[Repeater-Builder] Re: West Coast Electronics
hybridfan wa6...@... wrote: OK, since we've activated the Wy Back Machine again, does anyone remember the VHF high band West Coast Electronics remote mount mobiles? I'm still looking for photos of the radio, especially an interior picture and control head. These were built in Los Angeles, used an 832A in the final and had silver plated tuned lines in the receiver rf stages. I know San Diego Yellow Cab used them in the early 60's. That's how we got our FM start down here. The model was MFM 15-150B. Ken No good deed should go unpunished... I asked Geoff who operates a very nice CHP History web page at: http://www.wb6nvh.com/ ... and he replied with the following. [pasted text] West Coast Electronics was a division of, or somehow hooked up with, Mobile Communications Company of Los Angeles. It is my understanding that they were wholly owned by Yellow Cab and existed from only about 1949-54, more or less. Apparently Yellow Cab did not like paying the prices Motorola and GE were asking for their gear. They never branched out to public sales, as far as I can tell, as no one has seen an example with ownership documentation other than a Yellow Cab franchise somewhere. They made at least two mobile radios, a two-piece and a one-piece set. Dynamotor powered. Quite a bit smaller than Motorola, and cheaper in design. As Ken says, they used an 832 in the PA, probably because 832's were available on the war surplus market for about fifty cents at the time. The control head, at least the one I saw on an old Superman serial (!) was just a square box with pilot lamps and a volume control, with a Western Electric F3 handset hanging across the lower portion. I have an example of the transmitter from a two piece set and can send you photos when I find what I did with them. They are probably in my computer at home. In a true comment of what it is often like working in an independent mobile shop, my transmitter, tagged with Yellow Cab of Salinas, California had a yellowed scrap of paper wadded up and crammed inside the crystal oven. Written in pencil, the note on it says: Unable to warp back on frequency. He made me use it anyway. [end of pasted text] cheers, skipp
[Repeater-Builder] Re: Micor UHF Repeater Base 9.6 vdc current requirement?
Jeff DePolo j...@... wrote: Mo's spec for the 9.6V supply is +/- 0.3V on station power supplies and +/- 0.5V for the regulator in Micor mobiles if I remember right. Looks good... I actually found the manual to the external power supply adapter I saw at a repeater site. Looks like the 9.6 Vdc regulator is inside the box and the results are supplied to the back plane through a/the Micor Mic Style Plug connection. The diagram for the adapter box also shows +13 Vdc is also routed to one of the pins in the same plug (as well as ground) so I have to figure out if that's a requirement or just an addition to the adapter package. I did see where +13 Vdc was supplied to another location on the repeater back-plane. I use LM7810's (10V 1A fixed regulator), with a 1A Schottky rectifier diode (1N5817 for example) in series with the output for a little voltage drop. Works for me as does a few of the other possible circuits others have mentioned (thank you very much). Regulator + diode + filter/bypass caps = less than $1, or knowing how big your junk box is Skipp, probably $0. That's probably the cheapest solution. The 2010 Politically Correct phrase for junk box parts is stuff I plan to use some day. I'll be fine as long as the camera crews from the TV Show Hoarders doesn't come out to the west coast. There are a lot of us in denial... which is not a river in Egypt. Heat-sink regulator to whatever's handy, tab on the regulator is ground as I'm sure you know... -- Jeff WN3A I'm thinking of something mounted right on the Repeater Back Plane so the leads are short and there's not a requirement for another box to take up rack space. thanks much, s.
[Repeater-Builder] Manual for HAL ID-1000?
I was recently given a HAL ID-1000 identifier. It's a 1RU cabinet device with connections and test jacks on the back. Seems to be diode-matrix programmed. Wouldn't mind setting it up for my call and maybe using it for something down the road. Does anyone have a manual or any idea how it is programmed? Thanks, Chris surf_bo...@yahoo.com
RE: [Repeater-Builder] Re: Micor UHF Repeater Base 9.6 vdc current requirement?
The diagram for the adapter box also shows +13 Vdc is also routed to one of the pins in the same plug (as well as ground) so I have to figure out if that's a requirement or just an addition to the adapter package. I did see where +13 Vdc was supplied to another location on the repeater back-plane. Yeah, the regulated power supplies come to the station backplane via that multi-wire harness and the microphone style plug. I don't think unregulated DC is in that harness; that connection is usually made by a separate two-wire (red/black) harness with an in-line fuse holder to two screw terminals on the backplane. I'm thinking of something mounted right on the Repeater Back Plane so the leads are short and there's not a requirement for another box to take up rack space. I was envisioning mounting it to something metal for heatsinking purposes, but I guess you could probably use one of the screws on the backplane plus a little TO220 heat sink. Whatever works...and doesn't make smoke. --- Jeff
Re: [Repeater-Builder] Re: Micor UHF Repeater Base 9.6 vdc current requirement?
