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(Yet) another amplifier myth

Discussion in 'Amateur Radio Amplifiers' started by K4HYJ, Dec 17, 2013.

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  1. K4HYJ

    K4HYJ Premium Subscriber QRZ Page

    I heard this on 80 meters this past weekend - guys who were griping about the 10 meter contest. I was dialing down to get on a net when I heard these fellas talking. Someone had ask a question about 10 meters and they went off. Then the guy ask about amplifiers - he had a Dentron something or other and complained about perceived losses when listening after the amp had been put in line. One of the gripers told him that unless the amp's band select switch was set to the band he was using, there would be losses due to a tuning mismatch.

    I am no electronics guru, but every amp I've owned when used in standby or turned off, the input and output connectors are basically wired together the way I read their schematics.

    I tried to jump in but no one could hear me - I guess I had my band switch on 20 meters :p
  2. WB2WIK

    WB2WIK Platinum Subscriber Platinum Subscriber QRZ Page

    If I hear stuff like this I try to jump in for a moment if I have the time, just to confirm everything they said and add more stuff, like, "Oh, yeah, that certainly happens but also be careful you measure your line voltage carefully. The amp is probably set for 240V, and you don't want to use 230 or 250 or anything, as that can detune the internal line voltage preselector which will kill your receiver sensitivity big time. Also, dust on the fan blades reduce sensitivity by 1uV per .001" or so, based on careful observations made at the University of Silly Walks."
  3. KV6O

    KV6O Ham Member QRZ Page

    And if your transformer windings aren't wound with oxygen free copper, those O2 molecules migrate to your switches and oxidize the contacts, further degrading receiver performance. Can't be too careful.

  4. KB5UBI

    KB5UBI Ham Member QRZ Page

    Just remember, these people also vote.
  5. K4HYJ

    K4HYJ Premium Subscriber QRZ Page

    I know why you can sell blinker fluid to some folks now!
  6. KJ3N

    KJ3N Ham Member QRZ Page

  7. AF6LJ

    AF6LJ Ham Member QRZ Page

    Don't forget you must use six foot jumpers between the amplifier and your radio.
  8. K9ASE

    K9ASE XML Subscriber QRZ Page

    and get them to rotate their spark plugs:eek:
  9. W7MMQ

    W7MMQ Ham Member QRZ Page

    Griping about the 10M contest on 75 huh. There was plenty of room above 28.750 a lot of room. Apparently they don't have VFO's
  10. KJ3N

    KJ3N Ham Member QRZ Page

    Nor do they have clues....
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