Channel off

[redlght]

On a 2000 what would make the channels unable to be set right on the money 1 to 22 or so off by one digit like 20 = 27.2049 when you get to the change over channel it will bounce between right on and one off but 23 to 40 = 27.4050 right on the money in rec, and can rx only be adjusted without changing tx also so far i can not seem to do it.

[TheCBDoctor]

On a 2000 what would make the channels unable to be set right on the money 1 to 22 or so off by one digit like 20 = 27.2049 when you get to the change over channel it will bounce between right on and one off but 23 to 40 = 27.4050 right on the money in rec, and can rx only be adjusted without changing tx also so far i can not seem to do it.

Hi redlight,

I wouldn't sweat being off my 50 hertz. There can be a number of reasons your radio is doing this. In theory if the radio is on frequency on channel 40, then it should be on frequency on any of the other channels with a radio using a PLL. Of course Crystal radios are a different story.

If your Voice-Lock is locked (Factory) then go to VR-5 at the front of the radio and split the difference. It may be touchy, in which case use a 5K or even a 10K pot to replace the 3K pot (VR-5). If the voice-lock is unlocked then VR-5 is disabled. It may be the counter that is giving you a false reading, even then, I would not worry about 50 hertz. Sideband is critical, but that is what the Clarifier (Voice-Lock) on the receiving station is for.

I never sweat the details. If you can be heard, then that separates you from the Herd.

Respectfully as always,

[redlght]

Aww i so wanted to be right on guess no milk and cookies for me either huh? LOL... Ok doc so just be happy with it huh,,,, sulks... ok i guess i will digress.

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Tuesday, 28 May 2013, 11:08 AM

Decided to unlock the clarifier and I wanted a switch inside to flip to lock it again don't ask why lol I am just AR that way at any rate I went to trace the yellow wire to the board from the coarse side and it was not there so I tracked it from the board side here it was cut and hidden in the bundle, Why would any one only cut the yellow wire from it? So now it looks like I need to realign the whole thing it is off now, Think that was my prob in the first place? PeAcE

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Tuesday, 28 May 2013, 14:18 PM

Nope wasn't the problem. I must of bought the cleanest looking worst working radio cobra ever made. Trade for a sparkomatic?

[TheCBDoctor]

Aww i so wanted to be right on guess no milk and cookies for me either huh? LOL... Ok doc so just be happy with it huh,,,, sulks... ok i guess i will digress.

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Tuesday, 28 May 2013, 11:08 AM

Decided to unlock the clarifier and I wanted a switch inside to flip to lock it again don't ask why lol I am just AR that way at any rate I went to trace the yellow wire to the board from the coarse side and it was not there so I tracked it from the board side here it was cut and hidden in the bundle, Why would any one only cut the yellow wire from it? So now it looks like I need to realign the whole thing it is off now, Think that was my prob in the first place? PeAcE

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Tuesday, 28 May 2013, 14:18 PM

Nope wasn't the problem. I must of bought the cleanest looking worst working radio cobra ever made. Trade for a sparkomatic?

Hi redlght

I understand about AR. My equipment was always dead-to-nuts until I realized that somethings we simply don't have control over. That yellow wire goes to R175, which is a 2.2K ohm resistor that goes to ground. Its purpose is to set up a proper voltage dividing network. Without the course setting having a referenced ground the voltage dividing network cannot be balanced.

I am surprised it worked and I would have suggested putting the yellow wire back to cure your minor issue. I am surprised it didn't fix the problem. I am not surprised that someone cut it. Fixing a radio that has never been opened is easy; fixing a radio that has had someone's hand in it before I get it is much tougher to fix. You never know what was done.

If a wire was cut you may want to check to make sure nothing else in the radio was modified. The problem may still be the radio's counter. Have you compared the actual output with the radio's frequency counter? If the counter follows the actual output you may want to double check to see if anything else is cut or modified.

Good luck and let me know if you ever get it on the mark.

[redlght]

Radio's counter and bench match readings still got the one number off deal from about mid way down if i set the lower half right the upper half is 1 number higher.

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Tuesday, 11 June 2013, 14:03 PM

Ok what Rick and i have been working on is the channel off by one deal so far this is what i found i have 2 rigs one is right on 1 to 40 the other is off by going from 1 to 40 test results i gleamed from both are as follows if you got any clues let me know.

on tp 1 on the good radio when i go through the band 1 to 40 the last 3 digits of the count stay close to the same:
GOOD RIG
CH1 34.76383 to .76384
CH40 35.20384 to .20385
Total diff of 2

Here they skew off by a good bit
BAD RIG that changes by 1
CH1 34.76507 to .76508
CH40 35.20520 to .20521
Total diff of 14

There is my trouble spot something when i change channels is really skewing the TP1 freq. The numbers I know are not right on for the alignment but they will suffice for this trouble shooting test.