Groza
Are the Red/Black wires still connected to the TX relay at the antenna
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connector? They should be cut. mch wrote: From: mch <mch@...>I wrote (originally):Then Joe Orrico WB6HRO wrote: |
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Re: A Challenge.. / and another with a Mitrek
mch
I wrote (originally):Then Joe Orrico WB6HRO wrote: But how would a receiver connected to an IFR differ in voltage from a receiver connected to a duplexer? In case I gave the wrong impression, the unit is still at the repeater site - the only change is that the RX antenna was 'pulled' from the duplexer and plugged into the IFR. The TX is still connected to the duplexer, and the power (both TX and supply) is exactly the same. It's as if the duplexer is severely mis-tuned. And since I didn't mention this either, it works flawless on a Mastr-II - RX sensitivity is great both direct and through the duplexer, so the duplexer is tuned correctly. (In fact, it has never been changed from the factory) I will check the voltages, though. The only problem is that the troubleshooting must be done at the repeater site. The duplexer is the one in normal use. This is almost like reverse desense - perhaps there was a slight spur when the TX was inactive that severely desensed the RX??? I didn't check that. Thanks for the response, Joe, KR3P |
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Re: Squelch on GE Mastr II
mch
There are jumper changes when you install/uninstall a CTCSS board. I
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know one is on the front/left side of the system board (with the handle facing you). That is the PTT control jumper that selects normal PTT vs Delayed PTT. With the jumper in the 'CTCSS' position, the unit will not transmit (using the PTT line) without the CTCSS board actually being in the unit. If you jump 10V to the oscillator control, the unit will TX anyway and this jumper doesn't apply since that point is after the jumper. I don't recall where the others are offhand. I don't have the manuals at home. Check the voltages at the points labeled RX MUTE - that's on the connector on the system board that is on the extreme right. SQ Disable should only disable CTCSS and should not itself open the squelch but RX MUTE will open the squelch. When squelched, RX MUTE is a logic low (0V). One word of caution if you don't already know - the label on that connector (J903?) is *usually* offset a little from the pins, so make sure you are looking at the correct pin. Well, back on topic, the unit should not open squelch just due to the removal of the CTCSS board. Unplug the board - the RX becomes CSQ with no jumper changes necessary. The RX MUTE (NOT CAS) will even work as a CSQ unit. Of course, CAS always follows the receiver regardless of CTCSS presence. Does the unit receive on the selected frequency? OH! Check your 10V supply! That could open the squelch. It has to be 10V +/- a few hundredths. I want to correct something I said earlier. I believe an *internal* squelch WAS an OEM option on a Mastr-II. It was rare, but I think I do remember seeing a unit that had one. The only control on the C/HD was volume and on/off. Ed Bathgate, RMA Repair Dept x8785 wrote:
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Re: Squelch on GE Mastr II
edriddle
the squelch circut is all ready there. you merely need to put in a pot to
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set it 73 ed n4ale look at the ge page on the internet and it will tell you where and how. At 04:11 PM 3/22/99 -0500, you wrote:
From: "Ed Bathgate, RMA Repair Dept x8785" <ed@...> |
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Re: Squelch on GE Mastr II
Ed Bathgate, RMA Repair Dept x8785
This is a mobile Mastr II, low band 48mhz. I have the
control head, and the squelch control changes a voltage on the plug in panel test point, but the receiver stays un squelched. I am assuming that an RF squelch was disabled if this unit was on a PL tone, is there a wire or jumper to disable the squelch? Ed N3SDO Ed Bathgate RMA Dept (724) 772-8785 pager (412) 649-6773 |
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Re: Squelch on GE Mastr II
KF4TNP
you can purchase one or build your own take a look at the NHRC web page
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under master II info Ed Bathgate RMA Repair Dept x8785 wrote: From: "Ed Bathgate, RMA Repair Dept x8785" <ed@...> |
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Re: Squelch on GE Mastr II
mch
If you mean a squelch operated relay, it was an option on the base
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units. You can hear that relay trip hundreds of feet away from the unit. If you mean an internal (to the drawer unit) squelch, I think there may have been one, but it is really easy to build - just use a 10K pot with the ends tied to Vol-SQ hi and low respectively, and the center tied to the point marked Squelch Arm. There is a company that sells plug in boards for the M-II mobile (or base, I guess) that has both the squelch and audio pots mounted. See: I haven't used that module myself. I prefer multi-turn pots in the squelch circuit for additional control (accuracy). Joe, KR3P (also near the 'Burgh) Ed Bathgate, RMA Repair Dept x8785 wrote:
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Down Time
Kevin K. Custer W3KKC
All subscribers,
Please be advised of the scheduled down time tonight. Kevin Custer W3KKC List Owner From: ONElist Tech Support Hello, The ONElist system will be down for scheduled maintenance this evening, Monday March 22, 1999. We will be off-line from 8pm to 10pm Pacific Time while we upgrade the system. That's 11pm to 1 am Eastern Time tonight. The ONElist Team |
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Re: Hamtronics, and diverging....
