Batboard

Bill_G

The VCO coil is on the RF brd under a cover that can be pried with a screwdriver.

Bill_G

I'm awful curious how the deployment of a receive only voting system introduces delay into the transmit By the latency in the slowest link, which is always the ethernet. If the customer uses all T1/DS0, you can use the rough calculation of 6uS per mile to determine the latency. But, if they use eth...

Bill_G

What I need to do is find out if they are co-located repeaters and if they are set at the same power levels, same antenna, etc. It might be fun on a quiet late night or weekend to see how analog vs digital compares for range. Thinking about this, I recall I've already done this experiment (as you d...

Bill_G

It would be an interesting experiment Jim, but difficult to perform because of the number of variables. That's why DAQ tests are a subjective mess. I've never built a perfect system. Invariably, someone had a problem. How important the problem was depended on the people paying the bills, and/or how ...

Bill_G

escomm wrote: disagree, on narrow modulations frequency accuracy is substantially more important than wideband, especially when data is involved

But only at the margins of performance.

Bill_G

Incidently that is only about 80Hz away from right on frequency and it usually does not get much better.. Your decimal point is off, it's 800Hz. And even at 800hz, Memo's radio should still be working. He needs to explain the problem he's having that he thinks is related to being slightly off freq.

Bill_G

Was there a period of time when the new antennas and line were in place, but you had not migrated them to CPlus yet, that it all worked the way it was supposed to?

Bill_G

Haven't we talked about this system before? So, you changed the LMR400 for half inch heliax. Did you reuse the same antennas? Did you sweep the new cables, and did you get greater than 20db return loss? Any other changes to the system like new splitters, and relocate / re-aim the antennas? I'll ask ...

Bill_G

Agreed. It's a "birdie" of some kind occurring at the IF level. You won't see it at the carrier freq on a service monitor. It will be at a lower freq. Almost every piece of electronic equipment built emits a birdie, though not necessarily where you think it should be. Case and Point - a lo...

Bill_G

+1 on not recommending the upgrade. The MTR2K is a fine machine, and you won't gain any benefit from upgrading. If you want to go digital, then buy a new radio, or wait for the MTR3K's to come on the market as they age out. So far, they are turning out to be good radios too.

Bill_G

Did you just program them with 15.5 Trbo CPS? There's a known bug in the latest version that causes super loud volume. Read the radio, open general settings, and then go to minimum volume. Toggle it up and down from mute to something and then back to mute. Then blow it back in. Should fix the problem.

Bill_G

If they are operating analog, then he has a prayer of getting a remote of some kind to interface with the SLR series. But, if they are going to operate in digital, then the accessory port becomes unusable, and no remotes work. PS - any remote adapter will work. You just have to figure out the wiring...

Bill_G

Sounds correct. It's possible your wireline card is bad then. You can try using the WB (wideband) input.

Bill_G

I'm running into the same issue except i'm only using the internal controllers on repeat. sounds fine in the alignment screen. i'm running back to back between 2 quantars for simulcast over a E&M circuit. when a radio keys up the repeater keys and just hear dead air on the other repeater. Wirel...

Bill_G

An Anritsu or equivalent would tell you if it's an antenna problem. Could be cochannel interference. Listen to the channel in analog while another radio reports out of range.

Bill_G

It's a five site VHF IPSC with two of the sites nearly deaf from local desense on the order of 20db or more. Just curious, is it colo'd with AT&T? I tried to run a 2 meter repeater on an AT&T colo site once and the noise floor was so bad I eventually had to take it down. I think there was a...

Bill_G

Thanks FB. Unfortunately, they cannot escape the noise causing the chatter because it's across the band. It's a five site VHF IPSC with two of the sites nearly deaf from local desense on the order of 20db or more. I raised the programmed threashold to -80, or something redunkulas, forcing the statio...

Bill_G

... and getting the cage off is a joy!

Bill_G

You're welcome. Sometimes those caps eat the landings and traces, and then migrate through the feedthroughs to the other side of the board slowly eating that side. All kinds of happiness occurs, and the guy doing the work has to inspect with a magnifying glass to find it all. Scrub scrub scrub with ...

Bill_G

Good point Bob. That same pot area seems to attract the corrosive leakage from the caps. The feedthroughs and resistors are often damaged there. I'm also betting there are damaged feedthroughs and landings on the command board causing the audio problems. The cap rework needs to be thorough.

Bill_G

Ritron makes reasonable quality products at a low price point. I have worked with a lot of their other products, but not the Liberty repeater. I would go in expecting a no frills, limited duty cycle radio, and low current drain.

Bill_G

http://www.repeater-builder.com/motorol ... -caps.html

Here's a whole article about recapping Spectras, what to look for, what to buy, and how to do it.

