[Repeater-Builder] Cell Phone Connection to Repeaters
All, I saw one post about the Telular devices. These are great devices, we have 3 of them on our Mobile Command Post. Depending on the carrier, and device, they are capable of acting as a modem as well as phone. I just did a quick Ebay search for Cellular Terminal and also Telular and found a bunch of them out there from various manufacturers, new and used. Getting a sim card if needed or otherwise activating will likely not be done at the local reseller / mall kiosk. Your best bet is to talk to a commercial or gov't accounts rep with the carrier of your choice. In our case I called our Verizon gov't account rep with the ESN of the devices and selected the plan of choice. We were set up within hours and talking. (no sim card needed on Verizon) A couple police depts. Have installed them as a backup line on their PBX in case of backhoe fade. Bill N9SII
[Repeater-Builder] High Power Mastr II base station conversion to 2 meters
OK GE Mastr II experts, I have a question for you. Our club has been the benefactor of a local law enforcement agency's upgrade. We have acquired a VHF (155 mHz) Mastr II base station with 3 solid state PAs that total a rated output power of 225 watts. It appears to have a single PA power split into two outputs. each driving a second PA that is then summed back into a single output. I know the cable lengths of the splitters and combiners are critical. Also understood is the importance of cooling. What I am asking the experts on the list is: Is this a reasonable project to undertake converting to 2 meters (TX 145.XXX)? Obviously the tuning instructions will need to be followed precisely. This station has been in reliable service to the original owner for years. We are wondering about the reliability post conversion. If we do the conversion we would clean the old heatsink compound, replace it, and re-torque the transistor mounting screws, and change the appropriate cable lengths. Your thoughts appreciated.. Bill, N9SII
[Repeater-Builder] Re: PL vs. DPL
Coupon for a TS-32??? Where do I sign up??? Will it expire What do I do to transition to digital??? Maybe the Govt will rescue me and block the transition... Oh wait.. I was thinking of tv.. nevermind
[Repeater-Builder] Re: Simpler Radios, (Was PL vs. DPL)
Maybe that should be second part of the exam: Demonstrate proficiency at operating your newest acquired technology driven equipment. may be a big challenge for the VE..
[Repeater-Builder] Re: Are you ready for narrowbanding?
A couple of points here if I may .. 1) The narrowbanding kit sold by Communications Specialists will narrow the receiver bandwidth, but will not take into account modifications needed in the discriminator to deliver full rated audio output. Most later models use a discriminator IC that usually cannot be modified. If you get what you need by just turning the volume up higher, OK no problem... BUT... 2) Narrowband transmitters have to be designed AND FCC type accepted to work in the narrowband mode. This has to do with the overall emission envelope. Just turning down the deviation circuitry to 2.5 kHz will reduce the amount of deviation, but not the bandwidth of the emission overall. Turning down the deviation is simply not a legal option. If it isn't type accepted for Narrow Band it can't be used to transmit. There is a second caveat to turning down the deviation. since a lot of transmitters encode either digital or tone squelch injected without components (pots) allowing adjustment of the level, the transmitter will be sending those at +\- 600-800 Hz before narrowbanding. That equates to approximately 15% of the available modulation. When you narrowband, the transmitter will still be cranking out tone or digital signals that will now be at about 30% modulation. Obviously this is gonna have a horrible effect on transmitted audio quality. Any radio type accepted after February 14(?) 1997 was required to be capable of narrowband. In the case of the HT1000 for example, several versions were type accepted before, and did not include a narrowband mode while those type accepted afterward did. That is true for many radios from all manufacturers. The only tried and proven method is too 'read' each radio, and see what it can do. My experience is that most manufacturers have not been too enthusiastic in trying to compile lists model by model. I suppose I can understand that to a degree (ducking the rotten tomatoes) as they have long since discontinued support on a lot of these radios, and the task would be monumental considering the number of individual model variations /numbers for each individual series (HT1000 is the SERIES and H01RDC9AA3BN is the model number for one specific radio with a unique combination of options including frequency, band split, channels etc). In the case of the Midland ST1 radios, as I recall, the narrowband units were special order options. The basic 'normal' radio was not capable. January 1, 2011 will bring some interesting consequences. On that date it will be illegal to manufacture or import any radio with a wide band mode. There are some that say mixing w/n on the same channel will be detrimental to communications, others say it won't be a problem.. I guess we will see. Regardless, the adventure is just beginning... Bill N9SII http://groups.yahoo.com/group/Repeater-Builder/message/88021;_ylc=X3oDMTJxb WZiOXE2BF9TAzk3MzU5NzE1BGdycElkAzEwNDE2OARncnBzcElkAzE3MDUwNjMxMDgEbXNnSWQDO DgwMjEEc2VjA2Rtc2cEc2xrA3Ztc2cEc3RpbWUDMTIzMjIyOTY3Mg-- Re: Are you ready for narrowbanding? Posted by: w7...