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Uniden Bearcat 980 SSB NPC or swing mod help

711

Well-Known Member
Mar 22, 2008
324
360
73
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.
 

Sarasota Slim

Well-Known Member
Nov 18, 2016
238
158
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Earth, normally
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

Well-Known Member
Mar 22, 2008
324
360
73
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

Member
Apr 9, 2017
28
63
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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

Member
Apr 9, 2017
28
63
23
56
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 :)
 

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Shadetree Mechanic

808 On The North Side of Dover
Oct 23, 2017
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The First State (Delaware)
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.
 

sonoma

Sr. Member
Sep 14, 2005
2,105
935
123
oklahoma
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.
 

711

Well-Known Member
Mar 22, 2008
324
360
73
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
 

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Big Kahuna

Sr. Member
Jul 31, 2008
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I remember seeing the channel king expansion board for the 980, wondered what ever happened to that project?
 

Tim Chambers

Member
Apr 9, 2017
28
63
23
56
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

Active Member
Oct 22, 2015
178
18
48
40
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
 

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