How about a 7809 regulator IC with a 1N4004 diode in the ground leg to raise the output voltage to 9.6V? I was envisioning mounting it to something metal for heatsinking purposes, but I guess you could probably use one of the screws on the backplane plus a little TO220 heat sink. Whatever works...and doesn't make smoke. --- Jeff Yahoo! Groups Links
[Repeater-Builder] Re: Micor UHF Repeater Base 9.6 vdc current requirement?
Hey Skipp, Have a look here... http://www.bcfmca.bc.ca/rptvhfmods.html Cheers! Lee --- In Repeater-Builder@yahoogroups.com, skipp025 skipp...@... wrote: Jeff DePolo jd0@ wrote: Mo's spec for the 9.6V supply is +/- 0.3V on station power supplies and +/- 0.5V for the regulator in Micor mobiles if I remember right. Looks good... I actually found the manual to the external power supply adapter I saw at a repeater site. Looks like the 9.6 Vdc regulator is inside the box and the results are supplied to the back plane through a/the Micor Mic Style Plug connection. The diagram for the adapter box also shows +13 Vdc is also routed to one of the pins in the same plug (as well as ground) so I have to figure out if that's a requirement or just an addition to the adapter package. I did see where +13 Vdc was supplied to another location on the repeater back-plane. I use LM7810's (10V 1A fixed regulator), with a 1A Schottky rectifier diode (1N5817 for example) in series with the output for a little voltage drop. Works for me as does a few of the other possible circuits others have mentioned (thank you very much). Regulator + diode + filter/bypass caps = less than $1, or knowing how big your junk box is Skipp, probably $0. That's probably the cheapest solution. The 2010 Politically Correct phrase for junk box parts is stuff I plan to use some day. I'll be fine as long as the camera crews from the TV Show Hoarders doesn't come out to the west coast. There are a lot of us in denial... which is not a river in Egypt. Heat-sink regulator to whatever's handy, tab on the regulator is ground as I'm sure you know... -- Jeff WN3A I'm thinking of something mounted right on the Repeater Back Plane so the leads are short and there's not a requirement for another box to take up rack space. thanks much, s.
Re: [Repeater-Builder] Re: Micor UHF Repeater Base 9.6 vdc current requirement?
Hi all. Built up a copy of the DC supply that was in a old Micor manual. Used the caps and filter choke from an old supply. Add a LM 317 with heat sink. Added MOV's and additional hf caps. Seemed to work fine. This fed a full micor repeater with all the normal modules. Worst case 9.6 volts current was about .75 amps. Have this on a repeater up in Montana. Ralph, W7HSG - Original Message - From: DCFluX dcf...@gmail.com To: Repeater-Builder@yahoogroups.com Sent: Friday, February 26, 2010 2:59:59 PM GMT -07:00 US/Canada Mountain Subject: Re: [Repeater-Builder] Re: Micor UHF Repeater Base 9.6 vdc current requirement? How about a 7809 regulator IC with a 1N4004 diode in the ground leg to raise the output voltage to 9.6V? I was envisioning mounting it to something metal for heatsinking purposes, but I guess you could probably use one of the screws on the backplane plus a little TO220 heat sink. Whatever works...and doesn't make smoke. --- Jeff Yahoo! Groups Links
Re: [Repeater-Builder] Re: Micor UHF Repeater Base 9.6 vdc current requirement?
DCFluX wrote: How about a 7809 regulator IC with a 1N4004 diode in the ground leg to raise the output voltage to 9.6V? There is nothing mysterious about 9.6 volts. It could be 9.00 volts 10.00 volts 11.00 12.00 volts or *anything* in between. The part that is critical is that it is stiffly regulated. Something less than 10.6 volts was chosen because that is the point where a lead acid battery is technically totally depleted. This means the critical circuitry (oscillators, multipliers, etc.) are always fed with stable power to the point where the battery is dead. In a station, the 9.6 volt circuitry *could* be run from 12 volts, as long as its regulated. I'm not suggesting someone does that, because the circuits were optimized for 9.6 volts, but I'm trying to make a point. If it were me, I'd just use a 9 or 10 volt three terminal regulator (7809 or 7810) and skip the whole LM-317 or diodes in the ground leg deal. It only serves to make the circuitry more involved , harder to mount, and for NO advantage whatsoever. Kevin Custer
Re: [Repeater-Builder] Re: Micor UHF Repeater Base 9.6 vdc current requirement?
In that case Just a straight 7809 or 7810 also would not require isolating the tab and can be mounted straight to the metal chassis. If it were me, I'd just use a 9 or 10 volt three terminal regulator (7809 or 7810) and skip the whole LM-317 or diodes in the ground leg deal. It only serves to make the circuitry more involved , harder to mount, and for NO advantage whatsoever. Kevin Custer
Re: [Repeater-Builder] Re: Micor UHF Repeater Base 9.6 vdc current requirement?
