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Re: Same feedline
Hey John, The commercial terminology for a duplexer/diplexer is a cross band coupler. That might help your search. https://www.solidsignal.com/m/product.aspx?p=80-05-07&utm_source=google&utm_medium=cse&utm_term=80-05-07&gclid=CjwKCAjw8uLcBRACEiwAaL6MSeMDnTYP7EG2RbGxYsk3fgXY5qR_BGThKc0_A9dlNA9s3cB1A9j1ahoCxjAQAvD_BwE Regards, Ross kc7rjk On Sep 11, 2018 1:43 PM, "john@... [Repeater-Builder]" <Repeater-Builder@...> wrote:
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Re: Voice ID'er for P25 Repeater
Ed McKinney
Hi I am interested in the VHF (2 meter ham) P-25. I read where they are 4TDM or something like that where four can have four conversations at once without interference with each, similar to trunking. Am I thinking right? For the whole group about P-25, is there a website I can go-to to learn P-25 deeply? Or, any PDF for downloading? I really had not learned much digital for in my past in the late 70s, they were talking about such in the W3C magazine. I use to read it at Texas Instrument's library. I do want to have a P-25 at my repeater stack of analogs. Also, can a P-25 be tied/linked with the analogs via an audio bridge? Well, a lot to learn! So, thanks in advance! TTFN! ____________________________________________________________________________________________ Seven? Three Ed McKinney - _______________________________________________________________________________ ?????????? an under servitude to the muslims ?????????? in any way or form. ____________________________________________________________________________________________ On Wed, Sep 12, 2018 at 1:24 PM Brett Friermood brett.friermood@... [Repeater-Builder] <Repeater-Builder@...> wrote:
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SK- Paul Dumdie Jr, W9DWP
I just saw this on a local FB group-?Paul Dumdie Jr, W9DWP passed away. I know Paul was a very active member here at RB, and he was a big part of repeaters here in northern IL. I don't have any more details, but thought many here that knew him would want to know. He will be missed. Tom W9SRV ? |
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Re: Same feedline
Gary HENDRICKSON
John, Several years ago I had a similar situation where I needed to install a tri-plexer on top of a tower.? The feedline was being used for 6 M. and 2 M. repeater receivers, and 440 link transmitters. Being concerned about whether the triplexer was properly weatherproofed, I mounted it inside a weatherproof metal box, with type N feedthrus, and attached it to a tower leg.? When I took it down some 10 years later, the inside of the box was clean and dry, and the triplexer looked almost new.? Of course, I had covered the coax connectors properly, and never ran into any problems with any of the jumper cables for the 6, 2 or UHF antennas (which, when using a di- or tri-plexer) can be of any appropriate length. Good luck es 73, Gary? W3DTN On Tuesday, September 11, 2018 9:31 PM, "john@... [Repeater-Builder]" wrote:
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Thank you for all the input. I know a diplexer would be needed at the bottom side at a minimum in addition to the Bp/Br duplexers for each repeater. The topside is what I was wondering about. The only diplexers I can find online so far are for microwave frequencies or the diamond and comet ones which are of concern to me since this will be up on the tower and I don't climb. Does anyone have a recommendation for something better ? I'm trying to go as worry free but reasonably priced as possible. I may ultimately forgo the 6m at the location if I have to. I have someone who will be climbing to put the antennas and feed line on the tower so I'm trying to keep things as compact as possible since they are donating their time.
