David—searching my memory but believe you are correct, I know that there was a limit
Andy From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of dmur...@verizon.net Sent: Friday, October 23, 2009 11:44 AM To: Repeater-Builder@yahoogroups.com Cc: Repeater-Builder@yahoogroups.com Subject: Re: RE: [Repeater-Builder] Re: what pac-rt means Andy, if I remember correctly I think the counter only went to 10. After that well I would hope there were not more that 10 officers at any one scene. Probably different is CA. David Oct 23, 2009 06:34:43 PM, Repeater-Builder@yahoogroups.com wrote: Correct—David and it DID work ONLY when they keep their radios in the charger—on the CA CHP system if you listen on 154.905 you will clearly hear the beep as they exit their car—it is also a great way of keeping track of CHP cars which are close to you since all of the traffic they receive on their low-band radios is rebroadcast on the 154.905 channel if they do not have their portable in the charger and most don’t. Andy From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of dmur...@verizon.net Sent: Friday, October 23, 2009 11:28 AM To: Repeater-Builder@yahoogroups.com Cc: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: what pac-rt means Had a problem with the PAC-RTs when I worked in Virginia for the State Police. Most of the officers did not put the portable in the charger so when more than one officer arrived on the scene and took their portables with them all PAC-RTs would transmit when the officer would key his portable. When the portable is removed from the charger a tone is emitted to let other PAC-RTs set their counters so they do not repeat. Only the last one to arrive on the scene and pull his portable form the charger would repeat. If another unit arrives and pulls the portable from the charger that one is now the one repeating. David Oct 23, 2009 06:21:21 PM, Repeater-Builder@yahoogroups.com wrote: <mailto:Repeater-Builder@yahoogroups.com> <mailto:Repeater-Builder@yahoogroups.com> > Just to be clear the "drop" is planned, it is designed > so that when multiple cars are on the same scene only > one of them has a PAC-RT in operation, otherwise it would > be a zoo-so the drop is really the synchronization of > multiple PAC-RTs, The drop is a receiver "sample window" to allow the person (officer) with the portable the ability to quickly capture the return path (transmitter control) back to the dispatcher. Multiple "vehicular repeaters" listen for both activity and tones/codes to setup and maintain a queue of operation so only one repeater responds within a very local on scene coverage area. The sample and priority window values can be adjusted or disabled if you only have one unit for personal use or don't expect to use it for fast reply (emergency service) work. > ..the CHP, and Nevada used to use PAC-Rts. Pac-RT is the Motorola Name, GE made a version and Pyramid currently makes and sells them. (of course I'm a Dealer for Pyramid). I'm told Vertex and probably Icom also make them. Most of the current CHP vehicles use the GE or a special Pyramid (clone of the GE) unit. > Also, today you can find a lot of the mobile repeaters > around-and they make good portable repeaters- The Motorola and GE repeaters have specific special cables to interface to different radio models. You would normally need the proper cable and in some cases a matching radio with the corresponding control/interface circuit. The Pyramid and newer brand repeaters are much more generic in regards to the different radio brands/models they work/interface with. > HOWEVER, most of them, at least the GE ones, made sure > that the receiver sensitivity was very poor so that it > only picked up local HT traffic. A target value of about 50uV (micro volts) RX Sensitivity was specified by a number of agencies. Two officers on each side of a freeway/highway should be able to operate independent of each other. > If you have one you will find that in the first receiver > stage-the ICOM and associated components, there are a number > of caps which have been left out in order to keep the > receiver deaf. I've seen resistive pads and on board attenuators used to "numb up" the receiver front ends. They can be removed easy enough... > > I always found their selection of radios to be a bit > > odd until about 10 years ago. For a while they would use > > the GE system in the car and a Motorola for other systems, Government Public Safety (an oxymoron) > > but the two would never really synch properly and there > > was always the drop out every few seconds that was only > > about a half second long but none the less annoying! That is the receiver listen window mentioned above... > > I think they have changed systems now and don't have > > this issue anymore. Can be different sounding by design and programming... see the above text. > > Oh how I use to miss the days of California, now you > > couldn't pay me enough to move back! Plenty of work out here... minimum wage and all the pride you can swallow. s. <mailto:Repeater-Builder@yahoogroups.com> <mailto:Repeater-Builder@yahoogroups.com>
