Yes, I know it. May even be the device I was referring to. My recall, the healthiest RF PA device in a plain T0-220 package heat sink required.
2SC2312 was Mitsubishi they used in the 1000M
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HELP with Pace Sidetalk 1000B 40ch with PTBM048A0X / PLL02A
- Thread starter FarmerChris
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2SC2312 was Mitsubishi they used in the 1000M
Nope. A '66 Cadillac CDV with 4 antennas. Looked like a porcupine. If you saw it, you would remember it.
That was 46yrs ago and although I never forget an antenna, the caddie is a little fuzzy. Do you remember Leonard with the jacket or the guy with a Honda hatchback that blasted the parking lot with his huge speakers at break and lunchtime? How bout the old security guard at the main with the wrinkled face, forget his name but I should have a picture of him somewhere. How bout the lunch truck husband and wife team that made dynamite home made lemon meringue pies? How bout the great big 450lb guy that used to steal food off the lunch truck and the grease stained apron that he used to stick the stolen chicken wings in? Richard Blackburn, that was his name, I sold that guy a 35mm camera and he was later arrested for taking pictures of little neighborhood kids in a way that would get you arrested.....
Maybe we need an old Pathcom employees thread. Anyway its interesting to have two ex employees commenting about the Pace 1000B. I recently went through my library and tossed out tons of old Pace manuals and schematics, I think there was a 1000B manual in the pile.
Maybe we need an old Pathcom employees thread. Anyway its interesting to have two ex employees commenting about the Pace 1000B. I recently went through my library and tossed out tons of old Pace manuals and schematics, I think there was a 1000B manual in the pile.
The AM/SSB receive base station I mentioned earlier had a custom 25 or 30W VHF final die from a stud mount package put in a TO-220 case for the radio. I believe it was a Motorola part and not a 2SC type. Not sure if the radio I have has that version but I could get the numbers off the transistors.
My Pace 1000B had a 2SC1307 final and a 2SC1306 driver and I still have NOS spares from 1976.
My Pace 1000B had a 2SC1307 final and a 2SC1306 driver and I still have NOS spares from 1976.
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I do remember Gene Proctor and Laslo. Not much else in people. My cage was right off the assembly stations and those laid out for a couple products.
About all I recall is the 1000m was assembled in the same building. What boards or sub assemblies were imported, I dont know.
These had the PLL board, the Kokusai SSB filters, I think were the best. A push pull class B AM modulator. A mitsubishi 2SC2312 final, good for about 18 watts PEP
The boards were not completely stuffed, I had to choose the bias resistors for the AM modulator and install those.
I had to choose the driver bias resistor so the last two gain stages were class AB-1 (linear)
Then had to balance the SSB modulator and adjust the gain and APC. Specs called for < 24 watt input.
RF output peaking and the radio went back to assembly for the case and cosmetics.
I worked there to 11 months when the CEO called employees to that large lunch room, given a letter of recommendation, severance bonus, and a handshake. I asked about migrating to the marine radio division but no luck. the only bad day there I will remember.
I do know shortly after that, the marine radio division was sold to Regency. later closed everything.
Oh yea, I was 6'2", good eyesight and fair hearing then.
About all I recall is the 1000m was assembled in the same building. What boards or sub assemblies were imported, I dont know.
These had the PLL board, the Kokusai SSB filters, I think were the best. A push pull class B AM modulator. A mitsubishi 2SC2312 final, good for about 18 watts PEP
The boards were not completely stuffed, I had to choose the bias resistors for the AM modulator and install those.
I had to choose the driver bias resistor so the last two gain stages were class AB-1 (linear)
Then had to balance the SSB modulator and adjust the gain and APC. Specs called for < 24 watt input.
RF output peaking and the radio went back to assembly for the case and cosmetics.
I worked there to 11 months when the CEO called employees to that large lunch room, given a letter of recommendation, severance bonus, and a handshake. I asked about migrating to the marine radio division but no luck. the only bad day there I will remember.
I do know shortly after that, the marine radio division was sold to Regency. later closed everything.
