YAESU FL-2100B - Bias

Discussion in 'Amateur Radio Amplifiers' started by F8BDX, Nov 29, 2017.

ad: L-HROutlet
ad: l-rl
ad: Subscribe
ad: MessiPaoloni-1
ad: Left-2
ad: L-MFJ
ad: Left-3
  1. KA9JLM

    KA9JLM Ham Member QRZ Page

    You should not need 100 watts to drive that amp for rated tube dissipation.

    That amp is rated for input power not output power.

    "Power input is 1200 watts PEP SSB, 800 watts CW (50% duty cycle) and 600 watts on AM/RTTY."

    You need a bigger/better amp to meet your expectations. ;)

    Have Fun.
     
    Last edited: Dec 1, 2017
  2. G3YRO

    G3YRO Ham Member QRZ Page

    Yes you do !

    These Amps always need 100 watts of drive to give full input/output.

    And 1200 watts DC input gives you 600 watts RF output.

    They will also happily run that power on cw too.

    Roger G3YRO
     
  3. KA9JLM

    KA9JLM Ham Member QRZ Page

    So the specification are wrong ?
     
  4. G3YRO

    G3YRO Ham Member QRZ Page

    No, it clearly says in the handbook that you need 100 watts of drive for full power.

    Roger G3YRO
     
  5. F8BDX

    F8BDX Ham Member QRZ Page

    Hello
    I would like to know why the Bias is at 50 mA on the Compeur.
    a problem on the small circuit below or there is a small relay 12V?
    on this circuit I measured 2.65V between the BIAS Pin and the mass
    in RX and TX.

    TNX
    Jose
     
  6. G3YRO

    G3YRO Ham Member QRZ Page

    I'm sorry Jose, but your English is not really making sense !

    Your standing current at 50mA is a little low . . . but I wouldn't worry sabout it.

    Roger G3YRO
     
  7. F8BDX

    F8BDX Ham Member QRZ Page

    sorry for the translator
    73 and TNX
     
  8. F8BDX

    F8BDX Ham Member QRZ Page

    Good Morning
    I'm sorry
    the permanent current does not change when you move the valve to the bias resistor
    TNX
    Jose
     
  9. G3YRO

    G3YRO Ham Member QRZ Page

    Are you saying that you have moved the clamp on the big green Bias Resistor, and the standing current has not changed?

    I have never found it necessary to adjust that resistor on these Amps . . . if the Standing Current is wrong, it usually means you have a faulty Valve.

    I would try turning the Amp on with one Valve Removed . . . and then the other one. See what the Standing Current is in each case.

    Roger G3YRO
     

Share This Page