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  1. HARDROCK

    Best Moblie Antenna for OTR Truck

    I am having my awm-30 true peak reading meter Calibrated by W8JI Tom. He is still the best in the Consultant Engineering Business.. Too bad we ran him off. He dont have time for forums or Arguing. He is the best Rf amplifier designer in the Country, Tony 73
  2. HARDROCK

    RM Italy Amp harmonics to 11th Harmonic at 2 watts input!

    Very True Easy-to-Drive Linear Amplifiers Some hobbyists and manufacturers tout "very low drive" as an advantage, claiming it offers "cleaner signals". Nothing is further from the truth. Exciters almost always provide the best IM performance when operated at a time-averaged peak power a...
  3. HARDROCK

    Why you need a low pass filter when using a splatter box amplifier

    Yes it is Flawed . I specifically ask Mike why he did not check the kl7405v I sent him with the Pearce simpson radio .. I sent the kl7405v that has regulated ab bias along with the pearce simpson radio so he could match the radio up to the amp. Which he did as I ask. The kl 7405v has 2...
  4. HARDROCK

    Why you need a low pass filter when using a splatter box amplifier

    I am with Tom w8ji below why would a low pass filter be needed ? 8JI Ham Member QRZ Page G0HZU said: ↑ A good quality lowpass filter would be a useful thing to fit just before your inline power meter assuming you are using a typical Ham power meter. By Ham power meter I mean anything from...
  5. HARDROCK

    send me a email please. Thanks

    send me a email please. Thanks
  6. HARDROCK

    Cobra 29ltd recieve alignment

    Video of my 1991 cobra 29 ltd philly aligned properly. No Hocus pocus !! :)
  7. HARDROCK

    Best Moblie Antenna for OTR Truck

    Efficiency It is naturally important to ensure that the proportion of the power dissipated in the loss resistance is as low as possible, leaving the highest proportion to be dissipated in the radiation resistance as a radiated signal. The proportion of the power dissipated in the radiation...
  8. HARDROCK

    Mobile Export Reviews Please

    The Cobra 29 ltd has the best recieve , actually better than the exports. I have 4 made in the phillipines , of course there AM only, but Rock solid. Typical values for each radio: Adjacent channel rejection : Export 50db 29LTD 60db Image rejection: 50db 80db Selectivity...
  9. HARDROCK

    FINE TUNE CB SHOP FOR REAL?

    Can now read a free text book on line. https://www.circuitlab.com/textbook/ It's currently under development but the first few chapters are complete and looks like a pretty good reference.
  10. HARDROCK

    FINE TUNE CB SHOP FOR REAL?

    Thanks This is good info. equilazation is most important.
  11. HARDROCK

    FINE TUNE CB SHOP FOR REAL?

    Lol... you make a good point. It did not have that sound on the ts-50 on AM its low level modulation. I can relate to what you are saying , most of the guys on 80 meters have the same problem too much compression and the highs is like fingernails on a chalkboard:eek::eek: I think it...
  12. HARDROCK

    FINE TUNE CB SHOP FOR REAL?

    http://onairdesigns.us/ My question is will the cobra 29 sound better with the heil hc-4 mic opossed to the stock cobra mic , by using the adapter box in the link above ? Forget the mixing/ equalizing.
  13. HARDROCK

    FINE TUNE CB SHOP FOR REAL?

    Yes. Not worth the effort. http://www.dk3hv.com/SSB-Audio/Heil/heil.html Listen to the 2 elements. http://onairdesigns.us/ This would work.. Do you think it would sound ok without any equilazation or mixing ?
  14. HARDROCK

    FINE TUNE CB SHOP FOR REAL?

    Thanks , Bob emailed me back, the unit will have equilization also. He said probably by the end of the year. I like the hc-4 he made when i had it on the ts-50 kenwood. Is there a way to run the hc-4 on the cobra 29 ? My understanding is it will not work.
  15. HARDROCK

    FINE TUNE CB SHOP FOR REAL?

    RPC, this is a email i sent heil about his mics on the cb. His end quote i hope will come to pass so we could use them on the cb. Hi Tony DOn’t have any thoughts on this. Hand microphones are always pretty terrible. The other situation is the the CB transmitters do not have good audio to...
  16. HARDROCK

    How to perform the 2sc2999 and Schottky diode swap

    http://www.k0bg.com/signal.html
  17. HARDROCK

    Low AM Modulation On President P300

    I had a p 300 years ago a cb tech either changed the voltage regulator out or put a bigger audio transformer in it. The radio came alive it had killer audio. Sorry i cant remember. Good Luck
  18. HARDROCK

    How to perform the 2sc2999 and Schottky diode swap

    Does anyone Know how to contact GOHZU ? I know this thread has been dead a while. He seemed to up to snuff on recieve alignments. I would like to know if Sinad is the best for aligning the cb for recieve. As far as s/n ratio. I know Sinad is used for FM but have been told not for AM...
  19. HARDROCK

    FINE TUNE CB SHOP FOR REAL?

    Thanks. I like the old coffin style cobra stock mics The audio clip is of a stock 29 with this mic. It may have a hillbilly sound ...after all i am from Ga. Lol :)