robismyname
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biff44 said:you will see a staircase pattern on the scope.
biff44 said:it helps a lot if you can hook up to the unit directly to get a good trigger.
biff44 said:I mean, if you have access to the inside of the radio to figure out when a new frequency hop is about to occur, you could trigger off of that digital signal.
biff44 said:you can use a mixer in place of the phase detector.
biff44 said:you can use a mixer in place of the phase detector.
robismyname said:biff44 said:you will see a staircase pattern on the scope.
Should it look like this?
biff44 said:so it will be a little hard to figure out the exact frequency centers, but you have the idea now.
biff44 said:IF there was some way to turn off the modulation, you would get a cleaner scope picture.
biff44 said:If you have access to a CW synthesizer, you can calibrate the frequency discriminator output voltage vs. input frequency.
biff44 said:If it looks like the delay line length is right, but you do not get a monotonic "line" but a single hump, add or subtract small lengths of coax line to recenter the discrimator output.
Mazz said:Monitor the SPI of synth and decode its commands to check programmed freq vs. time.
Mazz
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