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Recent content by Derrick Walls

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    Galaxy dx44v problem

    tr49 was the culprit. Thanks for the info. I appreciate it
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    Galaxy dx44v problem

    I've got a galaxy dx44v on the bench and I've hit a wall. I'm getting receive audio through the radio but cannot get tx audio through it. I've traced it back to C191 on the board and seem to lose it after that. Another thing I have noticed on the voltage of tr51 the middle leg of the transistor...
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    Cobra 29 No TX Output

    I've been looking for a replacement for the erf7530 transistor. Seems they are getting hard to find since palomar changed hands.
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    Cobra 29 No TX Output

    yep that was it. the bias component was shorted to ground. got it fixed. The rfx85hd is shot. the transistor is gone in it. radio works fine without it. Is there a feasible replacement for a on board amp?
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    Cobra 29 No TX Output

    Ok my problem is there I have no voltage on the gate of the final.
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    Cobra 29 No TX Output

    Correct me if I'm wrong shouldn't the final have some gate voltage to turn on the mosfet so it would amplify the signal. At this point it has none when keyed
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    Cobra 29 No TX Output

    Sorry I was a bit tired last night. It does have a mosfet final but has all the parts install and removed for it. Reason I put a mosfet final in originally was because the customer wanted a rfx85 amp added to the radio and was using it to drive the amp. Radio is the 29LX been working great for...
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    Cobra 29 No TX Output

    ok found part of the problem. had a bad driver. just low output now. Radio has a mosfet installed on the final. getting little less than half watt deadkey with a swing up to 2 watts.
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    Cobra 29 No TX Output

    d8 diode checks good also getting 13.8 voltage to the collector of the final and driver. I put two new transistors in. still no output. Note: I have a oscope, multimeter and a bench freq counter. Not as familiar with the Cobra radios as i should be because I rarely work on them
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    Cobra 29 No TX Output

    Ok I'll give it a try and let you know how we turn out.
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    Cobra 29 No TX Output

    I have a Cobra 29 on the bench I'm having a little trouble nailing down the problem on. I'm getting a good signal to the base of the driver but not to the final. The signal on the collector of the driver less than half of the signal on the base. For instance on 19 when keyed the signal on the...
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    Cobra 29ltd 10khz off frequency

    I generally only ask if I've been in it a day or so and haven't found my problem
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    Cobra 29ltd 10khz off frequency

    Found my problem. Bad solder joint on one of the vco cans
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    Cobra 29ltd 10khz off frequency

    Checked that out. Had no luck there. Just figured it was a common problem getting off one channel
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    Cobra 29ltd 10khz off frequency

    Got a cobra 29ltd that is 10khz off frequency. Example on channel 19 the frequency counter shows 27.195.