You can hear the difference. With all of the talk about audio quality on this site it would seem apparent the benefits of a properly modulated signal. It does punch through the noise and jabber on the frequency.
And yes it is a true asymmetrical modulation.
Very good, I guess what I'm trying to say with this thread is that people can often attempt to make the radio perform in such a manner and fall short of a clean signal.
I have seen many Cobras set up with a super modulation kit look very poor on the oscilloscope, some of the export radios I have seen have a quality signal, that is apparently asymmetrical, & they produce good loud audio.
BUT! Most of them I come across are setup like "swing kits" and look poor on the scope. In my opinion the modification is done incorrectly if the carrier gets piched, or the pos. peaks flat-top/distort at all, REGARDLESS of how the radio sounds on air!
That same Galaxy radio set up incorrectly, would perform like an incorrectly set up Cobra.. (distortion/flat topping/negs crash/pinched carrier)
That is why I say there is a difference between a swing kit and an NPC.
Tallman's radio is likely very clean (while producing moderate "swing"), I would go as far as to say that I have a Galaxy DX66V that can be made to operate in a very similar fashion.
[ I believe I've recreated the results found by using one of the Magnum modules in an export, just by goofing around & I'm no 'real' scientist after all.]
It all comes down to who's operating the radio, what the radio is capable of, & the the tune/configuration.
Some people can produce a clean asymmetrical waveform, while others can only produce shark teeth with this mod and we're talking about the same radio,
perhaps even the "2 seperate modifications" actually occur in the same circuit.
(one with poor results in my opinion, and the other producing an apparently clean & asymmetrical waveform)
Hell, the same value components can produce nasty results if the radio is not setup correctly!
But with enough patience, you eventually figure out how to dummy proof the radio (in component value selection and trimmer pot adjustment) so that it does not "over modulate" (the negs
) no matter where the microphone gain is.
That is the only kind of "loud as hell" radio I would ever dream of running, the typical swing kit results that I see on the average transformer modulated Cobra mobile radio looks like absolute garbage and would never be worth running no matter how the radio sounded on air.
Time for me to get a spectrum analyzer because this story only goes deeper!
Not only in regards to the export radios with modifications, but the Uniden NPC mod may have a serious fault as well.
Captain Kilowatt, Unit_399, ExitThirteen, Loosecannon, & other prominent members have recently discussed in an older thread, that there may be problems associated with "harmonic distortion" ? (I forget the term) not normally noticed with the spectrum analyzer unless specifically tested for, when using the NPC mod.
This kind of blew my mind a little bit, because I was really excited about the idea of clean asymmetrical modulation from a modified c.b. radio!
The only thing that I can demonstrate at this point, is clean modulation on the oscilloscope; I lack further test equipment.
(It's probably not as easy, as simply adding a diode
)
I'll have to find the link for this thread, if you find the thread before me please link it here.
I associate the term "swing kit" with "splatter box", while a proper npc modified radio does not have to be so "RF McNasty"; I don't care for ghost watts.
...Mean is Clean, do the best that you can! 73
