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Search found 44 matches

by JRayfield
Fri Apr 27, 2018 5:56 am
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR COM-120B Real Time Clock Failure
Replies: 3
Views: 256

Re: IFR COM-120B Real Time Clock Failure

Can someone tell me how this is programmed?

John
by JRayfield
Thu Apr 26, 2018 3:46 pm
Forum: Test Equipment & RF Equipment Alignment
Topic: IFR COM-120B Real Time Clock Failure
Replies: 3
Views: 256

IFR COM-120B Real Time Clock Failure

I've got a COM-120B in which the battery in the Real Time Clock (RTC) apparently went dead. I replaced the RTC module (got several from China) but the Self Test still shows the RTC failure. Of course, it's possible that the RTC modules that I from China are defective. Or it's possible that I damaged...
by JRayfield
Thu Apr 05, 2018 6:08 am
Forum: Test Equipment & RF Equipment Alignment
Topic: Aeroflex (IFR) Questions
Replies: 587
Views: 45349

Re: Aeroflex (IFR) Questions

I have a Com120B which has lost the battery in the Real Time Clock. Getting that repaired won't be a big problem, but getting the options working again are a problem, as I never had the codes for those options. I've seen that some people have come up with these option codes and so was wondering if a...
by JRayfield
Wed Apr 29, 2015 4:41 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: Moto Trbo System Comparasons
Replies: 21
Views: 2059

Re: Moto Trbo System Comparasons

That's a shame. When MOTOTRBO systems don't work well, then people start thinking (and talking about) that the technology is 'bad'. And that is SO far from the truth. MOTOTRBO is fantastic, if it's implemented properly. John Rayfield, Jr. Well, that pretty much sums up how it was done. IT was a new ...
by JRayfield
Wed Apr 29, 2015 3:28 am
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: Moto Trbo System Comparasons
Replies: 21
Views: 2059

Re: Moto Trbo System Comparasons

The frequency coordinators were limiting the power output of MOTOTRBO repeaters, on VHF public safety frequencies, to 10 watts, for a while (This wasn't done for more than about 1 year, at most). But that was several years ago and they are now coordinating them at higher power levels again (and have...
by JRayfield
Wed Apr 29, 2015 2:58 am
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: Moto Trbo System Comparasons
Replies: 21
Views: 2059

Re: Moto Trbo System Comparasons

The specifics vary, depending upon whether it's IP Site Connect (IPSC) or Linked Capacity Plus (LCP) or Connect Plus (Cap+). I'm mostly familiar with IPSC and LCP. On IPSC systems, the repeaters transmit a beacon every 'x' seconds (programmable in the repeater). This beacon is used by the mobile/por...
by JRayfield
Sun Apr 26, 2015 8:10 am
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: XPR4550 Remote Kit
Replies: 2
Views: 739

Re: XPR4550 Remote Kit

The Remote Kit does not use the accessory connector on the radio (the 'brick', as you call it). So, a remote mike can be connected to the accessory connector and the control head can still be connected. We've done this in ambulances, where they needed a remote microphone and speaker in the back of t...
by JRayfield
Fri Mar 20, 2015 9:33 am
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: Moto Trbo System Comparasons
Replies: 21
Views: 2059

Re: Moto Trbo System Comparasons

I've had about 16 years of experience in using internet for connecting between repeater sites (built one of the first IP-connected repeater networks in the U.S. in 1999). Currently, we're using internet connections for our Linked Capacity Plus system throughout S.W. Missouri. Reliability of using th...
by JRayfield
Thu Mar 19, 2015 4:33 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: Moto Trbo System Comparasons
Replies: 21
Views: 2059

Re: Moto Trbo System Comparasons

Not only can you set up one repeater with Capacity Plus as a "2 channel trunking system", but the FCC will license it as a trunking system (YG), since there are two 'voice paths' being trunked. This also then means that you can get an FB8 (protected) frequency for a single repeater (assumi...
by JRayfield
Fri Oct 31, 2014 4:50 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: Audio problem of XPR6550
Replies: 13
Views: 1325

Re: Audio problem of XPR6550

Wavetar is 100% correct. Two XPR radios are not supposed to be able to 'talk to each other', through a repeater, if they are programmed with the same Radio ID. This is 'by design' and can not be 'turned off'. But, since you're finding that you can talk between the radios, when they're all programmed...
by JRayfield
Fri Oct 31, 2014 4:41 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: Unusual sound from TRBO system
Replies: 3
Views: 615

Re: Unusual sound from TRBO system

Idle messages. For roaming between repeaters in an IP Site Connect system.

