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572B input impedance?

FL2100B Linear Amp was found to have a high input VSWR between 2-3:1 on 20, 15 & 10M bands.
With RF drive straight thru via Bird Thruline to 50 ohm dummy load I found VSWR was excellent at 1:1.
On inspecting the RF path taken (with key down with 800vac disconnected) via band switch and AMP tuning Pi network it was found to have a high VSWR on 14, 21 & 28MHz bands. Tuning those bands on input to Amp did little to achieve a low VSWR !!
Any suggestions would be appreciated to achieve a lower VSWR.
73s
 
Check bandswitch. Amazing how those cook when driven with a trashy radio. Could be bad cap, but with all of them reading high. I’m betting on harmonics arced bandswitch. Seen it many times
 
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  • @ BJ radionut:
    +1
  • @ heartbreaker3473:
    Hello gentlemen and Ladies. I have the dreaded RCI-2990 receive issue where my radio gets distorted when people get close to my location. I found the C90 Capacitor, but I can not for the life of me find the C89 capacitor. Can or does anyone have a picture of the exact location of C89 ? Thank you in advance, Wes
  • @ AudioShockwav:
    Wes, it's better if you start a thread on the main forum, more people are going to see your question.
  • @ heartbreaker3473:
    Okay, sorry, will put in a forum
  • @ heartbreaker3473:
    I put it in the general disscution help area and started a new thread. Thank you for letting me know.


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