Re: [Repeater-Builder] Re: TX max power
On Thu, 28 May 2009, wb8art wrote: Thanks Eric, That is exactly what I was needing to know. This will give us a good starting point and since it is looking to run only 35 watts it should be OK. That is better than I expected. Anyway I believe it, (the duplexer) is only rated at 50 watts. Can some one with one of those fancy programs like Comm-Shop run it and tell me the max power a Exec II on UHF ham band run with a 75 isolation mobile duplexer. Assuming that the coax and ant are a ideal setup. Assuming the repeater is mobile, one shouldn't need more than a decent location and 5-15 watts of power, 25 watts on the high-side. If you go to 10W instead of 100W, you only need 64 dB of isolation given the other person's calculation. -- Kris Kirby, KE4AHR Disinformation Analyst
Re: [Repeater-Builder] Two questions
On Sat, 9 May 2009, w4sef wrote: I am new at the GE Mastr II gameIs there a point on the receiver board where I can tap off to get an S meter reading? I would like to be able to monitor the signal incoming. Also, be able to see if there is any rise in meter reading with no signal coming in to check for desense with the transmit on and off. I had a Micor and knew where to tap the second limiter for a meter reading on signals but can not find the right place on the Mastr II. Also, I am using the Pion Controller board. I love the controller but I can NOT get it to transmit the CTCSS tone. I have tried every setting I can think of using the computer to program it but no luck. It will DECODE fine but will NOT send the tone! Any ideas? On mine I actually found a DIP-switch controlled CTCSS board. I could locally generate the CTCSS signal without actually installing the jumper. I will warn you: GE Mastr IIs can have a million jumpers installed in various places all over the chassis. Give it a good once-over and make sure that everything goes where it should. Just as many of them were left in original state as were hacked or rewired. They are good, simple radios however. If you can find a local tech who worked on them who is willing to walk you through the paces, it is worth the time. Having the right GE test set helps as well. If you find a radio that doesn't have much issue transmitting but has a deaf reciever, you might assume the radio has been struck by lightning. I have a station that exhibits this problem. -- Kris Kirby, KE4AHR Disinformation Analyst
[Repeater-Builder] Exec II input problem
Wonder if anyone has had this problem and know what the problem is. I am working on a GE Exec II repeater (converted mobile) which has no Comb no. I any case the issue is that if I move around the cable feeding it with a generator I was seeing a change in the recieve. I went directly to the RCA jack, and then found that just making connection with the center pin, I have about 10 to 20db stronger recieved signal than when I push it all the way in making the ground connection. This is a mobile and the RF deck is no. is 19D417075G14 rev A covered by LBI30032E. This shows a option of either non floating ground or floating ground input. This one is a non floating ground one. Might have been changed but I have know knowledge of its history. The RCA jack center pin connects directly with a wire thru a hole to the first helical and I have looked and can see no connection issues and measures a short with an ohm meter. I even reheated the solder joints and no change. Anythoughts would be appreciated. Randy
[Repeater-Builder] Tripplite Inverters
Anyone every had any problems with Tripplite 12vDC to 110vAC inverters? I am thinking of permanently mounting one in my car but I don't want one if it causes RFI or other problems. thanks
Re: [Repeater-Builder] Exec II input problem
One of two things come to mind. GE uses a short center pin RCA plug. If you are using a regular length RCA plug, the center pin will be too long and may short if pushed in too far. The other thing that comes to mind is that when plugging in your signal generator, and the shield doesn't make contact with the jack, you may see a higher than normal signal level. I assume this happens because the signal generator has an impedance imbalance because it's not property terminated. (Someone else may jump in and explain this in more detail). Chuck WB2EDV - Original Message - From: wb8art wb8...@netzero.net To: Repeater-Builder@yahoogroups.com Sent: Thursday, May 28, 2009 5:02 PM Subject: [Repeater-Builder] Exec II input problem Wonder if anyone has had this problem and know what the problem is. I am working on a GE Exec II repeater (converted mobile) which has no Comb no. I any case the issue is that if I move around the cable feeding it with a generator I was seeing a change in the recieve. I went directly to the RCA jack, and then found that just making connection with the center pin, I have about 10 to 20db stronger recieved signal than when I push it all the way in making the ground connection. This is a mobile and the RF deck is no. is 19D417075G14 rev A covered by LBI30032E. This shows a option of either non floating ground or floating ground input. This one is a non floating ground one. Might have been changed but I have know knowledge of its history. The RCA jack center pin connects directly with a wire thru a hole to the first helical and I have looked and can see no connection issues and measures a short with an ohm meter. I even reheated the solder joints and no change. Anythoughts would be appreciated. Randy
