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Search found 85 matches

by Karl NVW
Wed May 16, 2018 1:01 pm
Forum: Legacy Batboard Motorola ASTRO (VSELP/IMBE/AMBE) Equipment Forum
Topic: P25 X2 Technical Specifications
Replies: 4
Views: 922

Re: P25 X2 Technical Specifications

A valid point but since the original query was from 2014 I think we should leave this until the OP renews the request. I KNOW I should have!
by Karl NVW
Mon Apr 30, 2018 10:27 am
Forum: ASTRO Series (Astro Saber, Spectra, XTS3000/3500) Subscribers
Topic: Off the Fly Adjustment
Replies: 11
Views: 387

Re: Off the Fly Adjustment

If the receiver is off-freq by over 600 Hz, the Rx sensitivity / error correctibility for ASTRO25 codewords begins to fall off quickly.
by Karl NVW
Mon Apr 30, 2018 10:13 am
Forum: Radio Programming
Topic: MOTOROLA MTX 838 with no MDC signaling enabled inside the RSS
Replies: 1
Views: 335

Re: MOTOROLA MTX 838 with no MDC signaling enabled inside the RSS

If I recall correctly, the 838 was a non-USA trunking radio that did not include or need to use MDC signalling.
by Karl NVW
Sat Apr 28, 2018 6:05 pm
Forum: Consoles
Topic: MCC7500 Questions
Replies: 7
Views: 665

Re: MCC7500 Questions

You are about to realize that some signalling features that work over simplex channels with analog modulation don't work the same, if at all, on a P25 backbone. Most of those you identified will function in a significantly different fashion. Your department's technical and operational experts must b...
by Karl NVW
Sat Apr 28, 2018 5:41 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: Harris XG75 1-Way Crossband Repeat to CDM1250
Replies: 6
Views: 689

Re: Harris XG75 1-Way Crossband Repeat to CDM1250

Sorry for stomping on toes, it won't happen again. I didn't realize that content of the FCC rules was board-dependent.
by Karl NVW
Sat Apr 28, 2018 5:26 pm
Forum: Legacy Batboard Motorola ASTRO (VSELP/IMBE/AMBE) Equipment Forum
Topic: P25 X2 Technical Specifications
Replies: 4
Views: 922

Re: P25 X2 Technical Specifications

It would have been 64 bit, but that won't matter since virtually ALL X2 radios were flashed up to real Phase 2 during rebanding. The only X2 radios still existing in the wild would be LSS.
by Karl NVW
Tue Apr 24, 2018 12:42 pm
Forum: Converting Motorola Equipment to 900MHz Amateur
Topic: Need help hex edit patmobile 900mhz
Replies: 2
Views: 465

Re: Need help hex edit patmobile 900mhz

Nothing sneaky about it, just read tthe FCC Rules. That's receive for the lowest FCC-allowed operating channel in the 900 MHz trunking band. The ISM band is 902 to 928.
by Karl NVW
Tue Apr 24, 2018 12:01 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: Harris XG75 1-Way Crossband Repeat to CDM1250
Replies: 6
Views: 689

Re: Harris XG75 1-Way Crossband Repeat to CDM1250

You and your dept chief both do understand that ANY SIGNAL appearing on your 700 MHz TAC1 will be transmitted on the HB channel, even if there is an emergency conversation already in progress? I doubt that operation will pass muster with your state SCIP; I know it would be rejected by the APCO commi...
by Karl NVW
Thu Apr 19, 2018 3:17 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: Achieving 360° Coverage On Side Mount Antennas
Replies: 2
Views: 2642

Re: Achieving 360° Coverage On Side Mount Antennas

You will always have reflections and attenuation when the tower is larger in width than 1/4 wavelength. So put the antenna on the side where you need to talkfurthest, then hope for the best, OR Buiild a new 100 ft tower so that the DB222 antenna can mount at the top without being shadowed by the tow...
by Karl NVW
Wed Apr 18, 2018 6:16 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Maxtrac 144-174 split?
Replies: 5
Views: 773

Re: Maxtrac 144-174 split?

