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  1. 2FB327

    Help with a philly pc76xl

    I was given this radio and have no history. It looks to be a virgin, limiter intact, wax on cans, no spread coils. On RX, when hooked to the generator and set on channel 19, the tone is audible on 18 and weak on 17. On TX, it has carrier and mod from channel 1 thru 17 then nothing. What would be...
  2. 2FB327

    How to unhack a General Lee HP40

    That's right, how to unhack a nice radio. It has the Ranger 360015c board in it, I searched cb tricks and found some similar ranger boards and set the bias down, the radio was so hot you couldn't touch it, and set the low and high powrer carrier down. On the scope the when you add modulation it...
  3. 2FB327

    Cobra 29 no modulation

    Next in the stack of radios from the unknown. Is a 1998 cobra 29 with a KEPL-255 board. The radio receives and it has a 5 watt carrier but no mod. I went thru with my FC and have the frequency from the mic pins to the so 239 but no mod with good known mic's. If I touch pin 4 of the audio chip I...
  4. 2FB327

    tube hackers

    The newest thing for people who don't have a life, is to hack and eliminate account on the $tube. Three accounts with thousands of subscribers and hundreds of videos gone this morning. The tube was contacted and awaiting a reply. It may have been done thru FB.
  5. 2FB327

    3600 board mod

    I pulled off the cover and this is what I found, does anybody have an idea what this person was trying to do? He took the time to put hear shrink on it and never heated it.
  6. 2FB327

    Info on the EPT 360015C board

    I am trying to unhack a General HP40 ando it has the 360015C Ranger board, does anyone know of a radio that used the same board that I can get the alignment info from on CB tricks or elsewhere? Second what is the part number for TR32 that they insist on cutting out?
  7. 2FB327

    Radio Repair/Cobra 29LTD/ dead radio

    As I am working my way thru a stack of donated radios, I have a 29 LTD with the KEPC 060G board. Here is a link to some help I found from The Radio Shop, I'm referring to post #10. The whole post is great for someone that has an interest in repair. http://gokarters.com/smf/index.php?topic=2330.0...
  8. 2FB327

    Lou Franklin's test mic

    I'm trying to make a test mic using a coffin style 4 pin cobra as per Lou's book, understanding and repairing cb radios (page 9). It states: A test mic with clip leads is very handy. Take a good mic and remove the plug. Jumper the audio line across the PTT switch so it's always hot. Cut off the...
  9. 2FB327

    Percentage of modulation

    Another tuning question: In the factory manual for the cobra 29 ltd it states when tuning transmitter: TX mode/ 80% modulation My question is, I am using an audio generator to send the 1 kHz tone to the mic jack. How do you reduce the percentage of modulation?
  10. 2FB327

    Why cut resistors?

    I'm starting to go thru my box of donated radios and i'm still in the process of teaching myself repair. Could someone explain to me why on a Cobra 29's they cut out R53, R54?
  11. 2FB327

    RX Alignment setup

    Step 2 says AF VTVM? Where does it go in your bench setup and what do you use? A photo would be helpful.
  12. 2FB327

    HP 8656B signal generator cable

    I finally found a brand new old stock 8656B, my question is I need a cable to go from the RF output to the radio. The connector on the back of the unit looks like a 4240-062 N style connector, the manual calls for a 50 ohm type N male (us mil-c-39012). Is there a premade cable that has this...
  13. 2FB327

    Testing signal generator ouput

    I have a leader LAG audio generator, how do I go about checking it's output? When I inject the tone into the mic jack, it is there you can hear it and see it on the scope, and when I change the dial the tone changes, but how do I go about checking to see if the 1kHZ tone is in fact at 1kHZ. I...
  14. 2FB327

    Recomendations for a spectrum analyser

    Could some one recommend something that will do the job without overkill, yes I know the importance of calibrated equipment. Thanks
  15. 2FB327

    B&K 2040

    In my quest to learn radio repair and my frugal habits of refusing to pay a fortune for a signal tracer on the bay that may not work. I was looking thru the manual for my 2040 signal generator and noticed that you can inject a 455kHZ tone. Has anyone here used this method for trouble shooting...
  16. 2FB327

    Trouble shooting help

    Many thanks to Radio Tech and others with their help. I'm looking to learn more on the subject of troubleshooting the audio chain. Their post have help me bring a couple of cobras back to life that had no receive. Now I'm stuck on a couple (cobra 25's) with no carrier no modulation. The radio...
  17. 2FB327

    Another scope question

    I found an old post here on building a RF probe or RF meter. How do I go about setting up a scope to test a defective circuit and trace RF? Will I need anything besides the probe? Sorry for the simple question, but help me to understand this, Is the audio DC or AC? Should I be using the scope...
  18. 2FB327

    How to remove photos

    How do I clean out my old photos on my profile page?
  19. 2FB327

    Hooking a mp4 player/recorder to the PA Jack

    Could someone point me to the instructions on how you go about this. With all the bashing of incompetent hackers maybe someone could show me the right way to do it. We need more teachers.
  20. 2FB327

    Changing The Intensity Of The Channel Display

    Does anyone know what resistor will change the intensity of the channel display on bright on a Cobra 29LTD? I found some info on the black and chrome for changing the intensity of the meter light and channel display, but it is different on the LTD. I pulled R115, R116 and R117. After pulling...