@comcast.net mailto:w7...@comcast.net?subject=%20re%3a%20are%20you%20ready%20for%20narro wbanding%3F w7...@comcast.nethttp://profiles.yahoo.com/afa5tp afa5tp Sat Jan 17, 2009 1:50 pm (PST) Hello Group, Isn't it true that the radio must be on the List of type excepted units? I have a brochure for the Midland syn1 radio that says it is capable of the 12.5 kHz splits and Narrow dev. (2.5kHz). I was told that the Syn1 was NOT on the list of type excepted radios. What about the Moto HT-1000? Have heard that some of the later serial numbers were narrow band accepted. Is there a list from NTIA or that tells which radios are going to be Legal to use on narrow band fxs? I guess just because you can change the I.F. filters, and knock down the deviation, some rigs just won't fly. 73's de Tim W7TRH Wa. -- Original message -- From: Chuck Kelsey mailto:wb2edv%40roadrunner.com wb2...@roadrunner.com They are. I am one that says there won't be a huge flood of radios hitting the surplus market. Everything sold in the past 10 (or more) years has been narrow band capable right out of the box. Chuck WB2EDV image001.png
[Repeater-Builder] Re: DC Power Supply Test Load
Eric, Don, and All, I have done something similar using RV light bulbs which are rated at 12 volt nominal. Wattages available are typically 60 and 100, which consume approximately 4.3 and 7.1 watts respectively. The bulbs are cheaper and fit any common household lamp socket (although wire gauge must be considered). For mine, I used porcelain open terminal sockets screwed to a 1x6 board, which I ultimately mounted to the wall of the shop. The bulbs are cheaper, and don't require fan cooling. I usually try to save P.S. load checking until the winter months when it serves as supplemental heat source ;-) ... And it brightens the days... Bill N9SII -- Original Message -- Don, It may be overkill to fabricate a load tester for just your 40A power supply, but it can be handy to have around. Here's what I suggest: Buy at least six 2 ohm 100 watt wirewound power resistors, and connect each one in series with a toggle switch such as might be used for controlling a ceiling light in your home. Connect each resistor-switch combination in parallel, and connect the array to the power supply output terminals. The resistors are available from Digi-Key or Mouser for less than $7 each in small quantities, and the switches are less than a buck apiece at Home Depot. Rig the resistors on standoffs so that a fan can blow on them for cooling. Here's how this load bank works, assuming 14 VDC output: 1 switch closed = 7 amps load = 98 watts 2 switches closed = 14 amps load = 196 watts 3 switches closed = 21 amps load = 294 watts 4 switches closed = 28 amps load = 392 watts 5 switches closed = 35 amps load = 490 watts 6 switches closed = 42 amps load = 588 watts 7 switches closed = 49 amps load = 686 watts 8 switches closed = 56 amps load = 784 watts, and so on. If you wanted smaller increments of load, use 4 ohm resistors rated at 50 watts. Such resistors are about four bucks each. You could also wire up a matrix of resistors so that several 2 ohm resistors handled increments of 7 amps, some 4 ohms resistors for 3.5 amp increments, and some 10 ohm resistors for 1.4 amp steps. With careful selection of resistor values, you can build a load bank that can cover a wide range of current with steps as small as you want. Just remember that a load bank will generate a lot of heat, so appropriate heat sinking and forced air cooling is mandatory. 73, Eric Lemmon WB6FLY
[Repeater-Builder] Needed: Motorola PL Reed; TLN-8381A
I am looking for one or more Motorola PL Reed; TLN-8381A on 79.7 Hz (WB) for a Club Repeater project (K9HAM). This is the one that goes in the SpectraTac voting and auxiliary receivers Coded Squelch module. I have several of the TLN-8381A, TLN-6824A and KLN-6209A reeds on assorted freqs to trade if you are interested. I also have Micor channel elements that I am willing to trade. If all else fails I can pay for the reed(s). Please email me off list == [EMAIL PROTECTED] Thanks Bill N9SII (This message cross posted to several groups)
[Repeater-Builder] RE: Ralph Hogan's website...
Ihave gone to the website. I was able to access the initial Micor Page, however the link labeled: " Ordering a UHF Micor Crystal for repeater service" goes nowhere. The Properties for the link goes to: file:///E:/webpages/w4xe/rpt/tech/uhfxtal.htm. Clicking on the link does nothing. Bill N9SII Yahoo! Groups Links To visit your group on the web, go to:http://groups.yahoo.com/group/Repeater-Builder/ To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
[Repeater-Builder] Re: maxtrac 100w ???
Motorola actually did make a few dash mount maxtrac mobiles. They are few and far between. Huge PA on the back As I remember, the whole radio is almost twice the size of a regular model. The ones I saw were VHF High (150-174 mHz). Bill N9SII Date: Wed, 9 Feb 2005 10:30:25 -0800 (PST) From: Ted Bleiman K9MDM - MDM Radio [EMAIL PROTECTED] Subject: maxtrac 100w ??? i wanna see a maxtrac do 100 watts mdm Neil McKie [EMAIL PROTECTED] wrote: What would you like to know? Neil - WA6KLA Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