The ones I remember might not have had FCC T/A, they were being used in other countries.
by Karl NVW
Wed Apr 18, 2018 6:12 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Motorola 208A/B TNC...
Replies: 5
Views: 288

Re: Motorola 208A/B TNC...

No 208A/B manual in the library here for at least 20 years. In theory you could connect a 2400 baud remote device to its terminal over a 4-wire analog leased circuit, except that most phone companies no longer lease point-to-point conditioned copper pairs. But you might find a compatible modem in th...
by Karl NVW
Tue Apr 17, 2018 1:15 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: CDM1250 Power Pin Short
Replies: 4
Views: 320

Re: CDM1250 Power Pin Short

1. Power supply not capable of supporting transmit current drain;
2. Radio trying to send an emergency alarm because the trigger jumper is missing?
by Karl NVW
Tue Apr 17, 2018 1:09 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Motorola 208A/B TNC...
Replies: 5
Views: 288

Re: Motorola 208A/B TNC...

The UDS208 A/B was a 2400 baud synchronous landline modem, not a TNC and not 1200 baud. If you want a 1200b async modem that uses the 1200/2200 tone pair that is used with legacy VHF packet networks you should be looking instead for a model 202S or T. It's still not a TNC!
by Karl NVW
Wed Apr 04, 2018 4:00 pm
Forum: ASTRO25 Series (XTS/XTL 1500/2500/5000) Subscribers
Topic: XTL1500 - do you need red ignition sense cable?
Replies: 11
Views: 923

Re: XTL1500 - do you need red ignition sense cable?

If you want to get 13W delivered to the speaker you have to reduce the load impedance on the amplifier output to half. Ohm's Law, not rocket science.
by Karl NVW
Wed Apr 04, 2018 3:54 pm
Forum: ASTRO25 Series (XTS/XTL 1500/2500/5000) Subscribers
Topic: XTS5000 scan issue
Replies: 4
Views: 604

Re: XTS5000 scan issue

Could be the zone controller's Site Affiliation timer is shutting off the site when there are no radios on that TG registered at that specific site. Normal default is either 6 8 hours, but some sys ops set it a lot shorter to release unused channels in areas where there may be a lot of roamers using...
by Karl NVW
Wed Apr 04, 2018 3:40 pm
Forum: ASTRO25 Series (XTS/XTL 1500/2500/5000) Subscribers
Topic: Temp/Emergency Repeater?
Replies: 3
Views: 622

Re: Temp/Emergency Repeater?

However, those radios CAN be programmed for analog simplex on the interop channels in addition to repeater access for wide-area comms. You'll even find they have standard channel designators ending in the letter "D"
by Karl NVW
Wed Apr 04, 2018 1:30 pm
Forum: ASTRO25 Series (XTS/XTL 1500/2500/5000) Subscribers
Topic: astro spectra plus bootloop, loop, and loop, and loop
Replies: 2
Views: 291

Re: astro spectra plus bootloop, loop, and loop, and loop

Sounds like one of two similar possibilities:
it is either trying to affiliate onto a trunking system, OR
sending an emergency alarm and waiting for the ack.
by Karl NVW
Wed Mar 28, 2018 3:33 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: DIU 3000 ADP ?
Replies: 5
Views: 975

Re: DIU 3000 ADP ?

For MOTOFAN: If your DIU does not already include some form of encryption, follow XMO's instructions posted above. If yours DOES already have an encryption option, but it's not the type you want, you need to buy an upgrade kit for the DIU3000 as a main line item, then add the options for field upgra...
by Karl NVW
Wed Mar 28, 2018 3:22 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: GR1225 sql issue
Replies: 21
Views: 1333

Re: GR1225 sql issue

Speaking from 40+ years of experience, if you want to get rid of the PL noise issue, get rid of that braided shield cable. BOTH the antenna feedline AND the Tx jumper into the duplexer need to be solid shield. 1/4" Superflex makes a great Tx jumper, use something larger for the main line up to ...
by Karl NVW
Wed Mar 28, 2018 12:40 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: 800 Mhz Quantar as base station.
Replies: 6
Views: 356

Re: 800 Mhz Quantar as base station.