John Rayfield, Jr.
Rayfield Communications
by JRayfield
Fri Oct 31, 2014 4:39 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: Beacon Issue
Replies: 7
Views: 869

Re: Beacon Issue

What version of firmware?

John Rayfield, Jr.
Rayfield Communications
by JRayfield
Sun Oct 26, 2014 6:25 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: Audio problem of XPR6550
Replies: 13
Views: 1325

Re: Audio problem of XPR6550

If both radios have the same Radio ID, then they won't talk to each other. The Talkgroup ID's obviously have to be the same.

John Rayfield, Jr. CETma
W0PM
by JRayfield
Fri Apr 04, 2014 3:03 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: CET exam
Replies: 2
Views: 431

Re: CET exam

I used a study guide from CEI (Cleveland Institute of Electronics). It was concise, unlike some study guides that have a lot of 'fluff' in them.

John Rayfield, Jr. CETma
W0PM
by JRayfield
Wed Nov 20, 2013 2:08 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: Trbo voting?
Replies: 11
Views: 1347

Re: Trbo voting?

Digital Voting for MOTOTRBO (conventional, IPSC, Cap+, and LCP) will be available soon.

John Rayfield, Jr.
W0PM
by JRayfield
Fri Aug 09, 2013 6:05 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: Turbo Question
Replies: 13
Views: 957

Re: Turbo Question

"Radio Check" works on Conventional, IP Site Connect, Capacity Plus, and Linked Capacity Plus systems.

John
by JRayfield
Wed Jun 13, 2012 10:44 am
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: XPR6550 "Q" split vs "T" split for ham use?
Replies: 6
Views: 474

Re: XPR6550 "Q" split vs "T" split for ham use?

What's been hacked? The firmware? The Codeplug? If either one of those has been hacked (modified), then what happens when you want to update the radio with new firmware (which you will want/need to do, at some point in time)?

John Rayfield, Jr. CETma
W0PM
by JRayfield
Mon Jun 11, 2012 5:10 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: New MOTOTRBO portables. XPR-3300 and XPR-3500
Replies: 13
Views: 901

Re: New MOTOTRBO portables. XPR-3000 and XPR-3300

Very cool! My father and I were saying, just a few weeks ago, that we needed a version of the XPR6100 that could do Capacity Plus trunking (simple, no gps, limited channels/talkgroups, but single-site trunked).

John Rayfield, Jr. CETma
W0PM
by JRayfield
Thu Apr 26, 2012 5:54 pm
Forum: Motorola Digital Radio Compatability
Topic: Yaesu FT1D (OT)
Replies: 7
Views: 1030

Re: Yaesu FT1D (OT)

DMR is 'time-slotted'. It is TDMA. That is the DMR standard. So if a radio isn't TDMA and it isn't 'time-slotted', then it isn't DMR and is not compatible with MOTOTRBO (other than in analog mode).

John Rayfield, Jr. CETma
by JRayfield
Mon Apr 09, 2012 6:53 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: mobile as a repeater
Replies: 4
Views: 530

Re: mobile as a repeater

It can be done and will work, but every time you convert from digital to analog or vice versa, there's a loss of 'fidelity'. So, going from digital, to analog (the accessory connector of the first radio), connected to analog (the accessory connector of the second radio), and back to digital, you're ...
by JRayfield
Sat Mar 03, 2012 4:51 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: MotoTrbo Simplex Coverage - Analog is better
Replies: 16
Views: 1209

Re: MotoTrbo Simplex Coverage - Analog is better

Make sure that your MOTOTRBO radios all have the latest version firmware. John Rayfield, Jr. CETma Rayfield Communications We've been testing MotoTrbo for several months now. We are seeing much better repeater coverage than our analog system using mobiles and portables. Our analog system is still wi...
by JRayfield
Sat Mar 03, 2012 4:47 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: New Thin Trbo Prep
Replies: 42
Views: 2660

Re: New Thin Trbo Prep

We receive our demo kit the day before yesterday. I haven't had much time to play around with them yet, but so far, I'm impressed. As to the cost, yes, they're not 'cheap'. But, we have hotels where we've sold EX500's, because the management (the 'suits') didn't want to carry a larger portable (even...
by JRayfield
Sat Jan 21, 2012 7:37 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: CPS 6.0 Install Error
Replies: 3
Views: 377

Re: CPS 6.0 Install Error

Version 6.0 of the MOTOTRBO CPS is VERY VERY old. If you just received that, directly from Motorola, then someone really 'goofed' when they shipped that CD.

