FM xmiiter problem before I call the real engineer
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FM xmiiter problem before I call the real engineer
And not too many of them left - and he's about 200 miles away. So here is the problem---- I have a Wilkinson 2500E, 83 vintage. It was rebuilt 1 year ago (everything new, really, except the box) - we pulled the IPA and exciter - and from other folks I've talked with they say the exciter was shit, but the everything else, ok. The rep from Wilkinson must have spent alot of time in north central/west Texas because about 10 stations have Wilkinson xmiitters. I need 60 watts of drive and I'm doing it with a DB 500. Now the problem --- the exciter output will not stay stable --- and it started about a months ago. It wil go from 10 watts to 80 watts almost everyday now. And at 60 watts --- plate current, screen volts/current -- everything right where it should be.
Any ideas?
Mark
Any ideas?
Mark
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Re: FM xmiiter problem before I call the real engineer
what are these readings when the output drops? what is the vswr into the amplifier? when normal and when the power drops?? could be cableing to the amplifier or the input circuit of the amplifier? what about heat in the transmitter building.
REV. ED
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Re: FM xmiiter problem before I call the real engineer
As oldtvman stated, If the power is reducing I would look at vswr into the IPA or heat. If the power is going up, I would guess some type of problem exists in the control circuit. You really need to look at the schematic to see how the power output is controlled. I've never worked with a DB500. Does it have a multi-test meter? Check there first. Good luck.
- lastone
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Re: FM xmiiter problem before I call the real engineer
You may simply have a bad output control. Turn the power out control SLOWLY down and up. Watch for any Jumps. See if it 'wiggles' (gently) and jumps at various locations of its range. If the control is carbon, I'd almost bet it's loosing contact.
Just a thought.
Just a thought.
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WRSG Knights 91.5 Middlebourne-Sistersville, WV 5 PM Eastern Wednesdays (Repeats 7 AM Thursdays).
106.3 The Double Q, Farmington, Iowa, 10-11 AM Central time, Wednesdays.
Buckeye Broadcasting, Cambridge, Ohio, 10 AM Eastern time Friday and other days on Live 365.com
WBPS 101.9, Cambridge, Ohio
KZBZ 92.1, Williams, Arizona, Sundays.
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Re: FM xmiiter problem before I call the real engineer
...too electrocuted and dead to respond.
Did we mention pulling the disconnect and using the wand-of-our-savior before troubleshooting inside the cabinet?
oops
Did we mention pulling the disconnect and using the wand-of-our-savior before troubleshooting inside the cabinet?
oops
Last edited by Cameron on Fri Aug 07, 2009 9:42 pm, edited 1 time in total.
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Cameron Smith - CSRE®
Senior Member - SBE 68 Birmingham
Senior Digital Product Manager - Hibbett Sports|City Gear
Cameron Smith - CSRE®
Senior Member - SBE 68 Birmingham
Senior Digital Product Manager - Hibbett Sports|City Gear
- genlock
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Re: FM xmiiter problem before I call the real engineer
Important and sometimes forgotten professional safety tip.Cameron wrote:...to electrocuted and dead to respond.
Did we mention pulling the disconnect and using the wand-of-our-savior before troubleshooting inside the cabinet?
oops
"Everyone Should be aware that you're just a screen grab away from infamy."
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Re: FM xmiiter problem before I call the real engineer
eh...I'm still kickin'.
See you at hamfest tomorrow.
See you at hamfest tomorrow.
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Cameron Smith - CSRE®
Senior Member - SBE 68 Birmingham
Senior Digital Product Manager - Hibbett Sports|City Gear
Cameron Smith - CSRE®
Senior Member - SBE 68 Birmingham
Senior Digital Product Manager - Hibbett Sports|City Gear
- genlock
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Re: FM xmiiter problem before I call the real engineer
I will be there.
"Everyone Should be aware that you're just a screen grab away from infamy."
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Re: FM xmiiter problem before I call the real engineer
Good. You can boo me after my Extra Class.
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Cameron Smith - CSRE®
Senior Member - SBE 68 Birmingham
Senior Digital Product Manager - Hibbett Sports|City Gear
Cameron Smith - CSRE®
Senior Member - SBE 68 Birmingham
Senior Digital Product Manager - Hibbett Sports|City Gear
- genlock
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Re: FM xmiiter problem before I call the real engineer
Raquel going to get her license someday?
"Everyone Should be aware that you're just a screen grab away from infamy."