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by DAL-COM
Mon Apr 19, 2004 11:55 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Minitor 3 knobs
Replies: 1
Views: 578

Minitor 3 knobs

I would like to remove the vol knob from one M3 and install it on another M3. I can't figure out how to remove the knob. Can someone tell me the trick? If you have to open the case, I will just send it out. I always seem to break the case as I open it.
Thanks.
by DAL-COM
Tue Feb 24, 2004 8:47 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: antenna SWR
Replies: 3
Views: 1246

antenna SWR

While working on the previously mentioned VHF MTR2000, I checked forward and reflected power in the antenna feedline. It was 72W forward and 8W reflected which I calculated to mean an SWR of 2:1. This seems excessive to me, what do you Batlabbers think? I did not have time to climb the tower to look...
by DAL-COM
Tue Feb 24, 2004 8:28 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: MTR2000 question
Replies: 5
Views: 1833

OK, then I will need to build a preamp I guess. Unless I can talk GD into making the SINAD more sensitive......

Thanks
by DAL-COM
Sun Feb 22, 2004 9:15 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: MTR2000 question
Replies: 5
Views: 1833

MTR2000 question

Today I worked on my first MTR2000, without manual as usual. I wanted to take the speaker audio and run it into my analyzer that has an automatic 12dB SINAD feature, it's very convenient. But the audio level from the 4-pin modular jack (SPKR) behind the front cover is too low at about 100mV. I need ...
by DAL-COM
Fri Jan 30, 2004 9:07 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Maxtrac problem- logic board?
Replies: 6
Views: 1244

I can try a different head.
How do you spot an EPROM? By part number?
How do you re-initialize it? With RSS?
by DAL-COM
Wed Jan 28, 2004 9:00 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Maxtrac problem- logic board?
Replies: 6
Views: 1244

Maxtrac problem- logic board?

Calling all Maxtrac experts. I have a D34LRA73xxx that was donated to the local ham club, they want to use it as a link radio. I offered to test and program it for free. Problem is that it does not TX or RX, neither the CH button nor the MON button work. The two LEDs are on constantly. I followed th...
by DAL-COM
Thu Jan 22, 2004 6:23 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Minitor III mode switch problems
Replies: 6
Views: 801

Anyone know the UPS account number for Moto pager repair? I need to send a couple in.
Thanks.
by DAL-COM
Wed Jan 21, 2004 8:25 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Minitor 3 disassembly
Replies: 3
Views: 3028

Well, I tried for half an hour and could not release the tabs. I must be missing something. The tabs seem to be part of the inner battery case not the outside case.
Thanks.
by DAL-COM
Tue Jan 20, 2004 10:05 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: repeater desense problem
Replies: 23
Views: 6277

Well, I made up all new jumpers with RG214, checked them for VSWR, and put them in place of the RG8. No difference. I still get 0.9uV measured at the duplexer ant port. Next up I will try a replacement duplexer, a WACOM 642. If that does not help, I must have a measurement problem.
by DAL-COM
Tue Jan 20, 2004 9:31 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: repeater desense problem
Replies: 23
Views: 6277

Well, I made up all new jumpers with RG214, checked them for VSWR, and put them in place of the RG8. No difference. I still get 0.9uV measured at the duplexer ant port. Next up I will try a replacement duplexer, a WACOM 642. If that does not help, I must have a measurement problem.
by DAL-COM
Sat Jan 17, 2004 10:19 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Minitor 3 disassembly
Replies: 3
Views: 3028

Minitor 3 disassembly

I have a couple of Min 3's with various problems. How do you open the case without disfiguring it?
Thanks
by DAL-COM
Thu Jan 15, 2004 2:25 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: two-tone decode on mobile
Replies: 7
Views: 2304

Humhead, can you give me the p/n of the option board I need for the M1225? Is it just a tone decoder, or more than that?
Thanks
by DAL-COM
Wed Jan 14, 2004 9:13 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: two-tone decode on mobile
Replies: 7
Views: 2304

two-tone decode on mobile

I would like to set up a VHF mobile in a firehouse with one channel programmed to be muted until the right two-tone pair is received, then to go carrier squelch for a specified period, and then auto-reset. The other channels would be programmed without two-tone, mostly carrier squelch. It appears th...
by DAL-COM
Fri Jan 09, 2004 9:16 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: VHF trunking portable?
Replies: 2
Views: 528

VHF trunking portable?