John Rayfield, Jr. CETma
by JRayfield
Sun Nov 13, 2011 7:11 am
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: XPR8300 Fan Speed - again
Replies: 14
Views: 756

Re: XPR8300 Fan Speed - again

I agree that this can make a person a bit 'nervous' about selling the XPR8300 or XPR8400 into a system that runs at or near 100% duty cycle. My personal feeling is that they've got the problem resolved. Along with the higher/full-time fan speed, they made some other changes that result in better hea...
by JRayfield
Sat Nov 12, 2011 4:08 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: XPR8300 Fan Speed - again
Replies: 14
Views: 756

Re: XPR8300 Fan Speed - again

I wouldn't say that it's 'safe to say' anything, if you don't know 100% for sure. By the way, I am a member of the MOTOTRBO Application Developer's Program. And that does give me a lot of detailed information about MOTOTRBO as well as access to engineers, to which dealers don't have access. John Ray...
by JRayfield
Fri Nov 11, 2011 7:01 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: XPR8300 Fan Speed - again
Replies: 14
Views: 756

Re: XPR8300 Fan Speed - again

If you called up the 800 number and spoke with someone on the phone about this problem, then you would not have spoken with any of the engineers with whom I've discussed this. The engineers that I know, are the ones that design and test the equipment. They don't answer the phones. But, your experien...
by JRayfield
Sun Nov 06, 2011 7:10 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: XPR8300 Fan Speed - again
Replies: 14
Views: 756

Re: XPR8300 Fan Speed - again

Actually, the XPR8300 was very much tested and proven to run 100% continuous duty. I personally know one of the engineers that was involved in this testing and what they did to that model should have quickly destroyed it, but it didn't. That's why it was released - it passed 100% duty cycle tests wi...
by JRayfield
Sun Oct 30, 2011 2:00 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: Community Repeater + Digital
Replies: 8
Views: 706

Re: Community Repeater + Digital

I've successfully used an XPR8300 repeater on LTR. John Rayfield, Jr. CETma I don't know if it was just us, but I was never able to successfully intergrate a community panel on one of our test XPR 8400 repeaters. One of the reasons we dumped them. Using PL was OK, but it couldn't handle DPL or LTR c...
by JRayfield
Sun Oct 30, 2011 1:58 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: Vertex & IP Site Connect; Telephone Interconnect
Replies: 17
Views: 827

Re: Vertex & IP Site Connect; Telephone Interconnect

There were problems with early XPR8300 repeaters, with final amp failures. These problems have been corrected in newer 8300's and in the XPR8400. I have numerous 8300 repeaters, that have not exhibited this problem and some have run almost 8 hours a day with almost 100% continous transmit. John Rayf...
by JRayfield
Wed Oct 12, 2011 3:02 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: MOTOTRBO Firmware audio quality
Replies: 8
Views: 825

Re: MOTOTRBO Firmware audio quality

Is AGC enabled in digital mode on all of your radios?

John Rayfield, Jr. CETma
by JRayfield
Sun Aug 14, 2011 8:19 am
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: MotoTrbo Simplex Coverage - Analog is better
Replies: 16
Views: 1209

Re: MotoTrbo Simplex Coverage - Analog is better

MOTOTRBO should be providing better coverage than analog in any situation, simplex or repeater operation. In tests in our area, MOTOTRBO clearly outperformed wide-band analog FM in simplex tests. What version of firmware in the radios and repeaters? That can have a bearing on how the equipment perfo...
by JRayfield
Fri Aug 12, 2011 4:54 am
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: mototrbo digital
Replies: 23
Views: 1523

Re: mototrbo digital

I'm not sure where you go your 'graph' from, because the one that I have from Motorola clearly shows better performance of MOTOTRBO over analog FM. I would very much be interested in seeing this graph that you speak of. John Rayfield, Jr. CETma W0PM http://www.rayfield.net Mototrbo brochures has a c...
by JRayfield
Thu Aug 11, 2011 4:16 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: mototrbo digital
Replies: 23
Views: 1523

