Batboard

I think this whole thread may very well be an XY Problem: http://www.perlmonks.org/?node=XY+Problem I really don't understand how listening to the random garbles of a vocoder being fed invalid data is going to help you. I think you have some other problem you are trying to solve ("X"), and...

That's not a memory problem per se. The "environment" is a section of memory reserved for storing "environment variables", like the set of directories to look for executables in (the PATH variable). When a program is started, a fixed size buffer is allocated to store the environm...

There are no guaranteed mappings from calibration values to watts - that's the whole point of a calibration value; it varies from radio to radio. If you turn the calibration value all the way up, you WILL be overdriving your transmitter - causing distortion, widening the spectrum to interfere with o...

Can you feed 10MHz into the external ref port, to eliminate the TCXO as a possible culprit?

Most modern power supplies are high frequency switching power supplies. The first thing such supplies do with the incoming AC is rectify it and turn it into high voltage DC, usually 170 or 300 VDC. They then switch that DC at very high frequencies (usually 1MHz or greater) to drive a very small tran...

I absolutely understand that I need to read the spectrum analyzer from the site -- and we will be doing that in a few hours. But from my home where I am now the SA is showing me that with a 1MHz spread I just have a noise floor (that could be lower.) But if I switch to 1356MHz spread to include the...

http://www.kansas.com/2014/03/30/337588 ... inate.html
http://www.kansas.com/2014/03/30/337588 ... orola.html

Most radio software is written for Windows. You *might* be able to run the software under Wine, which provides the Windows APIs under Linux, but it's hit or miss (I've had some luck with Motorola's newer software doing this). The first thing I'd ask is why are you wanting to use a Linux computer for...

My next guess is that your computer is too fast for the program. The program is likely trying to calibrate a hardware delay loop, by measuring how long it takes to perform a reference operation, then dividing by that time to set the number of times to loop to delay an operation. If your computer is ...

Do you have a real RS-232 port, or only a USB to Serial cable? Emulation software cannot make software designed to do bit twiddling on a 16550 work on a USB port, and your programmer software may be waiting for a hardware interrupt that will never happen because you don't have a real UART.

I know we had done some work in the GRM to support the 386sx processor, but I don't know if that work made it back to the commercial version. Also, trading a 376 for the 386sx is like trading a red unicorn for a white unicorn - more common relative the original, but still damn rare. I know we had to...

Try turning off Javascript. A Win98 machine is probably not very powerful by today's standards, and many web sites (especially sites that use discussion forum software) have a distressing tendency to push a ton of Javascript crap out to the client, burning a tremendous amount of CPU for little benef...

Usually, the marking are
NNM
where NN is numerical value, and M is the multiplier of that value, giving a value of NN*10^M

In this case, 85*10^1 = 850.

Were it 852 then the value would be 85*10^2 = 8500 ohms.

Well, I'd hope nobody just gives you "a file" of the firmware, as that is a copyrighted work. You can contact Aeroflex Service and see if the firmware is up to date (I'll ask around at work tomorrow and see what I can find out, but the most assured way to find out would be talk to service)...

Will wrote:Kato check with Wowbagger in the Test equipment Forum.

I would just say what I always say: contact Aeroflex Service. In matters like this that's really all I can say- I am not going to antagonize a profit center of my employer.

Any key will do. About our COM-120, after further testing, unit is unresponsive to any keypress. Anything we could check ourselves? Or do we need to send it in? So, the screen is up, but it the stops responding to keys? It may be a bad connection on to CPU; my unit does this sometimes. Unseat the C...

http://www.hellroaring.com/bic75150.php

FET based, 0.01 ohm or less on resistance, switches on automatically on Vin>13.0VDC, can be manually enabled or disabled.

You are correct about what component is the memory card. It contains the application. The fact the system boots at all indicates the firmware is OK. The card is corrupt - the section that contains the program for the display is valid, but the section that contains the main analyzer program has been ...

The system is not finding the actual main application. Check the flash memory card on the main CPU board - see if it has come loose. If reseating the card does resolve the problem, then the card has become corrupted. Contact Service and get them to send you another card.

I agree he was a jerk in his initial response. However, given that he was a jerk, in my opinion you should have taken your own advice and not engaged him further - just ignore his response and await a helpful response. By responding you just provoked him further, and allowed him more chances to get ...

Any key will do.

Don't worry about it - my personal unit's been doing it for some time.

The calibration data is very important, so it stored in 2 places: the main CPU's nonvolatile RAM, and the EEPROM on the front panel's microcontroller. Each copy is checksummed. At start up, the system evaluates the checksum on both copies. If one copy has a bad checksum and the other a good checksum...

Co6aka wrote: Also, what are the differences in the 2945, 2945A, and 2945B? Were they re-designs due to parts availability issues, or...? And, what' are the differences in the 2947/A and 2948/A/B variants?

I came up with nothing - I'd suggest asking Service.

