Top Gun CP-1 Undressed

[711]

Not what I thought it was but performs the same action as I suspected

 

[buickid]

For the less technically inclined, what is it doing?

 

[Robb]

Nice!
Too bad there isn't an undressed TG-1 (Top Gun) module.
IIRC, they were the only company to make a true asymmetric modulation circuit that worked!

 

[TheRealPorkchop]

I too would like to see that.

 

[711]

Nice!
Too bad there isn't an undressed TG-1 (Top Gun) module.
IIRC, they were the only company to make a true asymmetric modulation circuit that worked!

The MD-1 has been talked about and covered. Works like an automatic(AGC) heavy swinger NPC mod.

 

[711]

For the less technically inclined, what is it doing?

What I initially thought the CP-1 did was very similar to the way the K40 mic processor did. The K40 processor has a pair of diode flipped with a resistor and cap all in parallel in the feedback loop of an opamp. It’s a clipper/limiter that when pushed hard starts to distort and some of the guitar guys used this clipper arrangement to add fuzz/distortion to their guitar sound. Anyhow, since the CP1 has you remove the feedback resistor and add their circuit it is fundamentally a clipper similar to the K40

 

[bob85]

I think the later k40 schematic is not correct,

if you carefully put the tone switch between high & low it disconnects the capacitors & resistor leaving only the back to back diodes & you get a setting that's louder with a more full range sound,

that can't happen the way its shown in the schematic above,
the original schematic had the switch on the opposite side of the capacitors wired correctly,

to fix the schematic above remove the link between switch common & high tone.

 

[711]

I need to pull values but I thought it would've been a back to back layout and not like a diode string. Diodes in the feedback path of the opamp is considered soft clipping.

 

[711]

Values were different but nice to know the diode make up. Forward voltage is 0.255v and forward bias was 82k reverse bias 19M. Added a switch to bypass.

 

[Shadetree Mechanic]

Cp-1 bump, does this thing make a difference that can be heard? Might put one in my 94hp

 

[711]

Cp-1 bump, does this thing make a difference that can be heard? Might put one in my 94hp

2950 Top Gun CP-1 Compressor

Been wanting to do a before and after for a while now. Did the NPC to the radio adjusted the resistor for 90-100% negative modulation and limiter in tact. Audio generator was kept the same through the videos till the last video. Second video was taken with R171 removed (limiter circuit). Last...

www.worldwidedx.com

I say better to play with feedback resistor and cap values

 

[Onelasttime]

We still know nothing that is objective we have assumptions and idea's but nothing that would stand up in court or at community college as a fact!

 

[secret squirrel]

I had one of the small K40 radios, that had the speech processor unit on the radio board not contained in the microphone. Dave at DTB had tuned everything for me and I was pleased with the results. I had used it for a few years at my main mobile radio. RIP- to the big CB junk pile in the sky. Bob Fitzpatrick, from Bob's CB had installed an MD-1 in my Texas Ranger 696 FD1, and tuned everything accordingly. Bob treated it like an NPC mod and left it run all the time. This was a rare day that Bob was not piled up with work, he instructed that adding the CP-1 at the time would be waste of money if I did not talk regularly on SSB, as its performance would be most noticed on SSB. It's assuming to look back at the progression of our radios in this hobby. Currently my Texas Ranger 696 FD-1 has been pretty much returned to stock, except for the upgraded MOSFET final that Bob had added. Come to think about, most all my radios in the collection are stock, and have a stock 3.5 or 4 watt DK switching to whatever. I remember the MD-1 and CP-1 being placed on switches in the Magnum Radios.