Who makes VHF trunking (Passport/LTR) portables? I am told that Kenwood does. Is the market really growing? Not many channels free on VHF.....
by DAL-COM
Fri Jan 09, 2004 10:49 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Question on Transmitting between (174-178)VHF In USA Illegal
Replies: 16
Views: 3197

Kurt, you have explained what I have seen here. There are vehicular repeater frequencies in use that do not appear on any agency licenses in the database. I really should get familiar with 47CFR90......
Bernard.
by DAL-COM
Fri Jan 09, 2004 10:25 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: OT: Kenwood question
Replies: 2
Views: 506

tvsjr, you are correct. My brain went to lunch last night. The SW is v3.01, the DOS version. (Is there a Win version?) I could not figure out how to make the TK780 scan behave in mixed mode, so I am going to run it in conventional mode for a year or two. By then the system will go Passport I am told...
by DAL-COM
Thu Jan 08, 2004 8:51 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: OT: Kenwood question
Replies: 2
Views: 506

OT: Kenwood question

When programming a TK780H you get to choose either 136-162 or 146-174. If I pick the former I get a mixed trunked/conventional setup screen. Pick the latter and I get a simple conventional only screen. Why these frequency splits? BTW this is a Passport-enabled unit.
Thanks.
by DAL-COM
Thu Jan 08, 2004 10:30 am
Forum: Base Stations, Repeaters, General Infrastructure
Topic: repeater desense problem
Replies: 23
Views: 6277

Bob, I am not looking at replacing any internal harness cables of critical length, just the external jumpers. They have two 6 ft jumpers and an isolator in the tx path. One 6ft jumper in the rx path. They don't need to be that long. I would hope the external jumpers are not critical length. I got so...
by DAL-COM
Thu Jan 08, 2004 10:16 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: M4 pager programming question
Replies: 8
Views: 1120

Dave, I don't understand the difference between revert-n and delayed-n, can you explain?
thanks
by DAL-COM
Wed Jan 07, 2004 11:13 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: repeater desense problem
Replies: 23
Views: 6277

I had a chance today to make some more measurements. As stated the receiver sensitivity is 0.25uV, measured directly into the RX jack, with a dummy load on the TX jack. So today I disconnected the antenna from the duplexer ANT and replaced it with the monitor in duplex mode. Sensitivity was reduced ...
by DAL-COM
Wed Jan 07, 2004 10:45 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: M4 pager programming question
Replies: 8
Views: 1120

TPG, the revert-n did the trick. Thanks for all the info.
BTW will this M4 SW and HW work for the M3?
by DAL-COM
Wed Jan 07, 2004 7:40 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: M4 pager programming question
Replies: 8
Views: 1120

Well, lets hope they don't retire you anytime soon. We may need your expertise again. In fact, today we asked for a tone test to make sure the M4's work. They work just fine on my service monitor. They work fine on dispatch tones, except they don't store the voice message. This is probably because d...
by DAL-COM
Wed Jan 07, 2004 11:08 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: M4 pager programming question
Replies: 8
Views: 1120

Thanks Dave, when they say "user" do they mean dealer, not customer?
I also wonder if Moto reads this stuff- but I doubt it.
by DAL-COM
Tue Jan 06, 2004 8:07 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: 110 watt Spectra as a repeater turned down to 60 watts?
Replies: 13
Views: 2202

FM is notoriously inefficient, I still think AC-SSB with pilot tone would have been better. (Especially for tactical or SAR use)
Anyway, is it possible on a Spectra to weld a bigger heatsink (more area) on to the existing heatsink? Then a few 110V fans would do the trick in a 25 deg C ambient.
by DAL-COM
Tue Jan 06, 2004 7:45 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: M4 pager programming question
Replies: 8
Views: 1120

M4 pager programming question

Programmed my first M4 pager today. Pretty straightforward once you know about the Read Mode.

What is the use of the Call Options: eg code R130, R486 etc?