Oh yea, I was 6'2", good eyesight and fair hearing then.
You must have been there after I left as the 1000B and M were totally imported radios and no US assembly of anything like that. They were ramping up for 40 channels by modifying channel selectors in some digital synthesized radios and we were getting shipments of imported 40 channel radios in but they couldn't be sold until the legal date for 40 channels and I left the company right before that. I do remember seeing the first 40ch version of the 1000B and that I could not simply get a 40 channel selector as my radio was crystal and not digital synth.
I started in the building that housed some US assembly and alignment like for the 2300 series and we later moved up the street during some massive expansion project. One of the people that originally trained me fits your description but he was there long before I started around fall of 1975. I left maybe fall of 1976.
I'll start a new thread called "Ex Pace/Pathcom employee stories" and we can continue there.
I started in the building that housed some US assembly and alignment like for the 2300 series and we later moved up the street during some massive expansion project. One of the people that originally trained me fits your description but he was there long before I started around fall of 1975. I left maybe fall of 1976.
I'll start a new thread called "Ex Pace/Pathcom employee stories" and we can continue there.
Actually, I recall the roach coach well and the old guard at the gate. I usually did the dining hall, I was on egg salad sandwich and burrito binge then. My recall for names has always been terrible. My caddy was black vinyl over a light beige. Fold over hustler with super coil on rear fender.
A UHF Motorola 5 Db, AS M-125, and AS VHF base load in line on the roof.
I think I remember where I put that CB mods book, if there, it will be enlightening.
We loved our Pace 2300s growing up. It was the only mobile we wanted to use. Our Base was a Johnson 223.
FarmerChris
Member
Hi again @prcguy, I fiddled doing some testing and I have to replace my final. I bought 6 NOS 1969'S, I was going to use one as final, do you think I could also put one in driver as well? The transistors are inside a fortress of heat sink lol, I think I added the photo in a previous post in this thread...
I would use whatever was the original driver type. My 1000B had a 2SC1306 and 2SC1307.
If you had hammie antennas, especially a Motorola 5dB you probably caught the attention of "Wild Bill" Cody. Remember him?
FarmerChris
Member
So the circuit is not getting 12v, but the transistors tested good. My friend doing the repairs will test out the circuit to see what blew when I tested wrong with the multimeter.
As an aside, he thinks the ptbm048 board was put in afterwards (or perhaps one of the rarer 40ch 1000b versions) as it doesn't match up along the edges, as well as blocking the original antenna mount location.
Also, I did pick up a mint 23ch 1000b for cheap, I was going to use the finals in there to swap out, but it looks like I won't need to. The 23ch version looks pretty stock...aside from a 4 pin different mic hook up...
My buddy has both he will test the 23 with proper mic and fix the 40ch.
Cheers!
I do remember some of the 23ch radios that were in stock during the announcement of 40ch but before the legal date to sell them were modified by Pace at the Harbor City, CA plant. Maybe your radio is one of the early 40ch versions that got modified. I had a side conversation with merlin who worked there a little after I left and he says some 1000Bs were shipped to CA in a kit form and final assy and alignment was done in CA and this would have been after the 40ch rollout.
I may have mentioned this but one of the best mics I had on my 1000B was the 1970s Shure 526T. I may have also had a Turner Super Sidekick and/or Turner +3 base mic on it also. All of them sound great but the 526T was the best.
I may have mentioned this but one of the best mics I had on my 1000B was the 1970s Shure 526T. I may have also had a Turner Super Sidekick and/or Turner +3 base mic on it also. All of them sound great but the 526T was the best.
FarmerChris
Member
Hi super info.
My friend fixed the 40ch 1000b, it was simply burnt etch in the circuit, cause d by me mis placing the multimeter.
Quick fix- for him anyway...lol
I'm getting both back.
I will test out frequencies and clarifier on the 23ch version.
Then I'll probably open the clarifier and possibly add channels.
Any tips on how to get more channels via dpdt switch? Or switching crystal to get 38 range?
I heard the wiggle technique could access extra channels as well, I will try that, as well as opening 22a.