Re: mototrbo digital

Your statement "In general more complex modulation would requires higher SNR at the input to the decoder section of the receiver to produce the same BER" is interesting. Maybe MOTOTRBO hardware and firmware works better than "In general". Unless you work for Motorola, in engineer...
by JRayfield
Sat Aug 06, 2011 8:17 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: mototrbo digital
Replies: 23
Views: 1523

Re: mototrbo digital

This is not true with MOTOTRBO. MOTOTRBO systems consistently provide more range as compared to analog fm, especially narrowband analog fm. This has been proven in 'live' systems, and I've discussed this with numerous engineers at Motorola and they all agree that MOTOTRBO will usually provide better...
by JRayfield
Sat Jul 16, 2011 7:37 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: Master site Static IP - alternative solutions
Replies: 8
Views: 685

Re: Master site Static IP - alternative solutions

Nice idea, Alex. I've used the UT-3300, from Datacom-for-Business (dcbnet.net), for setting up simple, solid, and fast VPN connections. They should work well for this application, and they'll support Dynamic DNS. Use this with a service like DynDNS (dyndns.com) and you've got a nice, easy-to-setup, ...
by JRayfield
Sat Feb 19, 2011 8:19 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: Remote control of MOTOTRBO repeater running digital
Replies: 3
Views: 434

Re: Remote control of MOTOTRBO repeater running digital

TRBOnet doesn't provide remote control of a repeater, only a control station (XPR-series mobile). I believe Avnet may have the capability of interfacing their Scout IP-based console system into a TRBO repeater, at the IP level (IPSC mode). But, for a simple remote, that's probably way overkill (and ...
by JRayfield
Fri Feb 18, 2011 9:18 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: Remote control of MOTOTRBO repeater running digital
Replies: 3
Views: 434

Re: Remote control of MOTOTRBO repeater running digital

You're correct. In the digital mode, the XPR8300 doesn't do anything but 'repeat' what it receives. There is no analog-to-digital interface in the repeater that can be accessed from the accessory port. So the only way to get remote control of the repeater is to do it over a network connection (with ...
by JRayfield
Fri Feb 18, 2011 9:15 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: XPR8300 Analog Channels
Replies: 6
Views: 428

Re: XPR8300 Analog Channels

I interfaced a TL-Net LTR repeater controller, from Bridgecom Systems, to an XPR8300 and it worked fine (in LTR mode).

John Rayfield, Jr. CETma
www.rayfield.net
by JRayfield
Wed Dec 15, 2010 7:22 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: PTT ID possible on Trbo?
Replies: 12
Views: 1133

Re: PTT ID possible on Trbo?

I've got that 'helicopter audio' on my website, as well as some other audio files of background audio tests that we've done with TRBO.

http://rayfield.net/MotoTRBO-Sound-Tests

John Rayfield, Jr. - CETma
by JRayfield
Fri Nov 26, 2010 9:02 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: XPR6550 Audio issue
Replies: 6
Views: 541

Re: XPR6550 Audio issue

Is the unit decoding the tones correctly?

John Rayfield, Jr. - CETma
www.rayfield.net
by JRayfield
Sun Nov 21, 2010 9:44 am
Forum: Base Stations, Repeaters, General Infrastructure
Topic: Mototrbo
Replies: 11
Views: 678

Re: Mototrbo

Some federal grants can be used for non-P25 equipment/systems. It depends upon the type/source of the grant and the 'rules' that the state has in place (the federal government leaves some of the 'details' up to the individual states, as to what some grants can be used for). A nearby county received ...
by JRayfield
Wed Jan 21, 2009 9:00 pm
Forum: MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers
Topic: TRBO CPS Region Issue
Replies: 5
Views: 527

Re: TRBO CPS Region Issue

I think the region information is programmed into the units at the factory, using software that is pretty much kept under 'lock and key'. There is nowhere in the CPS software to change the region info in a radio. I believe that doing so might allow radios that aren't type certified in a country to b...
by JRayfield
Tue Jan 20, 2009 9:47 pm
Forum: Base Stations, Repeaters, General Infrastructure
Topic: MTR2k+GR500+Digitac CONFIG
Replies: 8
Views: 399

Re: MTR2k+GR500+Digitac CONFIG

I just joined this site and noticed this thread. Here's a bit of information that I came by recently.... If you're in the U.S., you can't legally run continuous carrier operation (continuous transmit) on 'shared' frequencies - only on 'exclusive' frequencies, or on frequencies that are specifically ...

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