Thanks
by DAL-COM
Mon Jan 05, 2004 5:46 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: duplexer design curves for Moto?
Replies: 6
Views: 1687

Hartley, you are all right! If I can get anything from Vertex or Icom I will let you know.
by DAL-COM
Mon Jan 05, 2004 12:05 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: duplexer design curves for Moto?
Replies: 6
Views: 1687

Hallo Hartley, you would think this info would be available from all the vendors, but it might be tough. Any chance you could send me a photocopy, or scan it and email it?
I will pm you in any case.
Thanks.
by DAL-COM
Mon Jan 05, 2004 7:52 am
Forum: Base Stations, Repeaters, General Infrastructure
Topic: duplexer design curves for Moto?
Replies: 6
Views: 1687

duplexer design curves for Moto?

In the back of the Telewave catalog are some duplex curves for the GE MastrII. They show how much filter attenuation you need for 1dB max desense for a given frequency offset. There are two curves: 1)one curve is for the transmitter noise sidebands as a function of frequency offset. 2) another curve...
by DAL-COM
Sun Jan 04, 2004 9:46 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Palm software
Replies: 0
Views: 299

Palm software

Has anyone found Palm software that would be useful to someone working in the wireless communications field? Just got a Palm Tungsten E. I did buy CalcPlus for it, great program.
by DAL-COM
Sun Jan 04, 2004 9:35 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: simulcast ability
Replies: 1
Views: 1067

simulcast ability

Which Moto repeaters have an external clock input to enable carrier phase locking for simulcast? I would guess Quantar and MSF5000? Am I right?
Thanks.
by DAL-COM
Mon Dec 29, 2003 10:13 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: repeater desense problem
Replies: 23
Views: 6277

Nand, that looks exactly like the cans in the cabinet. All of the harness inside the cabinet is RG8/U (black) except the tee which is exposed braid cable. Outside of the cabinet everything is RG8/U except the feedline which is 7/8 heliax. Jim, your comments on duplexer rehab are interesting, I may a...
by DAL-COM
Mon Dec 29, 2003 11:15 am
Forum: Base Stations, Repeaters, General Infrastructure
Topic: repeater desense problem
Replies: 23
Views: 6277

I agree, the jumpers are next, if the desense test is positive. You mention the duplexer harness, I was wondering about that. It seemed to me that a a bad leak of tx into rx inside of the duplexer would explain the symptoms last time. The tee of the duplexer is made of exposed-braid cable, hard to s...
by DAL-COM
Sun Dec 28, 2003 11:04 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: repeater desense problem
Replies: 23
Views: 6277

You both have raised many good questions, and I will do some more checking. (With blinders off, Jim). Nand, you are correct the monitor has a dummy load and will run duplex. Yes, there is some cycling with a weak signal. No, I don't want to open the radio and cut the COS. From memory, here is the ph...
by DAL-COM
Sat Dec 27, 2003 11:31 am
Forum: Base Stations, Repeaters, General Infrastructure
Topic: repeater desense problem
Replies: 23
Views: 6277

I agrre that RG-214 would be a better choice, that is on my list of things to do. I am so far unable to flip the the transmitter on and off because being a mobile radio there is no switch. I suppose if I had the SW I could program a channel with zero output power. That was why I used dummy loads to ...
by DAL-COM
Fri Dec 26, 2003 9:37 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: repeater desense problem
Replies: 23
Views: 6277

repeater desense problem

While checking a repeater I found what appears to be 7dB of desense. I cannot figure out why, so any help is appreciated. The agency said it had gradually gone "deaf". So on Xmas eve I quickly checked the rx sensitivity with the tx terminated in a good quality dummy load, and measured 0.25...
by DAL-COM
Fri Dec 26, 2003 8:44 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: 2712 vs 492 analyzer
Replies: 3
Views: 1225

Hallo Richyradio, thanks for the info, you obviously have a lot of 492 operation in the past. I would appreciate any info regarding options and mods vs serial numbers. I do have a service monitor that is pretty good at frequency measurement (GD2590 with OCXO) but it seems to be easily overloaded in ...
by DAL-COM
Thu Dec 25, 2003 10:45 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: 2712 vs 492 analyzer
Replies: 3
Views: 1225

2712 vs 492 analyzer

It has been a long time since I used either the Tek 492 or 2712 SA and wondered if anyone had a preference for either and why? looking for a good used one, not sure which yet.
Thanks
by DAL-COM
Sat Dec 20, 2003 9:45 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: FCC Licensing Help!
Replies: 21
Views: 3614

W7COM, you do have a dry sense of humour.
by DAL-COM
Wed Dec 17, 2003 4:53 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: [ Moderated ]
Replies: 3
Views: 595

[ Moderated ]

[ Moderated ]




Please read the rules !