800 MHz Quantar was never offered with a control station frequency plan (Tx low), just as a repeater with Tx high.
by Karl NVW
Tue Jan 30, 2018 4:17 pm
Forum: Motorola Digital and Voice Paging
Topic: Minitor Band Change
Replies: 3
Views: 402

Re: Minitor Band Change

Unless you are talking about Minitor 5 or 6 you are out of luck. The entire PC board is built for the specific sub-range, so it could easily be deaf as a fencepost if youtry to move them too far. You may also experience 'birdies' or 'self-quieting' frequencies which will degrade audio quality that w...
by Karl NVW
Tue Jan 30, 2018 3:34 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: VHF Quantar Duplexer 600KHz?
Replies: 7
Views: 511

Re: VHF Quantar Duplexer 600KHz?

I believe the numbers Escomm is looking at are for the preselector filters. TxRx has a very nice six 10" can BPBR design that is specifically built for 600 KHz T-R separation. Bandwidth of each leg (for alternate operation on two channels) is about 67 kHz with slightly degraded performance: add...
by Karl NVW
Tue Jan 30, 2018 2:35 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: Started a project with PSC9600 and some quantars.....Need some help
Replies: 5
Views: 419

Re: Started a project with PSC9600 and some quantars.....Need some help

The controller needs to see a second station on a different RF channel that can serve as the backup control channel if station 1 TX fails or RX1 is hit with hostile receiver interference.
by Karl NVW
Tue Jan 30, 2018 1:49 pm
Forum: Radio Programming
Topic: HT1000 Pre and De emphasis
Replies: 1
Views: 391

Re: HT1000 Pre and De emphasis

Not an option on the portables.
by Karl NVW
Thu Dec 21, 2017 1:29 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Coax recommendation portable UHF base station
Replies: 5
Views: 957

Re: Coax recommendation portable UHF base station

There's nothng worong with using "the good stuff," either Superflex or Heliax. Those connectors don't rely on the cable braid for mechanical strength. I'd suggest just a short pigtail of 1/4" inside the mounting tube with an N connector at the bottom. Then make up an appropriate lengt...
by Karl NVW
Thu Dec 21, 2017 12:37 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Low band CDM - why do you need 3 radios to cover from 30 - 50MHz?
Replies: 23
Views: 2318

Re: Low band CDM - why do you need 3 radios to cover from 30 - 50MHz?

The receive side is easy - you just need an SDR-RSP2 and SDR UNO software and a laptop to run it. Price is about $150 USD. But that ignores the antenna system which needs to provide a nominal 50 ohm impedance to the radio for transmit (RL<15 dB), across the entire 30 to 50 MHz window, and develop le...
by Karl NVW
Thu Dec 21, 2017 12:16 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Maxtrac 144-174 split?
Replies: 5
Views: 773

Re: Maxtrac 144-174 split?

The bandsplits are caused by both the synthesizer programming and RF switch filtering on the PA board. The traditional splits of 146-162 and 162-174 were normal in the USA, and I recall seeing a compromised third version built just for Uncle Sam's 136-150.8 window.
by Karl NVW
Thu Dec 21, 2017 11:53 am
Forum: MotoTRBO Repeaters, Trunking, and Site Infrastructure
Topic: Portable usage in police agencies
Replies: 12
Views: 950

Re: Portable usage in police agencies

FWIW, users get the same so-called "Echo" delay in P25 systems, and for precisely the same reason - delays in the infrastructure transport path. Strange how the laws of physics are so repeatable.
by Karl NVW
Thu Dec 21, 2017 11:48 am
Forum: MotoTRBO Repeaters, Trunking, and Site Infrastructure
Topic: Motorola model P1350AX suitcase style.
Replies: 1
Views: 412

Re: Motorola model P1350AX suitcase style.

It's an ASTRO model, not at all compatible with DMR.
by Karl NVW
Mon Mar 20, 2017 6:53 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Whats the point of buying a 110w radio?
Replies: 71
Views: 10955

Re: Whats the point of buying a 110w radio?