that youI was going to purchase some Hamtronics equipment, then I saw what you wrote I use a Hamtronics R-220 receiver here on my 224.66Mhz repeater and itcan point me to so I can read about the stuff? works OK. But, just OK, nothing special. You also have to remember that it is located here at my house and does not have to compete with much other interference or overload. I bought my R-220 used about 10 years ago. At that time, 220 equipment was hard to come by and some of the commercial 220 conversions were not developed yet (or, not publicized as we can now do on the Internet). My choice now would be to convert a commercial piece of gear. Or, buy one already converted if you are weak at heart to delve into the circuitry. If you do decide to do the conversion and are new at it, I suggest you buy two radios. One to use for spare parts in the future. They are usually not very expensive. About the only place I feel Hamtronics has a place is possibly on 222Mhz. And, that's only if you don't want to do some of the semi-difficult mods to a piece of commercial gear. You will have a "fair" repeater that will work OK at your house. Anything more than those expectations and you will probably be disappointed. I have a lot of other Hamtronics stuff laying around here. But, it's old controller stuff. Before the days of cheap microprocessor controllers, Hamtronics was the easiest way to go to build controllers, phone patches, etc. But. those days are long gone. I don't for see a long future for Hamtronics, unfortunately. 73, Joe K1IKE |
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Re: A Challenge.. / and another with a Mitrek
Joe Orrico WB6HRO
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One more quick thing on a Mitrek. I have one on 440 I duplexed that is deaf as a stump until the TX comes up. Then, the sensitivity is great! As soon as the tail drops, it goes back to being deaf. Here's the kicker: it ONLY does it when connected to the duplexer. It works flawless if I connect the RX to an IFR to test the sensitivity. Deaf in this case is 'you have to find the right spot to key it with the HT on-site!' Sooo... any ideas out there??? Joe M. Sounds the the diode that must be removed to keep the voltage on the rx is not correct, would suspect that rx voltage is not right during normal rx function. We have been using about 10 Mitreks for link radios on our 220 system. Joe WB6HRO |
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Re: Repeater-builder: Why?
Theodore M Leonard
Hi Chuk
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As you can see from the date,I am behind in my e-mail but I agree. best 73 Ted Chukgleasn@... wrote: From: Chukgleasn@... |
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Re: A Challenge..
Joe Orrico WB6HRO
From: Chukgleasn@...
OK, everyone, where are the real RF Hackers? Here's the challenge: Develop some new ways to build 220MHz repeaters. Well Chuk there are several things that don't make alot of sense. First if I can buy a G.E. Master II or MVP for $20-30 and mod it for 220, my only challenge is to build a 10 - 15 watt PA. I have used the 220 brick from RF Parts and didn't use a circuit board, just a solder type terminal strip and UT-141 hardline to and from the terminal strip. So with the brick and the xtals you have about $100 in it. Newer radios cost alot more and where is the gain in perfromance? My 2 cents worth anyway. We have about 6 220 MVP's at high density sites in the L.A. Basin. de Joe Orrico WB6HRO |
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Re: A Challenge.. / and another with a Mitrek
mch
Chukgleasn@... wrote:
I believe that would be the Delta, Delta-S, then Delta-SX (those are respectively crystal controlled, synthesized and wideband synthesized units) The -S would obviously be a better choice than the -SX for repeater use. BUT, if I recall correctly, virtually anything after the Micor/M-II era is rated at a poor duty cycle. (Except for the continuous duty repeaters, of course, that are still >$1K) As far as non-repeater use, I saw (@ Dayton a few years ago) someone with a 220 MHz GE MPA or MPD - I forget which. Anyway, I asked him how hard it was to convert, and he said a conversion would be very difficult. I mentioned that he seemed to have done it, and was told that it was produced that way from scratch. It seems he had the fortune of working at Lynchburg. (GE HQ if you don't know that) The radio was a prototype of a model that 'never would make production'. Lucky duck... Now, as for the comment about using newer /\/\ and GE/EGE radios for synthesized remote bases, I've heard a lot of people saying how it could be done with Syntors and such, but nobody seems to have the time to do it. :(( A Rangr or Maxtrac or Maratrac would make a kick-butt remote base! 8] All it takes is someone to capture and analyze a programming dump to the radio. The stored files (at least for the GEs) are simple hex conversions. If the dump is a pure dump of the file, that should be easy. /\/\ on the other hand has to confirm the model, S/N or what have you before dumping the data. We need a unit like the one GLB made that synthesized Micors - only processor based. It's probably infringing on some copyright, I suppose... (sigh) One more quick thing on a Mitrek. I have one on 440 I duplexed that is deaf as a stump until the TX comes up. Then, the sensitivity is great! As soon as the tail drops, it goes back to being deaf. Here's the kicker: it ONLY does it when connected to the duplexer. It works flawless if I connect the RX to an IFR to test the sensitivity. Deaf in this case is 'you have to find the right spot to key it with the HT on-site!' Sooo... any ideas out there??? Joe M. |
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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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