<>The sale or trade of Radio Service Software (RSS)
Monty
by DAL-COM
Sat Dec 13, 2003 9:15 am
Forum: Base Stations, Repeaters, General Infrastructure
Topic: TAIT
Replies: 0
Views: 867

TAIT

Has anyone had experience with Tait T800 repeaters? Please PM me if you have, good or bad.
Thanks.
by DAL-COM
Fri Dec 12, 2003 10:28 am
Forum: Base Stations, Repeaters, General Infrastructure
Topic: doug hall 4RV and Micor?
Replies: 2
Views: 1246

doug hall 4RV and Micor?

How hard is it to interface a Doug Hall 4RV voter to a Micor repeater? It might be a MSR2k, not sure of the differences, will get the s/n later. I would like to hear from someone that has done it successfully.
Thanks.
by DAL-COM
Sun Nov 30, 2003 6:13 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: touch-screen dispatch suggestions needed
Replies: 14
Views: 2854

I checked and yes they are also looking at Zetron. I am not researching Zetron because there is already a dealer here.
The point about backup for encoders and radios is a good one, and I will keep that near the top of the list.
by DAL-COM
Sun Nov 30, 2003 6:05 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: paging system design
Replies: 3
Views: 1303

A while ago I sold some Nova pagers to a department that had used Minitor 2 for years. The Nova is similar in design to a Minitor 2 so I expected them to work, where a Minitor 3 would not. Bench tests confirmed that (at least in my crude fixture) the Nova was more sensitive than the 3, but not as go...
by DAL-COM
Sat Nov 29, 2003 10:26 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: paging system design
Replies: 3
Views: 1303

paging system design

When designing a fire paging system, what should the minimum field strength be? For instance what does Moto require for its Minitor 4 pager?
Thanks
by DAL-COM
Sat Nov 29, 2003 10:09 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: touch-screen dispatch suggestions needed
Replies: 14
Views: 2854

ISPTECH, I will pm you for more details. No sense in burning up bandwidth here.
by DAL-COM
Thu Nov 27, 2003 9:01 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Dumb question. Why always 16 Channels on portables?
Replies: 16
Views: 1982

I have to add that the Vertex 800 and 900 portables can also do this, thereby giving you 512 channels.
The Icom F30 also can do it giving you 250 channels.
16 channels might be inadequate for interoperability. Sounds like a grant application..........
by DAL-COM
Thu Nov 27, 2003 7:31 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: duplexer mystery
Replies: 10
Views: 2402

I don't have much hair left to pull. After reading the Repeater-Builder site, I was ready to give up on the jumper lengths. Probably the thing to do is go find an identical unit and measure them.
by DAL-COM
Tue Nov 25, 2003 10:59 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: simplex repeater
Replies: 9
Views: 2417

Perthcomm, sounds interesting, will pm.
by DAL-COM
Tue Nov 25, 2003 10:53 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: duplexer mystery
Replies: 10
Views: 2402

I see that I made a typo in my first post- it was a DB4075 or possibly a 4076 but I don't know the difference. Nand: You are right, to replace the second wattmeter you would need either a section of airline same length as the Bird, or a shorter piece of cable or coupler of lower velocity factor. The...
by DAL-COM
Tue Nov 25, 2003 7:14 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: maxtrac cloning problem
Replies: 1
Views: 355

maxtrac cloning problem

This is a dumb question I suspect, but how do you make a maxtrac accept a codeplug from another radio? (ie clone) I can do this on every other moto product but maxtrac. I get the "serial number mismatch" error. I have read the help file but I don't get it.
Help please.

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