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Re: Ge mastr ii mobile IF tuning module
¿ªÔÆÌåÓýOn 9/12/2018 1:15 PM, 'Mike Langner'
mlangner@... [Repeater-Builder] wrote:
Confirmation of tin whisker problem ¨C many of us have had it happen to them.? It¡¯s very real.??This was written up years ago: Also, look at this for a different problem: 73, Joe, K1ike |
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Re: Voice ID'er for P25 Repeater
On 9/12/2018 12:34 PM, Ed McKinney kb8qeu@... [Repeater-Builder] wrote:
Not quite. It is ti ID every 10 minutes when a QSO is going on, along with Ummm...doesn't it still have to ID in analog? |
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Re: some simulcast questions
On 9/10/2018 5:28 PM, Matthew Kaufman matthew@... [Repeater-Builder] wrote:
Another thing to think about is to do what a few fire departments around Or better yet, use the same input and output, same tone on output, different tones on each input. Program channels for each site, and they can switch as needed. But all will hear all sites, depending on coverage and location. |
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Re: Ge mastr ii mobile IF tuning module
Mike Langner
¿ªÔÆÌåÓýConfirmation of tin whisker problem ¨C many of us have had it happen to them.? It¡¯s very real.? I operate a 442.6/447.6 ?MASTR II repeater with the main repeater receiver and three auxiliary receivers.? Three of the four receivers have had the tin whisker problem.?
? Mike Langner (505) 898-3212 home/home office ? From: Repeater-Builder@... [mailto:Repeater-Builder@...]
Sent: Wednesday, September 12, 2018 11:04 AM To: Repeater-Builder@... Subject: Re: [Repeater-Builder] Ge mastr ii mobile IF tuning module ? ?
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Re: Ge mastr ii mobile IF tuning module [1 Attachment]
Der Fragalemeister : The O'le Tron Herder
I guess you are trying to send a picture of your hardware,but all I get is a 214 byte piece of trim like thing. No matter, those of us in the biz know what you are talking about.
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? ?I had the occasion to work with these radios for about 5 years,and I didn't encounter the tin whisker that others seem to have, but I had quantities of adjusting cap screws that would corrode in their bores and cause themselves to loose a DC ground ..thus making a few PF cap- as it approached the top of the helical coil within the cavity- to become more like a piece of plastic .? ? ? Most of the time you could just give the screws a short twist -with accompanying sound of a small crack sound - which would suddenly boost your RX sens at least 10db at a time. I don't think I ever found more than 2 screws at a given time exhibiting the symptoms,but it happened to almost all of our ~350? VHF mobiles ..and in other UHF services the same thing occurred. ? ? Purely a metallurgical problem - RCA's and I think Johnsons of that day had a similar cavity configuration but were made of different metal alloy and adjusted slightly differently ..exhibiting no such problems. ? ? GE contracted with the Ben F. Nye company from Mas. or Con. or somewhere up East, that made stuff called NYOGEL. A version was the cure for corrosion of control head pin to socket problems ,but the black slurry that was for the cavity problem usually permanently cleared the stuck screw syndrome.? ? That screw grease was laced with micro grit of something sufficiently metal to clear and then bridge the screw thread gaps into the casting, and made a very good ground for the screw to casting surfaces. ? ?This stuff was like printer's ink as to how badly it stuck to anything it touched ,staining hands for a long time -unless you had GOOP or some commercial pumice based hand cleaner to get it off with. ? ? I have successfully used NO-Al-Ox -from ACE hardware or other electricians supply outlet as a replacement for NYOGEL.? ? ? ?As for a replacement casting, I doubt that you will find any new ones anywhere. ? ? ?The replacement castings were characterized by not having as bright a chromed look to them,but otherwise appeared identical. ? ? ? As to the tin whiskers, I have heard of guys running a Q tip around inside the cavity to snag them, and then using some kind of cleaner /anti corrosive as a chaser. I never had that problem sufficient to be conversant in the specifics. As we were? a LEO /local Gov't shop, with future sales in the works, we were quickly enrolled in the One for One swapout as needed Club by GE. ? ? ? ?Subsequent radio models abandoned that exact kind of cavity system, thank Pee Wee Herman. ? ? ? The cavities are pretty easy to pull apart ,but I'd recommend you try the grease first (just run the screw out all the way and apply the grease sparingly as you run it back in and out a few times to really coat the threads. ? ? ? Peak? the cavity and move on. ? ? ? If you can't get the whole thing down to below 1uv ,it's time for a tear down and de whisker. If still too low, it's probably time for a Witch Doctor. ? ? ? I have no memory of the part number for the better castings,and suspect that they are automatically registered as obsolete and crossed to the newer part number ...IF even still shown.? Lots of Luck. DWF Pinellas CO. Sheriff's Dept Ret.2009 In a message dated 9/12/2018 11:11:52 AM Eastern Standard Time, Repeater-Builder@... writes:
Hi, sorry I did mean the multiplier injection casting.? I understand there was a better replacement for them¡ Sent from Mail for Windows 10 From: 'Der Fragalemeister : The O'le Tron Herder' DWFComm@... [Repeater-Builder] Sent: Tuesday, September 11, 2018 11:47 PM To: Repeater-Builder@... Subject: Re: [Repeater-Builder] Ge mastr ii mobile IF tuning module ? ? Are you talking about the front end and multiplier/injection casting? ? I have apparently missed out on some other kind of "metal Flaking" if so. ? THe castings are famous for tuning screw to bore corrosion and then there's the tin whisker problem with in the casting, but I hadn't heard of an IF type metalic problem. ? DWF In a message dated 9/11/2018 11:15:38 PM Eastern Standard Time, Repeater-Builder@... writes: Does anyone know where I can find one of the better, modified vhf IF tuning coil modules that doesn't have the metal flaking problems.? I understand there was a better one that is not prone to this problem....tnx...Kerry, wa2nan Kerry@... Sent from my Verizon 4G LTE smartphone |
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Re: Voice ID'er for P25 Repeater
I would also question the need/want for a voice ID on P25, though if adjusted properly and unlike most voice IDs it may work well. As for how, it greatly depends on your equipment. Often P25 repeaters are transparent where they receive the data, perform FEC, and rebroadcast. There are a few that have builtin interfaces but others require additional equipment. Quantars, for example, are transparent repeaters and require a DIU3000 to interface at a wireline level.
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Re: Voice ID'er for P25 Repeater
Ed McKinney
Not quite. It is ti ID every 10 minutes when a QSO is going on, along with CW ID, a voice would be nice. It does ID with CW now. I know commercial P-25s are ti ID every 15 minutes! On them, I understand no need for voice for the end users are not interested. ____________________________________________________________________________________________ Seven? Three Ed McKinney - _______________________________________________________________________________ ?????????? an under servitude to the muslims ?????????? in any way or form. ____________________________________________________________________________________________ On Wed, Sep 12, 2018 at 12:04 PM Ron Sales rre49sale@... [Repeater-Builder] <Repeater-Builder@...> wrote:
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Re: some simulcast questions
Jed,
The first thing you are going to need if you are going to attempt this personally is a very large liability insurance policy.?? Simulcast, particularly for public safety is not something that should be approached without having the appropriate knowledge base and engineering resources.? If this was for amateur radio it would be a different story - in public safety if you get it wrong people can die - so I highly recommend getting a vendor involved who has the necessary resources to successfully implement a solution. Since you mention that you think the Quantar is old (which they are getting quite old - for public safety service - in most cases) and want something newer your best bet would probably be one or more Motorola GTR 8000s combined with a GRV 8000 Comparator.? This is the current equivalent solution to Quantar/AstroTac 3000 and uses Ethernet backhaul.? Both solutions (Quantar/AstroTac 3000 and GTR 8000/GRV 8000) support mixed-mode voting and simulcast - so you can use Analog today while having a path to P25.? These are far superior to the SNV-12 solution which is Analog-Only and has to be interfaced to whichever base radio you choose. Analog voting and simulcast takes a LOT of testing and adjustment to get right and when you start mixing equipment that is not specifically designed to work together such as the SNV-12 and whatever base radio you choose - the results tend to suffer.? I have setup SNV-12s before and I always thought the audio quality was fairly poor even when properly aligned - and with repeaters that usually sounded good in stand-alone mode.? Not saying that it is not a good product - it just wouldn't be my first choice. I would start by having a qualified company perform a full evaluation of the system including a coverage study to determine what needs to be done to achieve the desired coverage.? It could be as simple as an antenna change or as complicated as a multi-site voted simulcast.? It is even possible that the issue is the subscribers not the repeater - maybe everyone is using stubby antennas on their radios and switching to whips would resolve the issue. Again - in a public safety system the safety of the public as well as the first responders is at risk if things are not done right - so it simply is not worth it to try to shortcut things the same way you might for amateur radio.? Do it right or don't do it at all. Dan Woodie, CETsr KC8ZUM |
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Re: Voice ID'er for P25 Repeater
Personally I don't see the need - but -?
