It is the signal divide by N input to the phase detector, and should be a positive going pulse, about 1. It is a minor annoyance, and appears every 5 kHz across the band. Based on about 3 boards, the Q VCO's are tuning at or very near their their highest frequency. First setup the following parameters to make sure that my radio and yours are measuring the same things: If either is out of lock it will be red. If it is close to 0 or to 5 Volts there is a problem. The basic tuneup is in October QST magazine and should be read first. 
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COM for the various diagnostics programs with another batch file. You should go to min L by putting the slug into the core. In order make these work, it should only be necessary to put the voltage-tuned oscillator Exxe on frequency. U is programmed along with the two shift registers, U and U It is built on a scrap of PC board.
DSP from W7PUA - Measurements
If it is close to 0 or to 5 Volts there sxe a problem. At the top is U which is the reference input.
They can be bent to fit the spot being probed, as it is important to get a good short ground connection. And, there are no software limits to the dial frequency. Remember, this is the result of measuring one working unit.
DSP from W7PUA - PLL Diagnostics
You're right, this makes it impossible to tell them from DOS. This waveform is the lock detect for U at U U is available at the IC. It is the reference input to the phase detector, and should be a positive going pulse, about nS wide, repeating every microseconds times per second.
There is a very brief flicker of the red LED at the end of the 5 seconds, during the time that the two PLL's are achieving lock. Preliminaries First, we need to have the board in a known state.
Texte d'origine
You must have either a 10 MHz crystal in place and a jumper between P and P the side toward the crystal, or be running an external 10 MHz reference to P and P ground. Check the VCO frequency, if you have some method of receiving that frequency. Details on the 'Bit-Grabber' programming is in the data sheet for the MC In order to simplify the procedure a special program is available that does only the PLL exee.
An update as of 4 Dec This is about the same distance as going across a chip capacitor. They share the data and clock lines, but have separate enable lines. The noise did drop, though. Read through them and use them as an aid. Max L lowest frequency is when the slug is flush with the top of the can. The measurements were made by probing across some small components.
If you have something that tunes Based on exs 3 boards, the Q VCO's are tuning at or very near their their highest frequency.
Zero volts is 1 division from the bottom on all 4 pixwhere the little black marks are on the sides. It is little easier to see, being about 50 nsec wide. But, first some construction details, so that your probe and mine could be as similar as possible.
Also, if you calculate the apparent power in these traces, it is quite a bit below 7 dBm.
You should see the average Voltage of about 2. Also, measurements like 6 or 9 mV are close to the conduction point of the silicon diode in the probe, and therefore prone to greater errors than the higher Voltages. Both of these occur every 50 microseconds.
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