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Author Topic: Bird Wattmeter/Dummy Load shorted shunt coil  (Read 1955 times)
K4JJL
Member

Posts: 498




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« Reply #15 on: October 30, 2006, 09:28:53 AM »

Response from Bird:

Good morning Jared,
Unfortunately this unit has been obsolete for a number of years. There are only a limited number of prints available and the print that shows the value of that shunt is no longer available.  I am sorry I am unable to help you with this.


I unsoldered and unwound the wire from the coil and measured its length.  I'm going to try to rewind a new one w/ the same size wire.

When I unwound it, I discovered that it was toasted inside, shorting several windings together.
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VE3ZXK
Member

Posts: 46




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« Reply #16 on: January 11, 2009, 10:18:48 AM »

Ok,

time to clear all the confusion boys,

I have the same meter, I am missing the shunt totally.

The TS-118A uses external precision thermocouples to measure power, between 5 and 500W, the shunt protects the transmitter, and with some engineering, the value of the coil can be learned. This is a simple project, as it lies outside the meter.
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VE3ZXK
Member

Posts: 46




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« Reply #17 on: January 18, 2009, 07:50:26 PM »

Ok,

I have built my own shunt, it is working now. I used a 4uH coil built into a very small enclosure. VSWR is good.
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AF7U
Member

Posts: 2


WWW

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« Reply #18 on: February 16, 2013, 03:49:29 PM »

Interesting... Bird, in their manual calls it a 'Thermocouple'...  Hmmmm...
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