Bill_G

I just bought a scanner that does v.kitchensink protocols.... Shiowing your age Bill, these days it would be #kitchensink ... blurp errr bleep shhhhhh For those too young to remember or for a nostalgia hit visit: https://www.dialupsound.com/ With the sound on :) (chuckle) I stand corrected. Thanks!...

Bill_G

Yes, there are MDC1200 decoder apps for SDR's. A quick Google search for "decode MDC1200" will yield tons of hits.

Bill_G

I just bought a scanner that does v.kitchensink protocols. No screwing around.

Bill_G

You can check the ULS to see if those freqs are still active.

Bill_G

New Jersey Transit has the 218.0-218.5mhz block A license WQZH741. No one has the 217 blocks yet. Just a handful of freq specific users.

Bill_G

The 600 ohm lo-Z line card should be able to drive a hi-z input. What kind of problem are you having?

Bill_G

Yes, there is alternative product from the same manufacturers that utilize wifi, 900, or deeper into 216 away from 217.

Bill_G

I'm not going to get very specific because I think this is the cusp of a bigger problem, and big players are involved. There are a number of patient monitoring systems that utilize the low power unlicensed portion of the 220 band from 216-217Mhz. These things transmit periodic data bursts at around ...

Bill_G

No. Wrong direction. If it's distorted at -10, then it will be worse at 0. Perform the MTR alignment procedure for the wireline and deviation. It's built into the RSS.

Bill_G

Anyone else having issues with new AMTS 217Mhz block B auction winners interfering with unlicensed patient monitoring products in healthcare facilities?

Bill_G

Have you done the transmit audio calibration procedure, checked line levels, etc? MTR's are quite musical when adjusted correctly.

Bill_G

Open up the harness to the radio that can't be heard, and add a spkr.

Bill_G

Why would you want that? That should be an invalid state. The first to receive causes the other to transmit. ie: not receive. So, there would not be a second receive to get simultaneously. It's not present.

Bill_G

So, what kind of radios has this special needs student broken in the past?

Bill_G

In the Trbo repeater channel settings is a receive threashold setting. According to the help docs, if that level is qualified, it disables the station. How quickly does that enable/disable take effect? Does it effect calls in progress? What do you think happens when the interference causes that dete...

Bill_G

Anyone work with the Genesis 13 GW3 Trbo management and diagnostic suite?

Bill_G

On the plus side, you're half way to a new one, and there are a few shopping days until Christmas left!

Bill_G

The switch is on a flex circuit on the top panel. Use a plain old VOM to troubleshoot the switch. Brush up on your soldering skills to gently remove the flex.

Bill_G

If you have access to a service monitor, verify the radio does not operate with rx PL.
If the radio is new to you, it may have been modified previously for permanent monitor, or it was sold to you broken.

Bill_G

I was going to give a "?", but after re-reading this it will be for a 2nd control base and not on dispatch's radio in which you are correct. That's okay. I misread his post too. He already has a radio with an antenna on the roof. So, he can disregard a big portion of my recipe. But, he sh...

Bill_G

Bigred wrote:To get this to work, dispatch will have to have a remote also. Consider one that fits the day to day operation like maybe a gooseneck mic and a footswitch instead of a handset you have to pick up.

Dispatch will be heard through the repeater.

Bill_G

Can someone talk me through what is needed to set up a tone remote? Recipe to add a tone remote control - Ingredients: 1 mobile radio with an accessory port on the back with PTT, MIC HI, RX HI (preferably not off the volume control), and Ground 1 Tone remote adapter preferably with instructions or ...

Bill_G

You can use a single NXU2A at the radio, and link to it with PCNXU available at the JPS site as a free download. They would just use their laptop or PC to talk over the radio. The other option is a Barix. Thanks. They prefer not to use a computer. I thought about that and MIP5000. It's fairly econo...

Bill_G

Barix Annucicom 100 used by the railroad to control radios over Verizon / Cradlepointe. $395 for the Barix. Pretty DIY, but audio sounds great.

http://www.ip-audio.com/audio/annuncicom100.php

Bill_G

You can use a single NXU2A at the radio, and link to it with PCNXU available at the JPS site as a free download. They would just use their laptop or PC to talk over the radio. The other option is a Barix.

Bill_G

If the autotune isn't complaining about the tx freq unable to warp in, you could attempt to make adjustments on one mobile to see if you can dial it in. Otherwise, you should depot them all. When doing large migrations, it is not unusual to find batches of failing radios because (A) the agency never...

Bill_G

Have you got an Anritsu, and have you swept the lines / antenna?

Have you done site noise / desense test with and without the rptr keyed?

Bill_G

TX or RX fidelity test?

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