DCFluX wrote: In that case Just a straight 7809 or 7810 also would not require isolating the tab and can be mounted straight to the metal chassis. If it were me, I'd just use a 9 or 10 volt three terminal regulator (7809 or 7810) and skip the whole LM-317 or diodes in the ground leg deal. It only serves to make the circuitry more involved , harder to mount, and for NO advantage whatsoever. Kevin Custer Folks might consider using an LM2940-9 or LM2940-10 (or another LDO regulator) instead of the 7809 / 7810 as the dropout voltage is much lower (0.5V on the 2940 versus 2V on the 78xx typical). This would allow regulation to continue down to an input of 10.5 (-10) or 9.5 (-9) volts. The 7810 will lose regulation at around 12V and the 7809 at around 11V input. Not overly important if the system is being powered from a regulated supply, but if via batteries.. Ed Yoho W6YJ
RE: [Repeater-Builder] Re: Micor UHF Repeater Base 9.6 vdc currentrequirement?
Or, how about putting old linear technology behind us, and embracing the LM2576T-ADJ switching buck regulator? You can buy this puppy ready-made for about $14: http://tinyurl.com/yhma5h5 Just change the 8200 ohm resistor to fix the output voltage. The LM2576T-ADJ is rated at 3 amperes. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Ed Yoho Sent: Friday, February 26, 2010 5:12 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Micor UHF Repeater Base 9.6 vdc currentrequirement? DCFluX wrote: In that case Just a straight 7809 or 7810 also would not require isolating the tab and can be mounted straight to the metal chassis. If it were me, I'd just use a 9 or 10 volt three terminal regulator (7809 or 7810) and skip the whole LM-317 or diodes in the ground leg deal. It only serves to make the circuitry more involved , harder to mount, and for NO advantage whatsoever. Kevin Custer Folks might consider using an LM2940-9 or LM2940-10 (or another LDO regulator) instead of the 7809 / 7810 as the dropout voltage is much lower (0.5V on the 2940 versus 2V on the 78xx typical). This would allow regulation to continue down to an input of 10.5 (-10) or 9.5 (-9) volts. The 7810 will lose regulation at around 12V and the 7809 at around 11V input. Not overly important if the system is being powered from a regulated supply, but if via batteries.. Ed Yoho W6YJ
RE: [Repeater-Builder] Re: Micor UHF Repeater Base 9.6 vdc currentrequirement?
Eric, your link doesn't work for me... (404 error) Mark - N9WYS -Original Message- From: Repeater-Builder@yahoogroups.com On Behalf Of Eric Lemmon Or, how about putting old linear technology behind us, and embracing the LM2576T-ADJ switching buck regulator? You can buy this puppy ready-made for about $14: http://tinyurl.com/yhma5h5 Just change the 8200 ohm resistor to fix the output voltage. The LM2576T-ADJ is rated at 3 amperes. 73, Eric Lemmon WB6FLY
[Repeater-Builder] Looking for Preamp info
Picked up a UHF Micor repeater yesterday, Attached to it was a Lunar PAG463 preamp. Anybody have any recollection of these or info on them? Google has come up dry. Thanks! Tom W9SRV
RE: [Repeater-Builder] Looking for Preamp info
Tom, I think they only work by the light of the silvery moon... :-p Mark - N9WYS -Original Message- From: Repeater-Builder@yahoogroups.com On Behalf Of w9srv Picked up a UHF Micor repeater yesterday, Attached to it was a Lunar PAG463 preamp. Anybody have any recollection of these or info on them? Google has come up dry. Thanks! Tom W9SRV
Re: [Repeater-Builder] Looking for Preamp info
Found this with google, Lunar product were made by Louis, KG6UH (back when he was WB6NMT). You might try contacting him directly for a schematic or manual. These are mostly from the 70s. You might try googling just Luna Preamp like I did. Mark wrote: Tom, I think they only work by the light of the silvery moon... :-p Mark - N9WYS -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com On Behalf Of w9srv Picked up a UHF Micor repeater yesterday, Attached to it was a Lunar PAG463 preamp. Anybody have any recollection of these or info on them? Google has come up dry. Thanks! Tom W9SRV
[Repeater-Builder] Re: Tram Titan III 3 Information?
was the Cb band ever on 20 and 21 mhz? i have pictures of the manual and it shows 23 channels on 20 mhz --- In Repeater-Builder@yahoogroups.com, Jim in Waco WB5OXQ wb5...@... wrote: The Tram Titan original and Titan 2 were both high ene CB radios. The 3 may also be a CB radio. - Original Message - From: Chris To: Repeater-Builder@yahoogroups.com Sent: Thursday, February 25, 2010 3:58 PM Subject: [Repeater-Builder] Tram Titan III 3 Information? I have a tram titan 3 radio that I am looking for information on. I have the manual and the radio does power on. from the manual it lists freqs. in 20 MHz. I'm looking to sell it so any information about the radio is appreciated! -- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.733 / Virus Database: 271.1.1/2710 - Release Date: 02/25/10 13:57:00
Re: [Repeater-Builder] Re: Micor UHF Repeater Base 9.6 vdc currentrequirement?
