Warren discussed this in detail. TX IMD are quite bad, however it does not sound bad at all. Keep in mind it splatters if you shout into the mike. I will try the VOGAD add on, at least it should deliver an almost constant mic input.
Il 03/dic/2018 06:27, "Wayne Leake" <
wayneleake@...> ha scritto:
?I notice that nobody mentions the best way to check an SSB outgoing signal.
?You need a good two tone audio signal generator. Along with a wide band scope, check that you see a good sine wave pattern.
?We had a setup for testing SSB CB Radios that did just this, so we could see how good the pattern was,
?The setup also checked an AM signal modulated with a single tone.
?You wanted a nice even sine wave. No flat topping, which meant over modulation, and modulation to a bit under where it would start to flat top
?this gave you the cleanest signal.
?Even on ham frequencies, you want the same results
?Make sure that the audio signals are a nice clean sine wave.
?Mixed with a nice clean signal on AM.
?I would say best to check the carrier on AM, as well as the audio sine waves for a nice clean sine wave.
?A square wave is not what you want to use for these tests.
?Wayne WA2YNE
On Sun, Dec 2, 2018 at 5:29 PM Mark McNabb <
n7eku@...> wrote:
Hi Simon,
I don't think this is true.? What is true with homebrew, is that the device doesn't not have to be tested by the FCC; the spectral requirements are still the same, but it is up the the user to figure out how to meet them.? That is where the "test, training, education, etc." comes into play!
73,
Mark.
