Copper Talk » Ask The Tech » Radios BASE » Need some serious help, Wont transmit on all chanels « Previous Next »

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Jakethesnake
New member
Username: Jakethesnake

Post Number: 6
Registered: 10-2004
Posted on Thursday, February 15, 2007 - 3:25 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I have a galaxy Saturn that works fine except channel's 31-40 on the band below the regular cb channels. The radio keys and the output is fine but the frequency,once the radio is keyed up,changes fron the indicated freq to that of another channel, example trying to talk on lower 40 26.955 once the radio is keyed it is actually transmitting on 26.863. Can anyone help me since I talk to my family on 26.935 If you can explain it i can fix it Thanks Jake
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Kid_vicious
Senior Member
Username: Kid_vicious

Post Number: 2398
Registered: 9-2004


Posted on Saturday, February 17, 2007 - 11:35 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

jake,

which saturn do you have?
what board is in it?
any history you can give me to help me get started?
like when this started happening, and what was the last thing done to the radio prior to that?

knowing that you have the equip., you have done an alignment right?
did everything seem normal with the alignment?

details are good, i hope i can help.
matt
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Crappie
Junior Member
Username: Crappie

Post Number: 12
Registered: 12-2001
Posted on Sunday, March 11, 2007 - 4:53 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Jake,
I had a similar problem in a galaxy radio. The problem was a leaky diode in the array of diodes that control the Pll adder chips. (D100 was shorted) Sounds like your case could involve a different one, but you might replace them until you find which one. There are approx 6 to 10 of them all located together in an array.
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2600
Advanced Member
Username: 2600

Post Number: 587
Registered: 7-2002


Posted on Sunday, March 25, 2007 - 3:13 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Sure, I've seen the leaky-diode problem too. Not often, though. It's easy to 'bump' one of those diodes, and cause the bare lead on one to 'lean' against the diode next to it. If two adjacent bare leads touch, it could cause odd channel-selector trouble.

Bum channel selector.

Bum connection/solder joint coming out of the channel selector. Bum connection in one of the single-row pin sockets that connect the wire bundles that run between circuit boards.

Bad 4008 adder chips. Has two of them between the PLL chip and the front edge of the main pc board.

The MC145106 PLL chip is ALMOST never the reason for this.

73

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