[Repeater-Builder] Request for Space / Introduction Letter
I wonder if anyone has made a request recently ( or maybe not so recently ) for roof space for a repeater / antenna(s), and has a letter that they have used successfully to ask a building owner, etc for space to do so? I met with a building manager today who was more than 'receptive', but needs something in the way of a formal request letter to go to the owner of the building. As much as I have not done this in nearly 20 years, any help would be appreciated. Thanks a lot. - Mike
Re: [Repeater-Builder] Exec II input problem
Sounds like whisker growing in the helical cavity. wb8art wrote: Wonder if anyone has had this problem and know what the problem is. I am working on a GE Exec II repeater (converted mobile) which has no Comb no. I any case the issue is that if I move around the cable feeding it with a generator I was seeing a change in the recieve. I went directly to the RCA jack, and then found that just making connection with the center pin, I have about 10 to 20db stronger recieved signal than when I push it all the way in making the ground connection. This is a mobile and the RF deck is no. is 19D417075G14 rev A covered by LBI30032E. This shows a option of either non floating ground or floating ground input. This one is a non floating ground one. Might have been changed but I have know knowledge of its history. The RCA jack center pin connects directly with a wire thru a hole to the first helical and I have looked and can see no connection issues and measures a short with an ohm meter. I even reheated the solder joints and no change. Anythoughts would be appreciated. Randy No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.339 / Virus Database: 270.12.43/2139 - Release Date: 05/28/09 08:10:00
Re: [Repeater-Builder] Tripplite Inverters
I've had problems with Tripplite power supplys. They randomly explode and the company won't give you a schematic to fix one, but they will gladly sell you another. On Thu, May 28, 2009 at 2:15 PM, JOHN MACKEY jmac...@usa.net wrote: Anyone every had any problems with Tripplite 12vDC to 110vAC inverters? I am thinking of permanently mounting one in my car but I don't want one if it causes RFI or other problems. thanks Yahoo! Groups Links
RE: [Repeater-Builder] Tripplite Inverters
John, I use to Volunteer working Midnight Security at a large Church, and I had My Ham equipment in the Veh . I did not have a DC Adapter for My old IBM Laptop , So I got a Tripplite 300 Watt Inverter to power it , I the RF Generated Noise was so bad I could only hear Strong PKT And other Digital signals , The RF Hash was so bad on My Icom 706 Mk-2 It blocked most Signals on HF . The design may have changed since then but that was My experience Good Luck Don KA9QJG
RE: [Repeater-Builder] Tripplite Inverters
How long ago was that or how old was the unit. Tripplite just came out with a new line of inverters about a year or 2 ago. Do you happen to know the model of the unit you had that generated the RF hash? -- Original Message -- Received: Thu, 28 May 2009 03:33:01 PM PDT From: ka9qjg ka9...@wowway.com To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Tripplite Inverters John, I use to Volunteer working Midnight Security at a large Church, and I had My Ham equipment in the Veh . I did not have a DC Adapter for My old IBM Laptop , So I got a Tripplite 300 Watt Inverter to power it , I the RF Generated Noise was so bad I could only hear Strong PKT And other Digital signals , The RF Hash was so bad on My Icom 706 Mk-2 It blocked most Signals on HF . The design may have changed since then but that was My experience Good Luck Don KA9QJG
[Repeater-Builder] No One Ever asked?
I wonder if anyone has made a request recently ( or maybe not so recently ) for roof space for a repeater / antenna(s), and has a letter that they have used successfully to ask a building owner, etc for space to do so? I met with a building manager today who was more than 'receptive', but needs something in the way of a formal request letter to go to the owner of the building. As much as I have not done this in nearly 20 years, any help would be appreciated. Thanks a lot. - Mike
[Repeater-Builder] Purc 5000
Greetings to the Group I have a Purc 5000 paging transmitter that I am trying to convert to 900mhz. It is programmed via eprom to TX frequency of 934.mhz. I have a code plug eprom burned for it but I have not installed it yet. When I connect the station to power it goes into transmit right away. It has 2 PA's in the cabinet but only one is connected. Output was about 50 watts but I managed to locate the PA power level pot and have turned down the output to 15 watts until I can figure this beast out. I don't have much documentation on it. And what I have been able to find here and on other parts of the internet is mostly based on the MSF 5000. What I do have is the model # C85JLB1106ASP02, the purc control board # TLN2774A03, Tone Remote Control Board # TLN2775A05, there is a 3rd large board that I could not find any number on, and 2 PA'S model 1242 and 1212. (1242 is the one connected) If any one can help with any documentation or experience with this station it would be muchly appreciated. Randy VE3JPU
