Low channel mod for UPD-2816

[tecnicoloco]

Thanks for the info Technicolo. I checked out the site and I think I'm going to get one to try out.

Hi: Lesscom boards for 2824 or 2816 are almost 3 times as much as 1 from Ing Maurer,he ships from Austria

Or if you lucky to finds these on ebay or amazon

https://cbworldinformer.org/cb_world_961001_2.htm

 

[AudioShockwav]

It's a spammer begging for subscribers.
@Giffin put schematic with description here or don't bother us.

He is no longer a member here.

 

[Smokinone]

I found a few of these SPECTOR SP-41 kits in some of my inherited stuff. I think it's close to the Galaxy kits for 29 etc.
Not sure if it's relevant here or not, it does have upper and lower setups, the chips are shaved on them.
There's a list of radio applications on the .pdf.

 

[TM86]

I found a few of these SPECTOR SP-41 kits in some of my inherited stuff. I think it's close to the Galaxy kits for 29 etc.
Not sure if it's relevant here or not, it does have upper and lower setups, the chips are shaved on them.
There's a list of radio applications on the .pdf.

View attachment 66928

While I can't prove anything, the physical layout of that "Spector SP-41" kit looks about like what you'd expect from the diagram in the link Techniloco posted. Frequency coverage appears to be identical as well. Odds are that it's the same circuit, so the chips would be a 7493 4-bit counter and a 7400 quad NAND gate. Both of which are still available. So they went and shaved them for nothing.

 

[Smokinone]

While I can't prove anything, the physical layout of that "Spector SP-41" kit looks about like what you'd expect from the diagram in the link Techniloco posted. Frequency coverage appears to be identical as well. Odds are that it's the same circuit, so the chips would be a 7493 4-bit counter and a 7400 quad NAND gate. Both of which are still available. So they went and shaved them for nothing.

These kits are probably over 25 plus years old, back when it was a secret.

 

[Smokinone]

I found a few of these SPECTOR SP-41 kits in some of my inherited stuff. I think it's close to the Galaxy kits for 29 etc.
Not sure if it's relevant here or not, it does have upper and lower setups, the chips are shaved on them.
There's a list of radio applications on the .pdf.

View attachment 66928

I have 3 of these. If someone wants to try one, it would be the cost of shipping.

 

[nomadradio]

I remember installing a few of these back in the 1980s. The tripler coil's setting becomes both touchy and critical. Found that the temperature swings in a mobile installation would mess with the tripler settings just enough to cause intermittent trouble. Base station users didn't seem to have this problem.

Never got around to trying to analyze just what it's doing back when the numbers were scraped off the chips. Still don't have the picture of exactly what changes it is making to the PLL.

73