Thanks for this video. I just aligned my R7000 using your video and went well. It was a big help understanding things. I used a near field probe with my spectrum analyzer to measure the 1 GHZ frequency and that was a lot easier then trying to get a a cable on the tiny capacitor point.
I had left you a comment about the LSB/USB switch location on the back of the radio on the repair video. I have one of these radios and found the upper / lower sIdeband switch on the back to be in a very odd place. Thanks for this video.
The BPF tuning voltages are derived from the PLL tuning voltages. The opamps modify the voltages sent to the BPF to compensate for the IF shift, this is the function of those potentiometer adjustments. Any great discrepancy with the BPF voltages indicate a misadjustment with the PLL for that frequency band, and should be visited first.... Fortunately, the BPFs are very wide band and not very critical with the varicap tuning voltages, but it is nice to know they are correct.
How are you, sir? I have a question for you. Do you specialize in network engineering? Do you offer educational courses? Thank you for your wonderful effort
Keep up the great videos, many of us appreciate them. Lots of learning happens no matter what the work is you are doing.
Thanks for this video. I just aligned my R7000 using your video and went well. It was a big help understanding things. I used a near field probe with my spectrum analyzer to measure the 1 GHZ frequency and that was a lot easier then trying to get a a cable on the tiny capacitor point.
I had left you a comment about the LSB/USB switch location on the back of the radio on the repair video. I have one of these radios and found the upper / lower sIdeband switch on the back to be in a very odd place. Thanks for this video.
As is, the switch to change the FM bandwidths
please more videos on repair and alinement of HF radios found very intesting
The BPF tuning voltages are derived from the PLL tuning voltages. The opamps modify the voltages sent to the BPF to compensate for the IF shift, this is the function of those potentiometer adjustments. Any great discrepancy with the BPF voltages indicate a misadjustment with the PLL for that frequency band, and should be visited first....
Fortunately, the BPFs are very wide band and not very critical with the varicap tuning voltages, but it is nice to know they are correct.
Nice 😊😊
How are you, sir? I have a question for you. Do you specialize in network engineering? Do you offer educational courses? Thank you for your wonderful effort