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Author Topic: Dare I ask, Who does CB alignment  (Read 1456 times)
MDNITERDER
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Posts: 146




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« on: March 14, 2012, 12:16:05 PM »

I have an older 148 GTL Love it to death, Someone a while back said I was a few kcs off freq and I would like to have someone go over it make sure everything is in perfect working order. It has never had any channel expansion done to it and I never plan on it, I just wish to make sure its in full specs.

 Anyone capable of doing this or know of a shop i can send it to?
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W5FYI
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Posts: 1045




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« Reply #1 on: March 14, 2012, 12:46:48 PM »

Crystal aging could be causing the problem, but a few kc's is a lot!

Depending on where you live, a local truck stop might host a competent CB repair shop. But before using it, I would ask several truckers for their impressions and ratings on the work done there. Then keep your fingers crossed.
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N4NYY
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Posts: 4758




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« Reply #2 on: March 14, 2012, 03:03:55 PM »

I do them for locals. If they are hacked, I refuse them.

Basically, you need to verify the PLL freq is 10.240 MHz. I have seen them way off. There is no adjustment. You replace the crystal until it is on freq. I have scrap crystals for that purpose.

After that, you essentially follow the alignment instruction. 90% of it is tuning the radio for maximum sensitivity at channel 10 or 20, which a VTVM over the speaker terminals. There are usually a sequence of slugs for that. I do not bother with the transmitter as most of that alignment is power out, modulation adjust, carrier null. Typically, the modulation is what needs to be adjusted.
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MDNITERDER
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Posts: 146




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« Reply #3 on: March 14, 2012, 03:49:46 PM »

I have no equipment to do so, and I have no way to verify what this person says is true, this person could easily say this, no one else complained, I have had a few say they needed to adjust the clarifier and that's about it. Its not hacked I just wanna make sure everything is in working order,

 How much would you charge if I shipped it.
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N4NYY
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Posts: 4758




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« Reply #4 on: March 14, 2012, 05:00:17 PM »

I don't do it for money or a business. Not worth it. I would try and find a shop online. Bob's CB is one. He is pretty knowledgeable.
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KE4DRN
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Posts: 3722




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« Reply #5 on: March 14, 2012, 05:35:39 PM »

hi,

nothing wrong with asking for help to repair or adjust
any radio that you are using in a lawful way.

Marine, CB, aviation and amateur equipment no difference,
they are all radios.

regards,

james
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KE3WD
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Posts: 5689




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« Reply #6 on: March 14, 2012, 05:39:46 PM »

Sounds like you were told this when in SSB mode. 

Unlocked clarifier?  If so, the detent on the knob is not likely to be center. 



73
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N4NYY
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Posts: 4758




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« Reply #7 on: March 14, 2012, 07:04:23 PM »

Quote
Sounds like you were told this when in SSB mode.

Unlocked clarifier?  If so, the detent on the knob is not likely to be center.

If that is the case and it is locked, he is better off unlocking it.  I never understood why the FCC made locking the clarifier a rule, as it would make a 3 person QSO impossible. The drift and inaccuracy of CBs call for an unlocked clarifier more than expensive ham rigs. They just are not that accurate.
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WA3SKN
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Posts: 5480




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« Reply #8 on: March 16, 2012, 12:10:37 PM »

Anyone with a General Radiotelephone license is authorized to do the work.
However, just checking the frequency should be easy enough with any recent HF radio... you are talking AM carrier frequency, right?  You can measure that after checking the HF rig to the WWV standard.
If it is off frequency, then get it fixed.
73s.

-Mike.
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