Dave wrote:
but there will be a reflection at the 50 ohm to 75 ohm transition on the
load side of the meter.

It was previously reported that the path through the Bird
is 40mm. The path through the Bird is actually about five
inches which is probably long enough to establish a 50 ohm
environment.
--
73, Cecil, http://www.qsl.net/w5dxp

On Fri, 14 Oct 2005 16:22:39 GMT, Cecil Moore wrote:


It was previously reported that the path through the Bird
is 40mm. The path through the Bird is actually about five

Cecil,

If you are referring to my statement in another thread, it was that
the sampling element is about 40mm inside the 50 ohm Thruline section
(ie that there is about 40mm of 50 ohm transmission line between the
Bird 43 terminals and the sampling element), not as you have stated
above.

Owen
--

Owen Duffy wrote:

On Fri, 14 Oct 2005 16:22:39 GMT, Cecil Moore wrote:
It was previously reported that the path through the Bird
is 40mm. The path through the Bird is actually about five

If you are referring to my statement in another thread, it was that
the sampling element is about 40mm inside the 50 ohm Thruline section
(ie that there is about 40mm of 50 ohm transmission line between the
Bird 43 terminals and the sampling element), not as you have stated
above.

I'm sorry, Owen, I took your statement to mean that the total length
of path through the Bird is 40mm (1.5") which is not enough length
to force a 50 ohm environment. I downloaded the Bird manual this
morning and discovered that, unlike an MFJ, the path through the Bird
is about 5 inches and coaxial. I apologize to Bird and you Bird
experts for that bad assumption.
--
73, Cecil http://www.qsl.net/w5dxp

That explains why my new tuner failed to work. I have a rotary switch that
selects 40mm of 50, 75,300, 450, and 600 ohm coax. I thought it should match
anything! Now I see I have to go to 5" lengths. I should know better than to
build anything before all the errata sheets are in.

I can use some additional diversion as almost all the soldering iron burns
have healed.

"Cecil Moore" wrote in message
m...
Owen Duffy wrote:

On Fri, 14 Oct 2005 16:22:39 GMT, Cecil Moore wrote:
It was previously reported that the path through the Bird
is 40mm. The path through the Bird is actually about five

If you are referring to my statement in another thread, it was that
the sampling element is about 40mm inside the 50 ohm Thruline section
(ie that there is about 40mm of 50 ohm transmission line between the
Bird 43 terminals and the sampling element), not as you have stated
above.

I'm sorry, Owen, I took your statement to mean that the total length
of path through the Bird is 40mm (1.5") which is not enough length
to force a 50 ohm environment. I downloaded the Bird manual this
morning and discovered that, unlike an MFJ, the path through the Bird
is about 5 inches and coaxial. I apologize to Bird and you Bird
experts for that bad assumption.
--
73, Cecil http://www.qsl.net/w5dxp