I have a ifr 3902 and I have several dstar repeater systems and radio. At one time I read that icom and aeroflex was going to come out with a option for the icom dstar systems, anyone know when and how much? The D*star stuff is basically a set of canned waveforms IIRC - it doesn't do dynamic simula...

Internally, several of us in different departments have been trying to get the company to put up an official forum, with people who'd job it is to answer questions (as opposed to here, where I am doing this in my spare time with zero authorization). If you like the sounds of that, I'd suggest you co...

The 294X family was designed by what was the old Marconi Instruments group in the UK, so I'll have to ask over there. Software upgrade and purchasing of options and manuals should be handled though Service, just like anything else - I know they can handle that line. As for the differences... I can a...

Thanks - I couldn't remember if it was ESC or what - the only way I run Windows is in a VM....

Try hitting ESC during the boot. The system thinks it was suspended, but likely the file the system state was written to is corrupt (the system probably tried to save to the file, and didn't even have enough battery to do that). If you can get Windows to give you the option of ignoring the file, you...

On the save issue, I'll see if it's a known bug. Could you get me the version # of the unit's software?

As for the handle info - I'll have to say "contact Service".

The civilian versions don't have a file system to speak of. Where that backup would go I have no idea - IBd have to ask Bonnie when I get back to work.

I'm on vacation the next 2 weeks, so I cannot ask around, but if I remember correctly, Pasternak has them.

If you get a line on any, I'd like to know - I have a System 500 as well.

The first thing I'd check out would be to put some cleaner through the pots and switches - plastic safe, of course - followed by some tuner lube. My unit was a bit "scritchy" before I did so.

Yes, to do voting on a digital system you need to be looking at the parametrics of the bitstream, not the parametrics of the voice - you'd need information from the actual Trbo receiver.

Silly question - do they have batteries in them? The batteries may have gone flat, and are preventing the power supply from coming up.

Is there a quick way I can plunk rough cal numbers in the CAL ram to get me by? I don't have all of the gear that is called for in the service manual but I can find a source of RF power and I have a calibrated Bird thoughline wattmeter. You can just run through the cal procedure for the power meter...

There's not going to be DMR for the 2945. DMR would be the 3900 family.

As for the rest of your uses - the 2945 should do pretty well. That used to be a Marconi Instruments device before IFR bought them, and was Marconi's competition for the COM-120B, so I am a bit biased.

Guys: I cannot change the policy. Dumping all the grief on me does nothing to change the policy. It does EVERYTHING in making me reconsider trying to help you in the ways I can. I've told you who could change the policy, and what you can do about it. Now, either write Paul and Rob, or don't. Either ...

It would just be nice to be able to still get some minimal support or even second hand/refurb parts from the manufacturer for a product that is less than 10-15 years old, rather than a note that they threw out/crushed everything. I rest my case. OK, get your 5 year old cell phone repaired. Or your ...

By NVRAM does she mean the Dallas DS1287 or the Memory card that has the DS1260 SmartBattery on it? The memory card. And as for replacing that battery without losing the contents - Short of some very careful soldering work, and temporarily putting a battery elsewhere, I don't have a good suggestion...

I understand your feelings, but do keep in mind, it's not like we take sand in the back door and equipment comes out the front - we buy our parts from other companies, who then discontinue those parts when the choose. We then have the choice of either tying a large amount of money up in a last time ...

I checked with the lead engineer on the 1600, and she says the options are stored in the NVRAM as well.

We were considering purchasing 3920's to replace our R2670's, but after hearing about support/parts, I'll fight that tooth and nail. We are taking a good long look at the GD R8000... We can still get parts for our R2600's and R2670's without issue. It's unfortunate that Aeroflex considers keeping p...

The battery on the card backs up current state. I'm not sure about where the options are stored - if they are in the NVRAM card or in the real time clock, but I can ask Bonnie when I get in to work. As for backing up and restoring... I don't think there's any way a normal user can do that, as that w...

So.. wasn't the IFR 1900 a current product until 2006 for $75,950? Aeroflex stops selling parts for it 6 years later! scrapping all the parts and docs? It's more "Keeps the spares for the military contracts, which have big time penalties for not maintaining spares for a very long time, vs. ser...

Normally, the lines are about 50 ohms, so I'd try that.

What frequency band and service are you planning on using? Business band? IIRC FRS does not allow encryption.

http://en.wikipedia.org/wiki/Resistor_ladder Basically, make 3 instances of a 2 stage R-2R ladder, one for red, green, and blue. You could likely take a DB9 and a DE15 (what some people call a DB15, which is not correct), and make a simple converter in that. It won't be pretty, but it would be enoug...

You can make a poor man's converter from EGA to VGA - all EGA does is output 6 bit video - 2 bits R, 2 bits B, 2 bits G - you can make a simple resistor network to turn that into analog, and feed a VGA monitor (as long as it can sync to the EGA scan rates). As for the video card: Service may have re...

Well, that looks like the video card is going south more than it looks like the monitor is going south. I agree that the best check is to hook up to the video output with an external monitor, but the spacing of the lines, the way the background sort-of repeats in them, etc, makes me think the video ...

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