Some RF contacts and power transmission lines
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Transcript of Some RF contacts and power transmission lines
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Some RF contactsand
power transmission lines
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Annual maintenance of RF power transmission lines in BA3 Philips plant
Once per year, we have to dismount 16 RF power amplifiers to make their maintenance
To do so, we need to disconnect their output power transmission lines
With this 35 years old equipment, we recently experienced some difficulties with the innerspring contact clamps
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Innerspring contact clamp
Innerspring contact clamp ensures continuityof the inner line of the 35 kW CW RF transmission line
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Possible mistakes
As it was too difficult to insert it in the inner line, mechanist decided to
shorten the RF spring contact
See next slide for consequences…
Too long springImpossible to mount inside
the inner line
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Bad RF contact consequencesOriginal clamp size
After operation at 35 kW @ 200 MHz with bad contacts Even worse
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Correct procedureCompress the spring to the selected length
Once compressed cut it guarantying the correct number of spirals
Roll it up ensuring a good spirals distribution including
the connecting point
A very simple process to ensure a correct contact
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Additional examples…Wrong lamella angle : burnt contacts
Another clamp burnt because one of the finger contact was mistakenly inserted in the
inner side instead of the outer side