Uniden Bearcat 980 SSB NPC or swing mod help

[711]

The standard variable deadkey mod like the ones used on all transformer modulated radios. Works awesome and sounds very good due to the lower deadkey.

 

[Loyal Servant]

Probably not nice to necro a two week old thread but there is some interesting stuff brewing with this radio:
http://www.areciboinstruments.com/SSB980.aspx

 

[Sarasota Slim]

Hmm. Well, that's interesting.

Assuming that guy DOES open source his findings, that would be cool. Not that I'd be inclined to play with it, myself (seems a little overly complicated), but it will make fun projects for others, who are so inclined.

 

[711]

Radio is darlington modulated, like a 148. Havent found the BM yet. NPC will most likely be a diode/resistor combo and not the heavy swinger version either. Modulator is extremely sensitive so too much audio drive pushes it into extreme overmodulation.

 

[Tim Chambers]

I got my hands on this radio, untouched. My main concern right now is doing an NPC mod or swing mod (witch ever this radio takes). The fact that this radio is SMT based parts is not an issue, I do have the proper equipment to do what I need to do with SMD. The only thing I could find on getting this radio swinging with a low dead key was one video on YouTube. Variable power would be nice but I'd be happy with a lower dead key and swinging to max power. Any help would be very very helpful. Thank you!

Shoot me an email and I'll walk you through the mod for the 980 SSB

 

[Tim Chambers]

1n4148, cathode 2 center leg of am regulator, rearmost three-legged chip heatsink on the chassis.

Shoot me an email and I'll walk you through the mod for the 980 SSB

1 in 4148 signal diode, cathode to center leg of a m regulator which is the rearmost three-leg IC heatsink to the chassis. Add a 47 ohm 1/2 watt resistor in series to the anode, solder other end of resistor to positive leg of c26. Make sure to use shrink tubing. Opens up the swing quite nicely

 

[Shadetree Mechanic]

1n4148, cathode 2 center leg of am regulator, rearmost three-legged chip heatsink on the chassis.

1 in 4148 signal diode, cathode to center leg of a m regulator which is the rearmost three-leg IC heatsink to the chassis. Add a 47 ohm 1/2 watt resistor in series to the anode, solder other end of resistor to positive leg of c26. Make sure to use shrink tubing. Opens up the swing quite nicely

Thanks for sharing these mods, I am going to get another 980 to play with.

 

[Tim Chambers]

Thanks for sharing these mods, I am going to get another 980 to play with.

You bet. I have picked up a lot of bits and pieces of information from this forum and another one and thought I would share some knowledge I've gained with everyone. Shoot me a call if you want a quick walk-through. I'm listed under tiny's CB shop. Happy modulating!

 

[sonoma]

there is a guy by the name of chuck that sells a pretty impressive mod for the 980. at least it looks good on his videos.

 

[sonoma]

here is the mod I was telling you about.

https://www.ebay.com/itm/SUPER-MOD-...361543&hash=item46ab780102:g:yeIAAOSwX6JdCplZ

 

[Shadetree Mechanic]

Looks like 4 or 5 wires. Its round like some kind of capacitor. Might have some kind of regulator inside.

 

[711]

Probably nothing more than an NPC mod. I’d buy it just to debunk . I did an NPC and a direct inject on my 980

 

[Big Kahuna]

I remember seeing the channel king expansion board for the 980, wondered what ever happened to that project?

 

[Tim Chambers]

Don't ever buy anything that has the components hidden in epoxy or such, more than likely you're buying snake oil, all of the wires but two probably are not hooked up to anything inside the goop. put the diode and resistor in for your swing mod and you will be more than happy. If you want to have an even cleaner signal increase the resistance up to a hundred ohms.

 

[Harley3315]

Don't ever buy anything that has the components hidden in epoxy or such, more than likely you're buying snake oil, all of the wires but two probably are not hooked up to anything inside the goop. put the diode and resistor in for your swing mod and you will be more than happy. If you want to have an even cleaner signal increase the resistance up to a hundred ohms.

I was reading some where that someone added channels using crystals any more info on that around I just want to add the lower 40 for am use not sure where to start the crystals in my 880 weren't marked I'm assuming the 980 will be the same