That's why Motorola hires highly trained engineers on their staff to design systems where actual performance of the hardware selected meets the coverage needed to compolete the mission in the customer's working environment. Did it myself the previous 43 years with LMPS / Comm Sector / MSI.
by Karl NVW
Wed May 18, 2016 5:48 pm
Forum: Consoles
Topic: Pre-Recorded Announcements from the MCC7500 console ?
Replies: 7
Views: 3397

Re: Pre-Recorded Announcements from the MCC7500 console ?

If your system is running software release A7.15 or later you can load up to 15 canned audio files and assign them to Alert Tone buttons.
by Karl NVW
Wed May 18, 2016 5:28 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: Anyone familiar with Plant Equipment Vesta Standard phone eq
Replies: 4
Views: 939

Re: Anyone familiar with Plant Equipment Vesta Standard phone eq

My first question is "Why would a Fire District HQ trust their telephone system to a bunch of discontinued equipment bought on E-Bay and being installed by someone who has no idea how to install, program, or maintain it?"
by Karl NVW
Wed May 18, 2016 3:46 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Centracom Gold Elite
Replies: 3
Views: 1290

Re: Centracom Gold Elite

Not with the boards available from Moto Natl Parts Dept today and CDM software.
by Karl NVW
Wed May 18, 2016 1:57 pm
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: Repeater De-Sense
Replies: 14
Views: 2205

Re: Repeater De-Sense

Did anybody run the math for transmitter RF products and harmonics of the 25W FM translator output? FM channels are +/- 100 kHz modulation, therefore the 25W "noise cloud extends from 147.600 to 147.900 MHz, and that assumes the TX never overdeviates on peaks.
by Karl NVW
Tue Oct 06, 2015 4:27 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: MTR2000 simplex TX interfering with RX (TX idle frequency problem?)
Replies: 4
Views: 750

Re: MTR2000 simplex TX interfering with RX (TX idle frequency problem?)

You've got a failed switching control circuit; the exciter is still keyed on the transmit frequency even though the rest of the radio is in receive.
by Karl NVW
Tue Oct 06, 2015 4:22 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: MTR3K and battery revert
Replies: 14
Views: 968

Re: MTR3K and battery revert

He was not planning to use the AC supply, instead running them totally on battery.
by Karl NVW
Tue Oct 06, 2015 4:19 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: Spectra Tac
Replies: 4
Views: 887

Re: Spectra Tac

Instructions for adding a second 8-port chassis are in the basic DigiTAC manual. Beyond two gets rather complicated unless you have the full set of manuals and know what you are doing.
by Karl NVW
Fri Jan 31, 2014 1:16 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: MCC7500 Manual
Replies: 9
Views: 1739

Re: MCC7500 Manual

Your system owner doesn't allow DRG by users, so no need to trouble yourself.
by Karl NVW
Sat May 19, 2012 8:19 am
Forum: Motorola Digital Radio Compatability
Topic: Motorcycle Mobile Radio
Replies: 5
Views: 971

Re: Motorcycle Mobile Radio

Digital without P25 trunking is called conventional digital, aka CAI if the units are P25 compatible. Works fine, lasts a long time, your choice of manufacturer and modulation. Just don't expect any interoperability between suppliers.
by Karl NVW
Sat May 19, 2012 7:59 am
Forum: Base Stations, Repeaters, General Infrastructure
Topic: MSF 5000 Wireline 2175Hz Notch Filters - Trunked vs. Conv.
Replies: 6
Views: 385

Re: MSF 5000 Wireline 2175Hz Notch Filters - Trunked vs. Con

There is a very simple reason that you can't fix this by moving jumpers in the station: When running in conventional mode the magic you desire takes place in the DigiTAC voting comparator chassis, not the station! Simply put, the console is NOT connected in parallel with the voter output. The option...
by Karl NVW
Tue Feb 02, 2010 6:59 pm
Forum: Motorola Digital and Voice Paging
Topic: Future Paging Solutions
Replies: 6
Views: 413

