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Midland 13 883B Mods
- Thread starter Staybolt
- Start date
Have a look here:
www.worldwidedx.com
73
Jeff
Modding PLL UPD858 in Midland 77-883
Hey everyone I'm trying to modify a new radio. It's a Midland 77-883 AM only radio. PCB is marked as PC-152AC. It has an 858 PLL which I was really looking forward to modding until I ran into a few issues. Perhaps they're not really issues as much as confusion on my part. Here is the...
73
Jeff
Thats the 40 ch version.Have a look here:
Modding PLL UPD858 in Midland 77-883
Hey everyone I'm trying to modify a new radio. It's a Midland 77-883 AM only radio. PCB is marked as PC-152AC. It has an 858 PLL which I was really looking forward to modding until I ran into a few issues. Perhaps they're not really issues as much as confusion on my part. Here is the...
73
Jeff
Opps, did not catch the "b"
Maybe we can bump that thread and get some help from guys way smarter than me.
73
Jeff
Maybe we can bump that thread and get some help from guys way smarter than me.
73
Jeff
So it is Crystal controlled?
www.worldwidedx.com
If it is like the 895 you have to add a crystal.
73
Jeff
Midland 13-880B channel mod?
Anyone mod a 13-880B for channels that would include channel 38? I haven't found anything in searching but may have missed it. I am certain it would require an added crystal to be switched for a different set of channels but that is about all I know about it. Nice old radio but not too useful...
73
Jeff
No idea if this particular modification works or not:
It's mucking around with what looks like the right pins to get you higher.
To really figure it out you'll need to create a truth chart of the channels that are available now and then extrapolate that to find the channels you want. You could start with the one in Sam's CB-142, but then you'll need to fill in some blanks as that doesn't include the pins that hardwired high or low.
You could also change the PLL loop downmix frequency, but you'll need a crystal and oscillator circuit to do that. A 15.64 MHz crystal should get you 24-51, minus existing channel skips. Changing the frequency doesn't change the wiring on the channel selector so those will still be there.
Or you could get one of those three digit BCD thumbwheels and program the N-codes into the PLL directly.
Another option would be putting in a microcontroller and controlling the radio from a computer. But that's custom programming and not very portable if you want to run this in your car.
So perhaps the problem isn't a lack of mods, it's a plethora of them.
It's mucking around with what looks like the right pins to get you higher.
To really figure it out you'll need to create a truth chart of the channels that are available now and then extrapolate that to find the channels you want. You could start with the one in Sam's CB-142, but then you'll need to fill in some blanks as that doesn't include the pins that hardwired high or low.
You could also change the PLL loop downmix frequency, but you'll need a crystal and oscillator circuit to do that. A 15.64 MHz crystal should get you 24-51, minus existing channel skips. Changing the frequency doesn't change the wiring on the channel selector so those will still be there.
Or you could get one of those three digit BCD thumbwheels and program the N-codes into the PLL directly.
Another option would be putting in a microcontroller and controlling the radio from a computer. But that's custom programming and not very portable if you want to run this in your car.
So perhaps the problem isn't a lack of mods, it's a plethora of them.
It is the B model, which uses the 858 pll. I did manage to mod it but all i get are lowers.