Batboard

chpalmer

Multiple SNV-12s Zetron 4048 Status tones. (By the way, on some e&m ports the cor will beat the audio by as much as 100ms. CISCO E&M and Harris Syncrocast are both guilty of this. This gives the snv-2 card full quieted audio for that period and can cause it to vote incorrectly. To prove this...

chpalmer

d119 wrote: Lastly, whats the latency like on a dedicated network? Could it backhaul voted audio without screwing up the voter?

Ive been told that these or any voip transport will not work well for voted audio transport. Id love to know your outcome!

chpalmer

The front end of the radio/repeater will take care of weeding out the out-of-bandpass adjacent channels.

Just remember... Depending on the radio this can be 30kc or so...

chpalmer

Couple of different reasons... Co channel user on same pl that occasionally gets in when conditions are right... this one would be bad- intermod product of one of the bands causing the other band to "lock open" the system... Someone programmed a whole lot of mobiles wrong and one stop at t...

chpalmer

Estimating the performance of a portable antenna is a very important part of coverage prediction. Optimally, you would use the specific recommendations of the manufacturer of the radio and antenna. If that data is not available, the values recommended in TSB-88 should be used. Anyone who is attempt...

chpalmer

People have done simulcast over that but I wouldnt suggest it...

RF links would do the trick though... Lowband rf link would be different...

Then keep using the phone lines for the receivers.

chpalmer

I once saw a G.E. station on a hilltop that said mastr lll on it. I had G.E. on my mind. [rant on] Those I wouldn't recommend to my worst competition due to the trouble we have had with them here and the lack of support. I was thinking we had the mastr 4 but I think they skipped that number to mastr...

chpalmer

Could always use the lowband as your audio path to your simulcast transmitters...

chpalmer

Im not familiar with Mastr lll stations. Are they crystal controlled? If it is then the clock would not be needed but the channel elements would have to be super stable. An amateur system I help with uses micors on two meters. The elements are from 800mHz stations and are extremely stable. Allen avi...

chpalmer

Never seen it here. But perhaps the extended shutdown and reboot cleared it for a time. Id be suspicious of that radio for a while.

Ive seen close proximity lightning do all sorts of funny things. Maybe what happened to yours...

chpalmer

More thoughts. Your transmitters both coming on at the same time at one site or another? They can be paralleled using the same key tones with each of the receivers still having their individual return paths to the voter. The jps sn12 when used with rx groups locks into the first group to receive cor...

chpalmer

Keep in mind that simulcasting lowband is never recommended. If you try it... Good Luck! Too much overlap. UHF on the other hand works great. The SNV12 can make a great crossband voter. But with major system changes in your future I have to ask why you wouldnt be designing the lowband out of your sy...

chpalmer

Take a look here for some links that could possibly help you...

http://batboard.batlabs.com/viewtopic.php?f=10&t=56882

chpalmer

In our area we have several transmitters that rely on phone lines to dispatch. We've installed small repeater makers on a couple of sites with backup pl tones. Dispatch has a backup basestation that can talk through these stations if needed. The cars also have these channels programmed in them.

chpalmer

Yes it is AND. What do you have for repeater hold in?

Why are you using "Access Code" on the VHF?

chpalmer

Bill - Did you figure this out yet? Are all the stations transmitters or do you have receivers only in the mix? A receiver going down could cause this. Is the console getting an open mike? Ive got a similar setup utilizing several MTR's, a JPS SNV-12, and Zetron 4000 under my watch across the water ...

chpalmer

It sounds like you have a cable for a rear control head.

chpalmer

Do you have a path? An unlicensed tsunami link, Motorola Canopy ect. could be made to work and if your rural enough, you wouldn't probably have to worry about other users. ... I really don't like the idea of unlicensed links but it could be put in place until funding becomes available for the licens...

chpalmer

Yes and the Min-V

chpalmer

Curious about your callsign...

Plane?

chpalmer

We service a hospital that we do half of what Jim suggested...

We have leaky coax on the receive side running down 4 floors and a 1/4~ mounted on the ventilation ducting for the transmit side. 15 watt transmit.

Works well.

chpalmer

Its actually quite a bit bigger than 8x. And very pliable. I wanted to run some tests on it and see how well it lasts with constant use...

Thanks

chpalmer

Anyone know what Shakespeare Lo-Max coax corresponds to?

Its outer diameter is 5/16" like rg6 but the center conductor is 1/8" stranded. Its 50 ohm cable.