Re: Future Paging Solutions

There's still the original 'from day one' FCC prohibition against paging on all 800 MHz channels, which includes public safety. Plus most console manufacturers know you can't send paging tones across a P25 digital trunking channel because the IMBE vocoder can't handle them. But don't let the FCC rul...
by Karl NVW
Tue Feb 02, 2010 5:31 pm
Forum: Legacy Batboard Motorola ASTRO (VSELP/IMBE/AMBE) Equipment Forum
Topic: APX6000
Replies: 19
Views: 1472

Re: APX6000

For what it's worth, if the P25 Phase 2 channel data rate had remained at 9600 baud (instead of changing the data rate to 12 kb as voted by Tyco and EADS), the XTS/XTL series WOULD have been flash-upgradeable to Phase 2.
by Karl NVW
Tue Dec 25, 2007 6:52 pm
Forum: Legacy Batboard Motorola ASTRO (VSELP/IMBE/AMBE) Equipment Forum
Topic: Astro Saber/XTS3000 CPS R05.02.01 released
Replies: 13
Views: 1446

Re: Astro Saber/XTS3000 CPS R05.02.01 released

LAKE EFFFECT - You need to get a better news source for State of Michigan. That particular network has been running ASTRO 6.x for several years, 6.5 since week after Labor Day 2006. The article in question is referring to ASTRO flashcode versions 5.1 and 5.2 which are very current. Flashcode version...
by Karl NVW
Fri Oct 05, 2007 12:47 pm
Forum: Radio Programming
Topic: Using the Search feature
Replies: 17
Views: 42577

Re: Using the Search feature

OK, users should always remember that "If you're not part of the solution you're part of the problem." Since I agree that the current limits make the search unuseable for any popular item, here's one suggested fix: Limit search to last N days, user to specify N not to exceed 15,?, 20?, but...
by Karl NVW
Fri Sep 22, 2006 1:01 pm
Forum: Legacy Batboard Motorola ASTRO (VSELP/IMBE/AMBE) Equipment Forum
Topic: MT 1500 APCO 25 UPGRADE???
Replies: 31
Views: 2576

MT1500 on 700 MHz?

Remember that 700 MHz is digital only for primary systems. The FCC says an analog-only radio is not allowed in that band, except on the low-power 2W channels. (90.535a)
by Karl NVW
Mon Jun 26, 2006 9:37 am
Forum: General Motorola Solutions & Legacy Radio Discussion
Topic: info on antenna 900 mhz
Replies: 5
Views: 445

Re TDF6284

Celwave PD1110 9 dB gain
by Karl NVW
Tue May 23, 2006 1:04 pm
Forum: Motorola Digital and Voice Paging
Topic: Minitor V
Replies: 11
Views: 1312

Reading right out of the Minitor V price pages, bandsplits in UHF are:

406.0 to 430.8, 450.0 to 493.9975, and 504.0 to 512.8

Looks like the Minitor V is good to go; call your dealer.
by Karl NVW
Tue Feb 14, 2006 1:03 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: Quantar ASTRO Woes?
Replies: 23
Views: 2425

Sorry, XMO, I didn't mean to mis-quote you. A T1 circuit is definitely not required for the ASTRO modem. The part I intended to clarify was at the very end where you said: "They would use Astro modems for the digital traffic and those work with the same kind of analog line as the standard Spectra-Ta...
by Karl NVW
Mon Feb 13, 2006 11:32 am
Forum: Base Stations, Repeaters, General Infrastructure
Topic: Quantar ASTRO Woes?
Replies: 23
Views: 2425

One correction to XMO's Sunday 12:46 comment that you would use the same analog phone lines for ASTRO voting: NOT TRUE!! The lines MUST be capable of full duplex operation for the ASTRO modems to work at all. Most analog Rx-only sites were configured to get reciver audio inbound to the voter, but wi...
by Karl NVW
Wed Dec 07, 2005 2:13 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: Smartzone 3.0 time server
Replies: 3
Views: 432

Time connection on 3.0 Z release

You cannot input time to the CEB with the RS232 line like you did with old Button & LED or Classic CRT. The "WWV BIM" has not been supported in Centracom software for over two years, nor are the B&L and Classic Op positions. Elite OPs running on WinXP clients get their time from the ADM/CDM ...

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