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#1
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"Richard Clark" wrote in message ... On 14 Sep 2003 12:35:05 -0700, (Art Unwin KB9MZ) wrote: I have never seen a reason to spend big money on a Bird wattmeter but I do have a question. What exactly is inside the various slugs that one must use with this meter ? Art Hi Art, A loop, at least one cap, a diode, at least one resistor. 73's Richard Clark, KB7QHC The little network, along with the section of coax line inside the main housing, forms a directional coupler. A Bird 43 (or similar, but the 43's are readily available, used, on eBay) is about the cheapest way to get answers about the design and performance of your antenna and transmitter system. And if you think a Bird 43 is big money, you ain't seen nothing yet! Ed WB6WSN |
#2
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On Sun, 14 Sep 2003 14:31:08 -0700, "Ed Price"
wrote: The little network, along with the section of coax line inside the main housing, forms a directional coupler. A Bird 43 (or similar, but the 43's are readily available, used, on eBay) is about the cheapest way to get answers about the design and performance of your antenna and transmitter system. And if you think a Bird 43 is big money, you ain't seen nothing yet! Ed WB6WSN Hi Ed, I am quite familiar with the Bird 43. A useful instrument on the bench, more appropriate in the field. The URM-120 by Sierra is far more robust and always keeps its calibration. I have used instrumentation that is far more expensive and I have used instrumentation that was far cheaper. I have calibrated them all. For the amateur, a cheap Radio Shack CB SWR meter is more than adequate, and if it is not perceived to be, is easily tailored to fill that shortfall of perception. It shouldn't cost anyone more than $20 (mostly for the meter) to build a very good one. There are scads of designs available, and all revolve around the same assembly of simple components I described for Art. If any trick is involved, it is close attention to dimension and wavelength. Choice in SWR meters is almost akin to preference in tie color, a personal matter. 73's Richard Clark, KB7QHC |
#3
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"Richard Clark" wrote in message ... On Sun, 14 Sep 2003 14:31:08 -0700, "Ed Price" wrote: The little network, along with the section of coax line inside the main housing, forms a directional coupler. A Bird 43 (or similar, but the 43's are readily available, used, on eBay) is about the cheapest way to get answers about the design and performance of your antenna and transmitter system. And if you think a Bird 43 is big money, you ain't seen nothing yet! Ed WB6WSN .. 73's Richard Clark, KB7QHC Bu, bu, bu, Richard it has to be expensive for a CBer. How else is he to get them "bird" watts thar? (snicker) Jerry |
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