I want to build some test cables from it...

chpalmer

Depends on what your using as an input. You might try using the discriminator audio pin 11 with "filtered audio" turned on in rss if it provides enough signal which it should. That way the volume pot of the radio wont have any affect on those speakers and can be used to control the local r...

chpalmer

Sorry for the confusion. I meant a 4 wire card would work if needed... :D We use 4 wire operation for dispatch also so that the dispatcher never is without the receiver in their ear. Safety reasons. 16 pin on an r1225 is the same as a m1225, gm300, Maxtrac, ect... Options for programmable pins may d...

chpalmer

Yes! I have a customer doing just that at their location. 4 wire will give you duplex operation should your remotes support it...

chpalmer

Just wanted to provide another link. http://wwcic.org/wwcic_es.html We do split antenna systems all the time, and all of them get filters. Your CDM's may be designed for a given frequency range but that does not mean that equipment transmitting out of band on that site wont get into the front end an...

chpalmer

I saw a handout on this car a couple of weeks back...

Its Diesel powered!

chpalmer

Jason- CDM mobile radios are not the radio of choice to be installed on a commercial radio site. And next to a cell tower, the ports of those radios will be seeing 24 hours a day of rf energy from the cellular stuff, due mainly to the fact that duplexers sold by all the big suppliers aren't designed...

chpalmer

Thanks for the info...

Are all Kenwood dealers the same? Sounds familiar...

chpalmer

Truthfully- Thats pretty cheap...

Is this on a radio site with other equipment?

chpalmer

Just to add- although we're not set up to triangulate, one could go to the power splitter and look at each of the antenna's manually and look at the signal strength of an interfering signal if it hung around long enough...

chpalmer

Its about the same This site is at the north end of the county so no north facing antenna was needed. Power is directed in three directions now. We took out probably 50 feet of 1/2 inch heliax and the antenna was probably 35 years old or so. We took a lot of loss out of the system but lost a little ...

chpalmer

We did this on the clock tower of a hundred year old courthouse because we had to use the windows on three sides. We had been on the roof with an omni but when the roof was redone they had us take it down and didnt want it back up there. We used 3 element yagis out the windows and a power divider. N...

chpalmer

http://www.broadcast.harris.com/product ... WNETXPRESS

The system constantly adjusts for the correct delay so that all site audio is in phase.

chpalmer

http://www.cplus.org/rmw/english1.html

chpalmer

VHF.

chpalmer

We have just installed a three transmitter simulcast system over IP using Harris Intraplex. Being involved in other simulcast systems I was very pessimistic about the ability for the timing to be constant but so far Its doing pretty good. The media it uses for transfer consists of Tsunami radio's, f...

chpalmer

The Argus supply is not designed to power the radio full time in case this is what your doing. It is there to charge the batteries and provide the revert to standby power when needed. If the radio has been powered long term from the Argus then it could be damaged. If the batteries are bad the Argus ...

chpalmer

We have had problems with the Rad Mus in that manner ourselves. Biggest problem is the downtime sending the units in for repair as they go to Israel. No experience with your config either. Would another solution be viable for them?

chpalmer

Are they using VOIP links?

What equipment is involved?

chpalmer

Id look at your input freq to see if any one else in the area has started using it. Even the output for that matter... We have a customer with the same thing here with 5 fire repeaters, all out on 110.9 but different inputs. Were looking to simulcast later but we need the infrastructure to allow tha...

chpalmer

Most dont like to talk about voip on an analog voting system... I cant imagine the trouble you could get into with an Astrotac system.

Some ptp's are available in a t-1 format I believe.

chpalmer

Try L1883A and L1884A They show as valid when I just looked them up.

chpalmer

Heres a link to the manual for the Argus.

http://www.repeater-builder.com/motorol ... harger.pdf

The station manual 68P81096E25-d (for the uhf stations) has information about the battery revert on page 30 of the "Installation" section.

chpalmer

#010-519-20 Argus number for the 12v

#010-523-20 Argus number for the 24v

Argus would not even talk to me about them last year.

We just ordered a 24v model last month. I hope this isnt a precursor to Motorola ditching the stations.

When I get to the shop later Ill look up our invoice.

chpalmer

Page 30 of the small manual that comes with the stations... for anyone looking. Motorola Numbers #L1883 For 12v systems #L1884 For 24v systems The battery cables have a PN also but I dont have that here. Sounds like you have them already though. From the manual- "DO NOT connect a battery direct...

chpalmer

The stations do not provide a charging circuit. What you have is a direct link to the 12 or 24 volt section of the power supply. The manual says not to connect batteries straight to the station. Im not sure what harm that would do to the station if any. You may just be overcharging the battery. Moto...

chpalmer

Does this happen with the CB off?

I like kf4sqb's theory. CB's are cheap and lack good filtering and shielding.

chpalmer

Selectone... Im not recomending them by any means. I only have experience with Transcrypt.

http://www.com-spec.com/selectone/product.htm

Search found 102 matches