There are two options that could work for this.? One is to use the wireline input and use analog for your voice announcement.? The other is to use a surplus DIU to vocode the announcement and inject it that way via V.24.? In either case I would recommend setting the wireline as lower-priority than repeat so it won't step on users and keep the CWID enabled for compliance in case a voice ID is missed.? The audio source for these announcements could be just about anything - from a raspberry PI (with a sound card) to a regular repeater controller.? The DIUs have come down in price significantly and can be had for under $100.? They are very handy for a number of applications also including audio logging/streaming.? This assumes you are running a Motorola Quantar or GTR 8000 and have a wireline card with the V.24 Daughter board.? If you don't they are widely available for reasonable prices. Dan Woodie, CETsr KC8ZUM |
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Re: Voice ID'er for P25 Repeater
Ed McKinney
I am interested in that as well! ____________________________________________________________________________________________ Seven? Three Ed McKinney - _______________________________________________________________________________ ?????????? an under servitude to the muslims ?????????? in any way or form. ____________________________________________________________________________________________
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Re: Ge mastr ii mobile IF tuning module
Kerry
¿ªÔÆÌåÓýHi, sorry I did mean the multiplier injection casting.? I understand there was a better replacement for them¡ ? Sent from for Windows 10 ? From: 'Der Fragalemeister : The O'le Tron Herder' DWFComm@... [Repeater-Builder]
Sent: Tuesday, September 11, 2018 11:47 PM To: Repeater-Builder@... Subject: Re: [Repeater-Builder] Ge mastr ii mobile IF tuning module ? ? ? ? Are you talking about the front end and multiplier/injection casting? ? I have apparently missed out on some other kind of "metal Flaking" if so. ? THe castings are famous for tuning screw to bore corrosion and then there's the tin whisker problem with in the casting, but I hadn't heard of an IF type metalic problem. ? DWF In a message dated 9/11/2018 11:15:38 PM Eastern Standard Time, Repeater-Builder@... writes: ?
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Re: Voice ID'er for P25 Repeater
Ron Sales
Why ruin a good repeater with junk like that P25 is supposed to be quiet. From: "'Rob Lee' rob@... [Repeater-Builder]" To: Repeater-Builder@... Sent: Tuesday, September 11, 2018 9:43 PM Subject: [Repeater-Builder] Voice ID'er for P25 Repeater
?
Looking for just a voice identifier for a P25
repeater. Any suggestions?
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Re: Ge mastr ii mobile IF tuning module
Der Fragalemeister : The O'le Tron Herder
? Are you talking about the front end and multiplier/injection casting?
? I have apparently missed out on some other kind of "metal Flaking" if so.
? THe castings are famous for tuning screw to bore corrosion and then there's the tin whisker problem with in the casting, but I hadn't heard of an IF type metalic problem.
? DWF
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Ge mastr ii mobile IF tuning module
kerry
¿ªÔÆÌåÓýDoes anyone know where I can find one of the better, modified vhf IF tuning coil modules that doesn't have the metal flaking problems.? I understand there was a better one that is not prone to this problem....tnx...Kerry, wa2nan Kerry@... Sent from my Verizon 4G LTE smartphone |