I use an astatic 878 on the 40ch version. I heard my friend on it and it sounds good both without and with the CBS DSP.
The 23ch has different wiring, my friend hooked up a cheap mic for now, I'm looking for a medium priced amplified mic for it, preferably hand, I'll look into your top picks...
Cheers...
On many radios there was a small jumper on the ch selector switch and cutting that enabled ch24 or the old 22A. To get more channels in the 23ch version you need to switch in another crystal. I had a slide switch on the back with short leads to disconnect the original crystal and switch in a new one or maybe two that added most of the new channels between 24 and 40. I don't have info on the crystal freq since it was so long ago.
I just purchased a Pace Sidetalk 1000B, and I'm happy with it, I was hoping you could tell me what finals and or drivers are in it, I'm wanting to replace them as it gets a little warm. And was thinking this might be the cause of it, is it possible to convert my 23ch to a 40ch?.. I'm in Australia... Cheers
Its been about 45yrs since I owned one and it was purchased about 47yrs ago, so my memory is fading. I think they all get a little warm if you transmit a lot and if the power out is within spec about 4w AM and 12w SSB the driver and final transistor are probably ok. If the final bias is too high it will draw excessive current and heat up faster but I don't remember if there are any adjustments for that. Parts can change tolerance over 45yrs. Is it just the transistors that are getting hot or the back of the radio? If the transistors are getting a lot hotter than the case then maybe the heatsink paste and insulator have degraded over time.
Mine was a very early 23ch and had a crystal synthesizer which cannot be upgraded to 40ch. I did put a switch in mine that would select two other crystals to give more channels above 23 and this was well before 40ch were announced. If you have a schematic diagram with crystal freqs you should be able to figure out what frequency crystals would add more channels. I sort of remember replacing a crystal gave you four extra channels and I set it up so ch 1-8 were my extra channels.
I think mine had a 2SC1306 driver and a 2SC1307 final and later radios had different transistors and a digital synthesizer in the 40ch radios. I worked at the Pace factory right before the switch to 40 channels and I remember the digital synthesizer came out in the late version 23ch and we replaced the channel selector switches on all the 23ch units to be sold as 40ch radios. If you happen to have a digital synth 23ch version you could just replace the switch but good luck finding one now.
Mine was a very early 23ch and had a crystal synthesizer which cannot be upgraded to 40ch. I did put a switch in mine that would select two other crystals to give more channels above 23 and this was well before 40ch were announced. If you have a schematic diagram with crystal freqs you should be able to figure out what frequency crystals would add more channels. I sort of remember replacing a crystal gave you four extra channels and I set it up so ch 1-8 were my extra channels.
I think mine had a 2SC1306 driver and a 2SC1307 final and later radios had different transistors and a digital synthesizer in the 40ch radios. I worked at the Pace factory right before the switch to 40 channels and I remember the digital synthesizer came out in the late version 23ch and we replaced the channel selector switches on all the 23ch units to be sold as 40ch radios. If you happen to have a digital synth 23ch version you could just replace the switch but good luck finding one now.
Thank you so much for your detailed reply, it got quite warm on the case at the rear, but I was doing a bit of transmitting, I've noticed it has a tendency to lose power as you transmit, if you transmit longer than 8-10 seconds, the RF meter starts to decrease and even the lights start to dim, once you stop transmitting the lights brighten and transmit power goes back to normal, what would cause this to happen?, I do plan on having the capacitors replaced, I'm a novice when it comes to Radios, so I will be getting my tech to do it.. I will remove the cover and take some photos to find out if it's the early or later version... Thanks again.
If you can borrow a thermal camera look at the driver and final to see if they are a lot hotter than the nearby back panel surfaces. I would transmit for about 30 seconds then watch the temps and the transistor cases and back panel should equalize rapidly when you stop transmitting. If not the thermal junction is probably bad and I would first tighten the heatsinking screws and try again then clean and replace the heatsink paste if the transistors are still noticeably hotter than the case. At some point the power can drop off when the transistors get really hot. I would also monitor the power supply voltage to see if its well regulated, a drop in voltage will also lower transmit power.
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