Question about Magnum DeltaForce CB Radio

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I have an old K40 radio and K40 processor mic and cannot find the wiring for the mic.

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K40 mic wiring Code:
Pin1 Audio-White
Pin2 Shield
Pin3 Receive-Black
Pin4 Transmit-Red

Posted on Jan 30, 2010

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Have you checked out cbtricks.com

Posted on Nov 21, 2009

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1 Answer

I have a k40-7 CB radio lights work but no receive or transmitt. Just a low hiss when powered on that gets louder when I key the mic. I don't have the stock mic could this be the problem?


yes , It sounds like an internal problem.take it to a tech or send it back.They will probably ask you to describe what its doing .

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Is this new mic wired for your radio? just because it fits the socket doesnt mean its right. Did the old mic do the same thing reason why you got the new one? just sounds more like a loose wire at the jack where the mic plugs in? has that connector ever been loose or needed tightened at any time?

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Your radio shouldn't be keying on it's own no matter where your SWR's are at. I would start simple by checking your mic plug, then inside the mic for cold solder joints, or shorts. Do this after you borrow a compatible mic and try the key-up. Just don't key very long before you get your standing wave ratio in check. I'm talking like 1 second.

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Magnum 257 No Audio Being Transmitted


Hello.I have a similar situation on a Magnum 257 HP operating on SSB (AM and FM works fine). If i Transmit it works fine, but when i release the Mic button (after TX), in the bottom side were the RX level should be, it appear somth like a signal level 3 to 5 (constant and continous), but i can't get any reception at all. Only if i turn the TX power level to MAXand i transmit, then it goes back to reception, but not every time. Somtime after TX i need to push the mic button 2-3 times to make it recive somthing, but this wors only if the power level is over 60-70% an i repeat, only on SSB.Can i get some help with this issue?

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1 Answer

Wiring a mic


The Delta Force and Omega Force are wired the same way, so if the mic is not working on the radio, check the mic out to make sure it's working. Make sure you have the mic gain turned up on the radio. I assume the mic was not wired for another style of radio??

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Uniden pc 78 elite cb


Hi, This is a link to your old post re SWR 3....http://www.fixya.com/support/t180697-pc78_elite_cb As stated SWR 3 is too high, it should be 1.5 or lower. Fiberglass antenna are kinda notorious in setup and experience wise have not performed well or at all. Maybe you should try a different antenna (metal rod). Some good brands/models I have tried with very good results are K40, Hokushin, Comet, Oscar, Maldol, Daiwa. To check if you can receive, stick an ordinay length of wire ('bout 9' long) at the center of your radio's connector. RX should work (pls don't key the mic or TX).

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