Eric Lemmon wrote: Or, how about putting old linear technology behind us, and embracing the LM2576T-ADJ switching buck regulator? You can buy this puppy ready-made for about $14: http://tinyurl.com/yhma5h5 Just change the 8200 ohm resistor to fix the output voltage. The LM2576T-ADJ is rated at 3 amperes. 73, Eric Lemmon WB6FLY I would be cautious about using a switching regulator without also providing proper EMI/RFI suppression. Without it you may cause _lots_ of grief for your site neighbors. The switching solution is much more efficient, but at a higher complexity / construction cost to do correctly and quietly. Ed Yoho W6YJ
[Repeater-Builder] Re: New to 900mhz,, PL or DPL?
Thank you for all the replies and great information. I have another question on code selection. Other than 411 being a code used for open repeater, what is the criteria for picking a DPL code. Also it looks like PL being preferred to DPL is not RFI specific as I have seen on frequency lists with PL being used in high RFI locatations. What do you think about leaving the squelch open and letting the DPL control the COR. Thanks again... The DPL list I found. Standard 83 Digital Coded Squelch Codes 0nn 1nn 2nn 3nn 4nn 5nn 6nn 7nn 023 114 205 306 411 503 606 703 025 115 223 311 412 506 612 712 026 116 226 315 413 516 624 723 031 125 243 331 423 532 627 731 032 131 244 343 431 546 631 732 043 132 245 345 432 565 632 734 047 134 251 351 445 654 743 051 143 261 364 464 662 754 054 152 263 365 465 664 065 155 265 371 466 071 156 271 072 162 073 165 074 172 174
Re: [Repeater-Builder] Re: Tram Titan III 3 Information?
In the united states Class C Class D CB were always on 26/27 MHz. Class A Class B CB was 462/467 MHz. -- Original Message -- Received: Fri, 26 Feb 2010 08:26:19 PM PST From: Chris chrismollcdx1...@yahoo.com To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Tram Titan III 3 Information? was the Cb band ever on 20 and 21 mhz? i have pictures of the manual and it shows 23 channels on 20 mhz --- In Repeater-Builder@yahoogroups.com, Jim in Waco WB5OXQ wb5...@... wrote: The Tram Titan original and Titan 2 were both high ene CB radios. The 3 may also be a CB radio. - Original Message - From: Chris To: Repeater-Builder@yahoogroups.com Sent: Thursday, February 25, 2010 3:58 PM Subject: [Repeater-Builder] Tram Titan III 3 Information? I have a tram titan 3 radio that I am looking for information on. I have the manual and the radio does power on. from the manual it lists freqs. in 20 MHz. I'm looking to sell it so any information about the radio is appreciated! -- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.733 / Virus Database: 271.1.1/2710 - Release Date: 02/25/10 13:57:00
[Repeater-Builder] LOOONG audio runs
I have a odd situation where I need to run long audio cables between my repeater controller and two repeaters. In this case, the repeater controller will be connected to 2 repeaters in the same cabinette. The other two repeaters will connected thru about 140 feet of wiring to the other side of a building. I am thinking of using balanced audio wires for the long runs and using Henry Engineeering boxes to convert between balanced/un-balanced at each end. Anyone ever done long audio runs like this? Am I over engineering it and unbalanced will be good enough? I use the Henry Engineering boxes for several audio conversions in broadcasting, here is a link for what they are: http://www.henryeng.com/matchbox.html
Re: [Repeater-Builder] LOOONG audio runs
On Fri, 26 Feb 2010, JOHN MACKEY wrote: I have a odd situation where I need to run long audio cables between my repeater controller and two repeaters. In this case, the repeater controller will be connected to 2 repeaters in the same cabinette. The other two repeaters will connected thru about 140 feet of wiring to the other side of a building. I am thinking of using balanced audio wires for the long runs and using Henry Engineeering boxes to convert between balanced/un-balanced at each end. Anyone ever done long audio runs like this? Am I over engineering it and unbalanced will be good enough? unbal to bal is a good idea. It isn't over engineering as Motorola did this for years with radio accessories. And they only had to go 17 feet. Getting rid of common-mode interference (ground loops) is worth it. -- Kris Kirby, KE4AHR Disinformation Analyst
